GROWTH AND NUTRITION OF BACTERIA QUESTIONS

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 & Explanation

Answer: Option C

Explanation:

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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 & Explanation

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 & Explanation

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 & Explanation

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 & Explanation

Answer: Option B

Explanation:

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