GK - General Science Quiz 5

1. The half-life of a radio active element is 5 years. What fraction of the radioactive substance will remain after 20 years?

a) ½
b) ¼
c) 1/8
d) 1/16

2. Which of the following are the main constituents of pearl?

a) calcium carbonate and magnesium carbonate
b) aragonite and conchiolin
c) ammonium sulphate and sodium carbonate
d) calcium oxide and ammonium chloride

3. Cooking oil is converted into vegetable ghee through which process?

a) hydrogenation
b) oxidation
c) crystallization
d) cracking

4. Which ore exists in nature in the hydrated form of the metal?

a) haematite
b) carbonate
c) sulphide
d) bauxite

5. Which among the following is a natural polymer?

a) rubber
b) plastic
c) terylene
d) polyester

6. Hard water can be made soft by filtering it through which mineral?

a) zinc
b) zirconium
c) zeolite
d) selenium

7. What are the main constituents of biogas?

a) methane and carbon-dioxide
b) ethylene and carbon-dioxide
c) butane and carbon-dioxide
d) methane and carbon-monoxide

8. In the fireworks used during festivities the green flame is produced because of which of the following?

a) potassium
b) barium
c) sodium
d) mercury

9. What type of iron is obtained from blast furnace?

a) pig iron
b) cast iron
c) wrought iron
d) soft iron

10. Which of the following can be used both as an oxidizing agent and as a reducing agent?

a) sodium thiosulphate
b) sodium nitrate
c) sodium nitrite
d) sodium sulphide

11. Which one of the following metals reacts very rapidly with water at room temperature?

a) beryllium
b) potassium
c) magnesium
d) calcium

12. Which one of the following metals does not react even with boiling water?

a) beryllium
b) potassium
c) magnesium
d) calcium

13. In tritium, electrons, protons and neutrons are present in the ratio of

a) 1:1:0
b) 1:1:1
c) 1:1:2
d) 1:2:1

14. Quartz crystals, normally used in quartz clocks is chemically

a) sodium silicate
b) silicon dioxide
c) carbon dioxide
d) germanium dioxide

15. stainless steel is an alloy of iron and

a) nickel and chromium
b) chromium and tungsten
c) nickel, manganese and chromium
d) nickel, cobalt and manganese

Answers

1. 1/16
2. calcium carbonate and magnesium carbonate
3. hydrogenation
4. bauxite
5. rubber
6. zeolite
7. methane and carbon-dioxide
8. barium
9. cast iron
10. sodium nitrite
11. calcium
12. beryllium
13. 1:1:2
14. silicon dioxide
15. nickel, manganese and chromium