1. A moderator is used in nuclear reactor in order to:

2. The number of spark plugs needed in a diesel engine is:

3. Where do most of Asteroids lie?

4. The term 'Blue Shift' is used to indicate:

5. Diamond is a very expensive ornament. It is composed of a single element:

6. Which of the following explains the reason why there is no total eclipse of the sun?

7. The most splendid and the most magnificent constellation on the sky is:

8. "Black holes" refer to:

9. Monsoon is caused by:

10. Eugenics is the study of:

11. Which of the following is most elastic?

12. Which of the following layers make radio transmission possible?

13. Which of the following atmospheric layers help in radio communication?

14. Television signals are converted into light signals by:

15. Sedimentary rocks are:

16. Kilowatt-hour is a unit of:

17. Fuel used in a Fast Breeder Reactor is:

18. The position of earth in its orbit, when it is at its greatest distance fromaghazetaleem.com summer is called:

19. Bronze is an alloy of: Bronze is an alloy of: Bronze is an alloy of: Bronze is an alloy of: Bronze is an alloy of:

20. Orbital period of the planet Mercury around the sun is:

21. The half life of a radioactive element is 8-days. How long it take to reduce it from 10 mg to 5 mg?