Physics-part-2.pdf

CHAPTER # 12 ELECTRO STATIC 1.

One coulomb is that unit of charge which when placed at 1m form an equal and similar charge repels it with a force a) 5 X 109 dyn c) 9 x 109 dyn

2.

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

3.

b) Direction d) All of them

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 a) 3 N c) 10 N

11.

b) 1:6 d) 6:1

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

10.

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

9.

b) J.J. Thomson d) Einstein

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

8.

b) Insulators d) S. conductors

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

7.

b) 4.8 x 10-10 ergs d) None

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

6.

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

One electron volt is a) 1.6 x 10-12 ergs c) 300 ergs

5.

b) 1 state coulomb d) None

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

4.

b) 5 x 109 N d) 9 x 109 N

b) 5 N d) 0.3 N

Unit of electric flux is

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a) V.m c) V.m2 12.

b) N/C d) N2/C2

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

13.

b) Curved surface d) Closed surface

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

14.

b) Heating d) By rubbing

Coulomb’s law is only applicable for a) Big charges c) Point charges

15.

b) Small charges d) Any charges

The force per unit charge is known as a) Electric flux b) Electric potential c) Electric intensity d) Electric current

16.

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

17.

A basic technique when applying gauss’s law is to a. b. c. d.

18.

Assume the field is constant in direction Assume the field is constant is magnitude Assume the field is constant in both magnitude and direction Construct and imaginary surface about the charge

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

19.

b) Electric flux d) None

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.

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

21.

The energy stored in the capacitor is a) ½ CV2 c) ½ QV2

b) ½ C2 V d) ½ Q2V

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22.

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

23.

b) 100 J d) 400 eV

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

24.

b) Double d) None

The electric potential at a point of distance 1 m from 2 uc charge is a) 1.8 x 106 V c) 1.8 x 104 V

25.

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

26.

b) 1.8 x 106 N/C d) 1.8 x 105 V

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

The area of plates of 1 farad capacitor separated 8.85mm placed in the air is a) 109m2 c) 10-9m2

27.

28.

b) 05m2 d) 10-15m2

The equation for the stokes law is a) " 6∧ηγ

b) " 6∧ηγ

∨

c) 6 rv

d) " 8∧ηγ

∨

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

29.

b) D.C d) None

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

30.

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

31.

b) Spherical surface d) None

One giga electron volt a) 106 ev c) 1012 ev

32.

b) Electro dynamics d) Electronics

b) 109 ev d) 1015 ev

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

b) Masses d) Medium

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33.

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

34.

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

35.

b) Dielectric d) Medium

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

36.

b) J.J. Thomson d) None

Electricity Cell Charging and discharging of capacitor None

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

37.

When capacitors are connected in parallel the net capacitance will a) Increase c) Constant

38.

Storing energy Increasing resistance Decreasing resistance None

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

42.

b) Weber d) c2/N.m

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

41.

b) 4:1 d) 1:2

S.I unit of permittivity of free space is a) Farad c) c2/N.m2

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

39.

b) Dark d) None of these

b) 1990 uF d) None

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

Magnetization Electrification Electrostatic induction Electromagnetic induction

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43.

The field inside the hollow conductor will be a) Zero c) E = kq/r2

44.

One volt is a. b. c. d.

45.

A dielectric An equipotential surface Polarized None

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

47.

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

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.

46.

Radius of sphere Surface area Magnitude of charge None of these

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

48.

b) Hennery d) Coulomb

Potential gradient is defined as

ΔE a." ΔV Δr c. " ΔV 51.

b) Electric force d) Potential field

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

50.

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

49.

b) Greater than zero d) Infinite

ΔE b. " ΔV ΔV − d. " Δr −

Large CR (Time constant) value has a. Small time constant

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b. Large time constant c. Equal time constant d. None of these 52. A Capacitor of 2µF is connected with a battery of 12 Volts, the charge stored in capacitor a. 2.5 × 10 -5C c. 2.4 × 10-5C

b. 2.4 × 10-6C d. 2.4 × 10-6C

53. An electric field can deflect a. Neutron c. " γ – rays

b. x – rays d. α – rays

54. The relative permittivity " ∑ r for germanium is a. 16 c. 18 55.

b. 17 d. 22

Xerography means a. Type writing c. Dry writing

b. Wet writing d. None of these

56. A 25eV electron has a speed of a. 2 × 106m/sec c. 5 × 106m/sec 57.

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

58.

b. 3 × 106m/sec d. 4 × 106m/sec

b. Decrease d. None of these

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

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

b. Force Law d. None

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60.

The ratio of Cvac and Cmed is equal to

1 b. " Σr 1 d. " Σo

a. " Σr

1 c. " Σ 61.

The ratio of the force between two small spheres with constant charges A) in air, B) in a medium of dielectric constant K is a) K2 : 1 c) K : 1

62.

The force of proton in electric field of magnitude 106 N/c is a) 1.6 × 10-15N c) 1.6 × 1013N

63.

b) 1.6 × 109N d) 1.6 × 1013N

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) " πR

2

/E c) " 2πR / E 2

64.

b) 1 : K d) 1 : K2

b) Zero d) " 2πR

2

E

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

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

66.

How many electrons are in one Coulomb? a) 6.2 × 10-23 c) 1.6 × 10-19

67.

b) 6.2 × 10-21 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

68.

b) System of units d) a & b

b) 4N d) 8N

Selenium is an a) Insulator c) Semiconductor

b) Conductor d) Photoconductor

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69.

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

70.

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

71.

qvd m a) " mgd g= v c) "

74.

b) 1038 d) 1042

σ 2 ∈! b) "

σ ∈ r c) " !

σ 2 ∈!r d) "

Of the following quantities, the one that is vector in character is an electric b) Field d) Potential Difference

Dielectric has the charge of the type inside it b) Static charge d) None of these

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.

d) None

σ ∈ a) " !

a) Moving charge c) Both a & b 76.

b) "

qvd g

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

a) Charge c) Energy 75.

q=

The ratio of electrostatic force to the gravitational force between them is of the order of a) 1036 c) 1040

73.

b) Electron d) Neutron

The charge determined by the Milikan’s experiment is

q=

72.

b) 1.9KV d) 0.15KV

b) F/4 d) 2F

The dimensions of relative permittivity are a) [A2T4ML-3] c) [ML3A2T2]

b) [ML-3A2T4] d) None

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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

79.

d b) " 2 d

c) " 2 d d) " 2 The ratio of instantaneous charge and maximum charge on plates of capacitors at t = RC is a) 36.8% c) 20%

b) 63.2% d) 30%

CHAPTER # 13 CURRENT ELECTRICITY 1) If the length and diameter of conductor is double, the resistance is a) Remain same c) Half

b) Double d) Four time

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

ΔR R ΔΤ a. " o R1 − R2 R ΔΤ c. " 1

R2 − R1 R ΔΤ b. " 2 R2 − R1 R d. "

3) The reciprocal of resistivity is called

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a) b) c) d)

Resistance Conduction Conductivity None

4) One coulomb per second is equal to 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 8) The drift velocity of electron at 0oC is a) b) c) d)

zero Maximum 1 cm/sec 10 cm/sec

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

Mechanical energy Electric energy Magnetic energy None

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

2Ω 110 Ω 0.5 Ω 20 Ω

11) The heating effect of current utilized in a) Iron b) Tube light

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

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

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

Conductors Transistors Diodes Electric Areas

14) Through an electrolyte electric current is passed due to drift of a. b. c. d.

Free electrons Positive and negative ions Free electrons and holes Protons

15) The e.m.f. of two cells can be compared by a. b. c. d.

AVO meter Voltmeter Potentiometer Galvanometer

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

Galvanometer Wheat-stone bridge Voltmeter None

17) At null point the current through the galvanometer is a) b) c) d)

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 a) b) c) d)

102 J 6 x 102 J 6 x 103 J 6 x 104 J

19) The unit of conductivity is

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a. b. c. d.

Ω. M (η.m)-1 Ω.m-1 None

20) When the bulb is turned on, ohm’s law is applicable a) b) c) d)

Yes No May or may not None

21) In series circuit the net resistance is a. b. c. d.

Increase Decrease Remain constant None

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

I2 Rt IR2t IRt2 V2/R

23) The graph b/w V and I in case of ohm law is a) b) c) d)

Parabolic Curve Slope Straight line

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

Finite Infinite Zero Changes with material

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

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

26) The S.I unit of e.m.f. is same as a. b. c. d.

