The energy stored in a watch spring is
1). kinetic energy
2). potential energy
3). heat energy
4). chemical energy
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2. Full form of CFL used in place of electric bulbs is
3. Velocity of sound in air does not change with the change of
4. In a railway track two rails rejoined end to end with a gap in between them because
5. A piece of ice is floating in water kept in a beaker. When all the ice melts the level of water will
7. The device used to change the speed of an electric fan is
8. If a copper wire Is increased to double its length Its resistance will become
10. In a diesel engine the high temperature needed to ignite the fuel is achieved by