Classical

Earth - Section 1

31:  

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

A.

0.5%

B.

2.5%

C.

7.5%

D.

12.5%

 
 

Option: A

Explanation :


32:  

Variation in duration of day and night is due to
1. rotation of earth on its axis
2. revolution of earth round the sun
3. inclination of earth atan angle of 66 1/2

A.

1 and 2

B.

2 and   3

C.

1 and 3

D.

1,2 and 3

 
 

Option: B

Explanation :


33:  

The moon is called a satellite of the earth because

A.

it is much 'smaller than the earth

B.

it revolves round the earth

C.

it draws light froth the sun via the earth

D.

it remains in position due to the gravitational pull of the earth.

 
 

Option: B

Explanation :


34:  

The earth rotates around its axis from

A.

north to south

B.

east to west

C.

south to north

D.

west to east

 
 

Option: D

Explanation :


35:  

The inclination of the earth's axis to the orbital plane is

A.

21 1
      2

B.

23 1
      2

C.

66 1
      2

D.

90o

 
 

Option: C

Explanation :




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