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6. Which one of the following is used as a moderator in nuclear reactor
  • A. radium
  • B. graphite
  • C. thorium
  • D. ordinary water
7. Which one among the following radiations carries maximum energy?
  • A. gamma rays
  • B. x–rays
  • C. infra red rays
  • D. ultraviolet rays
8. Which one of the following remains constant while throwing a ball upward?
  • A. velocity
  • B. displacement
  • C. acceleration
  • D. kinectic energy
9. Which one of the following is the unit of activity of a radioactive source?
  • A. Siemens
  • B. Lux
  • C. Tesla
  • D. Becquerrel
10. Which one of the following common devices works on the basis of the principle of mutual induction?
  • A. LED
  • B. Transformer
  • C. Photodiode
  • D. Tube light