Which set of properties correctly describes hydroelectric energy?
- Naturally available, friendly, turns turbines
- Naturally available, unreliable, turns turbines
- Unreliable, friendly, turns the turbines
- Naturally available, unreliable, friendly
Show answer and solution
Correct answer: A. Naturally available, friendly, turns turbines
1. Hydroelectric energy is a renewable source, drawn from flowing water.
2. It is naturally available, since the water cycle continually replenishes it.
3. It is environmentally friendly, because generating it releases no combustion gases.
4. It works by turning turbines that drive generators.
5. It is reliable rather than unreliable, so any option including unreliability is wrong.
_Source: NECTA CSEE 2021 Physics 031, Question 1: Multiple Choice, item (vi)_