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31.   During winter in cold countries, the __________ is mixed to melt the ice on the icy roads.

A.     Salt

B.    Chlorine

C.    Carbon dioxide

D.    Water

32.   In a very low temperature which from the following will freeze at last?

A.     River water

B.    Canal water

C.    Sea water

D.    Water in a lake

33.   The nearest planet to the Earth is _________.

A.     Venus

B.    Mercury

C.    Mars

D.    Moon

34.   The planet that moves round the Sun at the highest speed is?

A.     Jupiter

B.    Venus

C.    Mars

D.    Mercury

35.   In general, Comets have __________ orbits.

A.     Elliptical

B.    Highly elliptical

C.    Circular

D.    Parabolic

36.   GPS is an abbreviation for?

A.     Global Poles System

B.    Global PolySiliconium Store

C.    Global Positioning System

D.    Global Position Structure

37.   Oxidation is a chemical reaction involving the __________.

A.     Gain of Electrons

B.    Loss of Electrons

C.    Gain of Protons

D.    Loss of Protons

38.   At night, Plants intake __________ and release __________.

A.     Oxygen – Carbon dioxide

B.    Carbon dioxide – Oxygen

C.    Oxygen – Carbon monoxide

D.    Carbon monoxide – Oxygen

39.   Urine is produced in __________.

A.     Kidneys

B.    Lungs

C.    Large intestine

D.    Liver

40.   Blood is cleaned by __________.

A.     Lungs

B.    Liver

C.    Heart

D.    Kidneys

ANSWERS:

31.   A

32.   C

33.   A

34.   D

35.   B

36.   C

37.   B

38.   A

39.   A

40.   D