Question:- Which of the gas is not known as green house gas? A. Methane B. Nitrous oxide C. Carbon dioxide D. Hydrogen
Answer:- Option D
Question:- Bromine is a A. black solid B. red liquid C. colourless gas D. highly inflammable gas
Answer:- Option B
Question:- The hardest substance available on earth is A. Gold B. Iron C. Diamond D. Platinum
Answer:- Option C
Question:- Tetraethyl lead is used as A. pain killer B. fire extinguisher C. mosquito repellent D. petrol additive
Answer:- Option D
Question:- Which of the following is used as a lubricant? A. Graphite B. Silica C. Iron Oxide D. Diamond
Answer:- Option A
Question:- The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is A. Argon B. Xenon C. Helium D. Krypton
Answer:- Option C
