AMU - Physics - 2003

AMU –PAST PAPERS
PHYSICS- UNSOLVED PAPER - 2003

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

01 Problem

A man of mass 60 kg and a boy of mass 30 kg are standing together on
frictionless ice surface. If they push each other apart, man moves away with a
speed of 0.4 m/s relative to ice after 5 sec. They will be away from each other at
a distance of :

a. 9.0 m
b. 3.0 m
c. 6.0 m
d. 30 m

02 Problem
A ball is thrown vertically upwards. Which of the following graphs represents
velocity time graph of ball during its flight ignoring its resistance of air ?

a.

b.

c.

d.

03 Problem

A particle moves along a straight line such that its displacement at any time t is
given by s = t3 – 6t2 + 3t + 4 the velocity when its acceleration is zero, is :

a. 2 m/s
b. 12 m/s
c. - 9m/s
d. 22 m/s

04 Problem

The Refractive index of plastic is 1.25, the polarising angle and the angle of
refraction for light incident at the polarizing angle will be respectively :

a. 51.3, 38.7
b. 61.4, 39.6
c. 71.4, 49.6
d. none of these

05 Problem

The critical angle of a medium with respect to air is 450. The refractive index of
that medium will be :

a. 1.72
b. 1.414
c. 2.12
d. 1.5

06 Problem

A man can not see distinctly an object beyond 5 m. He wants to see the stars. The
focal length of the lens which he must use, is :

a. 5 m
b. 7 m
c. 10 m
d. 2.5 m

07 Problem

The effective length of a magnet is 31.4 cm and its pole strength is 0.5 Am.
Calculate its magnetic moment. If it is bent in form of semicircle, then magnetic
moment will be :

a. 0.157 Am2, 0.01 Am2
b. 0.357 Am2, 0.01 Am2
c. 1.157 Am2, 1.01 Am2
d. none of these

08 Problem

The charge on two identical metallic ball are + 40 C and – 10 C respectively
and they are separated at 2.0 m. How much and nature of force will act
between them ?

a. 2.9 N, repulsive
b. 1.9 N, attractive
c. 1.2 N, repulsive
d. 0.9 N, attractive

09 Problem

The radius of nucleus of silver (atomic number Z = 47) is 3.4 x 10-14 m the electric
potential on the surface of nucleus will be :

a. 1.99 x 106 V
b. 2.99 x 106 V
c. 3.99 x 106 V
d. none of these

10 Problem

The strong, electrostatic and gravitational forces are in the ratio :

a. 1 : 10-8 : 10-48
b. 1 : 10-4 : 10-40
c. 1 : 10-3 : 10-30
d. 1 : 10-2 : 10-34

11 Problem

A battery is charged by a supply of 100 volt as shown in figure. The charging
current is 1.0 A. the value of R is :

a. 88 ohm
b. 68 ohm
c. 44 ohm
d. none of these

12 Problem

A ball is thrown vertically upwards with an initial velocity 1.4 m/s returns in 2
seconds. The total displacement of the ball will be :

a. 22.4 m
b. zero
c. 33.6 m
d. 44.8 m

13 Problem

The capacitance of a metallic sphere is 1μF , then its radius will be :

a. 10 m
b. 1.11 km
c. 9 km
d. 1.11 km

14 Problem

The current gain  of a transistor in common base mode is 0.995. Its gain  in
the common emitter mode is :

a. 200
b. 99
c. 0.995
d. none of these

15 Problem

If an electron is accelerated through a potential drop V of 100 V. It will have the
wavelength equal to :

a. 1100 Å
b. 110 Å
c. 10 Å
d. 1 Å

16 Problem

The ionization potential of mercury is 10.39 V. How far an electron must travel
in an electron must travel in an electric field of 1.5 x 106 V/m to gain sufficient
energy to ionize mercury ?

