Classical

Earth - Section 1

46:  

The exact time taken by the earth for single rotation on its own axis is

A.

24 hrs

B.

24 hrs 5 secs

C.

23 hrs 50 minutes 7.2 secs

D.

23 hrs 56 minutes 4.09 secs

 
 

Option: D

Explanation :

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47:  

Green House Effect  means

A.

pollution in houses in tropical regions

B.

trapping. of solar energy due to atmospheric oxygen

C.

trapping of solar energy due to atmospheric carbon dioxide

D.

Cultivation in green houses so as to check pollution.

 
 

Option: C

Explanation :

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48:  

It is six months long day in the northern polar region and six months long night in the southern polar region because

A.

earth is revolving around the sun

B.

earth is inclined towards its orbital plane

C.

earth is rotating

D.

None of these

 
 

Option: B

Explanation :

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49:  

At a latitude  of 450  the earth spins  on its axis at the rate of

A.

420 km/hr.

B.

745 km/hr.

C.

1120 km/hr.

D.

1542 km/hr.

 
 

Option: C

Explanation :

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50:  

Spring tides occur when

A.

the moon is nearest to the earth

B.

the moon is farthest from the earth

C.

the moon  the sun and the earth are at right angles to .the earth at the apex

D.

the moon, the sun and the earth are in  the same line.

 
 

Option: D

Explanation :

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