Work Energy Power Voltage

27) The main type of resistors are

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a. b. c. d.

Two Three Four Five

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

Wires Terminals Color Spots

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

2 6 8 10

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

Greater Less Greater-less None

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

20000 24000 25000 None

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

± 2% ± 4% ± 5% ± 6%

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

Resistance Rheostat Amplifier None

34) A heat sensitive resistor is called a. b. c. d.

Amplifier Diode Thermistor Conductor

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35) The temperature co-efficient of thermistor is a. b. c. d.

Positive Negative Zero None

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

Voltage Resistance Temperature Heat

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

Network Simple circuit Complex circuit None

38) The circuit who has more than one voltage source is called a. b. c. d.

Network Simple circuit Complex circuit None

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

1st law 2nd law 3rd law 4th law

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.

40 5 20 2.5

42) The unit for the consumption of electrical energy commonly used is

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a. b. c. d.

Joule Watt sec K. watt. hr Watt. hr

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

24000 J 48000 J 144000 J 14400 J

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

P.d " α length P.d " α resistance P.d. " α area None

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

High power High voltage High current Over heating

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

Positive Negative Zero None

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

Electro late Electrolysis Electro-conductor None

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

Resistively Conductivity Temperature co-efficient None

49) Kirchoff’s 1st law is also called law of conservation of a. Charge b. Mass

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c. Energy d. None 50.

The resistivity of copper in Ω.m is a. 1.52 × 10-8

51.

c. 1.56 × 10-8

d. None

c. Manganin

d.

c. Resistance

d. None

The wire used in Rheostate is made from

Tungston 52.

a. Constanton

b. Nichrome

An ideal voltmeter would have an infinite

of these 53.

b. 1.54 × 10-8

a. Current

b. Voltage

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

54.

If three resistances of equal resistance R are connected in parallel, the net resistance will

a. 3R

55.

R b. " 3

3 c. " R

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

57.

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

58.

b. 1.83 A d. 2.83 A

b. Carbon resistance d. Tungston wire

Magnetic effect of current is utilized in a. Iron b. Thermocouple c. Measurement of current d. None

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59.

The unknown e.m.f can be determined by

a. " "

Ex =

61.

R E r

3 Ohm a. " 4

4 Ohm b. " 3

c. 4 × 3 Ohm

A source of 200V provides a current of 10.0 Amperes to a house. The power delivered by the source is b) 40 watt d) 200 watt

When the battery is connected at its ends, an electric field is set up at b) Every point d) All of them

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

67.

d. 4 + 3

b) 20W d) 40W

a) Nature c) Physical state 66.

d.

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

a) Its ends c) Middle

65.

l L

b) 4" ρ d) " ρ / 4

a) 20 watt c) 2000 watt 64.

c. "

Ex = E

The resistivity of a material is " ρ . If the area of cross-section of material is doubled and length is halved then the resistivity of material is:

a) 10W c) 30W 63.

L l

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

a) " ρ c) 2" ρ 62.

b. "

Ex = E

R lE r

60

Ohm

Ex =

The resistivity "

ρ of Aluminium in Ωm is

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a) 2.59 × 10-8 c) 2.63 × 10-8 68.

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

69.

b) 0.5 × 10-8 d) None of these

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

70.

b) 2.60 × 10-8 d) None of these

b) 8 d) 5

A zero ohm resistor is indicated by a) A single silver colour band b) A single black band c) A silver black band d) None of these

71.

Thermo couples convert heat energy into a) Mechanical energy c) Electrical energy

72.

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

73.

R E r a) " l Ex = E L c) "

d) "

Ex =

L l

R lE r

b) No d) None of these

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.

b) "

Ex = E

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

75.

b) An ammeter d) All of them

The unknown emf can be determined and given by

Ex =

74.

b) Chemical energy d) None of these

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

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77.

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 b) " 2 1 d) " 4

a) 1

1 c) " 3

CHAPTER # 14 ELECTROMAGNETISM 1.

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

2.

Iron Steel Moving charge None of these

The poles of magnet are similar to a. Geo poles b. Opposite to geo poles c. Perpendicular to geo poles d. None

3.

A moving charge is surrounded by a. b. c. d.

4.

A photon while passing though a magnetic field are deflected towards a. b. c. d.

5.

North pole South pole Are ionized None

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

6.

2 fields 3 fields 4 fields None

Diamagnetic Paramagnetic Ferromagnetic Non-magnetic

Magnetism is related to

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a. b. c. d. 7.

!

if the angle b/w " v and B is zero then magnetic force will be a. b. c. d.

8.

Yes No Some Time None

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

13.

Electric field Magnetic field Magnetic field intensity Electric field intensity

It is possible to set a charge at rest into motion with magnetic field a. b. c. d.

12.

Tesla Weber Joule Newton

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

11.

A helix A circle Straight line Ellipse

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

10.

Max Min Zero None

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

9.

Stationary charges Moving charges Stationary and moving charge Law of motion

Away from you Towards you Clock wise Anti clockwise

The shape of magnetic field around a long straight current carrying wire is a. Electrical b. Squire

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c. Varies with current d. Circular 14.

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

15.

The flux through an area of 1 m2 in x -y plane in a magnetic filed of 1T directed along Z -axis will be a. b. c. d.

16.

0o 60o 90o 180o

The Weber and Maxwell are unit of measure of a. b. c. d.

20.

Electric flux Torque Magnetic flux Force

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

19.

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

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

18.

Zero 1 wb 0.5 web None

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

17.

104G 10-4G 106G 10-6G

Conductance Electric current Magnetic flux Electric flux

One weber is equal to a. b. c. d.

N.A2/A N.m2/A N.A/m N.m/A

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21.

An electron moves at 2x102m/sec perpendicular to magnetic field of 2T what is the magnitude of magnetic force a. b. c. d.

22.

The waveform of sinusoidal voltage, its frequency and phase can be found by a. b. c. d.

23.

T.m/A T.m2/A T.m/A2 None

The value of "

π 4π 4π 4π

µ o is

a. 4

x 10-6

b.

x 10-7

c. d. 28.

Circular path Rectangular path To any path None

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

27.

H. orested Ampere Weber Henry

Ampere’s law is applicable to a. b. c. d.

26.

Maximum Minimum Zero None

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

25.

CRO Diode Transistor Radio

The force on a charge particle moving parallel to magnetic field is a. b. c. d.

24.

1 x 10-6N 6.4 x 10-17N 3.6 x 10-24N 4 x 106N

x 10-8 x 10-9

The magnetic induction of solenoid is

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b.

! µ o NI ! µ o NL

c.

! µo N

d.

None

a.

29.

A solenoid of length 500m is wonded into 100 turns. A current of 10 A flows in it, the magnetic field intensity is a. 20 "

µo

b. 200 "

µo

c. 2000 " d. None 30.

When charge particle enters in the uniform magnetic field, the magnetic force will be balance by a. b. c. d.

31.

Electric force Magnetic force Centripetal force None

The frequency of cyclotron is given by

a. b. c.

d. 32.

µo

qb f = " 2πm qb f = " 2πrm qb f = " 2π qb ! mr

the e/m value of electron is a. 1.7588 x 1011 b. 1.75599 x 1012 c. 1.7588 x 109 d. 1.7559 x 1014

33.

F = Fe + Fm is a. Electric force b. Magnetic force

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c. Lorentz force d. None 34.

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

35.

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

36.

Two Three Four None

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

37.

Two Three Four Five

Electric Magnetic Phosphors None

The value of restoring torque in galvanometer is

= rθ b. " τ = cθ c. " τ = mθ a. " τ

d. None

38.

In the galvanometer the current is proportional to a. b. c. d.

39.

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

40.

Magnetic field Electric field Angle None

Ammeter Voltmeter AVO meter None

To find the shunt resistance we used equation

IgRg a. Rs = " I − Ig

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IsRg b. Rs = " I − Ig IgRs R − Ig c. Rs = " IsRs d. Rs = " I − Ig

41.

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

42.

AVO-meter is used to find a. b. c. d.

43.

Very large Very small Unaltered None

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

46.

Small resistance High resistance Infinite resistance None

an ammeter can be more sensitive if C/BAN is made a. b. c. d.

45.

