Second Year Physics Mcqs.pdf

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CHAPTER # 12 ELECTROSTATIC 1.

One coulomb is that unit of charge which when placed at 1m form an equal and similar charge repels it with a force 9

a) 5 X 10 dyn 9 c) 9 x 10 dyn 2.

12.

9

b) 1 state coulomb d) None

b) J = V x A d) J = C x V

-12

a) Big charges c) Point charges

-10

b) 4.8 x 10 d) None

15.

a) Electric flux b) Electric potential c) Electric intensity d) Electric current

b) Insulators d) S. conductors

Electric field intensity is also known as a) Electric potential c) Potential gradient

17. b) J.J. Thomson d) Einstein

b) Electric flux d) None

b) Blue d) Tonar

There are two charges 1 uc and 6 uc, the ratio of forces acting on them will be a) 1:25 c) 1:1

18.

b) 1:6 d) 6:1

b) Direction d) All of them

19.

If two charges are experiencing a force of 10 N, when medium is Air, if the medium is change whose permittivity is ‘2’ then force will be b) 5 N d) 0.3 N

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Depends on the path taken Greater then zero Equal to zero Negative

In the region where the electric field is zero, the electric potential is always a) Positive b) Negative c) Constant d) Zero

20. a) 3 N c) 10 N

The work done in moving a charge along an equipotential surface is a. b. c. d.

An electric field lines provides information about ________ a) Electric Force c) Medium

A basic technique when applying gauss’s law is to a. Assume the field is constant in direction b. Assume the field is constant is magnitude c. Assume the field is constant in both magnitude and direction d. Construct and imaginary surface about the charge

The ink used in the photocopy machine a) Black c) Red

10.

The force per unit charge is known as

The charge on the electron was calculated by a) Faraday c) Millikon

9.

b) Small charges d) Any charges

ergs

16.

8.

Coulomb’s law is only applicable for

Polarization of matter is possible only for a) Conductors c) Gases

7.

b) Heating d) By rubbing

One electron volt is a) 1.6 x 10 ergs c) 300 ergs

6.

b) Curved surface d) Closed surface

Objects may acquire an excess or deficiency of charge by a) Electric force c) Striking

14.

5.

Gauss’s law can be applied to a) Plane surface c) Any surface

13.

b) N/C 2 2 d) N /C

Which of the following is correct a) J = C/V c) J = V/A

4.

Unit of electric flux is a) V.m 2 c) V.m

b) 5 x 10 N 9 d) 9 x 10 N

The minimum charge on an abject is a) 1 coulomb -19 c) 1.6 x 10

3.

11.

The electric intensity is expressed in unit of N/C or a) Volts b) Walt c) Joules d) V/m

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The energy stored in the capacitor is 2

31.

2

a) ½ CV 2 c) ½ QV 22.

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6

b) ½ C V 2 d) ½ Q V

a) 10 ev 12 c) 10 ev

A charge of 0.01c accelerated through a p.d of 1000v acquires K-E a) 10 J c) 200 J

32.

If the charge on the particle is double then electric field is a) Half c) Unchanged

24.

6

2

5

6

c) 6 rv

Selenium is a conductor material which when exposed to ________ a) Light c) Mono chromatic light

2

b) 0 m -15 2 d) 10 m

37.

b) Dark d) None of these

When capacitors are connected in parallel the net capacitance will

b)

6 

d)

8 

a) Increase c) Constant 38.

A capacitor acts as blocking elements when applied signal is a) A.C c) Digital

b) D.C d) None

39.

b) Electro dynamics d) Electronics

The surface consider for gauss’s law is called a) Closed surface c) Gaussian surface

b) Spherical surface d) None

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b) 4:1 d) 1:2

S.I unit of permittivity of free space is a) Farad 2 2 c) c /N.m

40.

b) Decrease d) None

When two capacitors of same capacitance are connected in parallel and then in service, the capacitance in these two cases are in ratio of a) 1:4 c) 6:1

Inkjet printers works on the principle of a) Electrostatic c) Electro magnetism

30.

Electricity Cell Charging and discharging of capacitor None

The equation for the stokes law is a)

29.

36.

b) Dielectric d) Medium

The automobiles wind shield wipers works on a. b. c. d.

The area of plates of 1 farad capacitor separated 8.85mm placed in the air is 9

28.

35.

Size of plate Distance b/w plates Nature of dielectric b/w plates All of above

a) 10 m -9 2 c) 10 m 27.

6

b) 1.8 x 10 N/C 5 d) 1.8 x 10 V

b) J.J. Thomson d) None

The medium used b/w the plates of capacitor is called a) Polarization c) Insulators

Capacity of a capacitor depends upon a. b. c. d.

26.

34.

b) Masses d) Medium

Charge to mass ratio was firsts found by a) Millikon c) Newton

The electric potential at a point of distance 1 m from 2 uc charge is a) 1.8 x 10 V 4 c) 1.8 x 10 V

25.

b) Double d) None

9

b) 10 ev 15 d) 10 ev

Gravitational force does not depends on a) Force c) Distance

b) 100 J d) 400 eV 33.

23.

One giga electron volt

b) Weber 2 d) c /N.m

A capacitors may be considered as a device for a. b. c. d.

Storing energy Increasing resistance Decreasing resistance None

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If a 10MF and 2000MF capacitors are connected in parallel the net capacitance will be a) 6.7 uF c) 2010 uF

42.

45.

Large CR (Time constant) value has

One joule per coulomb One dyne per coulomb One Newton per coulomb One watt per second

-5

a. 2.5 × 10 C -5 c. 2.4 × 10 C

A dielectric An equipotential surface Polarized None

a. Neutron c.  – rays 54. The relative permittivity a. 16 c. 18

The electric flux through the surface of hollow sphere containing a point charge at its center depends upon

55.

Xerography means

a. 2 × 10 m/sec 6 c. 5 × 10 m/sec 57.

48.

b) 4 N d) 0 N

A line whose tangent at each point is in the direction of electric intensity at that point is called a line of a) Voltage c) Charge

 r for germanium is

b. Wet writing d. None of these

56. A 25eV electron has a speed of

A charge of 2c is in a field of intensity 2N/C, the force on the charge is a) 1 N c) 4  N

b. x – rays d. α – rays

b. 17 d. 22

a. Type writing c. Dry writing

Radius of sphere Surface area Magnitude of charge None of these

-6

b. 2.4 × 10 C -6 d. 2.4 × 10 C

53. An electric field can deflect

6

47.



52. A Capacitor of 2μF is connected with a battery of 12 Volts, the charge stored in capacitor

If the potential difference on a surface is equal to zero b/w any two points, then surface is said to be

a. b. c. d.

E V V d.  r b.

a. Small time constant b. Large time constant c. Equal time constant d. None of these

b) Greater than zero d) Infinite

One volt is

a. b. c. d. 46.

E V r c. V 51.

b) Hennery d) Coulomb

Potential gradient is defined as a.

The field inside the hollow conductor will be

a. b. c. d.

A unit of electric charge is a) Volt c) Ampere

50.

Magnetization Electrification Electrostatic induction Electromagnetic induction

a) Zero 2 c) E = kq/r 44.

b) 1990 uF d) None

49.

A method for charging a conductor without bringing a charge body in contact with it is called a. b. c. d.

43.

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6

b. 3 × 10 m/sec 6 d. 4 × 10 m/sec

If mica sheet is place between the plates, the capacity will a. Increase c. Remain same

b. Decrease d. None of these

b) Electric force d) Potential field

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The force exerted by two charged bodies on one another, obeys Coulomb’s law provided that

66.

-23

a) 6.2 × 10 -19 c) 1.6 × 10

a. The charges are not too small b. The charges are in vaccum c. The charges are not too large d. The linear dimension of charges are much smaller than distance between them 59.

60.

61.

a.

r

c.

1 

69.

b) 1 : K 2 d) 1 : K

70.

-15

9

A cylinder of radius R and length L is placed in a uniform electric field E parallel to the cylindrical axis. The total flux for the surface of the cylinder is: a) c)

R 2 / E 2R 2 / E

a)

b) 1.6 × 10 N 13 d) 1.6 × 10 N 72.

b)

q

qvd g

d) None

The ratio of electrostatic force to the gravitational force between them is of the order of 36

38

b) 10 42 d) 10

b) Zero d)

73.

2R 2 E

In an inkjet printer the charged ink drops are diverted by the deflection plates

The constant K in Coulomb’s Law depends upon a) Nature of medium c) Intensity of charge

q

a) 10 40 c) 10

b) System of units d) a & b

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The magnitude of the electric field on the surface of a sphere of radius ‘r’ having a uniform surface charge density  is a)

a) Towards the charging electrodes b) Towards the gutter c) Towards a blank paper on which the print is to be taken d) In inkjet printer ink can not be charged 65.

b) Electron d) Neutron

The charge determined by the Milikan’s experiment is

qvd m mgd c) g  v

The force of proton in electric field of magnitude 6 10 N/c is

b) 1.9KV d) 0.15KV

In Milikan’s experiment, we find the e/m for a) Atom c) Proton

71.

b) Conductor d) Photoconductor

Find the potential at a point, where a charge of -3 1 × 10 coulomb is placed at a distance of 10m is a) 1mV c) 1.6KV

The ratio of the force between two small spheres with constant charges A) in air, B) in a medium of dielectric constant K is

b) 4N d) 8N

Selenium is an a) Insulator c) Semiconductor

1 r 1 d. o

a) 1.6 × 10 N 13 c) 1.6 × 10 N

64.

68.

b.

2

63.

b. Force Law d. None

-21

b) 6.2 × 10 d) Zero

The force between two charges in 8N. now placed a mica of relatively 4 between two charges as a medium, the force then reduced to a) 2N c) 6N

The ratio of Cvac and Cmed is equal to

a) K : 1 c) K : 1 62.

67.

Coulomb Law is also known as a. Electrostatic Law c. Inverse Square Law

How many electrons are in one Coulomb?

c)

74.

 

  r

b) d)

 2 

 2  r

Of the following quantities, the one that is vector in character is an electric a) Charge c) Energy

b) Field d) Potential Difference

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b) Static charge d) None of these

1) If the length and diameter of conductor is double, the resistance is

The Coulomb’s force between two charges q1 and q2 separated by distance ‘r’ is F. If the separation between two charges is doubled keeping charges constant, then Coulomb’s force becomes a) 4F c) F/2

77.

CHAPTER # 13 CURRENT ELECTRICITY

Dielectric has the charge of the type inside it a) Moving charge c) Both a & b

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b) F/4 d) 2F

2 4

-3

R2  R1 R2  R2  R1 d. R

R Ro  R1  R2 c. R1

-3

2 4

b) [ML A T ] d) None

b) Double d) Four time

2) The expression for the co-efficient of receptivity is a.

The dimensions of relative permittivity are a) [A T ML ] 3 2 2 c) [ML A T ]

a) Remain same c) Half

b.

3) The reciprocal of resistivity is called 78.

An alpha particle has twice the charge of a proton. Two protons separated by a distance ‘d’ exert a force ‘F’ on each other. What must be the separation between the alpha particles so that they also exert a force ‘F’ on each other? a) 2d c)

79.

2d

b) d)

2

b) 63.2% d) 30%

Resistance Conduction Conductivity None

4) One coulomb per second is equal to

d 2 d

The ratio of instantaneous charge and maximum charge on plates of capacitors at t = RC is a) 36.8% c) 20%

a) b) c) d)

a) b) c) d)

Joule Volt Ampere Walt

5) In the metallic conductor the current is due to flow of charge a) b) c) d)

Positive Negative Proton None

6) Conventional current flow from a) b) c) d)

Positive to negative Negative to positive Negative to negative None

7) The main source for the current are a) Two b) Three c) Four d) Five o 8) The drift velocity of electron at 0 C is a) b) c) d)

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zero Maximum 1 cm/sec 10 cm/sec

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9) In the thermocouple the heat energy is converted into a) b) c) d)

Mechanical energy Electric energy Magnetic energy None

a) b) c) d)

10) An electric heater 220V, 440W has a resistance a) b) c) d)

17) At null point the current through the galvanometer is Zero Maximum Minimum None

18) A current of 10A flows in a conductors of 10 Ω resistance for 1 mint the heat produce will be

2Ω 110 Ω 0.5 Ω 20 Ω

a) b) c) d)

2

10 J 2 6 x 10 J 3 6 x 10 J 4 6 x 10 J

11) The heating effect of current utilized in 19) The unit of conductivity is a) b) c) d)

Iron Tube light Fan Motor

a. b. c. d.

Ω. M -1 (η.m) -1 Ω.m None

12) Mathematical form of ohm’s law is a) b) c) d)

20) When the bulb is turned on, ohm’s law is applicable

I = VR I = V/R I = R/V R = IV

a) b) c) d)

13) Ohm’s law is valid for only current flowing in a) b) c) d)

Conductors Transistors Diodes Electric Areas

Yes No May or may not None

21) In series circuit the net resistance is

14) Through an electrolyte electric current is passed due to drift of

a. b. c. d.

Increase Decrease Remain constant None

22) Joule law can be expressed as a. b. c. d.

Free electrons Positive and negative ions Free electrons and holes Protons

a) b) c) d)

2

I Rt 2 IR t 2 IRt 2 V /R

15) The e.m.f. of two cells can be compared by 23) The graph b/w V and I in case of ohm law is a. b. c. d.

AVO meter Voltmeter Potentiometer Galvanometer

a) b) c) d)

Parabolic Curve Slope Straight line

16) The post office box is based on the principle of a. b. c. d.

Galvanometer Wheat-stone bridge Voltmeter None

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24) Resistance of supper conductor is a) b) c) d)

Finite Infinite Zero Changes with material

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25) The e.m.f. of a cell or battery is the voltage b/w its terminals, when a. b. c. d.

