This document contains a past physics exam with 44 multiple choice questions covering various physics topics. The questions cover concepts such as mechanics, electricity, waves, optics, and thermodynamics. The document provides the question stem and 4 possible answer choices for each question.

1. AMU –PAST PAPERS
PHYSICS- UNSOLVED PAPER - 1999

2. SECTION – I
 Single Correct Answer Type
 There are five parts in this question. Four choices are given for each part and one of them is
correct. Indicate you choice of the correct answer for each part in your answer-book by
writing the letter (a), (b), (c) or (d) whichever is appropriate

3. 01 Problem
The substance which shows no elastic after effect is :
a. Silk
b. Rubber
c. Copper
d. Quartz

4. 02 Problem
A ball of mass m falls vertically to the ground from a height h1and rebound to a
height h2. The change in momentum of the ball on striking the ground is :
a. m 2(h1 h2 )
b. n 2g(m1 m2 )
c. mg (h1-h2)
d. m( 2gh1 2gh2 )

5. 03 Problem
In 1.0 second a particle goes from point A to point B moving in a semicircle of
radius 1.0 m figure. The magnitude of the average velocity is :
a. Zero
b. 1.0 m/s
c. 2.0 m/s
d. 3.14 m/s

6. 04 Problem
In the Young’s double slit experiment . If the width of the slits are in the ratio 4:9.
then the ratio of intensity at maxima to the intensity at minima will be :
a. 9:4
b. 25:1
c. 81:16
d. 169:25

7. 05 Problem
If the earth were the cease rotating about its own axis. The increase in the value
of g in C.G.S. system at a place of latitude of 450will be:
a. 2.68
b. 1.68
c. 3.36
d. 0.34

8. 06 Problem
A transformer is employed to reduce 220 volt to 11 volts. The primary draws a
current of 5 A and the secondary 90 A.
The efficiency of the transformer is:
a. 90%
b. 45%
c. 75%
d. 20%

9. 07 Problem
A transistor has an a = 0.95. It has change in emitter current of 1000 mA then
the change in collector current is:
a. 95 mA
b. 99.05 mA
c. 100.96 mA
d. 100 mA

10. 08 Problem
The resistance of a wire at 20 C is 20 ohms and at 500 C is 60 60 ohms. At which
temperature its resistance will be 25 ohm?
a. 800 C
b. 700C
c. 600 C
d. 500 C

11. 09 Problem
Electron can not be constituent of the nueleus because
a. The electron is a negatively charged particle
b. The Compton of wavelength of electron is larger than the size of nucleus
c. The mass of the electron is very small as compred to the mass of the neutron
or proton
d. None of these

12. 10 Problem
Energy E and frequency v of a photon is correctly represented by:
a.
b.
c.
d.

13. 11 Problem
The de Broglie wavelength of thermal neutron at a temperature T K is:
a. 3MKTC
h
b. 3MT
h
c.
2mKT
h
d. 2MKT

14. 12 Problem
A man in a balloon rising vertically with an acceleration of 4.9m/s2 releases a ball
2 sec after the balloon is let go from the ground. The greatest height above the
ground reached by the ball is:
(g = 9.8 m/s2)
a. 24.7 m
b. 7.35 m
c. 28.4 m
d. 14.7 m

15. 13 Problem
A body of mass M at rest explodes into three masses, two of which are of mass
m
, each are thrown off in perpendicular direction with velocity 3 m/s and 4
4
m/s respectively the third piece will be thrown off with a velocity of:
a. 3 m/s
b. 2.5 m/s
c. 4.5 m/s
d. 9 m/s

16. 14 Problem
A wet open umbrella is held vertical and whirled about the handle at a uniform
rate of 21 revolution in 44 seconds. If the rim of the umbrella is a circle of 1 m
in diameter and the height of the rim above the floor is 4.9 m. The angular
speed of the umbrella is:
a. 2.5 rad/sec
b. 1 rad/sec
c. 1.5 rad/sec
d. 3 rad/sec

17. 15 Problem
A current of I amp flows through a square loop of wire of side a metre. The
magnetic induction at the centre of square loop will be :
a. 2 2 0i
a
b. 2 0i
2 a
2 0 i
c. 2 a
0 i
d. 2 2 a

18. 16 Problem
One milliwatt of light of wavelength 4560 Å is incident on a caesium surface.
The photoelectric current produced, if the quantum efficiency of the surface
for photoelectric emission is only 0.5%, will be :
a. 5.8 x 10-6 amp
b. 0.92 x 10-6 amp
c. 2.84 x 10-6 amp
d. 1.84 x 10-6 amp

19. 17 Problem
The value of inductance which should be connected in series with a capacitance
of 0.5 , resistance of 10 ohm and an A.C source of 50 cps so that the power
factor of the circuit is unity, will be :
a. 20.28 H
b. 10.13 H
c. 15.26 H
d. 25.28 H