Current Voltage Resistance All of above

An ideal voltmeter has a. b. c. d.

44.

Series Parallel Series or parallel None

Rs = Rg Rs < Rg Rs > Rg None

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

Iron Nickel Steel All of them

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47.

Ammeter and galvanometer a. b. c. d.

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

48.

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.

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

51.

web.m2 web.m-2 web.m None

Electric flux Magnetic flux Ampere law None

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

52.

The S.I unit of Magnetic Permeability is a. web/m2 c. web m/A

53.

c. Reactance

b. Current d. All of them

In C.R.O the anode are at positive potential with respect to cathode is a. very high c. low

56.

b. Specific resistor

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

55.

b. web A/m d. None of these

Shunt resistor is also called a. By pass resistor

54.

b. V.A/sec d. None

b. high d. very low

The e/m value for an electron is

4v a. " Br

Zv b. " Br

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d. None

2v 2 c. " B r 57.

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

58.

Radio TV Picture tube Transistor None

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

59.

Weaken it Strength it Reverse its polarity Demagnetize completely

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

60

0.1A 1A current sensitivity 1mA

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

61.

2v 2 2 d. " B r

106 Maxwell 108 Maxwell 1010 Maxwell none

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

62.

63.

b) Doubled d) None

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 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

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64.

The S.I unit of magnetic permeability is a) TmA-2 c) Fm-1

65.

b) TmA-1 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

66.

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

67.

b) Magnet d) None of these

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 a) " I Ig − Rg c) " V 69.

b) "

V − Rg Ig

I − Rg d) " V

Magnetic flux passing normally, through a unit area is called a) Magnetization b) Magnetic field intensity c) Magnetic flux density d) All of these

70.

The relation between Tesla ( T ) and Gauss (G) is given as a) 1T = 104G c) 1T = 10-4G

71.

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

72.

b) 1T = 106G d) 1T = 10-6G

b) Restoring couple d) None of these

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

v= a) "

2V m

v= b) "

3 Ve m

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v= c) " 73.

2V me

d) "

2 Ve m

The beam of the electrons is provided by a) Ionization of atoms c) Electron gun

74.

v=

b) Photoemission d) None of these

The resistance of a voltmeter should have a very high resistance a) It does not disturb the circuit b) It draws some current c) It same the galvanometer coil d) None of these

75.

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

76.

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

a) "

Rs = Rs =

c) " 77.

b) Diode d) Radio

V Rg I Ig I − Ig

Rs = b) "

Vg I − Ig

d) None

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 a) " 6π 10

−4

c) " 60π 10

−4

b) " 6π 10

−5

d) None

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CHAPTER # 15 ELECTROMAGNETIC INDUCTION 1.

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

2.

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

3.

Mass Energy Charge None

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

7.

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

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

6.

Heat energy Internal energy Steam energy None

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

5.

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. b. c. d.

4.

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

Magnetic field Electric flux Electric field None

The induced e.m.f. can also be increase by increasing a. Current b. Voltage

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c. No. of turns d. None

8.

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

9.

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

10.

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

If we increase the resistance of coil, the induced e.m.f. will be a. b. c. d.

12.

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

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

11.

Faraday’s law Lenz’s law Ampere law None

Increase Decrease Remain same None

The self-inductance may be defined by

−∈ a) L = " ΔΙ / Δt − ΔΙ / Δt ∈ b) L = " −∈ c) L = " Δϕ / Δt ∈ d) L = " Δϕ / Δt 13.

The mutual inductance b/w two coil is a. M = -" ∈ / ΔΙp

−∈ b. M = " ΔΙp / Δt c. M = -" ∈ / Δϕ / Δt d. None

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14.

Inductance are measured by a) Coulombs c) Volt

15.

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

16.

Max. current Min. current Half None

The self inductance of a solenoid is

a) L = " b) L = " c) L = " d) L = " 18.

Maximum Minimum negligble None

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

17.

b) Amperes d) Henry

µο n 2 µο n

λΑ !

λ2 Α 2 !

µο nlA 2 µο

2

nλ Α !

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.

½LI2 ½ L2 I ½ L2I2 None The energy stored in the inductor per unit volume is

ΙΒ 2 2µ 0 a. "

ΙΒ b. " 2 µo

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ΙΒ 2 d. " 4 µo

ΙΒ 4µ 0 c. "

21.

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

22.

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

23.

160 mJ 1.28 J 1.6 mJ None

Eddy current Hysteresis Electric resistance Inductance

The co-efficient of mutual inductance is equal to

& ΔΙp # ∈$ ! a. " % Δt " c. " ∈ ΔtΔΙp 24.

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.

26.

d. none

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.

& Δt # !! ∈ $$ ΔΙ p % " b. "

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.

2" π rad/sec

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b.

5" π rad/sec

c.

5 ! π rad/sec

d. 28.

None

The instantaneous value of A.C. voltage is a. V = Vo sin 2 " π ft b. V = Vo sin 2 ft c. V = Vo sing 2" π wt d. None

29.

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

30.

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

The induced e.m.f. in A.C. generator is

φ a. VBL sin " b. NESN sing " φ c.

NAB sin " φ

d. NIAB sin " φ 31.

In Pakistan the frequency of A.C. is a. b. c. d.

32.

50 Hz 100 Hz 150 Hz 220 Hz

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

33.

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

34.

Slip rings Commutators Slip – chip None

Attract each other Repel each other No effect None of these

The back motor effect exist in the a. Generator b. Mater

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c. A.C. Meter d. None

35.

The coil used in the generators is called a. b. c. d.

36.

Commutaters Slip rings Armature None

The back ward generator is called a) b) c) d)

37.

Electric mo0ter are used in a. b. c. d.

38.

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 Motor Transformer None

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

40.

Television Radar Tape recorder All of above

The back e.m.f. exist in the a. b. c. d.

39.

Electric motor A.C. generator Reverse generator None

Primary Secondary Middle None

In the actual transformer, the output is always

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a. b. c. d.

43.

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.

44.

Power loss Heating Both a and b None

To over come the eddy current, the core is a. b. c. d.

49.

Step up transformer Step down transformer For both None

The eddy current produced a. b. c. d.

48.

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

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

47.

Doubled Tripled Halved Same

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

46.

40 20 10 2

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

45.

Equal to input Less then input More than input None

Laminated with insulation With magnetic With plastic None

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

Small Large Zero None

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50.

To minimize the heating effect in the transmission lines a. b. c. d.

51.

High current low voltage in used High voltage low current in used Same voltage and current in used None

Load is a device which consume a. Mechanical energy b. Electrical energy c. Frictional energy d. None

52.

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

53.

A transformer is said to be efficient if a. Output voltage = Input voltage c. Output power = Input power d. Output energy = Input energy

54.

d. None of these

b. Output current = Input current

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

! 2

! 1

b. 1 : 2

! 1 ! 2 c. "

d. 2 : 1

a. "

55. 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

b. 0.3v d. 10v

56. 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

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57.

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

58.

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

59.

b) (106/µo)J d) None

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%

64.

b) DC circuits d) None

A solenoid of area of cross section 2.0cm2 and length 100cm stores energy. When current of 5.0A flowing in it produces B = 0.1T then the stored energy is a) (10-6µo)J c) (10-6/µo)J

63.

b. Self inductance d. Heating effect

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

62.

b. Zero d. None of these

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

61.

b. Soft iron d. Accelerating charge

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

60.

b. Effect in charging a battery

b) 400% d) None

In mutual induction, the mutual inductance of the two coils depends upon a) Number of turns b) Area of cross section of coil c) The distance between the two coils d) All of them

65.

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

66.

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

67.

b) Capacitor d) None of these

b) Current d) None of these

In an ideal transformer, the following factors are used

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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 68.

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

69.

The Jerks are created by the use of a) Commutator c) Torques

70.

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

71.

b) 2H d) 4H

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 a) 100V c) 300V

74.

b) 2 ms-1 d) 8 ms-1

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

73.

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-1

72.

b) Armature d) None of these

b) 200V d) 400V

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

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75.

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

CHAPTER # 16 ALTERNATING CURRENT CIRCUITS 1.

The A.C. e.m.f. can be represented by the wave form called a. b. c. d.

2.

Sinusoidal Cosine wave Tangent wave None

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

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a. b. c. d. 3.

The r.m.s. value of A.C current in a. b. c. d.

4.

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

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

6.

