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# AFMC Physics 1996

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• 1. AFMC–Past papers
PHYSICS- UNSOLVED PAPER - 1996
• 2. SECTION – A
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. Problem
01
A ball is dropped from 10m. it is embedded in sand by 15 mm and then stops, which of the following is conserved?
Temperature
Momentum
Kinetic energy
Both (a) and (c)
• 4. Problem
02
If we consider electrons and photons of the same wavelength, then they will have same
Momentum
Energy
Angular momentum
Velocity
• 5. Problem
03
Equation for the change of state was given by
Newton
Clausius
Clausius-clapeyron
Joules
• 6. Problem
04
If n small balls, each of mass m impinge elastically each second on a surface with a velocity u, then the force experienced by the surface in one second will be
0.5 mnu
1 mnu
2 mnu
4mnu
• 7. Problem
05
Velocity of light is maximum in
Glass
Diamond
Vacuum
water
• 8. Problem
06
The equation of sound wave is Y=0.0015 sin(62.4x+316t) the wavelength of this wave is
0.2 unit
0.1 unit
0.3 unit
0.4 unit
• 9. Problem
07
In an adiabatic expansion of a gas
Temperature is kept constant
Heat is gained or lost
Volume is kept constant
Heat is neither gained nor lost
• 10. Problem
08
The dew point and atmospheric temperature on a particular day is found to be 180 c and 250c. if saturation vapour pressure at 180c 250c be 15.5 mm and 25.7 mm of Hg, its relative humidity is
90%
30.0%
Not possible to calculate
60.3%
• 11. Problem
09
The surface tension of a liquid is 108 dyne/cm2. It is equivalent to
105 N/m
107 N/m
104 N/m
106 N/m
• 12. Problem
10
When the key K is pressed at time t = 0, then which of the following statement about the current I in the resistor AB of the given circuit is true?
I oscillates between 1 mA and 2mA
I = 1 mA at all t
At t=0, I=2mA and with time it goes to 1mA
I = 2mA and at all t
• 13. Problem
11
Davy’s safety lamp is based on
Convection
Polarization
Conduction
• 14. Problem
12
R.M.S velocity of a particle is v at pressure P. If the pressure increases by two times, then R.M.S velocity will become
2 v
0.5 v
4 v
v
• 15. Problem
13
light waves are transverse, because they
are polarized
reflect
are not polarized
refract
• 16. Problem
14
In a hydrogen discharge tube, it is observed that through a given cross-section 3.13 x 1015 electrons are moving from right to left and 3.12*1015 protons are moving from left to right. What is the electric current in the discharge tube and what is its direction?
2 mA towards right
1 mA towards right
2 mA towards left
1 mA towards left
• 17. Problem
15
When current flows in a conductor, then the ratio of the intensity of electric field E at any point within the conductor and the current density at a point is called
Specific resistance
Resistance
Inductance
Conductance
• 18. Problem
16
A man is standing on a spring platform. Reading of spring balance is 60 kg wt. if man jumps outside from the platform, then reading of spring balance.
Decrease to zero
Increase
Remain same
First (b) then (a)
• 19. Problem
17
A thermo flask is polished well
To absorb all radiation from outside
To make attractive
To reflect all radiation from outside
For shining
• 20. Problem
18
What percent of original radioactive atoms is left after five half-lives?
5%
20%
3%
10%
• 21. Problem
19
If the coefficient of friction of a plane inclined at 300 is 0.4 then acceleration of a body sliding freely on it is (g = 9.8m/s2)
4.9 m/s2
9.8 m/s2
2.54 m/s2
1.51 m/s2
• 22. Problem
20
If current flowing in a conductor changes by 1%, then power will change by
10%
1%
100%
2%
• 23. Problem
21
Coefficient of performance of an ideal refrigerator working between temperatures T1 and T2 (T1>T2) is
a.
b.
c.
d.
• 24. Problem
22
If an electron jumps from 1st orbit to 3rd orbit, then
No gain of energy
Absorb energy
No loss of energy
Release energy
• 25. Problem
23
The unit of R in the general gas equation is
a.
b.
c.
d.
