Cbse 2009 Physics Board Paper Class Xii

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I

Series SSO

'55/1

Code N~.

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a;)s ;r.

Candidates must write the Code on

Roll No. fB-;t.

the title page of the answer-book. rRTamn
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~~~I

•

Please check that this question paper contains 15 printed pages.

•

Code number given on the right hand side of the question paper should be written on the title page of the answer-book by the candidate.

•

Please check that this question paper contains 30 questions.

•

Please write down the Serial Number of the question before attempting it.

•

15 minutes time has been allotted to read this question paper. The question paper will be distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the student will read the question paper only and will not write any answer on the answer script during this period.

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PHYSICS (Theory) ~fdS1I~(~) Time allowed : 3 hours

5511

Maximum Marks : 70

1

p.T.a.

---~---

General Instructions

:

(i)

All questions are compulsory.

(ii)

There are 30 questions in total. Questions 1 to 8 carry one mark each, questions 9 to 18 carry two marks each, questions 19 to 27 carry three marks each and questions 28 to 30 carry five marks each.

(iii)

There is no overall choice. However, an internal choice has been provided in one question of two marks, one question of three marks and all three questions of five marks _each. You have to attempt only one of the choices in such questions.

(iv)

Use of calculators is not permitted.

(v)

You may use the following values of physical constants wherever necessary: c = 3 x 108 ms-1 h = 6·626

)

e = 1-10

--

1·602

x

10- 34 Js

x 10-19

C

= 4n x 10-7 T m A-I

1

41tE

= 9 x 109 N m2 C-2 o

Mass of electron me = 9·1 x 10-31 kg Mass of neutron mn 1·675 x 10-27 kg Boltzmann's constant k = 1·381 x 10-23 ==

J K-l

Avogadro's number NA = 6·022 x 1023 / mol-1 Radius of earth = 6400 km ~~: (i)

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What is the electrostatic potential due to an electric dipole at an

/

1

equatorial point ?

Name the EM waves used for studying crystal structure What is its frequency range?

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An electron does not suffer any deflection while passing through a region of uniform magnetic field. What is the direction of the magnetic field?

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Name the EM waves used for studying crystal structure What is its frequency range? imT q,1 r~~c.1l~~ -;wr

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An electron does not suffer any deflection while passing through a region of uniform magnetic field. What is the direction of the magnetic field?

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How the angularchange separation of interference fringesthein slits Young's doublewould slit experiment when the distan
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Two thin lenses of power + 6 D and - 2 D are in contact. What is the focal length of the combination ? ~

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Draw 3 equipotential surfaces corresponding to a field that uniformly increases in magnitude but remains constant along Z-direction. How are these surfaces different from that of a constant electric field along Z-direction ? ~

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Ilhefine a transparent medium. prism. Plot a graph A ray refractive of light index passes ofthrough a triangular showing the variation of the angle of deviation with the angle of incidence.

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55/1

5

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Optical the following and radio questions telescopes : are built on the ground while X-ray . astronomy is possible only from . satellites orbiting the Earth. Why? The small ozone layer on top of the stratosphere is crucial for human survival. Why?

(a)

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Define the term 'linearly polarised light' .. When· does the intensity of transmitted light become maximum, when a polaroid sheet is rotated between two crossed polaroids ?

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A wire of 15 Q resistance is gradually stretched to double its original length. It is then cut into two equal parts. These parts are then connected in parallel across a 3·0 volt battery. Find the current drawn from the battery. fctm

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The mass of a nucleus in its ground state is always less than the total mass of its constituents - neutrons and protons. Explain. Plot a graph showing the variation of potential energy of a pair of nucleons as a function of their separation.

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Write the function of (i) Transducer and (ii) Repeater in the context of communication system.

2

OR

'firite

55/1

two factors justifying the need of modulation for transmission of a signal. 7

2 p.T.a.