0.707 Io 0.707 Vo 0.708 Ro None

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

5.

Maximum Minimum Zero None

Resistors Capacitors Inductors All of above

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

8.

d) "

ω

2π

Volt Ampere Joule Ohm

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

10.

ω

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

9.

2π

b) " 2πT

Large Small Zero None

In case of capacitor, the voltage lage- behind the current by a. 90o

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b. 60o c. 30o d. 180o 11.

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

12.

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

13.

3184 3190 3140 3150

Zero Maximum Minimum None

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

ΔΙ Δt a. " Δϕ ∈= − L Δt c. " ∈= L

14.

The resistance of inductor is represented by

Half Same Double Triple

The average power dissipated in a pure inductor is a. b. c. d.

18.

b) XL d) None

If the frequency of A.C. is double inductor the reactance will be a. b. c. d.

17.

d. None

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

a) Xc c) RL 16.

ΔΙp Αt

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

15.

b. "

∈= L

Maximum Minimum Zero None

The device which is used for controlling A.C. without dissipation of energy is called a. b. c. d.

Inductor Capacitor Resistor Choke

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19.

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

20.

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

21.

Null vector Unit vector Phasor None

The combine opposition of resistor capacitor and inductor is called a. b. c. d.

23.

Clockwise Anti clockwise Remain stationary None

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

22.

Increases Decreases Remain same None

Reactance Resistor Impedance None

The S.I unit of impedance is called a) Joule c) Ampere

24.

b) Weber d) Ohm

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

R 2 + Xc 2

Ι R2 + X L

2

b. V = " c. V = IR d. None 25.

The impedance of RC – series circuit is

V a. R = " I V b. Z = " I Z c. V = " I d. None 26.

The magnitude of voltage in case of RL – service circuit

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a. V = I " b. V = I " c. V = IR d. None 27.

R 2 + XL2 R 2 + Xc 2

The average power in case of A.C. series circuit is b) P = VI cos" ϕ d) None

a) P = VI c) P = VI sin " ϕ 28.

In equation P = VI cos" ϕ , the factor cos " ϕ is called b) Cos" ϕ d) None

a) Cosine c) Power factor 29.

At what frequency will a 1H inductor have reactance of 500 ohms a) 80 Hz c) 40 Hz

30.

b) 60 Hz d) 20 Hz

In case of RLC series circuit the impedance of circuit is a. Z = R2 +

Xc 2 − X L

2

2

b. Z = " c. Z = " d. None 31.

R 2 + X L + Xc 2 R 2 + ( XL − Xc) 2

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

32.

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

33.

Resonance frequency Threshold frequency Non-frequency None

At resonance frequency the impedance of A.C series circuit is a. b. c. d.

35.

b) Zero d) Three

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

34.

b) Independent d) None of these

Maximum Minimum Can not explain by give data None

In parallel circuit of A.C. there will be maximum

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a) Power c) Impedance 36.

b) Voltage d) None

The electrical oscillators are used in a) Metal detectors b) Amplifier c) Diode d) None

37.

The current which is produce due to changing electric flux is called a. b. c. d.

38.

The fundamental requirement for the generation of electromagnetic wave is a. b. c. d.

39.

Displacement current Conduction current Eddy current None

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

The speed of light was found by formula

1 ∑ µo

o a) c = " π c) c = 2" rt

40.

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.

Frequency Modulation Amplitude Modulation No, effect None

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

42.

Amplitude Modulation Applied Metal Accurate Measurement None

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

44.

b) Capacitor d) None

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

43.

b) c = s/t d) None

Frequency Modulation Frequency Metal Frequency Member None

The process of combing the low frequency signal with high frequency radio-wave is called

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a) Modulation c) Rectification 45.

b) Amplification d) None

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

46.

b) F.M d) M.W

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

47.

b) 350.5v d) None of these

The types of modulations are a) One c) Three

48.

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

49.

b) Two d) Four

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

The angular frequency of resonance circuit is

1

50.

1

a) W = "

LC

b) W = "

c) W = "

LC

d) None

L C

Natural or Resonant frequency of an LC circuit is

1 ! 4π

LC 1

c) " 2π

LC

b) " 2π

1 d) " 2π

LC LC

51. What is the self inductance of a coil in which current changes at the rate of 4 A/sec.

52.

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

53.

an induced e.m.f of 2 volt is setup when

b. Choke d. None

An A.C choke is a coil consist of thick copper wire, wound closely over a a. Soft iron core b. Hard iron core c. Soft iron laminated core d. None

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54.

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

55.

b. High d. Maximum

The reciprocal of impedance is called a. Conductance c. Admittance

56.

b. Inductance d. None

Which one is prefer for transmission of radio signal. a. X – rays b. Infra red rays c. Larger than infra red d. Smaller than infra red

57.

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

58.

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

59.

d. A.F longitudinal waves

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

60. these 61.

a. One time

b. Two times

c. Four times

d. None of

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

62.

During each cycle A.C voltage reaches its peak value

b) ½ d) Not defined

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: a) V = VR + VL + VC b) V2 = VR2 + VL2 + VC2 2 2 2 c) V = VR + (VL – VC) d) V2 = VL2 + (VR – VC)

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63.

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

64.

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

65.

b) Large d) None of these

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

66.

b) Low cost d) None of these

b) Independent d) None of these

In an inductor the phase difference between the current and voltage is a) Current lags voltage by 90o b) Voltage lags current by 180o c) Current leads voltage by 90o d) None of these

67.

The combined effect a resistance R, an inductance L, a capacitance C is known as a) Resistance c) Impedance

68.

The condition of resonance reached when a) XC > XL c) XL = XC

69.

b) 45o d) 120o

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

71.

b) XL < XC d) None of these

The phase difference between coils of three phase A.C is a) 60o c) 90o

70.

b) Reactance d) None of these

b) Four d) Eight

Modulation is the process in which a) Amplitude is change b) Frequency is change c) Both a & b d) None of these

72.

The frequency of modulated carrier waves is lowest when signal amplitude is a) Maximum negative value b) Maximum positive value c) Amplitude zero d) None of these

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73.

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

74.

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

75.

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

76.

b) 40V d) 45V

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

B= a) "

B= c) " 78.

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

77.

b) 100 Ω d) 20 Ω

1 Δϕ B 2π r Δt µ !∈! Δϕ e × 2π r Δt

B=

1 Δϕ e 2π r Δt

B=

1 Δt 2π r Δϕ e

b) "

d) "

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

b) Maximum d) None

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CHEPTER # 17 PHYSICS OF SOLIDS 1.

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

2.

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

3.

b) Steel d) Copper

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

What are the dimensions of stress? a) MLT-2 c) ML-1T-2

4.

b) ML-2T-1 d) MLoT-1

Which one of the following physical quantities does not have the dimensions of force per unit? a) Stress c) Young’s modulus

5.

A rubber cord of cross-sectional area 2cm2 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.

6.

2 x 108 Nm-2 5 x 106 Nm-2 0.5 x 10-6 Nm-2 0.2x10-6 Nm-2

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 _____________ a) FL c) FL2/L

7.

b) Strains d) Pressure

b) ½ (FL) d) ½ FL2/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 c) YE2

b) ½ YE d) ½ YE2

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8.

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

9.

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_________ a) Stress/strain c) Stress x strain

10.

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

A uniform steel wire of length 4m and area of cross section 3 x 10-6 m2 is extended by 1mm by the application of a force. If the young’s modules of steel is 2x1011Nm-2, the energy stored in the wire is ____________ a) 0.025J c) 0.075J

b) 0.050J d) 0.100J

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 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 _________ 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.

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

b. Polymerization d. Subtraction

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15.

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

16.

b. Ductility d. deformation

The energy band occupied by the valence electrons is called ________ a. Energy state b. Valence band c. –ve energy state d. Conduction band

17.

The curie temperature is that at which ______ a. Semi conductor becomes conductors b. Ferromagnetic becomes paramagnetic c. Paramagnetic becomes diamagnetic d. Metal becomes super conductor

18.

A ferromagnetic will become fully magnetized at _______ a. High voltage A.C b. Low voltage A.C c. Alternating current at its peak value d. D.C current is peak value

19.

Coercion force is the force which opposes a. Demagnetization c. Extension

20.

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

21.

