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21.	Potassium nitrate is used in
	A.  Glass
	B.  Fertilizer
	C.  Salt
	D.  Medicine

Answer

Ans: D Medicine

22.	How many teeth are known as milk teeth in human beings?
	A.  4
	B.  8
	C.  12
	D.  20

Answer

Ans: D 20

23.	The organ in the body which accumulates iodine is
	A.  Spleen
	B.  Thymus
	C.  Thyroid gland
	D.  Pituitary gland

Answer

Ans: C Thyroid gland

24.	The type of glass is used in making lenses and prism is
	A.  Soft glass
	B.  Pyrex glass
	C.  Jena glass
	D.  Flint glass

Answer

Ans: D Flint glass