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13.	The setting of plaster of paris takes place due to
	A.  Hydration
	B.  Oxidation
	C.  Dehydration
	D.  Reduction

Answer

Ans: A Hydration

14.	Name the metal, which is in the liquid state
	A.  Mercury
	B.  Sodium
	C.  Chromium
	D.  Vanadium

Answer

Ans: A Mercury

15.	Manganese steel is used in making
	A.  Electromagnets
	B.  Razor blades
	C.  Surgical instrument
	D.  Burglar proof safety lockers

Answer

Ans: D Burglar proof safety lockers

16.	The colour imparted by cobalt us oxide in
	A.  Green
	B.  Blue
	C.  Brown
	D.  Yellow

Answer

Ans: B Blue