1. What is the main element found in steel?
Iron
2. The gas which cause acid rain in industrial area.
3. The gas helps to ripen fruits:
Ethylrrene
4. Which gas is essential for combustion?
Oxygen
5. Which of the following materials is the best conductor of Electricity?
Silver
6. Which of the following is the best conductor of Electricity?
Salt water
7. ……………is the purest form of carbon
Diamond
8. How much part of the iceberg is visible above the surface of water?
1\10
9. A light –sensitive compound used in photography is
Silver bromide
10. Thin leaves of which metal are used as Ayurvedic
Gold
11. Which of the following is used in rockets to burn the fuels?
Liquid Oxygen
12. The Noble Gas which is present in microscopic quantities air is………
Krypton
13. Which of the following is not an explosive?
Trinitron chlorine
14. The inert gas obtained as a component of natural hydrocarbon gas is
Helium
15. The raw material used in the manufacture of cement is………
16. Sodium is kept in ……..liquid
Kerosene
17. Mercury is a__________
Metal
18. A substance having long chains of similar molecules linked together are called…………
Polymer
19. The gas used for welding:
Acetylene
20. What metallic element is found in “fool’s gold”?
Iron
21. Which of the following gases is used in cigarette lighters?
Butane
22. The raw materials from which, rayon is manufactured
Cellulose
23. The term ‘octane number’ is related to…….
Petrol
24. Which of the following is present in hard water?
Calcium
25. Freon-12 is used ad
Refrigerant
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