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21.

The speed of rotation of the earth is the highest:

A.	Along the equator	B.	At the North Pole
C.	Along the tropic of Cancer	D.	Along the Arctic circle

22.

The size of the earth was first measured by:

A.	Isaac Newton	B.	Galileo
C.	Eratosthenes	D.	Kepler

23.

Days and nights are caused by:

A.	Rotation of the earth on its axis	B.	Revolution of the earth around the sun
C.	Inclination of the earth's axis	D.	None of these

24.

The crust forms what percentage of the volume of the earth:

A.	0.50%	B.	2.50%
C.	3.00%	D.	3.50%

25.

At a latitude of 45

A.	1120 km/h	B.	500 km/h
C.	510 km/h	D.	620 km/h

26.

Green House Effect means:

A.	Pollution in houses in tropical regions	B.	Trapping of solar energy due to atmospheric carbon dioxide
C.	Cultivation in green houses so as the check pollution	D.	None of these

27.

The earth's annual circuit round the sun covers a distance of:

A.	1096 million im	B.	966 million km
C.	1036 million km	D.	None of these

28.

Insolation heats up the land masses more quickly than the water bodies because:

A.	Water needs more energy to warm	B.	Rocks are bad conductor of heat
C.	Landmasses are solid	D.	None of these

29.

The heavier silictes named Sima on Silica + magnesium are most abundant in the:

A.	Crust	B.	Core
C.	Ocean floors	D.	Mantle

30.

What is the approximate equatorial circumference of the earth?

A.	30000 km	B.	40000 km
C.	50000 km	D.	60000 km