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

b. Cleavage d. Dislocation

The angular position of cells remains the same for a sample of a crystal this property is called a. Isotropy b. Cleavage c. Homogeneity d. The external symmetry of form

23.

The breaking of a crystal along definite direction is called

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a. Cleavage c. Isotropy 24.

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

25.

b. Homogeneity d. Clearage

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

26.

b. Symmetry d. Homogeneity

b. Nine corners d. Six corners

The band theory of solids explains satisfactorily the nature of a. Electrical insulators alone b. Electrical conductors alone c. Electrical semi conductors alone

27.

A vacant or partially filled band is called _____ a. Conduction band c. Forbidden band

28.

b. Valence band d. Empty band

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

29.

d. All of the above

b. Valence band d. Core band

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

30.

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

31.

b. Conductors d. Non-metals

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.

With increase in temperature, the electrical conductivity of intrinsic semi conductors ______ a. Decreases b. Increases c. Remain the same d. First increases, then decreases

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33.

Holes can exists in_________ a. Conductors c. semi conductors

34.

b. insulators d. all of the above

In a semi conductors, the charge carriers are __________ a. Holes only b. Electrons only c. Electrons and holes both d. All of the above

35.

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

36.

b. Negative d. Neutral

Very weak magnetic fields are detected by _____ a. Squids b. Magnetic resonance imaging c. Magnetometer d. Oscilloscope

37.

Energy needed to magnetic and demagnetize is represented by a. Hysterics curve c. Hysterics loop

38.

b. Hysterics loop area d. Straight line

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

39.

Minority carriers in N-type materials are a. Electrons c. Neutrons

40.

According to free electron theory the only energy possessed by electron is a. K.E c. Gravitational

41.

b. Protons d. Holes

b. P.E d. Electrical

The area under stress – strain graph is a. Power c. Momentum

b. Energy d. Impulse

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42.

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

43.

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

44.

Solid material that are brittle are a. Toughness c. Stiffness

45.

b. Ductility d. None

b. Ductile d. None

The temperature at which conductors lose its resistivity is called a. Supper temperature b. Kelvin temperature c. Critical temperature d. None

46.

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

47.

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

48.

b. Nitrogen d. All of them

Crystalline solids are also a. Metals c. Ceramics

52.

b. Copper d. None

Polymers have chemical combination with a. Carbon c. Hydrogen

51.

b. Kmaerling d. None

Examples of brittle substances are a. Glass c. Lead

50.

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

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

49.

b. Micrometer d. None

b. Ionic compounds d. All of them

Young’s Modulus for copper is

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a. 25 c. 100 53.

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

54.

b. Two d. Four

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

62.

b. No units d. None

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

61.

b. Copper d. All of them

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

60.

b. 650oC d. 750oC

The examples of diamagnetic are a. Water c. Antimony

59.

b. Toroid d. None

The curie temperature of Iron is a. 600oC c. 700oC

58.

b. More holes d. – ive charge

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

57.

b. Partially filled d. None of these

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

56.

b. Very close d. None

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

55.

b. 55 d. 110

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

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63.

A hydraulic press contains 0.25m3 oil of bulk modulus 5.0 × 107 Pa. The change in volume of oil when subjected to pressure increase of 1.6 × 107 Pa is a) – 8.0 × 10-4 m3 c) 2.0 × 10-4 m3

64.

b) 4.0 × 10-4 m3 d) 10-4 m3

The resistivities of conductors, semiconductors and insulators are of the respective orders of a) 108 Ω.m, 10-4 Ω.m b) 10-4 Ω.m, 104 Ω.m, 108 Ω.m c) 10-4 Ω.m, 108 Ω.m, 104 Ω.m d) 104 Ω.m, 10-4 Ω.m, 108 Ω.m

65.

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

66.

Crystalline solids are also a) Metals c) Ceramics

67.

b) Copper d) None of these

Semiconductor materials have the conductivities generally lies between a) 10-5 to 10-6 (Ω.m)-1 c) 10-7 to 10-3 (Ω.m)-1

73.

b) Elasticity d) None of these

Examples of brittle substances are a) Glass c) Lead

72.

b) Nitrogen d) All of them

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

71.

b) Molecules d) All of them

Polymers have chemically combinations with a) Carbon c) Hydrogen

70.

b) Fixed d) None of these

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

69.

b) Ionic compounds d) All of them

With the rise of temperature the amplitude of atoms a) Slow down c) Increases

68.

b) Anti parallel to B d) None

b) 10-6 to 10-4 (Ω.m)-1 d) None of these

The electrons occupying the outermost shell of an atom and the electrons occupying in the energy band are called

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a) Energy band c) Forbidden energy band 74.

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

75.

b) Very small d) None of these

Doping is the process in which the small amount of impurity is added into the pure semiconductor lattice in the ratio a) 1 to 103 c) 1 to 105

76.

b) Valence band d) None of these

b) 1 to 104 d) 1 to 106

The technological uses of super conductors are a) MRI b) Magnetic levitation trains c) Faster computer chips d) All of them

77.

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

78.

The combination of solenoid and a specimen of iron inside it make a powerful magnet called a) Horse shoe magnet b) Bar magnet c) Electromagnet d) 10-10 to 1018

79.

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

80.

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

81.

b) 1 leads B d) None of these

b) Coercive current d) None of these

The energy need to magnetize and demagnetize the specimen during the each cycle of magnetizing current is a) Value of current b) Value of demagnetizing current c) Value of magnetic flux density d) Area of the loop

82.

The strain energy density is given by

1 ( Stress × Strain) 2 a) " 1 U = ( Stress × Strain) 3 b) " U=

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c) " U

= Stress × Strain

d) " U = ( Stress × Strain) 83.

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

84.

b) Acceptor d) Extrinsic

What is the S.I unit of magnetic permeability? a) Ampere per meter b) Ampere meter c) Henry per meter d) Being a dimensionless number, it has no unit

CHAPTER # 18 1.

ELECTRONICS

A semi – conductor can be used as a rectifier because

a) It has low resistance to the current flow when

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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 input AC d) Either positive or negative half cycle of input AC 3. a) b) c) d) 4. a) b) c) d)

A bridge rectifier is preferable to an ordinary two diodes full ware rectifies because It uses four diodes Its transforms has no counter tap It needs much smaller transformer It has higher safety factor The color of light emitted by LED depends on Its forward biased Its reversed biased The amount of forward current The type of semi conductor material used

5.

A PN junction photodiode is

a) b) c) d)

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

6. a) b) c) d)

7.

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

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8. a) b) c) d)

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

9.

The current gain of a transistor is given by

IC I b. " B IB I d. " E

IC I a. " E IB I c. " E 10.

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

a) Is reversed c) Decreased 11.

b) Increased d) Stops

An op-AMP has

a) Infinite AV c) Zero Ro 12.

b) Infinite Ri d) All the above

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

a) 1000 c) 10-13 13. a) b) c) d) 14.

b) -1000 d) -10-6 A diode characteristic curve is a graph between

Current and time Voltage and time Voltage and current Forward voltage and reverse current A NOR Gate is ON only when all its input are a) ON c) Positive

15.

A logic gate is an electronic circuit which a. b. c. d.

16.

b) OFF d) High

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

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

Positive voltage Higher voltage level Zero voltage level Lower voltage level

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17.

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

18.

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

An XOR gate produces an output only when its two inputs are a) High c) Different

19.

An AND Gate a. b. c. d.

20.

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.

21.

b) Low d) Same

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

A NOR gate is ON only when all its input are a) ON c) Positive

22.

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

23.

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

A changing electric flux develops in the surrounding space a. b. c. d.

25.

Sound waves Water waves Light waves Waves along a stretched string

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

24.

b) OFF d) High

An electric field A magnetic field An electromotive force Gravitational field

EM waves transport

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a) Matter c) Energy 26.

Waves emitted from the antenna are a. b. c. d.

27.

Stationary Longitudinal Transverse All of the above

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

29.

Longitudinal waves EM waves Sound waves Radio waves

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

28.

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

EM waves have frequency of the range of a. 104Hz c. 106Hz

30.

b) Wavelength d) Charge

b. 105Hz d. 1012Hz

Maxwell derived mathematically that velocity of EM-waves is

a. "

I Σo

b. "

I uo

d. "

I Σ o uo

∑o c. "

31.

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

32.

uo

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.

b) Majority carriors d) Electrons

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

b) A detector d) A rectifier

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34.