10.39
a. 6
x 1.0 x 109 m
1.5 x 10
10.39
b. 1.5 x 106
m

c. 1.39 x 1.6 x 10-19 m
10.39
d. 1.6 x 10 19 m

17 Problem

A bucket full of water weights 5 kg, it is pulled from a well 20 m deep. There is a
small hole in the bucket through which water leaks at a constant rate of 0.2 kg/m.
The total work done in pulling the bucket up from the well is (g = 100 m/s2) :

a. 600 J
b. 400 J
c. 100 J
d. 500 J

18 Problem

The magnetic induction at a distance r from the axis of an infinitely straight
conductor which carries current i is :

0 i
a. 2 r

b. 0 i
2r
c. 

d. zero

19 Problem

Two satellites A and B go round a planet in circular orbits having radii 4R and R
respectively. If the speed of the satellite A is 3 , the speed of satellite B will be :

a. 4 /3
b. 3  /2
c. 6 
d. 2 

20 Problem

A proton and an  -particle are accelerated through same potential difference.
The ratio of their de-Broglie wavelength p /  will be :

1
a. 8

b. 8

c. 2
d. 1

21 Problem

Ultraviolet light wavelength 300 nm and intensity 1.0 W/m2 fallson the surface of
photoelectric metal. If one percent of incident photons produce
photoelectrons, then the number of photoelectrons emitted from an area of 1.0
cm2 of the surface is nearly :

a. 2.13 x 1011/sec
b. 1.5 x 1012 /sec
c. 3.02 x 1012/sec
d. none of these

22 Problem

If the number of turns in a coil becomes doubled, then it self inductance will
be :

a. Double
b. Halved
c. Four times
d. Unchanged

23 Problem

A brass sphere immersed completely in water at 00C weighs 1.5 kg. If water is
heated to 500C, with sphere immersed in it all through, the weight of sphere now
is :

a. 1.5 kg
b. > 1.5 kg
c. < 1.5 kg
d. none of these

24 Problem

A particle undergoes a motion described by the equation
 (x, t )  2(sin  t  cos  t )
The amplitude of the motion is :

a. 4 unit
b. 2 2 unit
c. 2 unit
1
d. unit
2

25 Problem

Total energy emitted by a perfectly black body is directly proportional to Tn
where n is :

a. 1
b. 2
c. 3
d. 4

26 Problem

The kinetic energy of electron moving with the velocity of 4 x 106 m/s, will be :

a. 60 eV
b. 50 eV
c. 45 eV
d. 30 eV

27 Problem

A tuning fork of frequency 340 Hz is vibrated just above the tube of 120 cm
height. Water is poured slowly in the tube. What is the minimum height of water
necessary for the resonance ? (speed of sound in air = 340 m/s) :

a. 45 cm
b. 30 cm
c. 45 cm
d. 25 cm

28 Problem

At which temperature, the speed of sound in air will be 1.6 time the speed of
sound in air at 250C ?

a. 5900C
b. 4900C
c. 3900C
d. 2900C

29 Problem

the speed of waves is 360 m/s and frequency is 50 Hz. Phase difference between
two consecutive waves is 600. Path difference between them will be :

a. 0.72 cm
b. 120 cm
c. 0.72 cm
d. 12 cm

30 Problem

Magnifying power of objective of compound microscope is 8. If the magnifying
power of microscope is 32. Then magnifying power of eye piece will be :

a. 7
b. 5
c. 4
d. 3

31 Problem

The current i passed in any instrument in an A.C. circuit is i = 2 sin t amp and
potential difference applied is given by V = 5 cos t volt. Power loss in the
instrument is :

a. 10 watt
b. 5 watt
c. zero watt
d. 20 watt

32 Problem

In A.C. circuit in which inductance and capacitance are joined in series. Current is
found to be maximum when the value of inductance is 0.5 H and the value of
capacitance is 8 .the angular frequency of applied alternating voltage will be :

a. 4000 Hz
b. 5000 Hz
c. 2 x 105 Hz
d. 500 Hz

33 Problem

A water film is formed between two parallel wires of 10 cm length. The distance
of 0.5 cm between the wires is increased by 1 mm. Which will be the work done ?
(Surface tension of water = 72 N/m)

a. 288 erg
b. 144 erg
c. 72 erg
d. 36 erg

34 Problem

Adiabatic modulus of elasticity of a gas is 2.1 x 105 N/m2. What will be its
isothermal modulus of elasticity ?  Cp 
  1.4 
 Cv 

a. 1.2 x 105 N/m2
b. 4 x 105 N/m2
c. 1.5 x 105 N/m2
d. 1.8 x 105 N/m2

35 Problem

The energy of an electron in an excited hydrogen atom is –3.4 eV. Its angular
momentum is :

a. 3.72 x 10-34 Js
b. 2.11 x 10-34 Js
c. 1.57 x 10-34 Js
d. 1.11 x 10-34 Js

36 Problem

The bulk modulus of water is 2 x 109 N/m2. The change in pressure required to
increase the density of water by 0.1% is :

a. 2 x 109 N/m2
b. 2 x 106 N/m2
c. 2 x 108 N/m2
d. 2 x 109 N/m2

37 Problem

In a sinusoidal wave, the time required for a particular point to move from
maximum displacement is 0.17 sec. The frequency of wave is :

a. 2.94 Hz
b. 1.47 Hz
c. 0.73 Hz
d. 0.36 Hz

38 Problem

When a slow neutron is captured by u235 nucleus. A fission results, which release
200 MeV energy. If the output of a nuclear reactor is 1.6 Mwatt. The rate of
nuclei undergoing fission is :

a. 4 x 1016
b. 5 x 1016
c. 3 x 1016
d. none of these

39 Problem

The range of particle when launched at an angle of 150 with the horizontal is 1.5
km. What is the range of the projectile when launched at an angle of 450 to the
horizontal :

a. 3.0 km
b. 1.5 km
c. 6.0 km
d. 0.75 km

40 Problem

In a magnetic field, with the value of induction is 0.9 wb/m2, a simple line
conductor 0.4 m long is moving with the velocity 7 m/s. The value of maximum
induced electromotive force will be :

a. 2 volt
b. 2.52 volt
c. 2 volt
d. 1 volt

41 Problem

A stretched wire, 60 cm long in vibrating with its fundamental frequency 256 Hz.
If the length of the wire is decreased to 15 cm and the tension remains the same,
then the fundamental frequency of the vibration of the wire will be :

a. 1024 Hz
b. 512 Hz
c. 64 Hz
d. 256 Hz

42 Problem

Two immiscible liquids of refractive indices 1.5 and are filled in glass jar each of
length 6 cm. A light of source 5 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

43 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

44 Problem

A torque of 10-5 Nm is required to hold a magnet at 900 with the horizontal
component H of the earth’s magnetic field. The torque required to hold it at 300
is :

a. 5 3 x 10-6 Nm
1
b. x 10-5 Nm
3
c. 5 x 10-6 Nm
d. undefined as H is not given

45 Problem

The unit of Plank’s constant is :

a. Js-1
b. Js
c. Js-2
d. J2s

46 Problem

Heat travels through vacuum by :

a. Radiation
b. Conduction
c. Convection
d. None of these

47 Problem

The velocity of electromagnetic wave in free space is 3 x 108 m/s. The
frequency of radio waves of wavelength 150 m, is :

a. 2 MHz
b. 20 MHz
c. 10 MHz
d. 2 KHz

48 Problem

If threshold wavelength for a certain metal is 2000Å, then the work function of
metal is :

a. 6.2 MeV
b. 6.2 keV
c. 6.2 J
d. 6.2 eV

49 Problem

The magnetic flux liked with the coil is given by the equation   5t 2  3t  16
. The induced e.m.f in the coil in fourth second is :

a. 80 V
b. 40 V
c. 20 V
d. 10 V

50 Problem

If at the same temperature and pressure, the densities for two diatomic gases are
d1 and d2 respectively. Then the ratio of velocities of sound in these gases will be :

2d1
a.
d2

d2
b.
2d1

d1
c.
d2

d2
d.
d1

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AMU - Physics - 2003

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