GK-General Science Question and Answer
GK-General Science Question and Answer
11. The variety of coal in which the deposit contains recognisable traces of the original plant material is
- bitumen
- anthracite
- lignite
- peat
12. Tetraethyl lead is used as
- pain killer
- fire extinguisher
- mosquito repellent
- petrol additive
14. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is
- Argon
- Xenon
- Helium
- Krypton
15. The gases used in different types of welding would include
- oxygen and hydrogen
- oxygen, hydrogen, acetylene and nitrogen
- oxygen, acetylene and argon
- oxygen and acetylene
16. The property of a substance to absorb moisture from the air on exposure is called
- osmosis
- deliquescence
- efflorescence
- desiccation
17. In which of the following activities silicon carbide is used?
- Making cement and glass
- Disinfecting water of ponds
- cutting very hard substances
- Making casts for statues
19. When an iron nail gets rusted, iron oxide is formed
- without any change in the weight of the nail
- with decrease in the weight of the nail
- with increase in the weight of the nail
- without any change in colour or weight of the nail