A photo diode is a semi conductor device usually made from a) Bismuth c) Antimony

35.

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

36.

Photo diodes LED Solar cell Photo voltaic cell

The specially designed semi conductor diodes used as indicator lamp in electronic circuit are a) Photo diodes c) LED

37.

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

The thickness of depletion region is of the order of a) 10-7 cm c) 10-5 cm

39.

b) Solar cell d) Photo voltaic cell

The term transistor stands for a. b. c. d.

38.

b) Arsenic d) Silicon-dioxide

b) 10-6 cm d) 10-4 cm

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

40.

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

41.

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.

b. 0.67v d. 0.8v

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

43.

b) Sound waves d) Matter waves

b. Step-down d. None

The ratio of β shows the a. voltage gain c. input resistance

b. current gain d. None

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44.

The alarm requires a voltage for its activation is a. low c. Very High

45.

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

46.

b. Micro seconds d. None

b. Current amplifier d. None

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

56.

b. 60% d. 90%

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

55.

b. Two inputs d. None

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

54.

b. Switches d. All of them

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

53.

b. 2 d. 3

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

52.

c. No internal bias

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

51.

b. No external bias

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

50.

b. 1000 Ω d. None of these

Photo – voltic cell have a. Battery input

49.

b. 1000 d. Cannot tell

The resistance between + ive and – ive inputs of op – amplifier is a. 100 Ω c. 106 Ω

47.

b. high d. None

b. Two d. Four

The Boolean expression X = A + B represents the logic operation of a. NAND gate

b. NOR gate

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d. None

c. OR gate 57.

d. NOT gate

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

58.

b. Detector d. Amplifier

XOR gate is combination of a. AND, OR and NOT gate b. NAND, OR and NOT gate c. NOT, AND and OR gate d. NOT, AND and NOR gate

59.

The open loop gain of op – amplifier is a. Zero c. Very high

60.

b. High d. Low

The width of depletion region of a diode a. Increases under forward bias c. Increases under reverse bias

61.

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

62.

b. Is independent of applied voltage d. None of these

b. Reverse Biased d. None of these

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

63.

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

64.

NAND gate is a combination a) AND gate and NOT gate b) AND gate and OR gate c) OR gate and NOT gate d) NOT gate and NOT gate

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65.

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

66.

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

67.

b) Three d) None of these

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

68.

b) 10-4m d) 10-8m

The gain A of the amplifier is

A= a) "

ΔVin ΔV!

A = ΔV!ΔVin c) "

70.

b) Millisecond d) None of these

The base of the transistor is very thin of the order of a) 10-2m c) 10-6m

69.

b) Milli-ampere d) None of these

A= b) "

ΔV! ΔVi

d) None of these

The positive sign of the gain indicates that 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.

The electronic circuits which implement the various logic operations are known as a) Digital gates c) Voltage operated gate

72.

b) Logic gate d) All of them

A diode characteristic curve is a plot between a) Current and time b) Voltage and time c) Voltage and current d) Forward voltage and reverse voltage

73.

In a half-wave rectifier the diode conducts during 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

74.

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

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a) Both inputs are O c) Both inputs are 1 75.

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

For typical transistor as an amplifier

76.

Vout R =β C V Rie a) " in

Vout =β V in b) "

Vout R = β ic V Rc c) " in

Vout R = β ie V Rie d) " in

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

77.

b) Low d) Moderate

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

b) Sensors d) None

CHAPTER 19 DAWN OF MODERN PHYSICS 1.

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)

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.

Which of the following radiations has the greatest photon a) TV waves c) X-rays

4.

b) Microwaves d) γ - rays

Linear momentum of a photon is a) Zero c) hf/c

5.

b) 25 GWh d) 250 GWh

b) Hf/c2 d) c2/hf

The linear momentum of an x-ray photon of wavelength 0.1Ao is

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a) b) c) d) 6.

6.625 x 10-23 NS 66.25 x 1023 NS 662.5 x 1023 NS Data is insufficient Stopping potential for a metal surface incase of photo electric emission depends on 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 mc2 = hf

b. d.

" ΔE. Δt ≈ h any of the above

The existence of ether wind was experimentally rejected by 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 Rest mass of photon is a) Infinite c) Very small

11.

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

12.

b) Planck’s d) Einstein

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

13.

b) Zero d) Very large

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

Which one of the following has the largest energy content? a. b. c. d.

103 photons of wavelength 2pm (Y-rays) 102 photons of wavelength 1mm (X-rays) 106 photons of wavelength 50mm (Infrared) 106 photons of wavelength 200mm (UV)

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14.

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

15.

a) pc/h" λ

b) hc/p" λ

c) p" λ /hc

d) ph/ck

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

16.

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

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.

17.

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 d) The average kinetic of the photoelectrons decrease

18.

19.

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

a) Zero

h b) 2" λ

h c) " λ

d) Ft

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

nh a. " λ c.

Zero

b. d.

2nh " λ nft

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20.

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

21.

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

The velocity of particle of mass m of de-Broglie wave length" λ is ________

2h a. " m! 2mλc 2 h c. " 22.

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 10-14 m. the electron speed should be ____ a. b. c. d.

28.

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.

27.

Electromagnetic gun Source of electromagnetic waves Deflected charged particle Converging source of electrons

A three dimensional image is obtained by ______________ a. b. c. d.

26.

Wave property Particle property Energy particle Electromagnetic wave property

In electron microscope, electric and magnetic field are used as _______ a. b. c. d.

25.

b) Wave property d) Quantum property

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

24.

d.

h " mλ

In Davison – Germer experiment, the diffracted proton from crystal shows ____________ a) Particle property c) Light property

23.

b.

mSc 2 " h

107m/sec Should be greater than speed of light Be zero Not be wave link

The energy radiated is directly proportional to fourth power of Kelvin’s temperature is _____ a. Karl-wein’s laws

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b. Raleigh jeans law c. Stephens law d. Planck’s

29.

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

30.

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

31.

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

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 a. 1.6 × 108 m/sec

32.

b. 2.6 × 108 m/sec

c. 2.6 × 107 m/sec

The anti-particle of electron is a. Proton c. Meson

b. Position d. Neutron

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

b. Materialization d. Fussion

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

b. Lorentz d. None

35. The famous Michel-son-Morely experiment proves that a. Light is energy b. Earth rotates about its axis c. Ether medium does not exist d. None 36. All the motion in this universe are a. Absolute c. Variable

b. Uniform d. Relative

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

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d. None

a. Reflective c. Radiators

38.

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

39.

b. 1.24oA d. None

b. 1930 d. None

The anti-particle of earth is a. Sun c. Black hole

47.

b. Water d. Vacuum

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

46.

b. Space d. None

The wavelength of photon with energy of 16 × 10 -19 J is a. 12.4oA c. 124oA

45.

b. Large wavelength d. None

Pair production cannot possible in a. Air c. Glass

44.

b. Large wavelength d. None

According to special theory of relatively the 4th variable is a. Time c. Speed of light

43.

c. Wein’s Law

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

42.

b. Stephen – Boltzman Law

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

41.

b. U.V region d. None

The energy emitted is directly proportional to fourth power of temperature is a. Lummer Law

40.

b. Absorbers d. None

b. Moon d. None

The minimum energy required for pair production is a. 10.2 Mev c. 102 Mev

b. 1.02 Mev d. None

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d. None

48.

Photo electric effect for visible light can be obtain from a. Sodium – Potassium

49.

The relation "

λ Max T = Contt. is

b. Pair-production d. None

If work function is 4.14ev, the threshold frequency of incident light is a. 1012Hz c. 1014Hz

58.

b. 1.38 × 10-3 m.k d. None

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

57.

b. Very low d. None

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

56.

b. Electron micrograph d. None

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

55.

b. 1.09 × 10-20J d. None

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

54.

b. 1923 d. 1919

The life time of an electron in an excited state is 10 -6 sec. What is uncertainly in energy for this time? a. 2.35 × 10-20J c. 1.05 × 10-26J

53.

b. Plank’s Law d. None

A. H Compton was awarded Nobel Prize in Physics in a. 1927 c. 1921

52.

d. None

b. Rectifier d. Photo – cell

a. Wein’s Law c. Stephen Law 51.

c. Helium – Neon

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

50.

b. Carbon – oxygen

b. 1013Hz d. 1015Hz

Each quantum is associated with radiation of

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a. Intensity c. Frequency 59.

