29-12-2012, 03:18 PM
PHYSICS Sample Question
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1 The wavelength of the matter wave is independent of :-
a)Mass b)Velocity
c)Momentum d) Charge
2 Phase velocity of a wave is given by:-
a)w/k b) √w/k
c) k/w d) √(w/k)
3 The phase velocity (vp)and group velocity (vg)of debroglie wave in free space are related by :-
a)vp/vg=√2 b) vg/vp=0.5
c) vg vp=c2 d) None of these
4 The rest mass of a photon is :-
a)Infinity b) zero
c) 1.67 X 10-31 d) 1amu
5 Compton shift is given by :-
a)h/moc2(1-cosФ) b) moc2/(1- cosФ)h
c) (h/moc)(1- cosФ) d)( moc)(1- cosФ)/h
6 The fractional change in the wavelength of an x-ray of wavelength 0.400 A0
That undergoes a 90 degree Compton scattering from an electron will be:-
a)0.806 b) 608.06
c) 8608 d) 0.0608
7 The wavelength of x-ray scattered at 1800 from a carbon block if the frequency of incident rays is 1.8X10 18 sec-1 is :-
a)1.72 A0 b)1.27A0
c)17.2A0 d)127A0
8) The wave function of certain particle is ψ=Acos2x for –π/2<x< π/2 The value of A will be:-
a)√(8/3 π) b)3 π/8
c)3 π/√8 d) None of these
9 The expectation value <px> of the momentum of particle trapped in a 1-D box is :-
a)1 b) Infinite
c) zero d) 2
10 The probability that a particle in a box L wide can be found between x=0 and x=L/n, when it is in the nth state:-
a)1/nm b)1/n
c) m/n d) n2/m
11 Debroglie wavelength of an electron which has been accelerated from rest through a potential difference of 100v is :-
a)12.27A0 b) 1.227 A0
c)15A0 d) 1.5 A0
12 The energy difference between the ground state and first excited state for electron if the length of a box is 10-8cm will be
a)131.1 ev b) 111.3 ev
c)113.1 ev d) 1131 ev
13 In which direction the recoil electron in Compton scattering has maximum energy:-
a) 00 b) 900
c)1800 d)450
14 Which of the following phenomenon produces the colors in soap bubble:-
a)Interference b) diffraction
c) polarization d) Dispersion
15 Newton’s ring illustrate the phenomenon of :-
a)Interference b) diffraction
c) polarization d) Dispersion
16 Light beam after reflection from an optically denser medium undergoes a phase changes of :-
a)Π b) 0
c) Π/2 d)2 Π
17 The diameter of bright ring in newton’s ring is :-
a)Directly Proportional to square root of even natural numbers
b)Directly Proportional to square root of odd natural numbers
c)Inversely Proportional to square root of even natural numbers
d)Inversely Proportional to square root of odd natural numbers
18 In newton’s ring , the fringes are circular because:-
a)The air film is symmetrical about the point of contact of the lens with the plane glass plate
b) The air film is Asymmetrical about the point of contact of the lens with the plane glass plate
c) a and b both
d) None of these
19 In Newton’s ring experiment the diameter of nth and (n+14)th rings are 4.2mm and 7.0 mm respectively , radius of curvature of plano-convex lens is 1m the wavelength of light is :-
a)6000A0 b) 5600 A0
c) 6500 A0 d) 5000 A0
20 In Newton’s ring experiment the diameter of 14th and 12th dark ring are 0.400cm and 0.700cm the diameter of 20th dark ring will be:-
a)9.05cm b)5.09cm
c) 0.905cm d) 95 cm
21 In an experiment with Michelson’s Interferometer it is found that 40 rings to merge the center , the mirror had to moved through 0.01mm the wavelength of light is :-
a)4X10-5cm b) 5 X 10 4 cm
c) 5 X 10-5cm d) 5 X 10 3 cm
22 The distance between successive position of movable mirror of the Michelson’s interferometer giving best fringes in case of sodium sources having lines 5896 and 5890 A0
a)982.4mm b)0.2894 mm
c)28.94mm d)9284mm
23 In Newton’s rings arrangement the diameter of 10th dark ring changes from 1.5cm to 1.27cm when a liquid is introduced between the lens and is introduced between the lens and glass plate the refractive index of the liquid is:-
a)1.953 b) 1.395
c) 15.39 d) 193.5
24 The separation between two consecutive bright and dark fringes are:-
a)λD/2d b) 2 λD/d
c)D2d/λ d) 2d/ λD