Question

Which of the following is/ are correct?
(A) A solar panel is made by combining a large number of solar concentrators.
(B) To work properly, wind energy generators need wind speeds of at least about 15 km/h.
(C) Many sources ultimately derive their energy
(D) none

Answer 1

Hint: Here in this question, we will analyse each and every option that is given to us (A, B and C only three) and check whether these options given are correct or not. Some of the options given are even factual. After checking each of them we can be sure which of them are correct and which of them are not.

Complete answer:
Let check option (A) which states A solar panel is made by combining a large number of solar concentrators. A solar cell, or photovoltaic cell, is an electrical device that converts the energy of light directly into electricity by the photovoltaic effect and a panel is made by combining all these small cells together in a series.
Option (B) states to work properly, wind energy generators need wind speeds of at least about 15 km/h. but the actual speed is at least 1.5 km/h. Thus this option is incorrect.
Option (C) states that many sources ultimately derive their energy but this is not true as the renewable source of energy doesn’t get its energy from any renewable sources. So, this option is incorrect.

The correct option is (A).

Note:
From this we get to know that the minimum speed required for the proper working of a wind mill is 1.5 Km/h. This question is from the chapter of renewable energy; it discusses the facts revolving around it. Many options that are asked are factual thus we have to remember the facts properly in order to solve these types of questions. Relying on just understanding skills can prove our questions to be wrong.