Physics · NDA previous year questions

2012 35 questions

1. Q872012 · 15 Apr 2012

   Body A of mass $2\mathrm{kg}$ and another body B of mass $4\mathrm{kg}$ and of same material are kept in the same sunshine for some interval of time. If the rise in temperature is equal for both the bodies, then which one among the following in this regard is correct?

   1. A.Heat absorbed by B is double because its mass is double
   2. B.Heat absorbed by A is double because its mass is half
   3. C.Heat absorbed by both A and B is equal because the quantity of heat absorbed does not depend upon mass
   4. D.Heat absorbed by B is four times than the heat absorbed by A because the quantity of heat absorbed is proportional to square of the mass
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   Answer: A

2. Q892012 · 15 Apr 2012

   Which one among the following is not produced by sound waves in air?

   1. A.Polarization
   2. B.Diffraction
   3. C.Reflection
   4. D.Refraction
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   Answer: A

3. Q902012 · 15 Apr 2012

   A body attached to a spring balance weighs 10 kg on the Earth. The body attached to the same spring balance is taken to a planet where gravity is half that of the Earth. The balance will read

   1. A.20 kg
   2. B.10 kg
   3. C.5 kg
   4. D.2·5 kg
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   Answer: C

4. Q912012 · 15 Apr 2012

   The resistance of a wire is 10 Ω. If it is stretched ten times, the resistance will be

   1. A.1 Ω
   2. B.10 Ω
   3. C.100 Ω
   4. D.1000 Ω
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   Answer: D

5. Q922012 · 15 Apr 2012

   If the focal length of the biconvex lens is 25 cm, then the power of the lens will be

   1. A.+4 dioptre
   2. B.−4 dioptre
   3. C.+0·04 dioptre
   4. D.−0·04 dioptre
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   Answer: A

6. Q932012 · 15 Apr 2012

   The thermal conductivity of copper is 4 times that of brass. Two rods of copper and brass having same length and cross-section are joined end to end. The free end of copper is at 0 °C and the free end of brass is at 100 °C. The temperature of the junction is

   1. A.20 °C
   2. B.40 °C
   3. C.60 °C
   4. D.10 °C
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   Answer: A

7. Q942012 · 15 Apr 2012

   The torque on a rectangular coil placed in a uniform magnetic field is large when the

   1. A.number of turns is large
   2. B.number of turns is less
   3. C.plane of the coil is perpendicular to the magnetic field
   4. D.area of the coil is small
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   Answer: A

8. Q962012 · 15 Apr 2012

   Two thin convex lenses of focal lengths 4 cm and 8 cm are separated by a distance of 4 cm in air. The combination will have the focal length

   1. A.4 cm
   2. B.8 cm
   3. C.12 cm
   4. D.32 cm
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   Answer: A

9. Q972012 · 15 Apr 2012

   For which among the following house appliances, magnet is an essential part?

   1. A.Calling bell
   2. B.Fan
   3. C.Washing machine
   4. D.All of the above
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   Answer: D

10. Q992012 · 15 Apr 2012

    To obtain the powerful parallel beams of light from a vehicle’s headlight, one must use

    1. A.front surface silvered plane mirror
    2. B.back surface silvered plane mirror
    3. C.concave mirror
    4. D.convex mirror
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    Answer: C