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Physics Questions and Answers

169. The science of Cryogenics deals with
 
  • A. high temperature
  • B. low temperatures
  • C. molecular biology
  • D. biotechnology
 
 
170. Which one of the following is a physical change?
 
  • A. rusting of iron
  • B. boiling of water
  • C. burning of candle
  • D. boiling of an egg
 
171. At sunrise and at sunset the sky appears red, because
 
  • A. red light scatters more
  • B. red light scatters less
  • C. red light’s intensity is more
  • D. none of the above
 
172. The sky appears to be blue because of
 
  • A. reflection of light
  • B. refraction of light
  • C. scattering of light
  • D. total internal reflection of light