1. Cusec is a unit of:

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

3. The deepest place on earth is:

4. The temperature of the dead body is:

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

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

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

8. Light year is a unit of:

9. 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:

10. German Silver is an alloy of:

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

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

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

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

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

16. The Continent Antarctica lies at the:

17. Parsec is a unit of:

18. 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?

19. 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:

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: