Class 9 Physics MCQs (Grade 9) From Textbook
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(a required form of output/total input energy)×100 is equal to
An body builder does 15 Joules of useful work from every 60 Joules of food energy which he takes. His efficiency will be
If some energy given to a system, then energy in the required form obtained is always
A system which gives an output equal to the total energy used by it is called
The ratio of required form of energy obtained from a system as output to the total energy given to it as input is called its
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