33) A variable resistors is called a. b. c. d.

It is closed circuit It is open circuit Its internal resistance is zero None

Resistance Rheostat Amplifier None

34) A heat sensitive resistor is called 26) The S.I unit of e.m.f. is same as a. b. c. d.

a. b. c. d.

Work Energy Power Voltage

Amplifier Diode Thermistor Conductor

35) The temperature co-efficient of thermistor is 27) The main type of resistors are a. b. c. d.

a. b. c. d.

Two Three Four Five

28) In the carbon resistor their value can be find by their a. b. c. d.

29) The third band is written in the form of power of a. b. c. d.

2 6 8 10

Greater Less Greater-less None

a. b. c. d.

nd

20000 24000 25000 None

± 2% ± 4% ± 5% ± 6%

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Network Simple circuit Complex circuit None

39) The algebraic sum of all the current at junction is zero, is Kirchoff’s st

32) If the tolerance color is gold then it value is a. b. c. d.

Network Simple circuit Complex circuit None

38) The circuit who has more than one voltage source is called

31) If the first color red and 2 band is green and third band is orange, then value of resistance is a. b. c. d.

Voltage Resistance Temperature Heat

37) A circuit which has only one voltage source is called a. b. c. d.

30) Tolerance color means a. b. c. d.

36) Thermistor can be used for the accurate measurement of a. b. c. d.

Wires Terminals Color Spots

Positive Negative Zero None

a. 1 law nd b. 2 law rd c. 3 law th d. 4 law 40) The algebraic sum of voltages changes around a closed circuit or loop is zero, is Kirchoff’s a. b. c. d.

st

1 law nd 2 law rd 3 law th 4 law

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41) If the resistance of a certain length wire, diameter 5mm is 10Ω if the diameter is charge to 10mm, then new resistance is a. b. c. d.

48) Which one gives pure nature of the material a. b. c. d.

40 5 20 2.5

st

49) Kirchoff’s 1 law is also called law of conservation of

42) The unit for the consumption of electrical energy commonly used is a. b. c. d.

Joule Watt sec K. watt. hr Watt. hr

a. b. c. d. 50.

24000 J 48000 J 144000 J 14400 J

Charge Mass Energy None

The resistivity of copper in Ω.m is -8

43) Heat generated by 40 watt bulb is one hour is a. b. c. d.

Resistively Conductivity Temperature co-efficient None

a. 1.52 × 10 -8 c. 1.56 × 10 51.

b. 1.54 × 10 d. None

-8

The wire used in Rheostate is made from a. Constanton c. Manganin

b. Nichrome d. Tungston

44) The principle of potentiometer 52. a. b. c. d.

P.d  length P.d  resistance P.d.  area None

a. Current c. Resistance 53.

45) A fuse is placed in series with circuit to protect against a. b. c. d.

High power High voltage High current Over heating

54.

Positive Negative Zero None

Electro late Electrolysis Electro-conductor None

Open electric transmission lines

If three resistances of equal resistance R are connected in parallel, the net resistance will a. 3R c.

55.

47) When electricity passes through the liquid then process is called a. b. c. d.

3 R

b.

R 3

d. R + 3

The fractional change in resistivity per Kelvin a. co-efficient in resistance b. co-efficient of resistivity c. Resistance d. None

56.

An electric bulb rated at 220V 140watt is connected to 110v power line, the current that flows in it is a. 1.27 A c. 2.27 A

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b. Voltage d. None of these

a. Obey Ohm’s law b. Obey at high temperature c. Do not obey Ohm’s law d. None of these

46) If the resistor is traversed apposite to the direction of current, then potential is a. b. c. d.

An ideal voltmeter would have an infinite

b. 1.83 A d. 2.83 A

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Which one is non-ohmic? a. Diode c. Copper wire

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b. Carbon resistance d. Tungston wire

Magnetic effect of current is utilized in

a) Nature c) Physical state 66.

a. Iron b. Thermocouple c. Measurement of current d. None 59.

The value of resistance depends upon b) Dimension d) All of them

Conductance is a quantity used to describe the a) Physical state of the conductor b) Electrical properties of material c) Dimension of the conductor d) All of them

The unknown e.m.f can be determined by

67.

The resistivity



of Aluminium in Ωm is

-8

R E r l c. E x  E L a.

60

Ex 

3 Ohm 4

R lE r

68.

-8

69.

d. 4 + 3 Ohm

b) 4  d)  / 4

a) 20 watt c) 2000 watt

72.

b) 20W d) 40W

Thermo couples convert heat energy into

73.

R E r l c) E x  E L Ex 

b)

Ex  E

d)

Ex 

L l

R lE r

Do bends in a wire affect its electrical resistance a) Yes c) Affects a little

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b) An ammeter d) All of them

The unknown emf can be determined and given by a)

74.

b) Chemical energy d) None of these

An accurate measurement of emf of a cell is made by a) A voltmeter c) A potentiometer

b) 40 watt d) 200 watt

b) Every point d) All of them

A zero ohm resistor is indicated by

a) Mechanical energy c) Electrical energy

When the battery is connected at its ends, an electric field is set up at a) Its ends c) Middle

b) 8 d) 5

a) A single silver colour band b) A single black band c) A silver black band d) None of these 71.

A source of 200V provides a current of 10.0 Amperes to a house. The power delivered by the source is

-8

b) 0.5 × 10 d) None of these

The colour code for the colour Grey is a) 7 c) 9

70.

-8

b) 2.60 × 10 d) None of these

The resistivity of Germanium in Ωm is a) 0.7 × 10 -8 c) 0.59 × 10

4 Ohm 3

Four bulbs of 10W, 20W, 30W and 40W are connected in parallel, the bulb that will shine more is a) 10W c) 30W

64.

Ex 

L l

The resistivity of a material is  . If the area of cross-section of material is doubled and length is halved then the resistivity of material is: a)  c) 2 

63.

d.

b.

c. 4 × 3 Ohm

62.

Ex  E

Three two ohm resistors are connected to form a triangle. The resistance b/w any two corner is a.

61.

b.

a) 2.59 × 10 -8 c) 2.63 × 10

b) No d) None of these

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75.

A 50 volt battery is connected across a 10 ohm resistor. The current is 4.5A. The internal resistance of the battery is: a) 1.1 Ω c) 1.3 Ω

76.

a. b. c. d.

b) 1.2 Ω d) 1.4 Ω

A 25 watt and 40 watts bulbs were connected an a series to a 220V line. Which electric bulb will grow more brightly?

5.

6. A 100 watt bulb and a 200 watt bulb are designed to operate at 110V and 220V respectively. The ratio of their resistance is

1 2 1 d) 4

a) 1 c)

a. b. c. d.

1 3

7.

8.



if the angle b/w v and B is zero then magnetic force will be

Iron Steel Moving charge None of these

9.

a. Geo poles b. Opposite to geo poles c. Perpendicular to geo poles d. None

10.

a. b. c. d.

2 fields 3 fields 4 fields None

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11.

Tesla Weber Joule Newton

Tesla is the unit of a. b. c. d.

A moving charge is surrounded by

A helix A circle Straight line Ellipse

The S.I. unit of magnetic flux is a. b. c. d.

The poles of magnet are similar to

Max Min Zero None

when charge particle enter perpendicular to magnetic field, the path followed by it is a. b. c. d.

The origin of magnetism is a. b. c. d.

3.

Stationary charges Moving charges Stationary and moving charge Law of motion

b)

CHAPTER # 14 ELECTROMAGNETISM

2.

Diamagnetic Paramagnetic Ferromagnetic Non-magnetic

Magnetism is related to

a. b. c. d.

1.

North pole South pole Are ionized None

Iron is what type of magnetic material, it is a. b. c. d.

a) 25 watts bulb b) Neither will give light c) Both will have same incandescence d) none 77.

A photon while passing though a magnetic field are deflected towards

Electric field Magnetic field Magnetic field intensity Electric field intensity

It is possible to set a charge at rest into motion with magnetic field

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15.

20.

Electrical Squire Varies with current Circular 21.

4

10 G -4 10 G 6 10 G -6 10 G

22.

23. 16.

The toque in the coil can be increased by increasing a. b. c. d.

24. 17.

A current carrying loop, when placed in a uniform magnetic field will experience a. b. c. d.

2

25.

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CRO Diode Transistor Radio

The force on a charge particle moving parallel to magnetic field is Maximum Minimum Zero None

The presence of magnetic field around a current carrying conductor was detected by a. b. c. d.

Electric flux Torque Magnetic flux Force

-6

1 x 10 N -17 6.4 x 10 N -24 3.6 x 10 N 6 4 x 10 N

The waveform of sinusoidal voltage, its frequency and phase can be found by

a. b. c. d.

No, of tarns Current and magnetic field Area of coil All of above

2

N.A /A 2 N.m /A N.A/m N.m/A

An electron moves at 2x10 m/sec perpendicular to magnetic field of 2T what is the magnitude of magnetic force

a. b. c. d.

Zero 1 wb 0.5 web None

Conductance Electric current Magnetic flux Electric flux

One weber is equal to

a. b. c. d.

2

o

0 o 60 o 90 o 180

The Weber and Maxwell are unit of measure of

a. b. c. d.

The flux through an area of 1 m in x -y plane in a magnetic filed of 1T directed along Z axis will be a. b. c. d.

19.

a. b. c. d.

one Tesla is equal to a. b. c. d.

The magnetic flux will be max, for an angle of a. b. c. d.

Away from you Towards you Clock wise Anti clockwise

The shape of magnetic field around a long straight current carrying wire is a. b. c. d.

14.

18.

A current carrying conductor carries current away from you the direction of magnetic field with respect to you is a. b. c. d.

13.

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Yes No Some Time None

H. orested Ampere Weber Henry

Ampere’s law is applicable to

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T.m/A 2 T.m /A 2 T.m/A None

The value of a. b. c. d.

28.

4 4 4 4

32.

11

 o is 33.

c.

 o NI  o NL o N

d.

None

34.

o 200  o 2000  o

35.

c.

36.

d. None 30.

a. b. c. d. 31.

Electric force Magnetic force Centripetal force None

37.

qb 2m

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Electric Magnetic Phosphors None

The value of restoring torque in galvanometer is a.   r b.   c c.   m d. None

The frequency of cyclotron is given by a. f =

Two Three Four None

The material used in fluorescent screen is a. b. c. d.

When charge particle enters in the uniform magnetic field, the magnetic force will be balance by

Two Three Four Five

In C.R.O. the deflecting plats are a. b. c. d.

a. 20

Electric force Magnetic force Lorentz force None

The main part of C.R.O is a. b. c. d.

A solenoid of length 500m is wonded into 100 turns. A current of 10 A flows in it, the magnetic field intensity is

b.

F = Fe + Fm is a. b. c. d.

The magnetic induction of solenoid is

b.

the e/m value of electron is a. 1.7588 x 10 12 b. 1.75599 x 10 9 c. 1.7588 x 10 14 d. 1.7559 x 10

 x 10-6  x 10-7  x 10-8  x 10-9

a.

29.

qb 2rm qb c. f = 2 qb d. mr b. f =

Circular path Rectangular path To any path None

The unit of permiability of free space is a. b. c. d.

27.

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38.

In the galvanometer the current is proportional to

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Magnetic field Electric field Angle None

a. b. c. d.

When a small resistance is connected in parallel to the galvanometer it is called a. b. c. d.

40.

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45.

Ammeter Voltmeter AVO meter None

46.

a. b. c. d. 43.

a. b. c. d. 44.

The sensitivity of galvanometer is directly depends on a. Magnetic field b. Area of coil c. Number of turns d. All of above

49.

One Tesla is also equal to a. b. c. d.

50.

Current Voltage Resistance All of above 51.

Small resistance High resistance Infinite resistance None

Electric flux Magnetic flux Ampere law None

One Henry is equal to a. V. sec/A c. A.sec/V

52.

an ammeter can be more sensitive if C/BAN is made

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2

web.m -2 web.m web.m None

The dot product of magnetic field are area is called a. b. c. d.

An ideal voltmeter has

Are always connected in series Are always connected in parallel Both in series and parallel None

48.

Series Parallel Series or parallel None

AVO-meter is used to find

Iron Nickel Steel All of them

Ammeter and galvanometer a. b. c. d.

To convert a galvanometer into voltmeter we connect a resistance in a. b. c. d.

42.

47.

Rs = Rg Rs < Rg Rs > Rg None

Which of the following is a hard magnet? a. b. c. d.

IgRg I  Ig IsRg b. Rs = I  Ig IgRs c. Rs = R  Ig IsRs d. Rs = I  Ig a. Rs =

41.

To increase the scale of galvanometer to twice of its initial value we need to connect a shunt a. b. c. d.

To find the shunt resistance we used equation

Very large Very small Unaltered None

b. V.A/sec d. None

The S.I unit of Magnetic Permeability is 2

a. web/m c. web m/A

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13

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53.

Shunt resistor is also called a. By pass resistor c. Reactance

54.

b. Specific resistor d. None

Synchronization controls of CRO are used to synchronize a. Frequency c. Voltage

55.

56.

62.

In C.R.O the anode are at positive potential with respect to cathode is 63.

b. high d. very low

4v Br 2v c. 2 B r

Zv Br 2v d. 2 2 B r b.

64.

The potential difference across the shunt resistor Rs is a)

V  I g Rs

b)

V  ( I  I g ) Rs

c)

V  ( I g  I ) Rs

d)

V  I g Rg

In multi range ammeter

The S.I unit of magnetic permeability is -2

a) TmA -1 c) Fm

C.R.O is same as a. b. c. d.

Radio TV Picture tube Transistor None

65.

66. Weaken it Strength it Reverse its polarity Demagnetize completely

0.1A 1A current sensitivity 1mA

1 weber = _______ a) b) c) d)

6

10 Maxwell 8 10 Maxwell 10 10 Maxwell none

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The brightness of the spot formed on the screen in controlled by the a) Electron c) Potential

Minimum current require to produced a deflection of 1mm on a scale at a distance of 1mm is a) b) c) d)

60

b) Magnet d) None of these

Heating a magnet will a) b) c) d)

59.

-1

b) TmA d) None of these

A solenoid is a cylindrical, long and tightly wound coil of wire. When a current pass through it behaves like a a) Source of emf c) Electromagnet

58.

b) Doubled d) None

a) Resistances of different values are connected in series with galvanometer b) Different resistances are connected in parallel with galvanometer c) Some resistances are connected in parallel and some of them are connected in series d) None

The e/m value for an electron is a.

57.

a) Four times c) Halved

b. Current d. All of them

a. very high c. low

When the number of turns in a solenoid is doubled without any change in the length of the solenoid its self induction will be:

67.

b) Proton d) None of these

Due to radial field, a moving coil galvanometer is a) Comes to rest quickly b) Magnetic field becomes strong c) Movement is frequent d) None of these

68.

A very high resistor Rh is connected in series with the galvanometer in order to convert it into voltmeter

V  Rg I Ig  Rg c) V a)

b)

V  Rg Ig

d)

I  Rg V

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https://www.alqalamcoachingcenter.com/ Ig Magnetic flux passing normally, through a unit c) R s  I  Ig area is called a) Magnetization b) Magnetic field intensity c) Magnetic flux density d) All of these

70.

4

73.

d) None

6

b) Restoring couple d) None of these

a)

v

c)

v

2V m 2V me

3 Ve m 2 Ve d) v  m b)

v

The beam of the electrons is provided by b) Photoemission d) None of these

CHAPTER # 15 ELECTROMAGNETIC INDUCTION

The resistance of a voltmeter should have a very high resistance 1.

The wave form of sinusoidal voltage, its frequency and phase can be found by a) CRO c) Transistor

b) Diode d) Radio

3.

Rs 

V Rg I

b)

Rs 

Vg I  Ig

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Motion of coil Motion of magnet The rate of change of flux None

Induced electric current can be explained using which law a. b. c. d.

The shunt resistance connected to a Galvanometer to convert it into a desired level current measuring ammeter is

a)

The induced e.m.f. is produce due to a. b. c. d.

2.

76.

6 10 5

b) 1T = 10 G -6 d) 1T = 10 G

a) It does not disturb the circuit b) It draws some current c) It same the galvanometer coil d) None of these 75.

b)

In velocity selector method, the velocity of an electron is given by

a) Ionization of atoms c) Electron gun

74.

6 10 4 4 c) 60 10 a)

Couple necessary to produce unit twist is a) Deflecting couple c) Torsion couple

72.

A vertical solenoid has 200 turns in a length of 0.4m and carries a current of 3A in anticlockwise. The flux density in the middle in Tesla is about

The relation between Tesla ( T ) and Gauss (G) is given as a) 1T = 10 G -4 c) 1T = 10 G

71.

77.

d) None

Gauss’s law Faraday’s law Ohm’s law Ampere law

In the motional e.m.f. the mechanical energy consumed is converted into a. Heat energy b. Internal energy

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c. Steam energy d. None 4.

Generator works on the principle of a. b. c. d.

5.

Increase Decrease Remain same None

The self-inductance may be defined by

  / t   / t b) L =   c) L =  / t  d) L =  / t a) L =

Mass Energy Charge None

Magnetic field Electric flux Electric field None

13.

 p / t c. M = -  /  / t b. M =

d. None

Current Voltage No. of turns None

14.

The relation of motional e.m.f. is a. b. c. d.

E=BLV E=qBl E=Blq E=qVB

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Inductance are measured by a) Coulombs c) Volt

Faraday’s law Lenz’s law Ampere law None

Faraday’s law Lenz’s law Ampere’s law Right hand rule

The mutual inductance b/w two coil is a. M = -  / p

15.

16.

Maximum Minimum negligble None

An over loaded motor draws a. b. c. d.

17.

b) Amperes d) Henry

The self inductance in case of D.C circuit is a. b. c. d.

The best way to find the direction of induced e.m.f. in the circuit is a. b. c. d.

10.

12.

The negative sign with induced e.m.f. is due to a. b. c. d.

9.

Torque on rectangular coil Motional e.m.f. Question is wrong None

The induced e.m.f. can also be increase by increasing a. b. c. d.

8.

a. b. c. d.

An inductor is a circuit element that can store energy in the form of a. b. c. d.

7.

If we increase the resistance of coil, the induced e.m.f. will be

Lenz’s law is consistent with law of conservation of a. b. c. d.

6.

11.

Max. current Min. current Half None

The self inductance of a solenoid is a) L =

 n 2



   b) L =   n 2  2 c) L =  nlA 2

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A current of 7Amp/sec flows a steady rate, through a inductor of inductance 25mh, what is the induced e.m.f? a) b) c) d)

19.

3.57mv 175mv 350mv None The energy stored in the inductor is

a) b) c) d) 20.

26.

The energy stored in the inductor per unit volume is

 2 2 0

b.

c.

 4 0

 2 d. 4o

 2o

Within coil Out of coil B/w two coil None

Alternating current changes a. b. c. d.

27.

One ampere in secondary coil Magnetic flux Current in one ampere in secondary None

Mutual inductance exists a. b. c. d.

2

½LI 2 ½L I 2 2 ½L I None

a.

Mutual inductance is numerically equal to the e.m.f. induced in the secondary coil when the rate of change of a. b. c. d.

25.

Its magnitude as well as direction Only direction but not magnitude Only magnitude but not direction None

The coil in A.C generator rotates with rotational speed of 10rad/sec its frequency is a. b.

2  rad/sec 5  rad/sec

5

c. d.

21.

What energy is stored in an inductor of 40mH, when a current of 8A passing through it a. b. c. d.

22.

rad/sec

None

The instantaneous value of A.C. voltage is

c. V = Vo sing 2  wt d. None 29.

Eddy current Hysteresis Electric resistance Inductance

In case of A.C. generator the slip rings a. b. c. d.

30.

The co-efficient of mutual inductance is equal to

Move parallel to coil Are stationary Move along the direction of coil None

The induced e.m.f. in A.C. generator is a. VBL sin



b. NESN sing c.

 t   p   a.   b.     t   p  https://www.alqalamcoachingcenter.com/



a. V = Vo sin 2  ft b. V = Vo sin 2 ft

Lamination of lamina core of transformer is to decrease its a. b. c. d.

23.

160 mJ 1.28 J 1.6 mJ None

28.

d. none

d.



 NIAB sin  NAB sin

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a. b. c. d. 32.

Attract each other Repel each other No effect None of these

Commutaters Slip rings Armature None

Electric motor A.C. generator Reverse generator None

44.

Television Radar Tape recorder All of above

The back e.m.f. exist in the a. Generator

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45.

40 20 10 2

In ideal transformer when p.d. in double the current is a. b. c. d.

Electric mo0ter are used in

Equal to input Less then input More than input None

A transformer changes 12V to 1800V and there are 6000 turns in secondary coil, the no of turn on primary coil is a. b. c. d.

The back ward generator is called

a. b. c. d. 38.

43.

Primary Secondary Middle None

In the actual transformer, the output is always a. b. c. d.

The coil used in the generators is called

Energy Power Voltage All of above

The coil which is connected to input is called a. b. c. d.

42.

Amperes law Mutual induction Motional e.m.f. None

A transformer is a device which step up or stop down a. b. c. d.

41.

Generator Mater A.C. Meter None

a) b) c) d) 37.

40.

The back motor effect exist in the

a. b. c. d. 36.

Slip rings Commutators Slip – chip None

The principle of transformer is a. b. c. d.

Two parallel conducting wires placed closer to each other carry current in the same direction will.

a. b. c. d.

35.

39.

The difference b/w A.C. and D.C. generator in due to

a. b. c. d. 34.

b. Motor c. Transformer d. None

50 Hz 100 Hz 150 Hz 220 Hz

a. b. c. d. 33.

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In Pakistan the frequency of A.C. is

Doubled Tripled Halved Same

Power is effectively supplied to primary coil of step up transformer by a. b. c. d.

A.C. generator D.C. generator Battery Motor

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An adopter is an example of a. b. c. d.

47.

48.

c.

1

Power loss Heating Both a and b None

55.

To over come the eddy current, the core is Laminated with insulation With magnetic With plastic None 56.

Small Large Zero None

To minimize the heating effect in the transmission lines High current low voltage in used High voltage low current in used Same voltage and current in used None

1

b. 1 : 2

2

d. 2 : 1

If a 3cm of wire is moved at right angle to the magnetic field with a speed of 2 miles/sec and if flux density is 5 Tesla, what is the magnitude of induced e.m.f? a. 0.03v c. 0.6v

For a good transformer the hysterics loop are _______ in size.

57.

b. 0.3v d. 10v

When a transformer is connected to 120 volt A.C it supplies 3000 volt to device, the current through secondary winding is 0.6 amp and current through primary is 2 amp, the no. of turns on primary is 400. what is the efficiency of transformer? a. 75% c. 85%

b. 80% d. None of these

A.C and D.C have same a. Effect in charging a capacitor b. Effect in charging a battery c. Effect while passing through an inductor d. Heating effect through a resistor

58.

Load is a device which consume

Magnetic compass needle will be deflecting, if it is kept near a. Static charge c. Semi conductor

59.

Induced e.m.f is a. Directly proportional to change in flux b. Directly proportional to rate of change of flux c. Inversely proportional to change of flux d. None of these

53.

The ratio of e.m.f’s of two cells is equal to

a. b. c. d.

a. Mechanical energy b. Electrical energy c. Frictional energy d. None 52.

54.

2

a. b. c. d. 51.

Step up transformer Step down transformer For both None

a.

a. b. c. d.

50.

a. Output voltage = Input voltage b. Output current = Input current c. Output power = Input power d. Output energy = Input energy

The eddy current produced

a. b. c. d. 49.

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When motor is at its Max. speed the back e.m.f will be a. Maximum c. Cannot tell

60.

b. Soft iron d. Accelerating charge

b. Zero d. None of these

Non inductive resistances are used in decreasing a. Mutual inductance c. Magnetic field

b. Self inductance d. Heating effect

A transformer is said to be efficient if

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Self induction is greater in 70. a) AC circuits c) Both in AC & DC

62.

2

-6

64.

71.

6

b) (10 /μo)J d) None

-1

72.

b) 400% d) None

73.

a) Number of turns b) Area of cross section of coil c) The distance between the two coils d) All of them 65.

a) 100V c) 300V

b) Current d) None of these

In an ideal transformer, the following factors are used

75. Radio frequency (R.F.) shielding of a coil means to protect from external circuit a) Varying magnetic field b) Magnetic field c) Dust and heat d) Electric field The Jerks are created by the use of a) Commutator c) Torques

A copper ring is held horizontally and bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet is a) Equal to that due to gravity b) Less than that due to gravity c) More than that due to gravity d) Depends on the diameter of the ring and the length of the magnet

a) Input and output power is same b) Currents are inversely proportional to voltage c) Currents are directly proportional to voltage d) None of these

69.

b) 200V d) 400V

b) Capacitor d) None of these

74.

68.

A pair of coils has a mutual inductance of 2H. If the current in the primary changes from 10A to zero in 0.1sec, the induced emf in the secondary will be

The back emf effect in motors changes due to a) Inductance of coils c) Voltage

67.

b) 2H d) 4H

The devices in the circuit that consume electrical energy are known as a) Inductor c) Load

66.

-1

b) 2 ms -1 d) 8 ms

What is the self inductance of a coil when a change of current from 0 to 2A in 0.05sec induces an emf of 40V in it? a) 1H c) 3H

In mutual induction, the mutual inductance of the two coils depends upon

b) Radio d) Transformer

If the emf across the conductor of length 1m moving with a uniform speed at right angles to a magnetic field of 0.5T is 2V, the velocity of the conductor is a) 1 ms -1 c) 4 ms

If the speed of rotation of AC generator is made four times of its initial value, the percentage increase in an induced emf is a) 100% c) 300%

The application of mutual induction is a a) Television c) D.C. motor

A solenoid of area of cross section 2.0cm and length 100cm stores energy. When current of 5.0A flowing in it produces B = 0.1T then the stored energy is a) (10 μo)J -6 c) (10 /μo)J

63.

b) DC circuits d) None

An emf of 0.003V is induced in a wire when it moves at right angles to uniform magnetic filed with a speed of 4m/sec if the length of the wire in the field is 15cm, what is the flux density in Tesla? a) 0.003 b) 0.005 c) 6 d) 12 e) 2000

b) Armature d) None of these

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In pure resistive A.C. circuit the voltage and current are a. b. c. d.

5.

The waves which can also pass through the vacuum are a. b. c. e.

6.

c)

8.

1.

a. b. c. d. 2.

9.

Maximum Minimum Zero None

The r.m.s. value of A.C current in a. 0.707 Io b. 0.707 Vo c. 0.708 Ro

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10.

b) 2T



d)



2

Volt Ampere Joule Ohm

If the frequency of A.C in large the reactance of capacitor is a. b. c. d.

The mean value of A.C. over a complete cycle in a. b. c. d.

3.

Sinusoidal Cosine wave Tangent wave None

t 2

The unit used for capacitive reactance is a. b. c. d.

