Kerala PSC - Important and Expected General Science Questions - 21

1. Chalcopyrite is the most important ____ ore

2. Which of the following metal is found in free form in nature?
Silver, Gold, Copper, Tin

3. When iron rusts its weight ____

4. Metal is extracted from Sulphide ores by:

5. Scheelite is the ore of:

6. Which metal has the least resistance?

7. The impurities contained in ore is known as :

8. The most abundant gas in the atmosphere of Mars:

9. Which gas is used for welding?

10. Nitrating mixture contains Sulphuric acid and ____

11. Pitchblende is the ore of:

12. The gas used in Cigarette lighters:

13. The pH value of Blood:

14. The acid that cannot be kept in glass bottles:

15. The year of Chernobyl disaster?

16. The chemical procedure for determining the amount of dissolved oxygen needed by aerobic biological organisms in a body of water to break down organic material present in a given water sample at certain temperature over a specific time period is termed:

17. Nuclear winter will ____ earth's temperature:

18. The gas emitted by plants during day time:

19. The cheapest industrial acid:

20. The first to extract kerozene from petroleum:

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