1. A blackhole is a : [CDS 1999, 2001]

2. Stars which appear single to the naked eye but are double stars when observed by a

3. The distance between the Earth and the Sun (in million kms.) is :

4. To a space traveller on moon, the lunar sky during day time appears:

5. Which planet is known as the ‘Watery Planet’ ?

6. The orbits of planets around the Sun, or of satellites around the Earth, can be :

7. Which of the following planets is known as ‘Morning Star’?

8. Which planet of the solar system spins on its axis at the fastest rate?

9. In order of their distances from the Sun, which of the following planets lie between

10. Which of the following is the largest of the inner planets? [IAS 1990]

11. Pole Star is always seen at one point in the sky whereas other stars are not; this is

12. The brightest star in the sky is:

13. Which planet looks reddish in the night sky?

14. Halley’s comet appears once in a period of:

15. Which one of the following is correct? Great Bear is a : [CDS 2008]

16. Asteroids have their orbits between the planets:

17. In 1610, Galileo Galilei discovered four moons of which planet?

18. The outermost layer of Sun is called:

19. The correct sequence of planets in the descending order of their equatorial diameter is :

20. What are Sun spots? [Railways 1994]