Class 9 Physics MCQs - Chapter 9

Work and Energy Quiz Questions and Answers PDF - 15

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Work and Energy Questions & Answers PDF Download: MCQ Quiz 15

MCQ 71: A system which gives an output equal to the total energy used by it is called

negative system
non-ideal system
ideal system
slow system

MCQ 72: The main source of heat is

moon
stars
sun
Mars

MCQ 73: Kinetic energy with mass ‘m’ and velocity ‘v’ is

2 mv²
1/2 mv
2m ⁄ v²
1/2 mv²

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

efficiency
power
stress
strain

MCQ 75: The SI unit of power is

joules
newton
watt
omega

Class 9 Physics Mock Tests

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