Class VII

Gamma rays are also used to check the
  1. strength of metals
  2. strength of concrete
  3. thickness of metal
  4. properties of metal
A large amount of heat is produced in power plants while energy is released which turns
  1. black rods into orange
  2. water into steam
  3. ice into water
  4. Acid into alkali
Gamma rays are used to detect
  1. faults in human body
  2. faults in metals
  3. thieves and robbers
  4. weapons
Symbol of Helium is
  1. H
  2. He
  3. Na
  4. Hy
Symbol of Boron is
  1. Bo
  2. C
  3. N
  4. Br
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