The A.C. e.m.f. can be represented by the wave form called

Resistors Capacitors Inductors All of above

The quality which is called argument of sine or cosine function is a)

CHAPTER # 16 ALTERNATING CURRENT CIRCUITS

Matter wave Mechanical wave Electromagnetic wave Transverse wave

A battery can pass only steady current through a. b. c. d.

7.

In phase Voltage leads the current Current leads the voltage None

Large Small Zero None

In case of capacitor, the voltage lage- behind the current by a. b. c. d.

o

90 o 60 o 30 o 180

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a. b. c. d. 12.

 t  c.   L t 14.

d. None 22.

Null vector Unit vector Phasor None

The combine opposition of resistor capacitor and inductor is called

o

a. b. c. d. 23.

b) XL d) None 24.

Half Same Double Triple

b) Weber d) Ohm

When A.C. flow through RC series circuit the magnitude of voltage is a. V =

 R 2  Xc 2

b. V =

 R2  X L

2

The impedance of RC – series circuit is

V I V b. Z = I Z c. V = I a. R =

The device which is used for controlling A.C. without dissipation of energy is called

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The S.I unit of impedance is called

c. V = IR d. None 25.

Maximum Minimum Zero None

Inductor Capacitor Resistor Choke

Reactance Resistor Impedance None

a) Joule c) Ampere

The average power dissipated in a pure inductor is

a. b. c. d.

Clockwise Anti clockwise Remain stationary None

In case of phasor diagram the velocity vector is called a. b. c. d.

If the frequency of A.C. is double inductor the reactance will be

a. b. c. d. 18.

p t

The resistance of inductor is represented by

a. b. c. d. 17.

 L

Lead the current by 90 o Ledge the current by 90 Remain same with current None

a) Xc c) RL 16.

b.

21.

Increases Decreases Remain same None

In case of phasor diagram the vector rotates a. b. c. d.

In pure inductive circuit the voltage a. b. c. d.

15.

20.

Zero Maximum Minimum None

 L

By increasing the frequency of A.C. through an inductor the reactance will be a. b. c. d.

The magnitude of back e.m.f. in the inductor is a.

19.

3184 3190 3140 3150

In the pure inductor the resistance is a. b. c. d.

13.

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If the capacitance of capacitor is 1µF and the frequency of A.C is 50Hz then reactance will be

d. None

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27.

a. V = I

R 2  XL2

b. V = I c. V = IR d. None

R 2  Xc 2

36.



is

37.

38.

b. Z = c.

Z=

Xc 2  X L

2

39.

2

R 2  X L  Xc 2 2

R  ( XL  Xc)

32.

40.

b) Independent d) None of these

b) Zero d) Three

The frequency at which XL is equal to Xc in called a. b. c. d.

34.

1

b) c = s/t

o o

42.

At resonance frequency the impedance of A.C series circuit is

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Frequency Modulation Amplitude Modulation No, effect None

For the reception of electromagnetic wave we use a variable a) Resistor c) Inductor

Resonance frequency Threshold frequency Non-frequency None

d) None

The super position of sonic wave on EM waves that causes a change in vertical shape of EM waves is a. b. c. d.

41. 33.

The speed of light was found by formula

c) c = 2  rt

At resonance frequency the power factor is a) One c) Two

Oscillation of electric charge Motion of electric charge Motion of electron None

a) c =

The behavior of resistance is frequency a) Dependent c) No, response

Displacement current Conduction current Eddy current None

The fundamental requirement for the generation of electromagnetic wave is

2

d. None 31.

b) Amplifier d) None

The current which is produce due to changing electric flux is called

a. b. c. d.

In case of RLC series circuit the impedance of circuit is

b) Voltage d) None

The electrical oscillators are used in

a. b. c. d.

b) Cos  d) None

b) 60 Hz d) 20 Hz

2

In parallel circuit of A.C. there will be maximum a) Power c) Impedance

At what frequency will a 1H inductor have reactance of 500 ohms

a. Z = R +

Maximum Minimum Can not explain by give data None

a) Metal detectors c) Diode

In equation P = VI cos  , the factor cos called

a) 80 Hz c) 40 Hz 30.

35.

b) P = VI cos  d) None



a) Cosine c) Power factor 29.

a. b. c. d.

The average power in case of A.C. series circuit is a) P = VI c) P = VI sin

28.

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The magnitude of voltage in case of RL – service circuit

b) Capacitor d) None

A.M stands for a. b. c. d.

Amplitude Modulation Applied Metal Accurate Measurement None

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F.M stands for

c. 2H d. 0.5volt When coil of high inductance is used for controlling A.C without dissipation of energy is called

52. a. b. c. d. 44.

Frequency Modulation Frequency Metal Frequency Member None

The process of combing the low frequency signal with high frequency radio-wave is called a) Modulation c) Rectification

45.

53.

b) Amplification d) None

b) F.M d) M.W

a. Soft iron core b. Hard iron core c. Soft iron laminated core d. None 54.

The power consumption in A.C choke is a. Small c. Zero

An A.C voltmeter reads 250volts, its peak voltage is 55. a) 250v c) 353.5v

47.

a. Conductance c. Admittance

a. X – rays b. Infra red rays c. Larger than infra red d. Smaller than infra red

Source current e.m.f. current Applied voltage None

The angular frequency of resonance circuit is

1

a) W =

b) W =

LC LC

c) W =

c)

LC

1 2 LC

d) None

b)

2 LC

d)

1 2

58.

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When a radio station is broadcasting a musical program, the antenna of its transmitter radiates a. R.F electromagnetic waves b. A.F electromagnetic waves c. R.F longitudinal waves d. A.F longitudinal waves

LC

b. 0.5H

Television programs are carried away by a. Low frequency waves b. High frequency waves c. Microwaves d. None

L C

What is the self inductance of a coil in which an induced e.m.f of 2 volt is setup when current changes at the rate of 4 A/sec. a. 0.5 m H

57.

1

Natural or Resonant frequency of an LC circuit is

1 4

51.

Which one is prefer for transmission of radio signal.

b) Two d) Four

In A.C. parallel resonance circuit branch current may be granter then a. b. c. d.

50.

b. Inductance d. None

The types of modulations are 56.

49.

b. High d. Maximum

The reciprocal of impedance is called

b) 350.5v d) None of these

a) One c) Three 48.

b. Choke d. None

An A.C choke is a coil consist of thick copper wire, wound closely over a

Which one give more quality transmission a) A.M c) S.W

46.

a. Inductor c. Impedance

59.

An A.C varies as a function of a. Voltage b. Current c. Voltage and current

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d. Time 60.

c) XL = XC

During each cycle A.C voltage reaches its peak value a. One time c. Four times

61.

62.

70.

In an LCR circuit, if V is the effective value of the applied voltage, VR is the voltage across R, VL is the effective voltage across L, VC is the effective voltage across C, then: 2

2

2

71.

72.

b) Low cost d) None of these

At high frequency the reactance of the capacitor is a) Low c) Very large

65.

66.

74.

b) Independent d) None of these

75.

o

68.

b) Reactance d) None of these

The condition of resonance reached when

76.

b) 100 Ω d) 20 Ω

How many times per second will an incandescent lamp reach maximum brilliance when connected to a 50Hz source? a) 50 times c) 200 times

The combined effect a resistance R, an inductance L, a capacitance C is known as

a) XC > XL

b) 25 d) 200

Find the impedance of an AC circuit when the current flowing in it is 100mA and 10 volts are applied to the circuit. a) 500 Ω c) 23 Ω

In an inductor the phase difference between the current and voltage is

a) Resistance c) Impedance

In a FM broadcast in VHF band channel width is a) 75 c) 88

a) Current lags voltage by 90 o b) Voltage lags current by 180 o c) Current leads voltage by 90 d) None of these 67.

The frequency of modulated carrier waves is lowest when signal amplitude is

b) Large d) None of these

The behaviour of resistance is frequency a) Dependent c) No response

Modulation is the process in which

a) Maximum negative value b) Maximum positive value c) Amplitude zero d) None of these 73.

64.

b) Four d) Eight

a) Amplitude is change b) Frequency is change c) Both a & b d) None of these

The alternating current transmission for long distances has a) Expensive c) Sometimes both a & b

o

b) 45 o d) 120

Since there are three coils, the generator has the terminals a) Two c) Six

a) V = VR + VL + VC b) V = VR + VL + VC 2 2 2 2 2 c) V = VR + (VL – VC) d) V = VL + (VR – VC) 63.

a) 60 o c) 90

b) ½ d) Not defined

2

The phase difference between coils of three phase A.C is o

b. Two times d. None of these

At resonance, the value of the power factor in an LCR series is a) Zero c) 1

69.

d) None of these

b) 100 times d) None of these

The peak value of sinusoidal voltage in an AC circuit is 50V. The rms value of voltage is roughly equal to a) 70V c) 35V

b) 40V d) 45V

b) XL < XC

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1  B 2 r t     e  c) B  2 r t a)

78.

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The magnetic field intensity at appoint due to rate of change of electric flux is

B

1  e 2 r t 1 t d) B  2 r  e b)

4.

B

a) Stress c) Young’s modulus 5.

In RLC series AC circuit, when XL = XC then impedance is a) Minimum c) Zero

Which one of the following physical quantities does not have the dimensions of force per unit?

2

A rubber cord of cross-sectional area 2cm has a length of 1m. when a tensile force of 10N is applied, the length of the cord increases by 1cm. what is the young’s modules of rubber? a. b. c. d.

b) Maximum d) None 6.

8

A wire of length L is stretched by a length L when a force F is applied at one end. If the elastic limit is not exceeded, the amount of energy stored in the wire is _____________

8.

1.

Which of the following substances possesses the highest elasticity? a) Rubber c) Glass

9. 2.

What is the S.I unit of modules of elasticity of substances? a. b. c. d.

b) 0.02J d) 1.0J

A certain stress applied to an elastic materials produces a certain strain in it. If the elastic limit is not exceeded, the energy gained per unit volume of the material is given by_________

-2

Nm -2 Jm -1 Nm Being number, its has no unit

a) Stress/strain c) Stress x strain 10.

3.

b) ½ YE 2 d) ½ YE

A wire, suspended vertically from on end, is stretched by attaching a weight of 20N to the lower end. The weight stretches the wire by 1mm. how much energy is gained by the wire? a) 0.01J c) 0.04J

b) Steel d) Copper

b) ½ (FL) 2 d) ½ FL /L

When a force is applied at one end an elastic wire, it produce a strain E in the wire If “y” is young’s modules of the material of the wire, the amount of energy stored per unit volume of the wire is given by ________ a) YE 2 c) YE

CHEPTER # 17 PHYSICS OF SOLIDS

-2

2 x 10 Nm 6 -2 5 x 10 Nm -6 -2 0.5 x 10 Nm -6 -2 0.2x10 Nm

a) FL 2 c) FL /L 7.

b) Strains d) Pressure

What are the dimensions of stress? -2

a) MLT -1 -2 c) ML T

-2 -1

b) ML T o -1 d) ML T

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b) ½ (stress × strain) d) (stress x strain)

A uniform steel wire of length 4m and area of -6 2 cross section 3 x 10 m is extended by 1mm by the application of a force. If the young’s 11 -2 modules of steel is 2x10 Nm , the energy stored in the wire is ____________

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a) 0.025J c) 0.075J

b) 0.050J d) 0.100J

a. High voltage A.C b. Low voltage A.C c. Alternating current at its peak value d. D.C current is peak value

11. The ratio stress to strains in young’s modules of the materials then tension is _______ a) Directly proportional to extension b) Directly proportional to strains c) Directly proportional square of amplitude d) Inversely proportional to extension

19.

a. Demagnetization c. Extension 20.

12. Materials that undergo plastic deformation before breaking are called ___________ a) Brittle c) Amorphous 13.

b) Ductile d) Polymers

A wire is stretched by a force F which causes an extension 1. the energy stored in wire is ½ FL only if _________

21.

b. Polymerization d. Subtraction

The angular position of cells remains the same for a sample of a crystal this property is called

23.

The breaking of a crystal along definite direction is called a. Cleavage c. Isotropy

15.

Any alteration produced in shapes, length or volume when a body is subjected to same internal force is called __________ a. Stiffness c. extension

24.

The energy band occupied by the valence electrons is called ________

17.

26.

b. Nine corners d. Six corners

The band theory of solids explains satisfactorily the nature of

The curie temperature is that at which ______ a. Electrical insulators alone b. Electrical conductors alone c. Electrical semi conductors alone d. All of the above

a. Semi conductor becomes conductors b. Ferromagnetic becomes paramagnetic c. Paramagnetic becomes diamagnetic d. Metal becomes super conductor 27. 18.

b. Homogeneity d. Clearage

In simple cube, one atom or molecule leis at its a. Four corners c. Eight corners

a. Energy state b. Valence band c. –ve energy state d. Conduction band

b. Symmetry d. Homogeneity

If the density of atoms remains the same along any direction in a crystal is called a. Symmetry c. Isotropy

b. Ductility d. deformation 25.

16.

b. Cleavage d. Dislocation

a. Isotropy b. Cleavage c. Homogeneity d. The external symmetry of form

Formation of large molecule by joining small molecules is __________ a. Fusion c. Crystallization

b. Super conductors d. Conductors

The bulk properties of materials such as their mode of fracture, can be related to their a. Polymerization c. Microstructure

22.

b. Breakage d. Surface cracking

Materials in which valence electrons are tightly bound to their atoms at low temperature are called _________ a. Semi conductors c. Insulators

a. The extension of the wire is proportional to the force applied. b. The weight of the wire is negligible c. The wire is not stretched beyond its elastic limit d. The cross sectional area of the wire remains constant 14.

