Chemical Engineering - Chemical Engineering Basics

41. 

Plants produce carbohydrates from the CO2 present in the atmosphere by

A. polymerisation.
B. photochemical reaction.
C. oxidation.
D. none of these.

Answer: Option B

Explanation:

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42. 

Identify the correct statement with reference to the extractive metallurgy of aluminium.

A. The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3.
B. Approximately 80% of the aluminium deposited on the cathode comes from cryolite.
C. Sodium is deposited along with aluminium, but is immediately vaporised.
D. Anode effect sets in when the cryolite concentration goes below 40%.

Answer: Option A

Explanation:

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43. 

A particle is settling in a liquid under Stokesian conditions. The free falling velocity of the particle is proportional to

A. particle diameter
B. particle diameter
C. (particle diameter)2
D. (particle diameter)3

Answer: Option B

Explanation:

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44. 

Which of the following is not used as an alloying element in steel used for making permanent magnetic material ?

A. Tungsten
B. Chromium
C. Vanadium
D. Cobalt

Answer: Option C

Explanation:

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45. 

Pick out the wrong statement.

A. Geothermal energy is a non-conventional source of energy.
B. Mass is converted into energy in both nuclear fission & fusion reaction.
C. Inhalation of mercury vapour is not harmful for human beings.
D. Inhalation of arsenic causes cancer.

Answer: Option C

Explanation:

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