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 A small telescope has an objective lens of focal
length 150 cm and an eye piece of focal length 5 cm.The magnifying
power of the telescope for viewing distant objects when the final
image is formed at the least distance of distinct vision. a. 60 b.
45 c. 30 d. 36
4. 02 Problem Two thin lenses of same material and focal length
f1 and f2 from an achromatic combination when the lenses are placed
coaxially at a distance d apart so that : f1 f2 a. d = 2 f1f2 b. d
= f1 f2 c. d = f1 f2- f1f2 d. d1 = f1 f2
5. 03 Problem A beam of light of wavelength 600nm from distant
source falls on a single slit 1.0 mm wide and the resulting
diffraction pattern is observed on a screen 2 m away. The distance
between the first dark fringe on either side of the central bright
fringe is a. b. 2.4 mm c. 2.4 cm d. 1.2 cm e. 1.2 mm
6. 04 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 sot when
either of the two slits is closed is I0 then we must have a. I and
I0 are not related b. I=4I0 c. I=I0 d. I=2I0
7. 05 Problem The temperature above which a ferromagnetic
material becomes paramagnetic is called : a. Inversion temperature
b. Debye temperature c. Critical temperature d. Curie
temperature
8. 06 Problem Surface temperature of sun is estimated by
measuring the wavelength at which the intensity of its emitted
radiation is maximum and using : a. Wiens displacement law b.
Stefans law c. Planck law d. Intensity y on Fraunhoffers lines
9. 07 Problem If unit of length, mass and time each be doubled
the unit of work is increased by : a. 8 times b. 4 times c. 6 times
d. 2 times
10. 08 Problem An elevator in which a man is standing is moving
upwards with a speed of 190m/s. If the man drops a ball from a
height of 2.45 m. It reaches the floor of the elevator after a time
: a. 1 sec 2 b. 2 sec 1 c. 2 sec d. 2 sec
11. 09 Problem The time taken by the radio waves, to go and
come back from a communication salellite to the earth is nearly a.
1 sec 1 b. 8 sec 1 c. 4 sec 1 d. 2 sec
12. 10 Problem What should be the angular speed of earth, so
that bodies lying on equator may appear weightless? (take g=10
m/s2, and radius of earth R=6400 km) a. 1.25 x 10-3 rad/sec b. 0.62
x 10-3 rad/ssec c. 2.5 x 10-3 rad/sec d. none of these
13. 11 Problem (3 i 2 j 6k ) (14i 13 j 9k) A particle moves
from post ions to position in meter and a uniform force (4 i j 3k )
N acts on it. The work done by the force will be : a. 150 J b. 50 J
c. 80 J d. 100 J
14. 12 Problem A body of mass 2 kg is given a velocity of 10
m/s on a rough horizontal surface. If coefficient of friction is
0.2 and g=10 m/s2 . The body will stop after covering the distance
of : a. 250 m b. 50 m c. 25 m d. 10 m
15. 13 Problem If the earth suddenly contracts to half its
radius, what should be the length of the day ? by how much would
the duration of the day be decreased? a. 6 hr, 18 hr b. 4 hr,20 hr
c. 8 hr, 16 hr d. None of these
16. 14 Problem A rifle bullet losses 1/2oth of its velocity in
passing through a plank, the least number of such planks required
just to stop the bullet is : a. 22 b. 11 c. 10 d. 5
17. 15 Problem Which one of the graphs shows variation of
magnetic induction with distance r from a long wire carrying
current? a. b. c. d.
18. 16 Problem Two wire loops PORSP by joining two semicircular
wires of radii R-1and R2 carrying current I as shown in figure. The
magnitude of magnetic induction at centre is : 0 i 1 1 a. 4 R1 R2 0
i 1 1 b. 2 R1 R2 0 i 1 1 c. 4 R1 R2 0 i 1 1 d. 4 R1 R2
19. 17 Problem The number of electrons tube put on a spherical
conductor of radius 0.1 m to produce an electric field of 0.036 N/C
just above its surface is : a. 2.5 x 105 b. 2.8 x 105 c. 3 x 105 d.