Coercion force is the force which opposes

A vacant or partially filled band is called _____

A ferromagnetic will become fully magnetized at

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Visit for more educational notes a. Conduction band c. Forbidden band 28.

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b. Valence band d. Empty band

b. Magnetic resonance imaging c. Magnetometer d. Oscilloscope

A completely filled band is called _______ 37. a. Conduction band c. Forbidden band

29.

b. Valence band d. Core band

a. Hysterics curve c. Hysterics loop

The electrons in conduction band are free to ___________ 38. a. Transport vibrations b. Transport signals c. Transport charge d. Transport impulses

30.

b. Conductors d. Non-metals 39.

31.

many of the semi conductors are crystals of the type ________ a. Face centered cubic b. Body centered cubic c. Simple cubic d. All of the above

32.

40.

41.

34.

Holes can exists in_________

42.

b. insulators d. all of the above

b. P.E d. Electrical

The area under stress – strain graph is b. Energy d. Impulse

Polymers are usually a. Organic compounds b. Non-organic compounds c. Acidic d. Alkaline

In a semi conductors, the charge carriers are __________ 43.

The resistance against any distortion by solid is a. Toughness c. Stiffness

44.

b. Ductility d. None

Solid material that are brittle are

The net charge on N-type material is ________ a. Positive c. Both a & b

a. Toughness c. Stiffness

b. Negative d. Neutral 45.

36.

b. Protons d. Holes

According to free electron theory the only energy possessed by electron is

a. Power c. Momentum

a. Holes only b. Electrons only c. Electrons and holes both d. All of the above 35.

Minority carriers in N-type materials are

a. K.E c. Gravitational

With increase in temperature, the electrical conductivity of intrinsic semi conductors ______

a. Conductors c. semi conductors

Pentavalent impurities are called

a. Electrons c. Neutrons

a. Decreases b. Increases c. Remain the same d. First increases, then decreases

33.

b. Hysterics loop area d. Straight line

a. Donor impurities b. Acceptor impurities c. Some times donor and some times acceptors d. None of these

Which one has the greatest energy gap _______ a. Semi-conductors c. Metals

Energy needed to magnetic and demagnetize is represented by

b. Ductile d. None

Very weak magnetic fields are detected by _____

The temperature at which conductors lose its resistivity is called

a. Squids

a. Supper temperature b. Kelvin temperature

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d. None

o

The magnetic domains are the small regions of the order of 58. a. Millimeter c. Micron

47.

b. Micrometer d. None

b. 450 km/hr d. 550 km/hr

b. Kmaerling d. None

b. Nitrogen d. All of them

62.

b. Ionic compounds d. All of them

b) Ductility d) None

The Young modulus of elasticity is Y. If the forces is increased such that the extension produced becomes double of its initial value then Young Modulus is a) Double c) Unchanged

b) Halved d) None

b. 55 d. 110

When an atom is isolated its energy lavels are a. Distinct c. Very very close

63.

b. Very close d. None

a) – 8.0 × 10 m -4 3 c) 2.0 × 10 m

b. Partially filled d. None of these

64.

When semiconductor is doped by trivalent, it has a. More electrons c. + ive charge

A hydraulic press contains 0.25m3 oil of bulk 7 modulus 5.0 × 10 Pa. The change in volume of oil when subjected to pressure increase of 1.6 × 7 10 Pa is -4

The valence energy band can never be a. Filled c. Empty

3

-4

b) 4.0 × 10 m -4 3 d) 10 m

3

The resistivities of conductors, semiconductors and insulators are of the respective orders of 8

-4

a) 10 Ω.m, 10 Ω.m -4 4 8 b) 10 Ω.m, 10 Ω.m, 10 Ω.m -4 8 4 c) 10 Ω.m, 10 Ω.m, 10 Ω.m 4 -4 8 d) 10 Ω.m, 10 Ω.m, 10 Ω.m

b. More holes d. – ive charge

The field of long bar magnet is like a 65. a. Solenoid c. Pieces of magnet

57.

The ability of a material to be hammered, pressed, bent, rolled, cut, stretched into useful shape is

Young’s Modulus for copper is a. 25 c. 100

56.

b. Two d. Four

a) Toughness c) Stiffness

Crystalline solids are also a. Metals c. Ceramics

55.

b. Copper d. None

Polymers have chemical combination with a. Carbon c. Hydrogen

54.

How many types of strain are there a. One c. Three

61.

53.

b. No units d. None

Examples of brittle substances are a. Glass c. Lead

52.

Strain is dimensionless and has a. Units c. S.I units

60.

51.

b. Copper d. All of them

The first supper conductor was discovered by a. Fermi c. Weinberg

50.

The examples of diamagnetic are a. Water c. Antimony

59.

49.

b. 650 C o d. 750 C

A bullet train move with max the speed of a. 400 km/hr c. 500 km/hr

48.

o

a. 600 C o c. 700 C

b. Toroid d. None

The curie temperature of Iron is

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Diamagnetic needle when placed between the poles of a magnet align itself in the direction a) Parallel to B c) Perpendicular to B

b) Anti parallel to B d) None

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Crystalline solids are also a) Metals c) Ceramics

67.

With the rise of temperature the amplitude of atoms

77.

b) Fixed d) None of these 78.

b) Molecules d) All of them

a) Horse shoe magnet b) Bar magnet -10 18 c) Electromagnet d) 10 to 10 79.

b) Nitrogen d) All of them

80. b) Elasticity d) None of these

72.

b) Copper d) None of these

Semiconductor materials have the conductivities generally lies between -5

-6

-1

a) 10 to 10 (Ω.m) -7 -3 -1 c) 10 to 10 (Ω.m) 73.

-6

-4

b) 10 to 10 (Ω.m) d) None of these

82.

b) Valence band d) None of these

b) Very small d) None of these 83.

75.

Doping is the process in which the small amount of impurity is added into the pure semiconductor lattice in the ratio 3

a) 1 to 10 5 c) 1 to 10

The strain energy density is given by a)

U

d)

U  ( Stress  Strain)

1

3

When the conductivity of a semiconductor is only due to breaking of the covalent bonds, the semiconductor is called a) Donor c) Intrinsic

4

b) 1 to 10 6 d) 1 to 10 84.

76.

The energy need to magnetize and demagnetize the specimen during the each cycle of magnetizing current is

1 ( Stress  Strain) 2 1 b) U  ( Stress  Strain) 3 c) U  Stress  Strain

Conductors are those materials in which the free electrons a) Very large c) Plenty of

b) Coercive current d) None of these

a) Value of current b) Value of demagnetizing current c) Value of magnetic flux density d) Area of the loop

-1

The electrons occupying the outermost shell of an atom and the electrons occupying in the energy band are called a) Energy band c) Forbidden energy band

74.

81.

b) 1 leads B d) None of these

A current which demagnetize the material completely is called a) Applied current c) Maximum current

Examples of brittle substances are a) Glass c) Lead

In the phenomenon of hysteresis, the magnetism and magnetizing current behaves as a) 1 lags c) 1 & B becomes equal

If the stress increased on a material is beyond the yield strength of the material is called a) Plasticity c) Still in elasticity

71.

The combination of solenoid and a specimen of iron inside it make a powerful magnet called

Polymers have chemically combinations with a) Carbon c) Hydrogen

70.

The magnetism produced by electrons within an atom is due to a) Spin motion b) Orbital motion c) Spin & orbital motion d) None of these

Crystal lattice is a repetition of a) Atoms c) Unit cell

69.

a) MRI b) Magnetic levitation trains c) Faster computer chips d) All of them

b) Ionic compounds d) All of them

a) Slow down c) Increases 68.

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b) Acceptor d) Extrinsic

What is the S.I unit of magnetic permeability?

The technological uses of super conductors are

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a) Ampere per meter b) Ampere meter c) Henry per meter d) Being a dimensionless number, it has no unit

input AC d) Either positive or negative half cycle of input AC 3.

a) b) c) d) 4. a) b) c) d)

a) It has low resistance to the current flow when forward biased b) It has high resistance to the current flow when reversed biased c) It has low resistance to the current flow when forward biased and high resistance when reversed biased d) None of the above 2.

In half ware rectification, the output DC voltage is obtained across the load for

a) The positive half cycle of input AC b) The negative half cycle of input AC c) The positive and negative half cycles of

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Its forward biased Its reversed biased The amount of forward current The type of semi conductor material used

a) b) c) d)

Operated in forward direction Operated in reversed direction A very fast photo detector Dependent on thermally generated minority carriers

7.

A semi – conductor can be used as a rectifier because

The color of light emitted by LED depends on

A PN junction photodiode is

a) b) c) d)

1.

It uses four diodes Its transforms has no counter tap It needs much smaller transformer It has higher safety factor

5.

6.

CHAPTER # 18 ELECTRONICS

A bridge rectifier is preferable to an ordinary two diodes full ware rectifies because

The emitter of a transistor is generally doped the heaviest because it Has to dissipate maximum power Has to supply the charge carriers Is the first region of transistor Must posses law resistance

For proper working of a transistor in normal circuits

a) Emitter base junction is reversed biased, collector base junction is forward biased b) Emitter base junction is forward biased and collector base junction is forward biased c) C-B junction is reversed biased, E-B junction is forward biased d) C-B junction is reversed biased and E-B junction is reversed biased 8.

a) b) c) d) 9.

In a properly biased NPN transistor most of the electrons from the emitter Recombine with holes in the base Recombine in the emitter itself Pass through the base to the collector Are stopped by the junction barrio The current gain of a transistor is given by

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IC IB I d. B IE

a.

b.

a) High c) Different 19.

10.

When the E-B junction of a transistor is reversed – biased, collector current

a) Is reversed c) Decreased 11.

An op-AMP has

12.

20. b) Infinite Ri d) All the above

21. a) 1000 -13 c) 10 13.

a) b) c) d) 14.

b) -1000 -6 d) -10

22.

Current and time Voltage and time Voltage and current Forward voltage and reverse current

b) OFF d) High

Which of the following are electromagnetic waves a. b. c. d.

Sound waves Water waves Light waves Waves along a stretched string

b) OFF d) High

A logic gate is an electronic circuit which

23.

Makes logic decision Work on binary algebra Alternates between 0 and 1 None of these

The EM waves travel is free space with the velocity a. b. c. d.

Equal to the velocity sound Equal to the velocity light More than the velocity of light Less than the velocity of light

In positive logic, logic state 1 correspond to 24. a) b) c) d)

17.

A NOR gate is ON only when all its input are

A NOR Gate is ON only when all its input are

a. b. c. d. 16.

Stop a signal Re-complement a signal Invert an input signal Acts as a universal gate

a) ON c) Positive

A diode characteristic curve is a graph between

a) ON c) Positive

15.

Implement logic addition Is equivalent to a series switching circuit Is any or all gate Is equivalent to a parallel switching circuit

The only function of a NOT gate is to a. b. c. d.

An inverting amplifier has Rf = 2mл and Ri = 2Kл, its scalar factor is

b) Low d) Same

An AND Gate a. b. c. d.

b) Increased d) Stops

a) Infinite AV c) Zero Ro

An XOR gate produces an output only when its two inputs are

Positive voltage Higher voltage level Zero voltage level Lower voltage level

a. b. c. d.

The output of a 2-input OR gate is zero only when its 25. a. b. c. d.

Both input are zero Either input is 1 Both input are 1 Either input is 0

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A changing electric flux develops in the surrounding space An electric field A magnetic field An electromotive force Gravitational field

EM waves transport a) Matter c) Energy

b) Wavelength d) Charge

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a. b. c. d. 27.

36.

Expanding plane wave fronts Concentric spheres Expanding curves None of the above

EM waves have frequency of the range of 4

a.

c.

5

38.

Transfer of current Transfer of voltage Transfer of resistance Transfer of charge

The thickness of depletion region is of the order of -7

b.

d.

I  o uo

39.

b) Solar cell d) Photo voltaic cell

The term transistor stands for

a) 10 cm -5 c) 10 cm

I uo

uo

The specially designed semi conductor diodes used as indicator lamp in electronic circuit are

a. b. c. d.

b. 10 Hz 12 d. 10 Hz

Maxwell derived mathematically that velocity of EM-waves is

I o o

Photo diodes LED Solar cell Photo voltaic cell

a) Photo diodes c) LED 37.

b) Arsenic d) Silicon-dioxide

Specially designed semi conductor diodes used as fast counters in electronic circuits are a. b. c. d.

Stationary Longitudinal Transverse All of the above

a. 10 Hz 6 c. 10 Hz 30.

35.

The waves from the antenna are a. b. c. d.

29.

a) Bismuth c) Antimony

Longitudinal waves EM waves Sound waves Radio waves

EM waves emitted from antenna are a. b. c. d.

28.

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Waves emitted from the antenna are

-6

b) 10 cm -4 d) 10 cm

In amplitude modulation, the wave superimposed on EM waves are a) Water waves c) Light waves

31.

A junction between P and N materials forms a. b. c. d.

32.

A rectifier An amplifier A semi conduction An oscillator

The forward current through a semiconductor diode circuit is due to a) Minority carriors c) Holes

33.

41.

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Zero resistance Infinite resistance Low resistance High resistance

The P.d across the depletion region of silicon is a. 0.5v c. 0.7v

42.

43.

b. 0.67v d. 0.8v

A Transformer used in rectification acts as a. Step-up c. Center trapped

b) A detector d) A rectifier

A photo diode is a semi conductor device usually made from

A junction diode when forward biased behaves as a device of a. b. c. d.

b) Majority carriors d) Electrons

The device used for conversion of AC into DC is a) An oscillator c) An amplifier

34.

40.

b) Sound waves d) Matter waves

b. Step-down d. None

The ratio of β shows the a. voltage gain

b. current gain

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d. None 56.

