Solar radiation is preferred to other sources of energy because

A. it is practically inexhaustible

B. it is the cheapest form of energy

C. it does not cause pollution

D. All of the above

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  1. Of the following which has got the highest frequency?
  2. Tap water is placed in an open pad and allowed to evaporate. After some time the temperature of water
  3. The power of a lens is
  4. A photon is
  5. When a whistling engine approaches a person standing on the platform, the frequency or the note
  6. The Cact that the compass needle does not point true north was observed first by
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  9. In the ramous equation of Einstein E = mc2 , 'c' denotes.
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  16. Echoes are produced by
  17. In a river, the currents are fastest where the river la
  18. Where does the centre of gravity of a rubber ring lie?
  19. The rate of cooling of a hot body depends on
  20. The electrical domestic tube light gives white fiourescent light because of
  21. The presence of impurities
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