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4 questions · 2010 · answers as per the UPSC key

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UPSC 2010 · Q2 · Science & Technology › Physics · Save

If a potato is placed on a pure paper plate which is white and unprinted and put in a microwave oven, the potato heats up but the paper plate does not. This is because

(a) Potato is mainly made up of starch whereas paper is mainly made up of cellulose
(b) Potato transmits microwaves whereas paper reflects microwaves
(c) Potato contains water whereas paper does not contain water
(d) Potato is a fresh organic material whereas paper is a dead organic material
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Answer: (c) Potato contains water whereas paper does not contain water
UPSC 2010 · Q34 · Science & Technology › Physics · Save

India-based Neutrino Observatory is included by the Planning Commission as a mega science project under the 11th Five-Year Plan. In this context, consider the following statements:

  1. Neutrinos are chargeless elementary particles that travel close to the speed of light.
  2. Neutrinos are created in nuclear reactions of beta decay.
  3. Neutrinos have a negligible, but non-zero mass.
  4. Trillions of Neutrinos pass through human body every second.

Which of the statements given above are correct?

(a) 1 and 3 only
(b) 1, 2 and 3 only
(c) 2, 3 and 4
(d) 1, 2, 3 and 4
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Answer: (d) 1, 2, 3 and 4
UPSC 2010 · Q88 · Science & Technology › Physics · Save

What is the principle by which a cooling system (Radiator) in a motor car works?

(a) Conduction only
(b) Convection
(c) Radiation only
(d) Both conduction and radiation
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Answer: (b) Convection
UPSC 2010 · Q108 · Science & Technology › Physics · Save

Indiscriminate disposal of used fluorescent electric lamps causes mercury pollution in the environment. Why is mercury used in the manufacture of these lamps?

(a) A mercury coating on the inside of the lamp makes the light bright white
(b) When the lamp is switched on, the mercury in the lamp causes the emission of ultra-violet radiations
(c) When the lamp is switched on, it is the mercury which converts the ultra-violet energy into visible light
(d) None of the statement given above is correct about the use of mercury in the manufacture of fluorescent lamps
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Answer: (b) When the lamp is switched on, the mercury in the lamp causes the emission of ultra-violet radiations