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

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RRB JE ME CBT 2 Previous Paper 2: Held on 31 Aug 2019
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  1. Unreliable supply 
  2. High waste disposal cost
  3. Highly polluting
  4. High running cost

Answer (Detailed Solution Below)

Option 1 : Unreliable supply 
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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.
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