3.2 x 105
20. 18 Problem A steady current of 5 amp is maintained for 45
minutes. During this time it deposits 4.572 g of zinc at the
cathode of a voltammeter ECE of zinc is : a. 3.394 x 10-3 g coulomb
b. 3.894 x 10-3 g coulomb c. 3.387 x 10-3 g coulomb d. None of
these
21. 19 Problem A galvanometer of resistance 25 gives full scale
deflection for current of 10 mA is to be changed into a voltmeter
of range 100 V by connecting a resistance of R in series with
galvanometer. The value of resistance is : a. 9975 b. 8975 c. 10020
d. 10000
22. 20 Problem If the number of turns in a coil becomes doubled
then its self inductances will be: a. Unchanged b. Four times c.
Halved d. Doubled
23. 21 Problem A current i is flowing in rectangular loop. It
is put close in wire (long and straight) such that wire is parallel
to one of the arms of loop and lies in the plane of loop. If a
steady current I flows in the wire, the loop: a. Will remain steady
b. Will move towards the wire c. Will move a away from the wire d.
Will rotate about an axis parallel to wire
24. 22 Problem The numbers of turns of primary and secondary
coils of transformer are 5 and 10 respectively and the mutual
inductance of the transformer is 25 H. now the numbers of turns in
the primary and secondary of the transformer are made 10 and 5
respectively. The mutual inductance of the transformer will be: a.
50henry b. 25henry c. 12.5henry d. 6.25henry
25. 23 Problem A wire of length L meter carrying a current I
ampere is bent in the form of a circle. Its magnitude of magnetic
moment will be: a. Li 2 4 i 2 L2 b. 4 iL2 c. 4 l d. L 4
26. 24 Problem A proton and an - particle are accelerated
through the same potential difference the ratio of their de Broglie
wavelengths p / will be: 1 a. 8 b. 8 c. 2 d. 1
27. 25 Problem Ultra violet light wavelength 3.00 nm and
intensity 1.0 W/m2 falls on the surface of or photoelectric
material. If one percent of incident photons produce
photoelectrons. Then the number of photoelectron emitted from an
area of 1.0 cm2of the surface is nearly: a. 2.13 x 1011/sec b. 1.52
x 1012/sec c. 3.02 x 1012/sec d. None of these
28. 26 Problem An -particle of 10 MeV colloids head on with
copper nucleus (Z=29) and is deflected back. What s the maximum
limit of radius of copper nucleus is ? a. 10.4x10-15 m b. 6.4x10-15
m c. 4.2x10-15 m d. 8.4x10-15 m
29. 27 Problem The ratio of energy of orbital electron in
fourth and fifth orbit of hydrogen atom will be: a. 16:25 b. 4:5 c.
25:16 d. 5:4
30. 28 Problem A freshly prepared radioactive source of half
life 2 hours emits radiation of intensity of which is 64 times the
permissible safe level. The minimum time after which would be
possible to work safely with this source is: a. 4 hrs b. 24 hrs c.
6 hrs d. 12 hrs
31. 29 Problem When a slow neutron is captured by a U235
nucleus. A fission result which releases 200 MeV energy. If the
output of a nuclear reactor is 1.6 MW. The rate of nuclei
undergoing fission, will be: a. 5x1016 b. 3x1066 c. 4x1016 d. None
these
32. 30 Problem The dominant mechanism for motion of charge
carries n forward and reverse biased silicon p-n junction is: a.
Drift in both forward and reverse biased b. Diffusion in both
forward and reverse biased c. Diffusion in forward biased and drift
in reverse biased d. Drift in forward biased and diffusion in
reverse biased
33. 31 Problem A radio waves of frequency 840 Hz is sent
towards aeroplane. The frequency of 2.8 kHz more than the original
frequency then velocity of aeroplane is : a. 0.5 km/sec b. 5 km/sec
c. 0.25 km/sec d. None these
34. 32 Problem A transistor with = 0.95 is operated as an
amplifier in a common base circuit with a load resistance of 5kW .
If the dynamic resistance of the emitter base junction is 70 . The
voltage gain and power gain of the circuit will be: a. 70,68.6 b.
