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Physics Questions and Answers

153. Which one of the following layers of the atmosphere is responsible for the reflection of radio waves?
 
  • A. Stratosphere
  • B. Mesosphere
  • C. Ionosphere
  • D. Troposhere
 
 
154. The substance used for the softening of hard water is
 
  • A. copper sulphate
  • B. sodium carbonate
  • C. sodium hydroxide
  • D. sodium chloride
 
155. The energy gap of diamond is
 
  • A. 1 ev
  • B. 2 ev
  • C. 7 ev
  • D. 10 ev
 
156. When water freezes into ice the density
 
  • A. increases
  • B. decreases
  • C. remains constant
  • D. disappears