Question

Which of the following does not contain chemical energy?
(a) Battery
(b) Candle
(c) Coal
(d) Stretched rubber band​

Answer 1

A stretched rubber band doesn't contain chemical energy.

Detailed Discussion:

• Battery , coal and candle all operate on the principle of chemical energy.

• Battery operates due to chemical energy between the components of the battery. Candle produces energy due to combustion of wax. Coal has energy of carbon.

• However, the energy stored in the rubber band is essentially due to the work done by the operator in order to stretch the rubber band.

• The work done by the the operator gets stored in the rubber band as the potential energy.

• Consider the rubber band to be a SPRING, as the operator pulls the rubber band, he/she does work and the work gets stored in the form of Potential Energy as spring energy is a conservative force.

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