72,70.6 c. 74,72.2 d. None these
35. 33 Problem A ideal gas expands according to the law
PV2=constant. The value of molar heat capacity: a. Cv R Cv R b. 2
c. R- Cv d. None of these
36. 34 Problem Water falls through a height of 250 m. Assuming
that whole of energy is converted into heat the rise in temperature
of water will be: (g = 9.8 m/s2, J = 4.18 x103J/kilocal) a. 0.590C
b. 1.590C c. 2.570C d. None of these
37. 35 Problem An electric bulbs of volume 25 cm3 was sealed
off during manufacture at a pressure of 10-3 mm of Hg at 270C. The
number of molecules in the bulb will be : a. 4x105 b. 6x105 c.
7.05x105 d. 8.05x105
38. 36 Problem The time period of a seconds pendulum is 2 sec
.The spherical bob which is empty from inside has a mass 50 gram
this now replaced by another solid of same radius but have
different mass of 100 gram. The new time period will be: a. 2 sec
b. 8 sec c. 4 sec d. 1 sec
39. 37 Problem Van de Graffe generator is used to: a. Compare
high D.C. potential b. Produce high A.C. potential c. Measure high
potential difference d. Produce high D.C. potential
40. 38 Problem The force between the plate of a charged
parallel plate capacitor is: a. q2 F 2 0A b. F q 2 0A c. q2 F 0A d.
none of these
41. 39 Problem A colour coded carbon resistor has the scheme
(as shown in fig), then the colour coded resistance will be : a.
52000 10% b. 53000 10% c. 62000 10% d. none of these
42. 40 Problem A particle is particle is executing S.H.M., the
potential energy of the particle is maximum at: a. Same at all
position b. Midway between mean and extreme position c. Mean
position d. Extreme position
43. 41 Problem Two perfect gases at absolute temperature T1 and
T2 are mixed, there is so loss of energy then the temperature of
the mixture if masses are m1 and m2 and the number of molecules are
n1 and n2 respectively will be: a. n1T1 n2T2 n1 n2 b. n2T1 n1T2
2(n1 n2 ) n2T1 n1T1 c. n1 n2 n1T1 n2T2 d. n1 n2
44. 42 Problem At 27oC temperature, then mean kinetic energy
per molecule of an ideal gas is E1. If the temperature is increased
to 3270C the mean kinetic energy would be ; a. E1 2 2 b. E E1 c. 2
d. 2 E
45. 43 Problem The bulk modulus of water is 2x109N/m2 the
change in pressure required to increases the density of water by
0.1% is: a. 2x104 N/m2 b. 2x106 N/m2 c. 2x108 N/m2 d. 2x109
N/m2
46. 44 Problem In a sinusoidal wave, the time required for a
particle point to move from maximum displacement is 0.17 sec. The
frequency of wave is: a. 2.94 Hz b. 1.97 Hz c. 0.73 Hz d. 0.36
Hz
47. 45 Problem 1 1 The mass f moon is 81 of the earths mass and
its radius is 4 that of earth . If the escape velocity from the
earths surface is 11.2 km/sec. The value of escape velocity on the
moon will be: a. 5 km/s b. 2.5 km/s c. 7.5 km/s d. 2.1 km/s
48. 46 Problem The strong, electrostatic and gravitation forces
are in the ratio: a. 1:10-8 :10-48 b. 1:104 :1040 c. 1:10-3 :10-30
d. 1:10-2 :10-34
49. 47 Problem The gravitational force is given by F 4k. The
work done in transporting a mass of 2 kg from (0,0,0) to (4,3,5) m
by a external source is : a. 15 J b. 10 J c. 50 J d. 20 J
50. 48 Problem A hammer weighing 2.5 kg moving with a speed of
1 m/s strikes the head of the nail driving it 10 cm into the wall.
The acceleration during impact and the impulse imparted to wall
will be respectively: a. -5m/s2, 2.5Ns b. -10m/s2, 5 Ns c. -7.5
m/s2, 3.5 Ns d. None of these
51. 49 Problem A projectile can have the same range for two
angles of projection. If h1 and h2 are maximum heights when the
range in the two cases is R, then the relation between R, h1 and h2
is : a. R = 4 h1 h2 b. R = 2 h1 h2 h1 h2 c. R = d. None of
these
52. 50 Problem When the kinetic energy of a body is increased
by three times, then the momentum increases: a. 6 times b. 1.732
times c. 2 times d. 3 times