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Physics Questions and Answers

189. Sound travels at maximum speed in
 
  • A. steel
  • B. air
  • C. vacuum
  • D. steel
 
 
190. The process responsible for the enormous energy in the sun is
 
  • A. nuclear fission
  • B. nuclear fusion
  • C. the buring of gases
  • D. none of these
 
191. The process of nuclear fission occurs mainly in
 
  • A. the sun
  • B. the hydrogen bomb
  • C. chemical reactions
  • D. nuclear reactors
 
192. The positron is called the antiparticle of the electron, because it
 
  • A. has opposite charges
  • B. has same mass
  • C. collides with an electron
  • D. annihilates with an electron