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

60.

b. 1925 d. 1928

C A passenger passes a clock with a speed " 2 . The time period observed by him is: a) " t

= t!

t= c) " 61.

2 t! 3

b) Less than one d) None of these

At higher temperature, the body emits long wavelength in the region a) Infra red c) Far-infra red

67.

b) Relative d) None of these

v2 1− 2 c is always A quantity " a) Greater than one c) Equal to one

66.

b) 10-48N-S d) 10-20N-S

The concept of position is purely a) Specific c) Ordinary

65.

b) 0.12nm d) 120nm

The uncertainty in position of electron is 6.63Ao. The uncertainty in momentum of electron is a) 10-24N-S c) 10-16N-S

64.

b) 13.26 × 10-38J d) None

The wavelength associated with electron moving with speed 5.6 × 106 m/s is a) 12nm c) 1.2nm

63.

3 t! b) " 2 2 t= t! 5 d) "

The threshold frequency of metals is 2 × 10-4Hz. The work function of metal is a) 13.26 × 10-38ev c) 13.26 ev

62.

b. Energy d. None

b) Ultraviolet d) None of these

The Stefen-Boltzmann has the value a) 5.67 × 10-5Wm-2K-4 b) 5.67 × 10-6Wm-1K-4

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

The energy of photon of radio waves is only about a) 10-6eV c) 10-10eV

69.

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

70.

b) Photo transistor d) None of these

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

73.

b) Max Planck d) None of these

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

72.

b) Different d) None of these

The idea of quantization of energy was proposed by a) Einstein c) Compton

71.

b) 10-4eV d) 10-12eV

b) Momentum d) None of these

The equations of pair production is a) hf = 2moc2 – KE(e-) + K.E (e+) b) hf = 2moc2 + KE(e-) + K.E (e+) c) hf = 2mo2c2 + KE(e-) + K.E (e+) d) hf = 2mo2c + KE(e-) + K.E (e+)

74.

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

75.

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.

The best optical resolution is made by the microscope is a) 0.1 µm c) 0.3 µm

77.

b) 0.2 µm d) None of these

In Compton effect " λ is always

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78.

a) Less than " λ

b) Greater than " λ

c) Equal to " λ

d) None of these

Who discovered the idea of Ether? a) Schrodinger c) Michelson and Morley

79.

Can pair production takes place in vacuum because of conservation of a) Energy c) Momentum & Energy

80.

b) Time d) None

Photon ‘A’ has twice the energy of photon ‘B’. What is the ratio of the momentum of ‘A’ to that of ‘B’? a) 4 : 1 c) 1 : 2

82.

b) Momentum d) None of these

Which of the following has the same dimension as h/moc? a) Length c) Mass

81.

b) De-Broglie d) None of these

b) 2 : 1 d) None

An electron accelerated through a P.D, V has a wave associated with it of wavelength a) " 12.3

V A!

c) " 12.3 / V

2

A!

b) " 12.3 / VA

!

d) None

CHAPTER # 20 ATOMIC SPECTRA 1.

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

b. 1836 d. 183.60

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2.

Photon of high frequency will be absorbed when transisation takes place from _________ a. 1st to 5th orbit c. 3rd to 5th orbit

3.

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

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

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

6.

b) 10-8S d) 10-9S

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

7.

Hydrogen atom does not emit x-rays because __________ 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

8.

Which one of following postulate is in accordance with the Rutherford’s model? a. Continues spectra for atoms b. Discrete spectra for atoms c. Either continues for atoms d. No spectrum

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9.

X-rays are ___________ a. Unknown nature b. High energy electrons c. High energy photon d. Radioisotopes

10.

Ground state energy of the 4th orbit in a H-atom is ________ a. 13.60eV c. 0.85eV

11.

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

12.

b. 3.40eV d. -1.51eV

b. Four d. Six

The radiations emitted from hydrogen filled discharge tube show _________ a. Bound spectrum b. Line spectrum c. Continuous spectrum d. Absorption spectrum

13.

The electric P.E of an electron is an orbit at a distance from the positive charge ________ a. Ke2/rn c. –ke2/rn

14.

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

15.

b. 5th orbit d. 2nd orbit

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

17.

b. X-rays d. Visible radiations

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

16.

b. Ice2/rn2 d. –ke2/rn2

b. Infrared radiation d. Ultraviolet rays

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

b. Compton effect d. X-rays production

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18.

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

19.

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

20.

b. Positive rays d. α - rays

b. Frequency d. All of the above

When X-rays are passed through successive aluminum sheets, what happens to their thickness? a. In increases b. It decreases c. Remains same d. Sometimes increase sometimes decreases

21.

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

22.

b. β - rays d. All of above

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

23.

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

24.

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.

b. X - rays d. Infrared

b. he/vc d. impossible to predict

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

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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.

The characteristic X-rays spectrum is due to ____ 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

27.

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

28.

b. 9.1 x 10-18m d. 4 x 10-10m

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

29.

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

30.

UV radiation can be produced by __________ a. Heating the filament b. Ionization of atoms c. Electron excitation in the gas d. All the above

31.

What is the velocity of a particle of mass

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m and de-Broglie Wavelength? a. h/mλ c. Mh/h 32.

b. 2h/mλ d. (2hc/mx)½

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

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

35.

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

36.

The meta stable state for an atom in laser light is _____________ a. 10-4 sec c. 10-3 sec

37.

b. 10-5 sec d. 10-8 sec

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

38.

b. Normal state d. All the above

b. He – Ne both d. Electrons of Ne

Reflecting mirrors in laser is used to ________ a. Further stimulation b. Lasing more c. For production more energetic laser d. All the above

39.

The velocity of laser light is __________

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

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

41.

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

42.

b. γ – rays d. none

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

43.

b. large d. None

The value of Rydberg’s constant is a. 1.0974 × 107m-1 c. 1.0974 × 10-7m-1

44.

b. 1.0794 × 107m-1 d. None

The shortest wave length radiation in Bracket series has wavelength

16 R a. " H c. 45.

RH b. " 16

16 RH

d. None

Bohr’s theory is failed to explain a. H – spectrum

46.

b. He – spectrum

b. 13.6ev d. none

Which one of the following is more coherent a. X – rays c. Laser

48.

b. Normal light d. γ – rays

Sunlight spectrum is a. Discrete

49.

d. None

The ionization energy of H – atom is a. – 13.6ev c. ±13.6ev

47.

c. Complex atoms spectrum

b. Line spectrum

c. Continuous spectrum

Optical pumping exist in a. X – rays

b. Laser

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d. none

c. Spectrum 50.

A common He – Ne gas laser contain, He – Ne ration a. 85 – 15 % c. 70 – 30%

51.

b. 106 d. 1012

The value of Plank’s constant is a. 6.63 × 10-34 J.sec

58.

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

The ratio of volume of an atom to the volume of nucleus is a. 103 c. 109

57.

b. Mari – curie d. Lane

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

56.

b. Chadwick d. Stony

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

55.

b. Smaller d. None of these

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

54.

b. – ive d. None

According to Bohr’s theory the outer orbit Electron has ________ energy than inner orbits. a. Greater c. Equal

53.

b. 80 – 20% d. None

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

52.

d. None

b. 6.63 × 10-34 J/sec

c. 6.63 × 10-34 sec/J

Laser is a device which can produce a. an intense beam of light b. Coherent light c. Monochoromatic light d. All

59.

The total energy of electron in state n = α is

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d. None

a. + ive c. zero 60.

b. – ive d. None

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

61.

b) Circular path d) None

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

62.

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

63.

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

64.

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

65.

b) – 13.6 eV d) 13.5 eV

Bremsstrahlung are those in which radiations are produced of a) Long wavelength b) Short wavelength c) Wavelength in X-rays region d) None of these

66.

In LASER principle, a photon produce another photon by the process of a) Excitation c) Ionization

67.

b) De-excite d) None of these

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

68.

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

b) Several millimeter d) Several centimeter

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69.

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

70.

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

71.

b) Large d) None of these

In Laser a Meta-stable state is a) An excite state b) In which an electron is usually stable c) In which an electron reside 10-3 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.

75.

In Balmer series the shortest wavelength radiations have wavelength equal to

& RH # $ !m 4 % " a) "

& 4 $$ R b) " % H

& RH # $ !m 9 " c) " %

d) " (9 R H ) m

The longest wavelength radiations in Braket series have wavelength equal to

25 RH a) " 16 135 27 R H c) " −

76.

