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# AFMC Physics 1995

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• 1. AFMC–Past papers
PHYSICS- UNSOLVED PAPER - 1995
• 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
In figure the potentiometer wire AB has a resistance of 5Ω and length 10 m the balancing length AJ for the e.m.f of 0.4 V is
0.8m
4m
0.4m
1.5m
• 4. Problem
02
The primary winding of a transformer has 500 turns whereas its secondary has 5000 turns. The primary is connected to an AC supply 20 V, 50 Hz. The Secondary will have an output of
2 v , 50 Hz
200V, 50 Hz
2V, 5Hz
200V, 500Hz
• 5. Problem
03
The blue color of the sky is due to the phenomenon of
Scattering
Reflection
Dispersion
Refraction
• 6. Problem
04
The capacity of a parallel plate capacitor increases with the
Increase of its area
Decrease of its area
Increase of its distance
None of these
• 7. Problem
05
A student has 10 resistors of resistance r. The minimum resistance made by him from the give resistors is
r/100
10r
r/5
r/10
• 8. Problem
06
Which one of the following gates correspond to the truth table given below
NAND
XOR
NOR
OR
• 9. Problem
07
Which of the following quantity is expressed as force per unit area?
Volume
Work
Area
Pressure
• 10. Problem
08
The displacement-time graph of a moving particle is shown below. The instantaneous velocity of the particle is negative as the point
E
F
C
D
• 11. Problem
09
The equation constant. The unit of a is
Dyne/cm3
Dyne/cm5
Dyne x cm2
Dyne x cm4
• 12. Problem
10
Water falls from a height of 800 m. if whole of its energy changes to heat, what would be the rise in its temperature when it reaches the ground (1 kcal=4200J)
1.860c
1.180c
00c
0.530c
• 13. Problem
11
The twinkling of stars is due to the
Refractive index of the earth’s atmosphere fluctuates
Fact that stars do not emit light continuously
Both (a) and (b)
None of these
• 14. Problem
12
At sun rise or sunset, the sun looks more red than at mid-day, because of the
Effects of refraction
Sun is hottest at these times
Effects of diffraction
Scattering of light
• 15. Problem
13
The volume of atoms to the volume of nit cell is called
Coordination number
Packing fraction
Lattice parameter
Packing coefficient
• 16. Problem
14
a body moves due east with velocity 20km/hour and then due north with velocity 15 km/hour. The resultant velocity
20 km/hour
5 km/hour
25 km/hour
15 km/hour
• 17. Problem
15
A dip circle is at right angle to the magnetic meridian. What will be its apparent dip?
600
00
900
300
• 18. Problem
16
Six resistors of 3Ω each are connected along the sides of a hexagon and three resistors of 6Ω each are connected along AC, AD and AE as shown in the figure. The equivalent resistance between A and B is equal to
2 Ω
3 Ω
6 Ω
9 Ω
• 19. Problem
17
The direction of magnetic field line of bar magnet is
Across the bar magnet
From south pole to north pole
From south pole to north pole inside the magnet and from north pole to south pole outside the magnet
From north pole to south pole
• 20. Problem
18
When Ge crystals are doped with phosphorus atom, then it becomes
n-type semiconductor
insulator
superconductor
p-type semiconductor
• 21. Problem
19
In which radioactive disintegration, neutron dissociates into proton and electron?
λ- emission
He++ emission
Positron emission
Β-emission
• 22. Problem
20
The focal length of convex lens is 30cm and the distance of image is quarter of the object, then the object distance is
40cm
90cm
30cm
60cm
• 23. Problem
21
When the number of turns and length of a solenoid are doubled, keeping the area of cross-section same, the inductance
Is doubled
Is halved
Becomes four times
Remains the same
• 24. Problem
22
A solenoid is at potential difference of 60V. if the current flowing through it is 15 ampere, then resistance of the coil will be
0.25 Ω
4 Ω
2 Ω
8 Ω
• 25. Problem
23
Bending of light about the corner of an obstacle sharp edged is called
Polarization
Deviation
Diffraction
Dispersion
• 26. Problem
24
If a source of light is moving away from a stationary observer, then frequency of light wave appears to change because of
Diffraction
Doppler’s effect
Refraction
Interference
• 27. Problem
25
The reciprocal of resistance is
Voltage
Conductance
Current
Resistivity
• 28. Problem
26
In the case of forward biasing of p-n junction, which one of the following figures correctly depicts the direction of flow of carriers?
a.
b.
c.
d.
