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Earth - Section 1

21:  

Only one side of the moon is ever seen from the earth because

A.

the moon is at perigee

B.

the moon does not rotate

C.

only one side reflects light

D.

the periods of rotation and revolution of the moon are equal

 
 

Option: D

Explanation :

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22:  

Day's and nights are caused by
1 rotation of the earth on its axis
2. revolution of the earth around the sun
3. inclination of the earth's axis

A.

Only 1 is correct

B.

1 and 2 are correct

C.

2 and 3 are correct

D.

All are correct

 
 

Option: A

Explanation :

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23:  

What is the maximum length of  a day on the poles?

A.

12 hours

B.

24 hours

C.

3 months

D.

6 months

 
 

Option: D

Explanation :

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24:  

Which of the foliowing are true regarding equinoxes

(i) They occur on March 21st and Sept 23rd

(ii) They depict equal days and equal nights on March 21  and Sept 23  on all places of the earth

(iii) All places on the earth have equal temperature during equinoxes

A.

(i) and (iii) only

B.

(ii) and (iii) only

C.

(i) and (ii) only

D.

(i),(ii) and (iii)

 
 

Option: C

Explanation :

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25:  

Seasons on  earth are caused by 

A.

Rotation on earth around its own axis

B.

Revolution of earth round the Sun and its axis tilted at 66 1/2

C.

Shape of the earth.

D.

None of these

 
 

Option: B

Explanation :

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