# !! m "

16 RH b) " 25 d) None

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

a) "

λ=

V!e m

λ= b) "

he V!e

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λ= c) "

h V!e

d) "

λ=

V!e h

Chapter 21 NUCLEAR PHYSICS 1.

In nucleus of uranium the number of neutrons will be ___________

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a. b. c. d. 2.

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

3.

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 _________

a) 1.66 x 10-27 kg c) 1.66 x 10-20 kg 4.

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

5.

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

Antimatter consists of _____________ a) Antiproton c) Positron

7.

b) Antineutron d) All of above

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

8.

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

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

6.

b) 1.66 x 10-25 kg d) All of above

b) Meson d) Quartz

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 106 years c) 1590 x 1025 years

b) 1590 x 1012 years d) Never

9. Which one of the following radiation possesses maximum penetrating power? a) α - rays

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

Electrons a) b) c) d)

11.

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

Radioactivity is a ______________ a) b) c) d)

12.

Spontaneous activity Chemical property Self disintegration property Both a and c Energy liberated when one atom of U-235 undergoes fission reaction is ______ a) 200 Mev c) 30 Mev

13.

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

14.

15.

b) Proton – Neutron d) All of the above

Mass defect per nucleons is _________ a. b. c. d.

16.

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)

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

18.

b) Greater than 82 d) Greater than 102

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

17.

b) 40 Mev d) 20 Mev

b) Proton d) Positron

Diameter of an atom is approximately _______ a) 10-12 m

b) 10-11 m

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c) 10-10 m 19.

d) 10-14 m

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

20.

b) N = Noext d) No = N(Iext)

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

21.

Binding energy per nucleon Energy of decay Destruction energy All of above Fission chain reaction in a nuclear reactor can be controlled by introducing ________

a) Iron rod c) Cadmium rods 22.

b) Graphite rods d) Platinum rods

Which one of the following possesses maximum velocity? a) α - rays b) β - rays c) γ - rays d) All of the above have same speed

23.

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

24.

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

25.

+1.6 x 10-19c -1.6 x 10-19c Zero No definite charge A particle having the mass of an electron and the charge of a proton is called

a) Antiproton c) Gamma rays 26.

b) Positron d) Photon

Mass of neutron is ____________ a) 1.67 x 10-13 Kg c) 9.1 x 10-31 Kg

27.

b) Maxwell d) Thomson

b) 1.67 x 10-27 Kg d) 1.67 x 10-19 Kg

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

b) Isobars d) Isomers

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28.

A mass spectrograph sorts out _______ a) Molecules c) Elements

29.

b) Ions d) Isotopes

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 An α - particle is emitted from 88Ra226, what is the mass and atomic number of the daughter nucleus?

30.

a. b. c. d. 31. a) b) c) d) 32. a) b) c) d) 33.

Mass Number 224 220 222 226

The unit of Radioactivity “Curie” is equal to ___________ 3.74 x 109 disintegration per sec 3.70 x 1010 disintegration per sec 3.55 x 1010 disintegration per sec 3.60 x 1010 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 _______ a) 92U235 c) 92U234

34.

b) Density d) Half life

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

36.

d) 92

b) 92U238

U239

Radioactive materials can be identified by measuring their_______

a) Hardness c) Mass

35.

Atomic Number 84 80 86 87

b) Fusion reaction d) Chemical reaction

Pair production takes place in the vicinity of heavy nucleus so that __________

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a) b) c) d) 37.

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 _______ a) Protons c) Neutrons

38.

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

39.

a) b) c) d) 42.

a) b) c) d) 44.

α - rays β - rays γ- rays ‘b’ & ‘c’ have equal antiseptic properties Charge on α - particle is _________ b) +2 d) -1

B-particle ionizes an atom ________ Through direct collision Through electrostatic attraction Through electrostatic repulsion All of above T.V. sets and microwave oven emit ______ a) X - rays c) β - rays

45.

b) Strontium – 90 d) Nickel – 63

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

a) +1 c) -2

43.

b) β - rays d) X - rays

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

41.

b) Carved d) Elliptical

Which one of the following radiations are suitable for the treatment of an infection in the interior body? a) α - rays c) γ - rays

40.

b) Electrons d) Nothing

b) α - rays d) γ - rays

A β - particle in a single encounter _______

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a) b) c) d) 46.

Loses a small fraction of its energy Loses most of its energy Loses no energy at all Loses energy at all Strontium -90 is used as _________

a) β - particle source c) γ - particle source 47.

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

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

b) β - rays d) Neutron

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

55.

b) Range d) Limit

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

54.

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 53.

b) Charge d) Momentum

CFC is used in ____________

a) Refrigerator c) Plastic foam industry 52.

b) Barium Palatino cyanide d) All of above

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

a) Energy c) Mass 51.

b) Extremely fast counting d) All situations

A α - particle can produce fluorescence in ___________

a) Zns c) Calcium tunzstate 50.

b) 100 times more d) 10 times less

Geiger counter is suitable for ______

a) Fast counting c) Slow counting 49.

b) α - particle source d) Neutrons source

b) I -131 d) C -14

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

b) Heat waves d) X - rays

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56.

Charge on B-particle is __________ a) +1 c) +2

57.

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

a) Chargless c) Highly penetrating 58. a) b) c) d)

b) Massless d) All of above

B-particle ionizes an atom ________ Due to electrostatic force of attraction Due to electrostatic force of repulsion Due to direct collision Due to gravitational force

59. a) b) c) d)

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

60.

Pair production can take places only with ______________

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

62.

b) Heavy water d) Aluminum

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

a) 1 rem per week c) 4 rem per week 64.

b) Linear acceleration d) Wilson cloud

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

a) Ordinary water c) Lead 63.

b) γ - rays d) IR-rays

A device for producing high velocity nuclei is ___________

a) Cloud chamber c) A mass spectrograph

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

65.

b) -1 d) -2

b) β - rays d) γ – rays

Strong nuclear force a) Increase with magnitude of increasing charge b) Decreases with magnitude of increasing

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charge c) Is independent of charge d) None 66.

Complete the reaction "

Z

X

A

→ X + − β !+ ....... + Q Z +1

a) Neutrino c) " α - particle 67.

b) Antineutrino d) None

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

68.

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 a) 1.67 × 108 years c) 4.5 × 108 years

70.

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

71.

b) Indirect ionization d) None of these

" γ - rays are absorbed by a sheet of a) 1 ~ 5 mm of lead c) 5 ~ 10 mm of lead

75.

b) Proton d) None of these

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

74.

b) Very easily d) None of these

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

73.

b) Straight d) None of these

" β - particles can be deflected by collisions than the " α -particles is a) Difficult c) Easily

72.

b) 3.3 × 109 years d) 4.5 × 109 years

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

Tracks obtained by " β - particles in Wilson Cloud Chamber is

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

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

77.

b) 0.1 mm of Hg d) None of these

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

78.

b) Self quenching d) None of these

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.

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

80.

b) Surface barrier d) None of these

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

b) High d) None of these 235

81.

The breakage of "

U

92

produces the fragments as

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

b) Sn and Mo d) All of them

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

83.

b) Uranium – 233 d) All of these

The temperature of the core of the reactor rises to about a) 1000oC c) 1200oC

84.

b) 1100oC d) 1300oC

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

85.

b) Fast neutron d) None of these

Ultraviolet radiation cuase a) Sum burn

b) Blindness

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c) Skin Cancer 86.

d) All of them

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

87.

b) Heart d) Brain

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

88.

b) Protons d) None of these

Subatomic particles are divided into a) Photons c) Hadrons

89.

b) Leptons d) All of these

Hadrons are the particle included a) Protons c) Mesons

90.

b) Neutrons d) All of these

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

91.

b) Muons d) All of these

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

92.

b) Half unit d) None of these

Meson is made from a) A pair of quarks b) A pair of anti quarks c) A pair of quarks and anti quarks d) None of these

93.

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

94.

b) Greater d) None

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) 25% c) 7.5%

95.

A nuclide " 86 a) " 84 c) " 80

S 212 S 220

b) 50% d) 15%

R 220

decays to a new nuclide by two " α -emissions, the nuclide S is b) " 82

S 212

d) None

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