20. 18 Problem
Two capacitors of capacitances 8 and 2 are connected in series across a 100 volt
D.C. supply. Now if the supply voltage is removed and the capacitors are then
connected in parallel. The final charge on each capacitor will be :
a. 2.56 x 10-4 C, 6.4 x 10-5
b. 3.56 x 10-4 C, 7.4 x 10-5 C
c. 1.4 x 10-4 C, 5.4 x 10-5 C
d. none of these

21. 19 Problem
The amount of work done to increase the temperature of one mole of an ideal
gas by 300. if it is expanding under the condition V T 2/3 , will be :
a. 83 J
b. 166 J
c. 106 J
d. 16.6 J

22. 20 Problem
How many calories of heat will approximately be developed in a 210 watt
electric bulb in 5 minutes?
a. Zero
b. 63000
c. 1050
d. 15000

23. 21 Problem
In the following circuit 5 resistor developes 10.25 cal/s due to a current
flowing through it. The heat developed in 2 resistance:
a. 7.31 cal
b. 3.65 cal
c. 8.31 cal
d. 14.32 cal

24. 22 Problem
Calculate the current through the battery and through a resistance of 6 in the
given circuit:
a. 2.66 amp, 2 amp
b. 1.33 amp, 1 amp
c. 0.66 amp, 05 amp
d. none of these

25. 23 Problem
Two long parallel wires carrying equal current separated 1 m, exert a force of
2x10-7 N/m on one another. The current flowing through them will be :
a. 1.0 A
b. 2.2 amp
c. 0.5 amp
d. 2 x 10-7 amp

26. 24 Problem
Two short magnets are placed on a piece of cork which floats on water. The
magnets are so placed, bisects the axis of 9ther at right angles. Then the cork :
a. Has neither translational nor rotational motion
b. Has translational as well as rotational motion
c. Moves along straight line
d. Rotates only

27. 25 Problem
A paramagnetic substance of susceptibility 3x10-4 is placed in a magnetic field of
4x10-1 Am-1 . then intensity of magnetization is :
a. 12
b. 1.33 x 108
c. 0.75 x 10-8
d. none of these

28. 26 Problem
A fish looking up through the water sees the out side world contained in a
circular horizon. If the refractive index of water is 4 and the fish is 12 cm below
3
the surface. The radius of circle is :
12 x 3
a. 7 cm
b. 12 x 5 cm
3
c. 12 x 3 x 7 cm
d. 12 x 3 x 5 cm

29. 27 Problem
4
Two immiscible liquid of refractive indices 1.5 and 3 are filled in a glass jar each
of height 6 cm. A light of source S is at the bottom of the jar. The apparent depth
of light source will be :
a. 12.5 cm
b. 17 cm
c. 12 cm
d. 8.5 cm

30. 28 Problem
125 Water drops of equal radius and equal capacitance C coalesce to form a
single drop of capacitance C coalesce to form a single drop of capacitance C’.
The relation between C and C’ is :
a. C’ = 5 C
C
b. C’ = 125
C
c. C'
5
d. C’ = 125 C

31. 29 Problem
In a circuit shown two capacitors have identical geometry. But a material of
dielectric constant 3 is present between the plates of B. If a battery of emf 10V is
connected across the combination the potential difference across S and B will be
respectively :
a. 7.5 V, 2.5 V
b. 8.5 V, 3.5 V
c. 5 V, 3.0 V
d. none of these

32. 30 Problem
Ten tuning forks are arranged in increasing order of frequency in such a way that
any two nearest forks produce 4 beats/sec. The highest frequencies is twice that
of the lowest possible, lowest and highest frequencies are :
a. 36, 72 Hz
b. 22, 44 Hz
c. 50,100 Hz
d. 40, 80 Hz

33. 31 Problem
The equation of progressive wave is y = 2 sin (o.5x + 200t) (x,y in meter). The
amplitude and velocity of wave respectively are :
a. 2 cm, 100 cm/sec
b. 2 cm, 0.5 cm/sec
3
c. 2 cm, 400 cm/sec
d. 0.2 cm, 200 cm/sec

34. 32 Problem
The radius of earth’s orbit is made one fourth, the duration of a year will become
:
1
a. 4 times
1
b. 8
times
c. 4 times
d. 8 times

35. 33 Problem
A man is sitting in a boat which is floating on a pond. If the man drinks some
water from the pond, the level of water in the pond :
a. Man decrease or increase dependial on the weight of the man
b. Remains unchanged
c. Increases
d. Decreases