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A positive point charge (+ q) is kept in the vicinity of an uncharged conducting plate. Sketch electric field lines originating from the point on to tl-z ,·,u.rfaceof the plate. Derive the expression for the electric field at the surface of a charged conductor. OR

~a.rallel plate capacitor is charged by a battery. After some time the battery is disconnected. and a dielectric slab of dielectric constant K is inserted between the plates. How would Wthe capacitance,'-fii1-the electric field between the plates and .(.iii)the energy stored in the capacitor, be affected ? Justify your answer.

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.State the principle of working of a meter bridg¢. In a meter bridge balance point is found at a distance II with resistances Rand S as shown in the figure. X ,/I./VVVV't.

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55/1

9

P.T.D.

cY~tate

Faraday's law of electromagneticinduction.

A jet plane is travelling towards west at a speed of 1800 km/h.

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What is the voltage difference developed between the ends of the wing having a span of 25 m, if the Earth's magnetic field at the location has a magnitude of 5 (i)

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In Young's double slit experiment, monochromatic light of wavelength 630 nm illuminates the pair of slits and produces an interference pattern in which two consecutive bright fringes are separated by 8·1 mm. Another source of· monochromatic light produces the interference pattern in which the two consecutive bright fringes are separated by 7·2 mm. Find the wavelength of light from the second source. What is the effect on the interference fringes if the monochromatic source is replaced by a source of white light?

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Draw a schematic arrangement of the Geiger - Marsden experiment. How did the scattering of a-particles by a thin foil of gold provide an important way to determine an upper limit on the size of the nucleus? Explain briefly.

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L'DistingUiSh between sky wave and space wave propagation. Give a brief description with the help of suitable diagrams indicating how these waves are propagated. ~

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With the help of a suitable diagram, explain the formation of depletion . region in a p-n junction@ow does its width change when the junction is (i) forward biased, and (ii} reverse biased ? ~

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28. Draw a schematic sketch of a cyclotron. Explain briefly how it works and how it is used to accelerate the charged particles. (i)

Show that time period of ions in a cyclotron is independent of both the speed and radius of circular path.

(ii)

What is resonance condition ? How is it used to accelerate the charged particles ?

5

OR

Two straight long parallel conductors carry currents II and 12 in the same direction. Deduce the expression for the force per unit length between them. Depict the pattern of magnetic field lines around them. 5511

11

p.T.a.

(b)

A rectangular current carrying loop EFGH is kept in a uniform magnetic field as shown in the figure.

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What is the direction of the magnetic moment of the current loop? When is the torque acting on the loop (A) maximum, (B) zero?

(ii)

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A rectangular current carrying loop EFGH is kept in a uniform magnetic field as shown in the figure.

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29. (a) (b)

What are eddy currents?

Write their two applications. -

Figure shows a rectangular conducting loop PQSR in which arm RS of length 'l' is movable. The loop is kept in a uniform magnetic field 'B' directed downward perpendicular to the plane of the loop. The arm RS is moved with a uniform speed 'v'. X

X

X R

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x

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X

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r I

r-

p X

1

Q

v

Deduce an expression for (i)

the emf induced across the arm 'RS',

(ii)

the external force required to move the arm, and

(iii)

the power dissipated as heat.

5

OR

(a)

(b)

55/1

State Lenz's law. Give one example to illustrate this law. "The Lenz's law is a consequence of the principle of conservation of energy." Justify this statement. Deduce an expression for the mutual inductance of two long coaxial solenoids but having different radii and different number of turns.

13

5

p.T.a.

(b)

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en

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(i)

Draw a labelled ray diagram to show the formation of image in an astronomical telescope for a distant object.

(ii)

Write three distinct advantages of a reflecting telescope over a refracting type telescope~

type

A convex lens of focal length 10 cm is placed coaxially 5 em away from a concave lens of focal length 10 em. If an object is placed 30 em in front of the convex lens, find the position of the final image formed by the combined system.

OR 55/1

I"

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14

(a)

With the hcl.p of a suitable ray diagram, formula for a concave mirror.

derive the mIrror

(b)

The near point of a hypermetropic person is 50 em from the eye. What is the power of the lens required to enable the person to read clearly a book held at 25 em from the eye ?

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(i)

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50

it

25

em ~

?

5

55/1

15

97100

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