RRB Non Technical Model Papers 7 with solutions

(4) There are six noble gases.(i) Helium (ii) Neon (iii) argon(iv) Krypton (v) Xenon (vi) Radon
All of these gases are found in the atmosphere. They makeup around 0.96% of the atmosphere.Noble gases in atmosphere:
(i) Argon (0.93%)
(ii) Neon (0.0018%)
(iii) Helium (0.0005%)
(iv) Krypton (0.0001%)
(v) Xenon (0.0001005%).