• 26. Problem
24
in a coil of self-inductance % henry, the rate of change of current is 2 ampere per second e.m.f induced in the coil is
10 V
-10 V
5 V
-5 V
• 27. Problem
25
Myopia is due to
Shortening of eye ball
Older age
Elongation of eye ball
Change in focal length
• 28. Problem
26
If the new velocity of a body is twice its previous velocity, then kinetic energy will become
4 times
2 times
6 times
0.5 times
• 29. Problem
27
The laplace correction was necessary to newton’s calculation of velocity of sound, because travel of sound in a medium is
Isobaric process
Isothermal process
Isochoric process
• 30. Problem
28
An electric lamp is connected to 220 V, 50Hz supply. The peak voltage is
311 V
210 V
320 V
211 V
• 31. Problem
29
The discoverer of loudness and intensity of sound is
Laplace
Newton
Edison
Bell
• 32. Problem
31
Which of the following is not a unit of time?
Micro-second
Hour
Light year
Niño-second
• 33. Problem
32
The time period of a simple pendulum in a satellite is
Zero
Unity
Same as an earth
Infinity
• 34. Problem
32
Which of the following is the smallest unit?
Fermi
Millimeter
Metre
Angstrom
• 35. Problem
33
The phenomenon of production of e.m.f in a current carrying metallic strip on applying a magnetic field along a direction perpendicular to the direction of flow of current is known as
Seeback effect
Hall effect
Peltier effect
Joule effect
• 36. Problem
34
Resonance is a special case of
Damped vibration
Forced vibration
Un-damed vibration
Natural vibration
• 37. Problem
35
If magnetic material, which moves from stronger to weaker parts of a magnetic field, then it is known as
Diamagnetic
Paramagnetic
Ferromagnetic
Anti-ferromagnetic
• 38. Problem
36
What is the magnitude of magnetic force per unit length of a wire carrying a current of 5 A and making an angle of 300 with direction of a uniform magnetic field of 0.1 T?
0.25 N-m
0.35 N-m
0.45 N-m
0.55 N-m
• 39. Problem
37
Lightning was discovered by
Ohm
Thomson
Franklin
• 40. Problem
38
A string attached with a bob of mass m oscillates from A to C and back to A such that PB is H. if the acceleration due to gravity is g, then the velocity of the bob as it passes through B is
mgH
Zero
√2gH
2gH
• 41. Problem
39
Thermal conductivity depends on
Difference in temperature
Nature of material
Atmospheric temperature
Heat produced
• 42. Problem
40
Half-life of radioactive material depends on
Material’s amount
Temperature
Disintegration medium
Nature of material
• 43. Problem
41
The evaporation of a liquid from its surface is based on
Thomson’s law
Joule’s law
Bernoulli’s law
Stefan’s law
• 44. Problem
42
In an equilateral triangular prism, the angle of minimum deviation for a certain wavelength is 400. The corresponding angle of incidence is
300
400
450
500
• 45. Problem
43
If vector A and B has angle Ѳ between them, then vector product is
AB
AB cosѲ
A x B xcos Ѳ
AB sin Ѳ
• 46. Problem
44
Which of the following cannot be resultant of 5 and 10?
5
8
2
7
• 47. Problem
45
What is the mass of a silver atom? (Avogadro’s no.=6.022*1023 mol-1 and atomic mass of silver = 108)
120.12 x 10-31 kg
17.93 x -26 kg
17.93 x 10-33 kg
16.81 x 10-29 kg
• 48. Problem
46
92U235 and 92U238 differ as
92U238 has 3 neutrons more
92U235 has 2 protons less
92U235 has 3 protons less
None of these
• 49. Problem
47
A rocket is based on ht principle of
Conservation of linear momentum
Conservation of angular momentum
Both (a) and ( b)
None of these
• 50. Problem
48
The radius of gyration of a disc of mass 50g and radius 2.5 cm about an axis passing through its centre of gravity and perpendicular to the plane is
0.52 cm
1.76 cm
3.54 cm
6.54 cm
• 51. Problem
49
The minimum number of non-collinear vectors required to produce a zero vector is
2
1
4
3
• 52. Problem
50
The dimension of angular velocity is
[M0L0T-1]
[M0LT-2]
[ML1T-1]
[M0LT-1]
• 53. For solution visit www.vasista.net