Which of the following is the cause for the earth's seasons?
A. | Vari,ation in the amount of ene'rgy' given off .by thesun' |
B. | Its elliptical orbit and varying speed of rotation |
C. | Inclination of its' axis of rotation to the plane of,orbit, |
D. | Its greater' distance, from the Sun during winter than during Summer |
Option: C Explanation : Click on Discuss to view users comments. |
The position of the earth in its orbit, when it is at its greatest distance from the Sun causing summer in the Northern Hemisphere is:
A. | Perihelion |
B. | Aphelion |
C. | Perigee |
D. | Apogee |
Option: B Explanation : Click on Discuss to view users comments. |
The time required for moonlight to reach earth
A. | 3.6 sec |
B. | 2 sec |
C. | 1.3 sec |
D. | 1 sec |
Option: C Explanation : Click on Discuss to view users comments. |
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 : Click on Discuss to view users comments. |