Page 36 - GK-8

8 Medicinal Plantsedicinal Plantsedicinal Plants 31 K K
M M
Know About Sciencenow About Sciencenow About Science

Tick ( ) the correct answer :ü

1. Which is a product obtained from petroleum ?

a. Detergent b. Paraffin wax c. Both of them

2. What is used for bleaching clothes and hair ?

a. Hydrogen peroxide b. Hydrogen sulphide c. Nitrous oxide

3. What are widely used for communication over long distances ?

a. Infrared rays b. Radio waves c. Gamma rays

4. What is the filament inside an electric bulb made up of ?

a. Aluminium b. Platinum c. Tungsten

5. What is the method used to separate milk from cream at home and in dairies?

a. Filtration b. Centrifugation c. Crystallisation

6. Which is the most abundant element in the universe ?

a. Hydrogen b. Nitrogen c. Oxygen

7. Who discovered radioactivity ?

a. Robert Koch b. Pierre Curie c. Henri Becqueral

8. What makes a liquid drop spherical ?

a. Surface tension b. Capillary action c. Gravity

9. Which gas is used for making our water supply free from germs ?

a. Chlorine b. Argon c. Carbon dioxide

10. Who was the first scientist to claim that the earth is round and that it rotates
around its axis ?

a. Aristotle b. Aryabhatta c. Galileo

G.K. Magic-8 5 36 G.K. Magic-8 6 G.K. Magic-8