Paper 1 · People, Development and Environment
For harnessing ocean thermal energy, the temperature difference between water at the surface and water at depths up to 2 km should be more than
A5°C
B10°C
C15°C
D20°C ✓ Correct
Correct answer: (D) 20°C — The temperature difference should be more than 20°C, so that is the answer.
Explanation
★The temperature difference should be more than 20°C, so that is the answer.
★Ocean thermal energy uses the difference between warm surface water and cold deep water.
★For it to work well, this difference must be large.
★The difference should be more than 20 degrees Celsius.
★The smaller differences are not enough to harness the energy.
★So the answer is 20°C.
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