• 29. Problem
27
A galvanometer is converted into ammeter, when we connect
Low resistance in series
High resistance in series
Low resistance in parallel
High resistance in parallel
• 30. Problem
28
In an experiment with Kund’s tube the distance between consecutive nodes is 5 cm when air is inside, and it is 13.4 cm when hydrogen is inside calculate the velocity of sound in hydrogen(speed of sound in air = 330m/s)
424m/s
884.4 m/s
1024.8 m/s
864.4 m/s
• 31. Problem
29
The splitting of line into groups under the effect of electric or magnetic field is called
Heisenberg's effect
Bohr’s effect
Magnetic effect
Zeeman’s effect
• 32. Problem
30
Two open organ pipes of length 25 cm and 25.5 cm produce 0.1 beats/sec. the velocity of sound is
303 m/s
350 m/s
255 m/s
325.5 m/s
• 33. Problem
31
On the absolute scale of temperature given by Kelvin, steam point has a value of
-273 K
373 K
0 K
273 K
• 34. Problem
32
If the radius of curvature of convex mirror is 40 cm and distance of image is twice as that of object, then the object distance is
30 cm
60 cm
20 cm
40 cm
• 35. Problem
33
The minimum energy required to remove an electron is called
Stopping potential
Work function
Potential energy
Kinetic energy
• 36. Problem
34
Two waves of the same frequency and intensity superimpose with each other in opposite phases after the superposition, the
Frequency increases by 4 times
Intensity increases by 4 times
Intensity increases by two times
None of these
• 37. Problem
35
The sensitivity of a tangent galvanometer is increased, if
Field is increased
Number of turns decreased
Field is decreased
Number of turns increased
• 38. Problem
36
The resistance of a wire is R. If the length of the wire is doubled, then its resistance will be
R
2R
0.25 R
4 R
• 39. Problem
37
Which of the following has a negative temperature coefficient?
Man
C
Ag
Fe
• 40. Problem
38
Radiation emitted by a surface is directly proportional to
Twice power of its temperature
Third power of its temperature
Equal to its temperature
Fourth power of its temperature
• 41. Problem
39
A rectangle ABCD is such that BC = 2 AB. The moment of inertia along axis will be minimum through
HF
BC
EG
BD
• 42. Problem
40
In an isothermal expansion, the pressure is determined by
Compressibility only
Temperature only
Both (a) and (b)
None of these
• 43. Problem
41
Monochromatic light wave means
A beam of white colour
A beam of the same colour
A cluster of beam of different colours
None of these
• 44. Problem
42
Time period of a simple pendulum will be double, if we
Decrease the length 4 times
Increase the length 4 times
Decrease the length 2 times
Increase the length 2 times
• 45. Problem
43
Soap bubble appears coloured due to the phenomenon of
Dispersion
Interference
Reflection
Diffraction
• 46. Problem
44
The translational kinetic energy of gas, for one mole of the gas, is equal to
a.
b.
c.
d.
• 47. Problem
45
If we move from equator to pole, the value of g
Remains the same
Increases
Decreases
First (b) then (c)
• 48. Problem
46
If the critical temperature of CO2 is 31.10C and room temperature is 400C, then CO2 behaves as
Liquid
Gas
Gas and vapour
Vapour
• 49. Problem
47
The minimum wavelength of the X-rays produced by electrons accelerated through a potential difference of V volts is directly proportional to
1/√V
√V
1/V
V2
• 50. Problem
48
A bullet of mass 0.1 kg is fired with a speed of 100m/sec, the mass of gun is 50 kg. The velocity of recoil is
0.5 m/sec
0.2 m/sec
0.05 m/sec
0.1 m/sec
• 51. Problem
49
A hollow metallic sphere of radius 10 cm is charged such that potential of its surface is 70 volts. The potential at the centre of the sphere would be
70V
0V
700V
7V
• 52. Problem
50
A ball is thrown upwards with a velocity of 100m/sec. it will reach the ground after
10 sec
40 sec
5 sec
20 sec
• 53. For solution visit www.vasista.net