Chapter 9: Class 9 Physics Exam Tests
Class 9 Physics MCQs - Chapter 9
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MCQ 71: A system which gives an output equal to the total energy used by it is called
MCQ 72: The main source of heat is
MCQ 73: Kinetic energy with mass ‘m’ and velocity ‘v’ is
MCQ 74: 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
MCQ 75: The SI unit of power is
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