The …………… revolves around the earth and the earth revolves around the sun.

B) Biological changes

B) Ultraviolet rays

B) (a) = non – uniform; (b) = uniform

A) air is colloid

B) ozone layer

B) 27.3 days

D) radius of the earth

Correct Answer - A `V_(0)=sqrt((GM)/(R+h))rArr V_(0)prop1/(sqrt(R+h))`

Rising and setting of the sun at a given place is a periodic change.

Correct option is (a) revolution