44.

45.

The alarm requires a voltage for its activation is

The Boolean expression X = A + B represents the logic operation of

a. low c. Very High

a. NAND gate c. OR gate

b. high d. None

What is the gain of op – amplifier if R1 = infinity and R2 = 0Ω a. 15 c. 1

57.

58. 46.

The resistance between + ive and – ive inputs of op – amplifier is a. 100 Ω 6 c. 10 Ω

47.

49.

50.

54.

b. Switches d. All of them

61.

b. High d. Low

The width of depletion region of a diode

A LED emits lights only a. Forward biased c. Un biased

b. Reverse Biased d. None of these

b. Two inputs d. None 62.

b. 60% d. 90%

b. Micro seconds d. None

63.

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In the use of a transistor as an amplifier a) The emitter-base junction is forward biased and the collector-base junction is reverse biased b) The emitter-base junction is reverse biased and the collector-base junction is forward biased c) Both the junctions are forward biased d) Any of the two junctions may be forward biased

b. Current amplifier d. None

b. Two d. Four

In a pn junction, the barrier potential offers opposition to only a) Majority carriers in both regions b) Minority carriers in both regions c) Electrons in n – region d) Holes in P – region

Transistor is a device which has ________ terminals. a. One c. Three

The open loop gain of op – amplifier is

a. Increases under forward bias b. Is independent of applied voltage c. Increases under reverse bias d. None of these

A transistor is a circuit basically act as a. Voltage amplifier c. Power amplifier

55.

b. 2 d. 3

A photo – diod can switch its current ON and OFF in a. Milli seconds c. Nano seconds

XOR gate is combination of

a. Zero c. Very high 60.

The efficiency of half wave rectifier is roughly a. 40% c. 70%

53.

b. No external bias d. None

NOT gate has only a. One input c. Many inputs

52.

59.

Transistor can be used as a. Oscilators c. Memory unit

51.

b. 1000 Ω d. None of these

In NOR gate 1 + 1 = ________ a. 0 c. 1

b. Detector d. Amplifier

a. AND, OR and NOT gate b. NAND, OR and NOT gate c. NOT, AND and OR gate d. NOT, AND and NOR gate

Photo – voltic cell have a. Battery input c. No internal bias

A diod can not be used as a. Rectifier c. Oscilator

b. 1000 d. Cannot tell

b. NOR gate d. NOT gate

64.

NAND gate is a combination

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a) AND gate and NOT gate b) AND gate and OR gate c) OR gate and NOT gate d) NOT gate and NOT gate 65.

The reverse or leakage current of the diode is of the order of a) Microampere c) Both

66.

-2

76.

Vout  Vin Vout R   ie d) Vin Rie b)

The resistance between (+) and (-) of ideal Op-Amp is a) High c) Infinity

-4

b) 10 m -8 d) 10 m

77.

b) Low d) Moderate

Temperature, pressure etc are converted into electronic informations by devices called a) LEDs c) Vacuum tubes

V b) A  Vi

b) Sensors d) None

d) None of these

The positive sign of the gain indicates that

CHAPTER 19 DAWN OF MODERN PHYSICS

1.

The electronic circuits which implement the various logic operations are known as

A diode characteristic curve is a plot between

2.

Greater than one meter Less than one meter One meter None of these 0.001 Kg mass will be equivalent to a) 2.5 GWh c) 0.26 GWh

3.

In a half-wave rectifier the diode conducts during

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An observer shoots parallel to a meter stick at very high speed (relativistic) and finds that the length of meter stick is __________ a) b) c) d)

b) Logic gate d) All of them

a) Current and time b) Voltage and time c) Voltage and current d) Forward voltage and reverse voltage 73.

Vout R  C Vin Rie Vout R   ic c) Vin Rc a)

b) Millisecond d) None of these

a) Digital gates c) Voltage operated gate 72.

For typical transistor as an amplifier

b) Three d) None of these

a) Input and output signals are not in phase b) Input and output signals are in phase c) May be in phase or not d) None of these 71.

75.

b) Either input is 1 d) Either input is zero

The gain A of the amplifier is

Vin a) A  V c) A  V Vin

70.

a) Both inputs are O c) Both inputs are 1

The base of the transistor is very thin of the order of a) 10 m -6 c) 10 m

69.

The output of a two inputs OR gate is O only when its

A photodiode can turn its current ON and OFF in a) Microsecond c) Nanosecond

68.

74.

b) Milli-ampere d) None of these

How many diodes are used for the full wave rectification is a) Two c) Four

67.

a) Both halves of the input cycle b) A portion of the positive half of the input cycle c) A portion of the negative half of the input cycle d) One half of the input cycle

b) 25 GWh d) 250 GWh

Which of the following radiations has the greatest photon

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Visit for more educational notes a) TV waves c) X-rays 4.

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b) Microwaves d) γ - rays

12.

A photon is a ____________ a. b. c. d.

Linear momentum of a photon is 2

a) Zero c) hf/c

b) Hf/c 2 d) c /hf

13. 5.

Which one of the following has the largest energy content?

The linear momentum of an x-ray photon of o wavelength 0.1A is a) b) c) d)

6.

3

a. 10 photons of wavelength 2pm (Y-rays) 2 b. 10 photons of wavelength 1mm (X-rays) 6 c. 10 photons of wavelength 50mm (Infrared) 6 d. 10 photons of wavelength 200mm (UV)

-23

6.625 x 10 NS 23 66.25 x 10 NS 23 662.5 x 10 NS Data is insufficient Stopping potential for a metal surface incase of photo electric emission depends on

14.

A transmitting station emits radio waves of wavelength  at power p. if h is plank’s constant C the speed of light, what is the rate of emission of photon?

a) The threshold frequency for the metal surface b) The intensity of incident light c) The frequency of incident light and the work function for metal surface d) None of these 7.

Select an alternative form of uncertainty principle from the following a. c.

8.

h/moca 2 mc = hf

Unit of energy Positively charged particle Quantum of electromagnetic radiations Unit of wavelength

b. d.

a) pc/h  c) p  /hc 15.

b) hc/p  d) ph/ck

After traveling through a vacuum, a photon of light entering into some transparent denser medium. Thus the energy of light _________.

E. t  h

a. b. c. d.

any of the above

The existence of ether wind was experimentally rejected by

Increase because wave light decrease Decease because speed decrease Remains same Increase then decrease

a) HeisenbergEinstein b) Michelson and Morely d) De-Broglie d) None

9.

a) b) c) d)

10.

As the temperature of black body is raised, the wavelength corresponding to maximum intensity

Shifts towards longer wavelength Shifts towards shorter wavelength Remains the same Shifts towards shorter as well as longer wavelength

b) Zero d) Very large

17.

The name of photon for quantum of light was proposed by a) Ampere c) Thomson

b) Planck’s d) Einstein

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In a photo electronic effect, monochromatic light, is incident on a metal surface. If the incident light of twice the intensity but the same wave length, the kinetic energy of the emitted electron ______ a) Becomes double b) Remains same c) Becomes half d) First increase then decreases because curvilinear graph.

Rest mass of photon is a) Infinite c) Very small

11.

16.

If the wave length of incident radiation is increase in photo emission, then _________ a) The minimum kinetic energy of the photo electrons increase b) The minimum kinetic energy of the photoelectrons decrease c) The minimum kinetic energy of the photoelectrons increase

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d) The average kinetic of the photoelectrons decrease

d. Converging source of electrons 25.

18.

If a photon is reflected from the mirror, then the change in momentum of each photon is ________ a) Zero c)

19.

c.

c.

26.

d) Ft



nh

b.

 Zero

d.

2nh

27.

a. b. c. d.

7

10 m/sec Should be greater than speed of light Be zero Not be wave link

-36

28.

2h m 2mc 2 h

b. d.

mSc 2 h h m 29.

30.

In electron microscope, electric and magnetic field are used as _______ a. Electromagnetic gun b. Source of electromagnetic waves c. Deflected charged particle

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Photon theory of light Deal nature of light Wave nature of light Uncertain nature of light

Electron moves in the orbit as ______ a. b. c. d.

Wave property Particle property Energy particle Electromagnetic wave property

Karl-wein’s laws Raleigh jeans law Stephens law Planck’s

Compton effect proves the _______ a. b. c. d.

b) Wave property d) Quantum property

If a diffracted grating is placed in the path of a light beam, it revels ______

The energy radiated is directly proportional to fourth power of Kelvin’s temperature is _____ a. b. c. d.

31. 24.

Property of matter and radiation Two dimensional motions Emotion of certain wave length Very high velocity

For confinement of electron in a box of radius -14 10 m. the electron speed should be ____

nft

In Davison – Germer experiment, the diffracted proton from crystal shows ____________

a. b. c. d.

Electron microscope Scanning electron microscope Magnetic imaging None of the above

The uncertainty in momentum and position is due to its ___________ a. b. c. d.



5.53 x 10 kg 0 Kg -36 2.46 x 10 kg -44 1.84 x 10 kg

a) Particle property c) Light property 23.



The velocity of particle of mass m of deBroglie wave length  is ________ a.

22.

h

A photon of wave length 900mm behaves like a particle of mass ________ a. b. c. d.

21.

h

a. b. c. d.

If n number of photon are striking on a metal surface, then the total momentum exerted is ______ a.

20.

b) 2

A three dimensional image is obtained by ______________

Simple vibratory motion Standing wave motion Vibratory motion like up and down S.H.M like sound

The mass of an object will be doubled at speed 8

a. 1.6 × 10 m/sec 7 c. 2.6 × 10 m/sec 32.

8

b. 2.6 × 10 m/sec d. None

The anti-particle of electron is

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Visit for more educational notes a. Proton c. Meson

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b. Position d. Neutron

42.

33. The reverse process of pair-production is a. Annihilation c. Fission

a. Time c. Speed of light

b. Materialization d. Fussion

43.

34. The decrease in length with speed was explained by a. Einstein c. Bohr

According to special theory of relatively the 4 variable is

b. Lorentz d. None

a. Light is energy b. Earth rotates about its axis c. Ether medium does not exist d. None

b. Water d. Vacuum

The wavelength of photon with energy of 16 × 10 -19 J is o

35. The famous Michel-son-Morely experiment proves that

o

a. 12.4 A o c. 124 A 45.

b. Space d. None

Pair production cannot possible in a. Air c. Glass

44.

th

b. 1.24 A d. None

The concept of antimatter was predicted theoretically by Dirac in a. 1928 c. 1935

b. 1930 d. None

36. All the motion in this universe are 46. a. Absolute c. Variable

b. Uniform d. Relative

a. Sun c. Black hole

37. On a hot day white clothes are cold because they are a. Reflective c. Radiators

38.

39.

40.

41.

49.

b. 1.02 Mev d. None

Photo electric effect for visible light can be obtain from

50.

51.

b. Large wavelength d. None

The relation

b. Rectifier d. Photo – cell

 Max T  Contt.

a. Wein’s Law c. Stephen Law

b. Large wavelength d. None

b. Carbon – oxygen d. None

Sound tracks of movies can be controlled by a. Diode c. Amplifier

b. Stephen – Boltzman Law d. None

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The minimum energy required for pair production is

a. Sodium – Potassium c. Helium – Neon

Plank’s theory is hold good for a. Short wavelength c. All wavelength

48.

b. U.V region d. None

Wein’s displacement law holds good for a. Short wavelength c. All wavelength

b. Moon d. None

a. 10.2 Mev c. 102 Mev

The energy emitted is directly proportional to fourth power of temperature is a. Lummer Law c. Wein’s Law

47.

b. Absorbers d. None

The radiation emitted by human body lies in the range of a. Infrared region c. Visible region

The anti-particle of earth is

is

b. Plank’s Law d. None

A. H Compton was awarded Nobel Prize in Physics in a. 1927

b. 1923

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d. 1919 61.

52.

The life time of an electron in an excited state is -6 10 sec. What is uncertainly in energy for this time? -20

a. 2.35 × 10 J -26 c. 1.05 × 10 J 53.

b. Very low d. None

3

12

58.

59.

60.

-3

65.

b. Pair-production d. None 66.

13

b. 10 Hz 15 d. 10 Hz

67.

t  t

c)

t

3 t 2 2 d) t  t 5

2 t 3

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v2 A quantity 1  2 is always c b) Less than one d) None of these

At higher temperature, the body emits long wavelength in the region b) Ultraviolet d) None of these

The Stefen-Boltzmann has the value -5

b. 1925 d. 1928

b)

b) Relative d) None of these

-2

-4

a) 5.67 × 10 Wm K -6 -1 -4 b) 5.67 × 10 Wm K -6 -2 -4 c) 5.67 × 10 Wm K -8 -2 -4 d) 5.67 × 10 Wm K 68.

The energy of photon of radio waves is only about -6

C A passenger passes a clock with a speed . 2

a)

The concept of position is purely

a) Infra red c) Far-infra red

b. Energy d. None

The time period observed by him is:

-48

b) 10 N-S -20 d) 10 N-S

a) Greater than one c) Equal to one

Loius Broglie give the idea of Matter – wave in a. 1924 c. 1926

o

The uncertainty in position of electron is 6.63A . The uncertainty in momentum of electron is -24

b. 1.38 × 10 m.k d. None

Each quantum is associated with radiation of a. Intensity c. Frequency

b) 0.12nm d) 120nm

a) Specific c) Ordinary

If work function is 4.14ev, the threshold frequency of incident light is a. 10 Hz 14 c. 10 Hz

The wavelength associated with electron moving 6 with speed 5.6 × 10 m/s is

a) 10 N-S -16 c) 10 N-S 64.

The reverse process of Photo-electric effect is a. Compont Effect c. Annihilation

57.

