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Question

Which one of the following does not convert electrical energy into light energy?

This question was previously asked in
CDS I 2018 Elementary Mathematics Previous Year Paper (04-Feb-2018)
The correct answer is

A candle

  • The burning of a candle is a chemical change in which chemical energy is converted into light and heat energy.
  • All other options use electrical energy and convert it into light energy. Therefore, Option 1 is the correct choice.

Some examples of energy conversion:

Microphone A device that converts sound waves into forms of electrical energy. 
 LoudspeakerA device that converts electrical signals into a sound that is loud enough to be heard at a distance. 
Solar CellA device that directly converts light energy into electricity through the photovoltaic effect. 
GramophoneA device used for recording sound and playing it back. 
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Important Questions from Work Power Energy

  1. Which of the following is NOT correct regarding friction?

  2. If a pump can raise 200 liters of water through a height of 300 meters in one minute, how much work can it do in one hour?

  3. Which of the following is an example of kinetic energy?

  4. How much kinetic energy does a 160 g cricket ball have when it is thrown at a speed of 22 m/s?

  5. The movement of birds is an example of _______.

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