The latitude line on which the length of day and night always remains the same is

What is the imaginary line connecting the two poles that intersects the equator at right angles?

Which of the following planets is called sister of Earth?

Who is the most intense planet in the solar system?

How long does Buddha take to make a round of the Sun?

Which planet is the farthest from the sun?

The number of bio geographical zones in India are 

Which of the following is a star?