Class 9 Online Courses

Chapter 9: Class 9 Physics Exam Tests

Class 9 Physics MCQs - Chapter 9

# Work and Energy Quiz Questions and Answers PDF - 15

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## Work and Energy Quiz Questions : Physics Test 15

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

A) negative system
B) non-ideal system
C) ideal system
D) slow system

MCQ 72: The main source of heat is

A) moon
B) stars
C) sun
D) Mars

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

A) 2 mv²
B) 1/2 mv
C) 2m ⁄ v²
D) 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

A) efficiency
B) power
C) stress
D) strain

MCQ 75: The SI unit of power is

A) joules
B) newton
C) watt
D) omega

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