36. 34 Problem
In an interference pattern produced by the identical coherent sources of
monochromatic light, the intensity at the site of central maxima is I. The intensity
at the same spot when either of the two slits is closed is I0. We must have :
a. I = 4I0
b. I and I0 are related
c. I = 2I0
d. I = I0

37. 35 Problem
Two lenses of power + 12 and – 2 diopters are placed in contact. What will be
the focal length of combination ?
a. 8.33 cm
b. 16.6 cm
c. 12.5 cm
d. 10 cm

38. 36 Problem
The focal length of the objective and eye piece of a telescope are respectively
200 cm and 5 cm. The maximum magniflying power of the telescope will be :
a. -100
b. - 60
c. - 48
d. - 40

39. 37 Problem
A gas is compressed at a constant pressure of 50 N/m2 from a volume of 10 m3 to
a volume of 4 m3. Energy of 100 joule is thus added to the gas by heating Its
internal energy is :
a. Decreased by 200 J
b. Increased by 100 J
c. Increased by 100 J
d. Increased by 400 J

40. 38 Problem
The wavelength of maximum energy released during an atomic explosion was
2.93 x 10-10 m. the maximum temperature attained must be, (Weins constant =
2.93 x 10-3 mK):
a. 5.86 x 107 K
b. 10-13 K
c. 10-7 K
d. 107 K

41. 39 Problem
Which one of the following is the best observer of thermal radiation :
a. Lamp black
b. White cloth
c. Quartz
d. Flint glass

42. 40 Problem
Two metallic blocks A and B of thermal conductivities 4 K and K are connected as
shown in the figure. The length of the blocks are L and respectively, then
equivalent thermal conductivity of combination of two blocks is :
a. 2 K
b. 9 K
5
c. 2 K
d. 3 K

43. 41 Problem
The least velocity required to throw a body away from the surface of a
planet, so, that it may not return is (radius of the planet is 6.4 x 106 m, g = 9.8
m/s2)
a. 11.2 x 103 m/sec
b. 15.0 x 103 m/sec
c. 12.8 x 103 m/sec
d. 9.8 x 103 m/sec

44. 42 Problem
A body of mass 2 kg is released at the top of smooth inclined plane having
inclination 300. It takes 3 second to reach the bottom. If the inclination is
doubled keeping same height (i.e., made 600), the time taken will be :
a. 1.5 sec
b. 3 sec
c. 3 sec
d. 3 3 sec

45. 43 Problem
A ball is dropped from the top of building at the same instant another ball is
thrown vertically upwards from the ground level the ball collide 2 second later.
The height of the building is :
a. 72 m
b. 54 m
c. 18 m
d. 36 m

46. 44 Problem
A projectile can have the same range for two angle of projection. If h1 and h2 are
maximum heights when the range in the two case is R, then the relation
between R, h1 and h2 will be
a. R = 4 h1 h2
b. R = 2 h1 h2
c. R = 2h1 h2
d. R = h1 h2

47. 45 Problem
a b
The potential energy of particle in a certain field is given by U where
r2 r
a, and b are positive constants and r is the distance from the centre of the filed.
The distance of the particle in the stable equilibrium position is :
2a
a. -
b
2a
b. b
a
c. b
a
d. b

48. 46 Problem
A gun weighing 5 kg fires a bullet of mass 10-2 kg with a speed of 5 x 102 m/s.
What is the kinetic energy of the bullet and gun will respectively ?
a. 1.25 x 103 J, 2.5 J
b. 2.25 x 103 J, 3.5 J
c. 0.25 x 103 J, 1.5 J
d. none of these

49. 47 Problem
The maximum wavelength of radiation that can produce photoelectric effect in a
certain metal is 200 n m. The maximum Kinetic Energy acquired by the electrons
due to radiations of wavelength 100 nm will be :
a. 200 eV
b. 100 eV
c. 6.2 eV
d. 12.4 eV

50. 48 Problem
Light of frequency 5 v0 fall on a photosensitive surface of the solid frequency v0.
The velocity of emitted electrons is 4 x 105 m/s. If now light of frequency 9v0 is
incident on the surface, then velocity of electron will become :
a. 5.64 x 105 m/s
b. 7.2 x 105 m/s
c. 8 x 105 m/s
d. 2 x 105 m/s

51. 49 Problem
A star initially has 1040 deuterons. It produces energy na the process
2 + 1H2 1H3 + p
1H
2 + 1H3 2H4 + n
1H
If the average power radiated by the star is 1016 =2.014 amu, M(n) = 4.001
amu, M(m) = 1.008 amu M(He4) = 4.001 amu the deuteron supply of the star is
exhausted in the time of the order of the :
a. 1016 sec
b. 1012 sec
c. 106 sec
d. 108 sec

52. 50 Problem
The type of bonding in silicon crystal is :
a. Vander walls
b. Covalent
c. Ionic
d. Metallic

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