Which of the following is a disadvantage of most of the renewable energy sources?

Question

Question

This question was previously asked in

RRB JE ME CBT 2 Previous Paper 2: Held on 31 Aug 2019

Answer 1

The correct answer is Unreliable supply.

Most renewable energy resources are clean because they do not produce any pollution.
Most renewable energies are cheap because their energy supplies do not have any cost.

Important Points

ENERGY SOURCE	ADVANTAGE	DISADVANTAGE
Wind turbines	Clean and cheap to run.	Expensive to set up and the wind does not always blow.
Tidal generators	Clean and cheap to run and produce a lot of electricity once running.	Very expensive to set up and could be hazardous to local wildlife.
Hydroelectric power stations	Clean and cheap to run.	Expensive to set up and output could be affected by drought.
Solar cells	Clean and cheap to run.	Not always sunny and output does not always outweigh the initial cost to set up.