Chemical Engineering - Chemical Engineering Basics
Exercise :: Chemical Engineering Basics - Section 26
| 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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