1. Sun is a:

2. An electric current can produce

3. The ozone layer protects the earth from rays sent by the sun:

4. The magnet always points in the same direction, if move freely i.e. towards nort and south poles, because of:

5. Which rocks are formed by the aliteration of pre-existing rocks by great heat or pressure?

6. Light from Sun travels a distance before it reaches Earth:

7. The age of the solar system is

8. unit of length equal to the average distance between the earth and sun is called

9. An eclipse of the sun occurs when

10. The most abundant natural Iron oxides are

11. When sound is reflected from floor, ceiling or a wall, it mixes with the origial sound and change its complexion, it is called as

12. The speed of sound in dry air at 20C is about

13. The most suitable thermometer for measuring the boiling point of water is:

14. Which one of the following statements is true:

15. The most abundant in sea water are

16. The time light takes from Sun to reach Earth is:

17. The unit of home electricity energy consumption is:

18. The density of water is greatest at:

19. The planet of the solar system which has maximum numbers of Moon is:

20. The of light in vacuum is about