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8 questions · 2003 · answers as per the UPSC key

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UPSC 2003 · Q8 · Science & Technology › Physics · Save

A hydrogen-inflated polythene balloon is released from the surface of the earth. As the balloon rises to an altitude up in the atmosphere, it will

(a) Decrease in size
(b) Flatten into a disc-like shape
(c) Increase in size
(d) Maintain the same size and shape
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Answer: (c) Increase in size
UPSC 2003 · Q22 · Science & Technology › Physics · Save

Consider the following statements:

  1. Steam at 100 °C and boiling water at 100 °C contain the same amount of heat.
  2. Latent heat of fusion of ice is equal to the latent heat of vaporization of water.
  3. In an air-conditioner, heat is extracted from the room air at the evaporator coils and is rejected out at the condenser coils.

Which of these statements is/are correct?

(a) 1 and 2
(b) 2 and 3
(c) Only 2
(d) Only 3
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Answer: (d) Only 3
UPSC 2003 · Q26 · Science & Technology › Physics · Save

Consider the following statements: A four-wheel vehicle moving on a sharp circular path at high speed will

  1. Overturn about its outer wheels.
  2. Overturn about its inner wheels.
  3. Skid outwards.
  4. Skid inwards.

Which of these statements are correct?

(a) 1 and 3
(b) 2 and 4
(c) 2 and 3
(d) 1 and 4
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Answer: (a) 1 and 3
UPSC 2003 · Q31 · Science & Technology › Physics · Save

Diffusion of light in the atmosphere takes place due to

(a) Carbon dioxide
(b) Dust particles
(c) Helium
(d) Water vapours
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Answer: (b) Dust particles
UPSC 2003 · Q37 · Science & Technology › Physics · Save

An oil tanker is partially filled with oil and moves forward on a level road with uniform acceleration. The free surface of oil then

(a) Remains horizontal
(b) Is inclined to the horizontal with smaller depth at the rear end
(c) Is inclined to the horizontal with larger depth at the rear end
(d) Assumes parabolic curve
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Answer: (c) Is inclined to the horizontal with larger depth at the rear end
UPSC 2003 · Q63 · Science & Technology › Physics · Save

Which one of the following statements is correct?

(a) The velocity of sound in air increases with the increase of temperature
(b) The velocity of sound in air is independent of pressure
(c) The velocity of sound in air decreases as the humidity increases
(d) The velocity of sound in air is not affected by the change in amplitude and frequency
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Answer: (c) The velocity of sound in air decreases as the humidity increases
UPSC 2003 · Q79 · Science & Technology › Physics · Save

If the radius of the earth were shrunk by one per cent, its mass remaining the same, the value of ‘g’ on the earth’s surface would

(a) increase by 0.5%
(b) increase by 2%
(c) decrease by 0.5%
(d) decrease by 2%
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Answer: (b) increase by 2%
UPSC 2003 · Q98 · Science & Technology › Physics · Save

Regarding the atom of a chemical element, the magnetic quantum number refers to

(a) orientation
(b) shape
(c) size
(d) spin
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Answer: (a) orientation