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33.	Which one of the following received Nobel Prize twice for the same subject?
	A.  Stanley Cohen
	B.  Marie Curie
	C.  Frederic Jolit
	D.  Frederic Sanger

Answer

Ans: B Marie Curie

34.	A mirror produces magnified erect image of an object. The nature of the mirror is
	A.  Convex
	B.  Plane
	C.  Concave
	D.  Neither concave nor convex

Answer

Ans: C Concave

35.	The speed in colours in a rainbow on sky is primarily due to
	A.  Refraction of sunlight
	B.  Total internal reflection of sunlight
	C.  Dispersion of sunlight
	D.  Reflection of sunlight

Answer

Ans: D Reflection of sunlight

36.	Which one of the following causes green house effect?
	A.  Radio waves
	B.  Infrared rays
	C.  Ultra violet rays
	D.  Cosmic rays

Answer

Ans: B Infrared rays