The potential difference available from a solar cell is independent of its area.
Answer
True. (The potential difference available from a solar cell is independent of its area. However, it is dependent on the way in which solar cells are connected.)
The machine which converts the potential energy of wind to electrical energy is called wind-turbine.
Answer
False. (When wind blows, the kinetic energy is present in it. This kinetic energy is converted into electricity. The flowing wind never has a potential energy.)
Use of energy is unavoidable in our daily life, but we must use it carefully and only in the required amount.
Answer
True. (The energy Supply for everyday use results into lot of pollution. This causes harmful effects in the surrounding environment. Therefore, energy should be used in minimal amount and with great care.)
In hydroelectric power plant, the kinetic energy in water stored in dam is converted into potential energy of water.
Answer
False. (In hydroelectric power plant, the potential energy in water stored in dam is converted into kinetic energy of water. The forceful downpour of flowing water causes this kinetic energy.)
How to dispose the nuclear waste safely is a big challenge before the scientists.
Answer
True. (Nuclear waste disposal is the greatest problem. It produces highly toxic effects in any ecosystem. Therefore, disposing such radioactive substances becomes a major challenge.)