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17.	Which of the following does not belong to solar system?
	A.  Comets
	B.  Nebulae
	C.  Asteroids
	D.  Planets

Answer

Ans: B Nebulae

18.	The colour of the star is an indication of its
	A.  Temperature
	B.  Luminosity
	C.  Distance from the sun
	D.  Distance from the earth

Answer

Ans: A Temperature

19.	The planet which is called twin sister of the Earth
	A.  Mercury
	B.  Venus
	C.  Mars
	D.  Uranus

Answer

Ans: B Venus

20.	Which of the following planets is the closest to the sun?
	A.  Venus
	B.  Mars
	C.  Earth
	D.  Mercury

Answer

Ans: D Mercury