1. The Continent Antarctica lies at the:

2. Three elements needed for the healthy growth of plants are:

3. Parsec is a unit of:

4. A time can come when we will be able to design a machine which can go on working for ever without the expenditure of energy. Is it possible?

5. When a ray of sunlight enters a dark room, its straight path become visible because of dust particles hanging in the air. It is because light is:

6. A six feet tall lady wants to see her full image in a plane mirror. The minimum length of the mirror will be:

7. The temperature of the dead body is:

8. Water is heated in a kettle. The inside water is beated by convection. A person sitting near the fire receives heat by:

9. Lactometer is a type of Hydrometer which is used to measure the specific gravity of:

10. In a fission nuclear reaction, a heavy nucleus breaks up into smaller nuclei whereas in another nuclear reaction two or more than two possibly nuclei are fused to form a heavy nucleus. This nuclear reaction is called:

11. Light year is a unit of:

12. The measurement of rainfall is made by an instrument known as:

13. Cusec is a unit of:

14. In winter an iron pipe feel colder than a wooden window. This is because wood is:

15. German Silver is an alloy of:

16. Which of the following types of food may reduce the risk of colon cancer?

17. It is possible to recognize a person in the dark by simply hearing his unique voice. It is because of the:

18. The principle used in radar is the same as that of Sonar. In radar we use radio waves; whereas in sonar we use:

19. The deepest place on earth is:

20. The echo reflected sound will be distinctly heard only at ordinary temperature distance of the reflecting surfaces from the source of sound is at least: