A. Choose the correct option(s) in each of the following:
1. Change of seasons is due to:
a) Rotation of the earth
b) Earth's gravitational zone
c) Revolution of the earth
d) Spherical shape of the earth

2. The direct rays of the Sun fall on the equator on:
a) September 23
b) March 21
c) June 21
d) Both (a) and (b)

3. The longest day in the Southern Hemisphere is on:
a) June 21
b) March 21
c) December 22
d) September 23

4. Christmas is celebrated in summers in
a) UK
b) USA
c) Australia
d) China​