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21.

The period of one revolution of sun around the centre of galaxy is called:

A.	Cosmic year	B.	Astronomical year
C.	Light year	D.	Parsec

22.

Which of the following is concerned with the description and mapping of the main features of the universe?

A.	Cosmology	B.	Cosmography
C.	Astronomy	D.	None of these

23.

The same side of the moon always faces the earth because:

A.	Moon and earth have gravitational force	B.	Moon cannot change its position
C.	The period of rotation of the moon on its axis and period of revolution around the earth is almost the same	D.	None of these

24.

The light coming from stars gives the idea of their:

A.	Size	B.	Rotational speed
C.	Mass	D.	Density

25.

The constellation of stars appears at different positions in the sky at different times during night mainly:

A.	Because earth rotates about its axis	B.	Because earth revolves around the sun
C.	Because of optical illusion	D.	Because celestial bodies are changing their position

26.

The sunsports cause:

A.	Aurora australis and aurora borealis	B.	Magnetic storms on the surface of the sun
C.	Polar auroras	D.	All of these

27.

"Parsec" is the unit of measurement of:

A.	Density of stars	B.	Orbital velocity of giant stars
C.	Astronomical distance	D.	None of these

28.

The distance of the nearest star besides the sun from the earth is:

A.	3 light-years	B.	4 light-years
C.	5 light-years	D.	6 light-years

29.

Lunar-eclipse does not occur every month because:

A.	The sun's orbit is not always in the same plane as the moon	B.	The moon's orbit is not all the time in the same plane as the earth
C.	The moon revolves at a slower speed than the earth	D.	None of these

30.

Which of the following celestial bodies bear, 'The Sea of Tranquility' and 'The Ocean of Storms'?

A.	Mars	B.	Venus
C.	Moon	D.	Sun