63.

The value of Wein’s Constant is a. 2.9 × 10- mol .k -3 c. 3.51 × 10 m.k

56.

b. Electron micrograph d. None

-38

b) 13.26 × 10 J d) None

a) 12nm c) 1.2nm

At stopping potential current passing through circuit is a. Mini c. Zero

55.

62.

The photograph taken by electro-microscope is called a. Photograph c. Chronograph

54.

-38

a) 13.26 × 10 ev c) 13.26 ev

-20

b. 1.09 × 10 J d. None

-4

The threshold frequency of metals is 2 × 10 Hz. The work function of metal is

a) 10 eV -10 c) 10 eV 69.

-4

b) 10 eV -12 d) 10 eV

The stopping potential when intensity is kept constant is a) Same c) Both a & b

b) Different d) None of these

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Visit for more educational notes 70.

a) Einstein c) Compton 71.

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The idea of quantization of energy was proposed by b) Max Planck d) None of these

a) Energy c) Momentum & Energy 80.

a) Length c) Mass

b) Photo transistor d) None of these 81.

In Compton effect, the law/laws are conserved a) Energy c) Both

73.

b) Momentum d) None of these

Photon ‘A’ has twice the energy of photon ‘B’. What is the ratio of the momentum of ‘A’ to that of ‘B’? b) 2 : 1 d) None

The equations of pair production is 2

-

82.

+

An electron accelerated through a P.D, V has a wave associated with it of wavelength

12.3 V A  2  c) 12.3 / V A a)

b)

12.3 / VA 

d) None

Louis De Broglie received Nobel prize in physics in a) 1926 c) 1925

75.

b) Time d) None

a) 4 : 1 c) 1 : 2

a) hf = 2moc – KE(e ) + K.E (e ) 2 + b) hf = 2moc + KE(e ) + K.E (e ) 2 2 + c) hf = 2mo c + KE(e ) + K.E (e ) 2 + d) hf = 2mo c + KE(e ) + K.E (e ) 74.

Which of the following has the same dimension as h/moc?

Application of photoelectric effect is a) Photo diode c) Photocell

72.

b) Momentum d) None of these

b) 1922 d) 1929

The high energy electrons penetrate the specimen to reasonable thickness and acquire sufficient energy due to its a) Short wavelength b) Extremely short wavelength c) Long wavelength d) None of these

76.

a) 0.1 μm c) 0.3 μm 77.

In Compton effect a) Less than  c) Equal to 

78.

CHAPTER # 20 ATOMIC SPECTRA

The best optical resolution is made by the microscope is 1.

b) 0.2 μm d) None of these



Ratio of the weight of H-atom to that of an electron is approximately ________ a. 183.336 c. 18360.00

is always b) Greater than  d) None of these

2.

Who discovered the idea of Ether?

Photon of high frequency will be absorbed when transisation takes place from _________ st

a) Schrodinger c) Michelson and Morley 79.

Can pair production takes place in vacuum because of conservation of

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th

a. 1 to 5 orbit rd th c. 3 to 5 orbit

b) De-Broglie d) None of these 3.

b. 1836 d. 183.60

nd

th

b. 2 to 5 orbit th th d. 4 to 5 orbit

In Hydrogen spectrum, which one of the following series lies in the ultraviolet region?

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a. Ballmer series c. Lyman series 4.

b. Pfund series d. Bracket series

In obtaining an x-ray photograph of our hand, we use the principle of _______ Photo electric effect Ionization Shadow photograph Any of above

5.

-10

12.

-8

13.

8.

9.

15.

th

Which one of following postulate is in accordance with the Rutherford’s model?

17.

20. a. 13.60eV

b. 3.40eV

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b. Compton effect d. X-rays production

b. Positive rays d. α - rays

The penetrating power of X-ray depends on their ____________ a. Applied voltage c. Source

th

Ground state energy of the 4 orbit in a H-atom is ________

b. Infrared radiation d. Ultraviolet rays

X - rays are similar in nature to _______ a. Cathode rays c. γ - rays

19.

th

b. 5 orbit nd d. 2 orbit

Reverse process of photo electric effect is __________ a. Pair production c. Animation of matter

X-rays are ___________

b. X-rays d. Visible radiations

In an electronic transisation, atom cannot emit _________ a. γ - rays c. Visible light

18.

2

Bracket series is obtained when all transition of electron terminate on _____ a. 4 orbit rd c. 3 orbit

16.

2

b. Ice /rn 2 2 d. –ke /rn

Radiation with wavelength longer than red light________ a. Ultraviolet rays c. Infrared radiation

a. Its energy level are too close to each other b. Its energy level are too far apart c. It is too small in size d. It has a single electron

a. Unknown nature b. High energy electrons c. High energy photon d. Radioisotopes 10.

The electric P.E of an electron is an orbit at a distance from the positive charge ________ a. Ke /rn 2 c. –ke /rn

Hydrogen atom does not emit x-rays because __________

a. Continues spectra for atoms b. Discrete spectra for atoms c. Either continues for atoms d. No spectrum

The radiations emitted from hydrogen filled discharge tube show _________

2

When we excite some atoms by heat collusion or electrical discharge, they will ______ 14.

7.

b. Four d. Six

a. Bound spectrum b. Line spectrum c. Continuous spectrum d. Absorption spectrum

b) 10 S -9 d) 10 S

a. radiate electromagnetic energy with a continues distribution of wavelength b. Absorb particular wavelengths when white light is incident an them c. Radiate electromagnetic energy of discrete charactristic wavelength d. Emit either invisible or visible light

Total number of series in hydrogen spectrum is _____________ a. Three c. Five

Excited atoms return to their ground stat in __________ a) 10 S -6 c) 10 S

6.

11.

d. -1.51eV

b. Frequency d. All of the above

When X-rays are passed through successive aluminum sheets, what

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happens to their thickness?

27.

a. In increases b. It decreases c. Remains same d. Sometimes increase sometimes decreases 21.

22.

-10

a. 6.2 x 10 m -10 c. 3.11 x 10 m

The penetrating power of X-rays is comparable with that of __________ a. α - rays c. γ - rays

28.

b. β - rays d. All of above

24.

b. X - rays d. Infrared

30.

b. he/vc d. impossible to predict

The minimum wavelength of X-rays can further be reduced by _________

a. The illumination of the target metal by ultraviolet radiation b. The bombardment of the target by proton c. The bombardment of target by electron d. The absorption of Y-radiation by the target metal

UV radiation can be produced by __________

What is the velocity of a particle of mass m and de-Broglie Wavelength? a. h/mλ c. Mh/h

32.

b. 2h/mλ ½ d. (2hc/mx)

Wave like characteristic of electron is demonstrated by _________ a. Line spectrum of atoms b. Production of X-rays c. Diffraction by crystalline solids d. Photo electric effect

The characteristic X-rays spectrum is due to ____

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X-rays are diffracted by a crystal but not by a diffraction grating because ______

a. Heating the filament b. Ionization of atoms c. Electron excitation in the gas d. All the above

31.

a. Reducing the pressure of cooling the target b. Increasing the temperature of the filament c. Using a target element of higher atomic number d. Increasing the potential difference b/w the cathode and the target 26.

Maximum frequency in the spectrum from x-rays tube is directly proportional to the ___________

a. The ions in a crystal are well arranged b. The lines in a diffraction grating cannot reflect X-rays c. The perpetrating power of x-rays is which in a diffraction grating d. The wavelengths of x-rays are of same order of magnitude as the separation between atoms in a crystal

In an X - ray tube, electrons each of charge e are accelerated through V potential difference allowed to hit a metal target, the wavelength of the X-rays emitted is ____ a. hc/ev c. ev/h

25.

29.

Radiation produced from T.V. picture tube is _________ a. γ - rays c. Far infrared

-18 m

b. 9.1 x 10 -10 d. 4 x 10 m

a. Number of electron i.e. filament current b. The kinetic energy of incident electron c. The soft target which can easily emit electron d. All the above are correct

Quality of X-rays depends upon _______ a. Filament current b. Accelerating voltage c. Material of the target d. b and c

23.

The minimum wavelength of X-rays produced by the bombardment of electron on the screen of a T.V. set where the accelerating potential is 2.0 K,V will be ________

33.

Electron cannot exist in the nucleus, it is confirmed by observing that __________ a. At does emit Y-radiation b. Its size as compare to proton and neutron is

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very small c. No antiparticle of electron is present d. The velocity of electron must by very high according to uncertainly principle 34.

In normal state of energy, the incident high energy photons will be _________

36.

-4

37.

38.

44.

b. Normal state d. All the above

-5

b. 10 sec -8 d. 10 sec

47.

48.

49.

41.

50.

b. γ – rays d. none

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b. Normal light d. γ – rays

52.

b. Line spectrum d. none

Optical pumping exist in b. Laser d. None

A common He – Ne gas laser contain, He – Ne ration b. 80 – 20% d. None

The total energy of electron in an orbit around the nucleus is a. + ive c. zero

X – rays is also know as a. photon c. breaking radiation

b. 13.6ev d. none

Sunlight spectrum is

a. 85 – 15 % c. 70 – 30% 51.

b. He – spectrum d. None

Which one of the following is more coherent

a. X – rays c. Spectrum

Laser beam can be used to generate a. One dimensional images b. Two dimensional images c. Three dimensional images d. None of these

d. None

a. Discrete c. Continuous spectrum

The velocity of laser light is __________

RH 16

The ionization energy of H – atom is

a. X – rays c. Laser

Reflecting mirrors in laser is used to ________

-1

Bohr’s theory is failed to explain

a. – 13.6ev c. ±13.6ev

a. Less than ordinary light b. More than ordinary light c. Equal to ordinary light d. Different for different colors or frequency 40.

b.

a. H – spectrum c. Complex atoms spectrum 46.

b. He – Ne both d. Electrons of Ne

7

b. 1.0794 × 10 m d. None

The shortest wave length radiation in Bracket series has wavelength

16 RH c. 16 RH 45.

a. Further stimulation b. Lasing more c. For production more energetic laser d. All the above

39.

-1

a.

In He – Ne laser, the lazing action is produced by __________ a. Ne only c. Electrons of He

The value of Rydberg’s constant is 7

The meta stable state for an atom in laser light is _____________ a. 10 sec -3 c. 10 sec

b. large d. None

a. 1.0974 × 10 m -7 -1 c. 1.0974 × 10 m

In laser production, the state in which more atoms are in the upper state then in the lower one is called _________ a. Metal stable state c. Inverted population

Bremsstrahlung is phenomenon in which the rate of slowing down of electron is a. small c. very large

43.

a. Stimulated b. Absorbed c. Cause X-rays emission d. Cause laser production 35.

42.

b. – ive d. None

According to Bohr’s theory the outer orbit Electron has ________ energy than inner

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orbits.

62.

a. Greater c. Equal 53.

b. Smaller d. None of these

54.

3

b. Mari – curie d. Lane

65.

b. C.H.Towner d. C.H.Towner

The value of Plank’s constant is -34

b) De-excite d) None of these

J/sec 67.

Characteristic X – rays are the X – rays which have a) High energy photons b) Specific wavelengths c) Specific frequencies d) All of these

The total energy of electron in state n = α is

68.

When magnetic field is applied in the path X – rays , they will be moving in a) Straight line c) Parabolic path

X – rays can penetrate into a solid matter upto a) Few millimeter c) Few centimeter

b. – ive d. None 69.

61.

In LASER principle, a photon produce another photon by the process of

Laser is a device which can produce

a. + ive c. zero 60.

Bremsstrahlung are those in which radiations are produced of

a) Excitation c) Ionization

a. an intense beam of light b. Coherent light c. Monochoromatic light d. All

59.

b) – 13.6 eV d) 13.5 eV

a) Long wavelength b) Short wavelength c) Wavelength in X-rays region d) None of these 66.

b. 6.63 × 10 d. None

The quantized energy of first Bohr orbit of hydrogen atom is a) 13.04 eV c) 13.6 eV

6

-34

58.

64.

b. 10 12 d. 10

a. 6.63 × 10 J.sec -34 c. 6.63 × 10 sec/J

Line spectra is an example of a) Atomic b) Molecular c) Black body radiation d) None of these

The ratio of volume of an atom to the volume of nucleus is a. 10 9 c. 10

57.

b. Chadwick d. Stony

The idea of laser was first introduced in 1958 by a. Frank – white c. Dr. Gilbert Young

56.

63.

X – rays was discovered by a. Bacquerel c. Roentgen

55.

a) Atomic b) Molecular c) Black body radiation d) None of these

The name of electron was suggested by a. Rutherford c. Thomson

Continuous spectra is an example of

b) Several millimeter d) Several centimeter

Computerized axial tomography (CAT-scanner) is a system in which X – rays are a) Maximum through the subject b) Minimum absorptions through the subject c) Depending upon the subject d) None of these

b) Circular path d) None

With the help of laser beam we can produce 70. a) Fusion reaction b) Holograms c) Fragment of kidney stone d) All of these

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X – rays can cause cancer in living cells due to radiation exposure which is a) Small c) Excessive

b) Large d) None of these

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In Laser a Meta-stable state is a) An excite state b) In which an electron is usually stable -3 c) In which an electron reside 10 sec d) None of these

72.

The Meta-stable state of Helium and Neon is a) Different c) Nearly identical

73.

b) Identical d) None of these

Laser beam can be used for a) Wilding of detached retinas b) Destroy tissues in a localized area c) Sealed off capillaries for prevention of disease d) All of them

74.

