General Knowledge - General Science

Exercise :: General Science - Elements and Metals

16. 

The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is

A. Argon
B. Xenon
C. Helium
D. Krypton

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

17. 

The gases used in different types of welding would include

A. oxygen and hydrogen
B. oxygen, hydrogen, acetylene and nitrogen
C. oxygen, acetylene and argon
D. oxygen and acetylene

Answer: Option D

Explanation:

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18. 

The property of a substance to absorb moisture from the air on exposure is called

A. osmosis
B. deliquescence
C. efflorescence
D. desiccation

Answer: Option B

Explanation:

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19. 

In which of the following activities silicon carbide is used?

A. Making cement and glass
B. Disinfecting water of ponds
C. cutting very hard substances
D. Making casts for statues

Answer: Option C

Explanation:

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20. 

The average salinity of sea water is

A. 3%
B. 3.5%
C. 2.5%
D. 2%

Answer: Option B

Explanation:

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