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Q.

A wrist watch works on the basis of energy possessed by


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a

A pendulum

b

A spring

c

A battery only

d

Can be a spring or a battery 

answer is D.

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Detailed Solution

The wristwatch works on the basis of energy possessed by a spring or a battery.
The wristwatches mostly contain a battery that provides power to operate. The electrical energy of the battery is converted into mechanical energy that turns the watch. In addition, some wristwatches have a spring that stores energy for the working of the watch.
 
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A wrist watch works on the basis of energy possessed by