GK General Science 1

1. Which of the following is the most reactive among halogens?

a) fluorine
b) chlorine
c) bromine
d) iodine

2. Which one of the following was used as a chemical weapon in the First World War?

a) carbon monoxide
b) hydrogen cyanide
c) mustard gas
d) water gas

3. Which one of the following has the highest fuel value?

hydrogen
b) charcoal
c) natural gas
d) gasoline

4. Which one of the following is used as an anti-freeze for the automobile engines?

a) propyl alcohol
b) ethanol
c) methanol
d) ethylene glycol

5. Which one of the following gases is used for the purification of water?

a) oxygen
b) ammonia
c) chlorine
d) carbon dioxide

6. What is the chemical name of baking soda?

a) sodium bicarbonate
b) sodium nitrate
c) sodim carbonate
d) potassium nitrate

7. Which one of the following is present in common toothpastes as an abrasive?

a) calcium oxide
b) calcium carbonate
c) calcium fluoride
d) calcium chloride

8. Which one of the following chemicals is a food preservative?

a) sodium carbonate
b) sodium bicarbonate
c) sodium benzoate
d) sodium thiosulphate

9. Which one of the following is present in gobar gas?

a) carbon dioxide
b) ethane
c) methane
d) hydrogen

10. Which are the two of the most common elements in the earth’s crust?

a) nitrogen and oxygen
b) nitrogen and silicon
c) carbon and oxygen
d) silicon and oxygen

11. Which one of the following is a greenhouse gas?

a) oxygen
b) hydrogen
c) carbon dioxide
d) nitrogen

12. Fire extinguishers release which of the following gas?

a) hydrogen
b) nitrogen
c) carbon dioxide
d) carbon monoxide

13. Which one of the following gases present in the upper atmosphere protects the earth from harmful ultraviolet radiations?

a) carbon dioxide
b) ozone
c) nitrogen
d) oxygen

14. Which one of the following is the main culprit in the thinning of ozone layer in the earth’s upper atmosphere?

a) carbon dioxide
b) chloroflurocarbons
c) nitrogen
d) oxygen

15. Which one of the following is present in the emission from ‘unleaded petrol’?

a) carbon monoxide
b) carbon dioxide
c) hydrocarbons
d) ethylene

Answers

fluorine
2. mustard gas
3. hydrogen
4. ethanol
5. chlorine
6. sodium bicarbonate
7. calcium fluoride
8. sodium benzoate
9. methane
10. silicon and oxygen
11. carbon dioxide
12. carbon dioxide
13. ozone
14. chloroflurocarbons
15. hydrocarbons