328. A proton is
   (a) a quantum of light energy
   (b) a quantum of matter
   (c) a positively charged atomic particle
   (d) another name for positron
Ans: (c)
329. A proton is
   (a) the ionised hydrogen molecule
   (b) the nucleus of helium atom
   (c) the nucleus of hydrogen atom
   (d) the positive counterpart of electron
Ans: (c)
330. The enormous energy released in nuclear and thermonuclear reactions is
   due to conversion of
   (a) chemical energy into heat energy
   (b) mechanical energy into heat energy
   (c) protons into neutrons
   (d) mass into energy according to Einstein"s equation
Ans: (d)
331. Rays similar to X-rays but of smaller wave length that are given off by
   radioactive substances are
   (a) α -rays
   (b) β -rays
   (c) γ -rays
   (d) Cosmic rays
Ans: (c)
332. Alpha particles are
   (a) electromagnetic radiations
   (b) helium nuclei
   (c) negatively charged particles
   (d) neutral particles
Ans: (b)