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46 . Which of the gas is not known as green house gas?
A. Carbon dioxide B. Hydrogen
C. Methane D. Nitrous oxide

47 . Washing soda is the common name for
A. Calcium bicarbonate B. Calcium bicarbonate
C. Sodium bicarbonate D. Sodium carbonate

48 . The hardest substance available on earth is
A. Diamond B. Iron
C. Gold D. Platinum

49 . Which of the following is used as a lubricant?
A. Silica B. Graphite
C. Iron Oxide D. Diamond

50 . Tetraethyl lead is used as
A. mosquito repellent
pain killer
C. fire extinguisher
D. petrol additive