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Q. The energy stored in a watch spring is
When a spring is compressed, it stores energy in form of elastic potential energy.
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Q. Which of the following phenomenon do bats or dolphins use to find prey, predators or obstacles -
Q. Doppler effect is independent of
Q. A parallel A.C circuit in resonance will
Q. If a copper wire is increased to double its length, its resistance will become
Q. The modulus of rigidity of a liquid is
Q. The efficiency of a transformer is usually of the order of
Q. What is the name of the device used to convert alternating current into direct current -
Q. Conversion of sound energy into electrical energy is done by
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