In Balmer series the shortest wavelength radiations have wavelength equal to

 RH   4  RH c)   9 a)

75.

 m 

b)

 4   RH

 m 

d)

(9 R H ) m

The longest wavelength radiations in Braket series have wavelength equal to

25 RH 16 135 c) 27 R H a)

76.

  m 



b)

16 RH 25

d) None

Chapter 21 NUCLEAR PHYSICS

The wavelength of X – rays produced due to declaration of electrons is

V e m h c)   V e a)



he V e V e d)   h b)

1.

In nucleus of uranium the number of neutrons will be ___________



a. b. c. d. 2.

During fusion of hydrogen into helium _______ a. b. c. d.

3.

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92 235 143 Different for different isotopes

Energy is absorbed Energy is released Mass is increased due to energy absorption Mass is reduced due to energy absorption One a.m.u is equal to _________

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Visit for more educational notes -27

a) 1.66 x 10 kg -20 c) 1.66 x 10 kg

https://www.alqalamcoachingcenter.com/ c) Self disintegration property d) Both a and c

-25

b) 1.66 x 10 kg d) All of above 12.

4.

Energy liberated when one atom of U-235 undergoes fission reaction is ______

According to which one of following law, the density of atom is uniform ? a) J.J. Thomson c) Bohr’s Model

a) 200 Mev c) 30 Mev

b) Rutherford’s Model d) All of above laws 13.

5.

For chain reaction to buildup, the size of the radio active target should be ______ a. b. c. d.

6.

Transuranic elements have atomic number ____ a) Greater than 72 c) Greater than 92

90 Greater than the critical size Less than the critical size Equal to critical size

14.

Nuclear force exist between a) Proton – proton c) Neutron – Neutron

15.

b) Meson d) Quartz

a. b. c. d. 16.

6

12

b) 1590 x 10 d) Never

years

Binding energy of nucleus Packing fraction Average energy of nucleus All of above are one & same thing

Tick the correct statement a) b) c) d)

Half life of Radium is 1590 years. In how many years shall the earth loss all his radium due to radioactive decay ? a) 1590 x 10 years 25 c) 1590 x 10 years

17.

Moderator slow down the neutron Moderator bring the neutrons to rest Moderator absorb the neutron Moderator reflect the neutron The bombardment of nitrogen with α - particles will produce ________

a) Neutron c) Electron

9. Which one of the following radiation possesses maximum penetrating power?

18.

-12

a) b) c) d) 11.

19.

a) Spontaneous activity b) Chemical property

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Radioactive decay obeys which one of the following data? a) N = Noe xt/2 c) N = Noe-

Can exist inside the nucleus Cannot exist inside the nucleus Can exist both inside and outside the nucleus Don’t know

Radioactivity is a ______________

-11

b) 10 m -14 d) 10 m

-λt

Electrons

b) Proton d) Positron

Diameter of an atom is approximately _______ a) 10 m -10 c) 10 m

a) α - rays b) β - rays c) γ - rays d) All have equal penetrating power 10.

b) Proton – Neutron d) All of the above

Mass defect per nucleons is _________

b) Antineutron d) All of above

Neutron and proton are commonly known as ____________ a) Nucleons c) Boson

8.

b) Greater than 82 d) Greater than 102

Antimatter consists of _____________ a) Antiproton c) Positron

7.

b) 40 Mev d) 20 Mev

20.

xt

b) N = Noe xt d) No = N(Ie )

Average energy required to remove one nucleon from the nucleus is called _____ a) b) c) d)

Binding energy per nucleon Energy of decay Destruction energy All of above

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Visit for more educational notes 21.

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Fission chain reaction in a nuclear reactor can be controlled by introducing ________ a) Iron rod c) Cadmium rods

22.

226

30.

An α - particle is emitted from 88Ra , what is the mass and atomic number of the daughter nucleus?

b) Graphite rods d) Platinum rods

Which one of the following possesses maximum velocity?

a. b. c. d.

a) α - rays b) β - rays c) γ - rays d) All of the above have same speed 23.

31.

Charge on an electron was determine by ______ a) Ampere c) Milliken

24.

b) Maxwell d) Thomson

Charge on neutron is _____________ a) b) c) d)

25.

32.

-19

+1.6 x 10 c -19 -1.6 x 10 c Zero No definite charge

a) b) c) d)

A particle having the mass of an electron and the charge of a proton is called a) Antiproton c) Gamma rays

26.

a) b) c) d)

33.

b) Positron d) Photon

Mass Number 224 220 222 226

Atomic Number 84 80 86 87

The unit of Radioactivity “Curie” is equal to ___________ 9

3.74 x 10 disintegration per sec 10 3.70 x 10 disintegration per sec 10 3.55 x 10 disintegration per sec 10 3.60 x 10 disintegration per sec During fission process, a large amount of _____________ Heat energy is released Nuclear energy is released Chemical energy is released Light energy is released In liquid metal fast breeder reactor, the type of uranium used is _______ 235

a) 92U 234 c) 92U

238

b) 92U 239 d) 92U

Mass of neutron is ____________ -13

a) 1.67 x 10 Kg -31 c) 9.1 x 10 Kg

34.

-27

b) 1.67 x 10 Kg -19 d) 1.67 x 10 Kg

Radioactive materials can be identified by measuring their_______

a) Hardness c) Mass

27.

Nuclei having the same mass number but different atomic number are ______ a) Isotopes c) Isotones

28.

35.

b) Isobars d) Isomers

a) Molecules c) Elements 29.

b) Ions d) Isotopes

36.

Sum of the masses of constituent nucleons as compared to the mass of the resultant nucleus is _______ a) b) c) d)

Smaller Greater Same Some times smaller some times greater

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If one or more of the neutrons emitted during fission can be used to build up further fission then the reaction is self sustained and is known as ________ a) Fission reaction c) Chain reaction

A mass spectrograph sorts out _______

a) b) c) d) 37.

b) Density d) Half life

b) Fusion reaction d) Chemical reaction

Pair production takes place in the vicinity of heavy nucleus so that __________ Net energy is conserved Net charge is conserved Net momentum is conserved All of the above During an encounter with an atom α - particle knocks out _______

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Visit for more educational notes a) Protons c) Neutrons 38.

46.

b) Carved d) Elliptical

47.

Which one of the following radiations are suitable for the treatment of an infection in the interior body?

40.

b) β - rays d) X - rays

Geiger counter is suitable for ______

a) Fast counting c) Slow counting

49. b) Strontium – 90 d) Nickel – 63

42.

Sterilizations of surgical instrument, medical supplies and bandages can be done by exposing them to a beam of _________

50.

51.

b) +2 d) -1

52.

a) b) c) d)

53.

Through direct collision Through electrostatic attraction Through electrostatic repulsion All of above

The most useful tracer is ________ a) Sr -90 c) Ca -41

b) α - rays d) γ - rays 55.

a) b) c) d)

b) β - rays d) Neutron

T.V. sets and microwave oven emit ______ a) X - rays c) β - rays

45.

b) Range d) Limit

Which one of the following possesses greater penetrating power? a) α - rays c) X-rays

54. 44.

b) Aerosol spray d) All of above

Average distance covered by α - particle in air before its ionizing power ceases is called its __________

a) Trajectory c) Firing level B-particle ionizes an atom ________

b) Charge d) Momentum

CFC is used in ____________

a) Refrigerator c) Plastic foam industry

Charge on α - particle is _________

b) Barium Palatino cyanide d) All of above

Pair production cannot take place in vacuum as ______ is not conserved

a) Energy c) Mass

α - rays β - rays γ- rays ‘b’ & ‘c’ have equal antiseptic properties

a) +1 c) -2

43.

b) Extremely fast counting d) All situations

A α - particle can produce fluorescence in ___________

a) Zns c) Calcium tunzstate

a) b) c) d)

b) 100 times more d) 10 times less

Various types of cancer are treated by ___________ a) Cobalt 60 c) Carbon 14

41.

b) α - particle source d) Neutrons source

The penetration power of β - particle as compared to a-particle is_______

a) 10 times more c) 100 times less 48.

a) α - rays c) γ - rays

Strontium -90 is used as _________

a) β - particle source c) γ - particle source

The path of B-particle is_________ a) Rectilinear c) Zigzag or erratic

39.

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b) Electrons d) Nothing

A β - particle in a single encounter _______ Loses a small fraction of its energy Loses most of its energy Loses no energy at all Loses energy at all

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γ - rays are electromagnetic waves like ____________ a) Normal light c) Micro waves

56.

b) I -131 d) C -14

b) Heat waves d) X - rays

Charge on B-particle is __________

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Visit for more educational notes a) +1 c) +2 57.

a) b) c) d) 59.

a) b) c) d) 60.

Strong nuclear force a) Increase with magnitude of increasing charge b) Decreases with magnitude of increasing charge c) Is independent of charge d) None

b) Massless d) All of above

B-particle ionizes an atom ________

66.

X A  X      .......  Q Z 1

a) Neutrino c)  - particle

B-particles possess greater penetration power then that of a-particle due to its ____________ Smaller ionization power Energy is not conserved Neither greater nor smaller ionization power Same ionization power

67.

68.

b) γ - rays d) IR-rays

b) 33 d) 39

Marie Curie and Pierre Curie discovered two new radioactive elements which a) Uranium and Polonium b) Polonium and Radium c) Radium and Uranium d) Uranium and Plutonium

69.

The half of uranium – 238 is 8

a) 1.67 × 10 years 8 c) 4.5 × 10 years

A device for producing high velocity nuclei is ___________ b) Linear acceleration d) Wilson cloud

70.

Which one of the following will be better shield against γ - rays?

a) Ordinary water c) Lead 63.

64.

b) Heavy water d) Aluminum

b) β - rays d) γ – rays

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73.

b) Very easily d) None of these

Neutron interact with materials containing hydrogen atoms and knock out a) Electron c) Photon

b) 5 rem per week d) 3 rem per week

Radiations are used for the treatment of skin of a patient is __________ a) α - rays c) X - rays

72.

b) Straight d) None of these

 - particles can be deflected by collisions than the  -particles is a) Difficult c) Easily

The maximum safe limit does for persons working in nuclear power station are __________

a) 1 rem per week c) 4 rem per week

71.

9

b) 3.3 × 10 years 9 d) 4.5 × 10 years

The  - particle ionizes the particles in its way and adopt the path which is a) Curved c) Zig – Zag

62.

b) Antineutrino d) None

Both Xenon and Cesium each have isotopes a) 12 c) 36

Pair production can take places only with ______________

a) Cloud chamber c) A mass spectrograph

Complete the reaction Z

Due to electrostatic force of attraction Due to electrostatic force of repulsion Due to direct collision Due to gravitational force

a) X-rays c) UV-rays 61.

65.

Why γ - rays are used to kill bacteria, to sterilize surgical equipments etc?

a) Chargless c) Highly penetrating 58.

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b) -1 d) -2

b) Proton d) None of these

Neutron produce ionization by knocking out proton which is a) Direct ionization c) Both

b) Indirect ionization d) None of these

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

a) 1 ~ 5 mm of lead c) 5 ~ 10 mm of lead 75.

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- rays are absorbed by a sheet of

Tracks obtained by Chamber is

a) 1000 C o c) 1200 C

b) 1 ~ 10 mm of lead d) None of these

85.

77.

87.

The dead time of Geiger Muller counter is of the order of a) Micro second b) Miilli second c) More than millisecond d) None of these

79.

88.

As the solid state detector absorbs so less energy of the incident particle and junction become from surface. So it is called the detector as a) Surface contact c) Surface dependent

91.

The solid state detector operated at a) Low c) Very High 235

81.

The breakage of

U produces the fragments as

92.

b) Muons d) All of these

The charges on the quarks are a) One unit c) Fraction

b) High d) None of these

b) Neutrons d) All of these

Lepton’s particles which experience no strong nuclear force are a) Electrons c) Neutrinos

80.

b) Leptons d) All of these

Hadrons are the particle included a) Protons c) Mesons

90.

b) Surface barrier d) None of these

b) Protons d) None of these

Subatomic particles are divided into a) Photons c) Hadrons

89.

b) Heart d) Brain

Radio isotopes can be made easily by bombardment with a) Electrons c) Neutrons

b) Self quenching d) None of these

b) Blindness d) All of them

Neutrons are particularly more damaging to a) Legs c) Eyes

The quenching of gas by a quenching gas is called a) Quenching c) Forced quenching

78.

b) 0.1 mm of Hg d) None of these

86.

b) Fast neutron d) None of these

Ultraviolet radiation cuase a) Sum burn c) Skin Cancer

The mixture of gas filled in a Geiger-Muller tube at atmospheric pressure at about a) 0.01 mm of Hg c) 10.00 mm of Hg

Plutonium can be fissioned by a) Slow neutron c) Very slow neutron

 - particles in Wilson Cloud

a) Strong Continuous b) Discontinuous, not straight thin c) Weak and no definite tracks d) None of these 76.

84.

o

b) 1100 C o d) 1300 C

b) Half unit d) None of these

Meson is made from

92

a) Kr and Ba c) Xe and Sr 82.

a) A pair of quarks b) A pair of anti quarks c) A pair of quarks and anti quarks d) None of these

b) Sn and Mo d) All of them

The fuel / fuels used in the reactor are nowadays 93. a) Plutonium – 239 c) Uranium – 235

83.

b) Uranium – 233 d) All of these

Fission nuclear reaction leads to a _____ stability. a) Lesser c) Medium

b) Greater d) None

The temperature of the core of the reactor rises to about

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Visit for more educational notes 94.

a) 25% c) 7.5% 95.

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If a radioactive isotope of silver have a half life of about 7.5 days. After 15 days the remaining isotope of its original is

A nuclide

b) 50% d) 15% 86

R 220 decays to a new nuclide by two

 -emissions, the nuclide S is a)

84

S 212

b)

c)

80

S 220

d) None

82

S 212

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51