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Mechanics - Work & Energy MCQs

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Mechanics - Work & Energy

Mechanics - Work & Energy MCQs With Answers

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CSS - PMS - CCE - PCS - General Science Mechanics - Work & Energy
What does conservation of energy state?
A. Energy can be created from nothing
B. Energy cannot be created or destroyed, only transferred or transformed in an isolated system
C. Energy equals mass only
D. Energy always disappears
Correct Answer: B
Total energy is conserved though it may change form.
CSS - PMS - CCE - PCS - General Science Mechanics - Work & Energy
What is gravitational potential energy near Earth's surface?
A. PE = Q/t
B. PE = mgh
C. PE = V/I
D. PE = 1/2 mv²
Correct Answer: B
For approximately uniform gravity, potential energy change is mgh.
CSS - PMS - CCE - PCS - General Science Mechanics - Work & Energy
What is the formula for translational kinetic energy?
A. KE = mv
B. KE = mgh
C. KE = 1/2 mv²
D. KE = F/A
Correct Answer: C
Classical kinetic energy is one-half mass times speed squared.
CSS - PMS - CCE - PCS - General Science Mechanics - Work & Energy
What is kinetic energy?
A. Energy due only to height
B. Energy due to motion
C. No form of energy
D. Energy stored only chemically
Correct Answer: B
Kinetic energy depends on mass and speed.
CSS - PMS - CCE - PCS - General Science Mechanics - Work & Energy
What is the SI unit of work and energy?
A. Watt
B. Joule
C. Newton
D. Pascal
Correct Answer: B
Work and energy are measured in joules.
CSS - PMS - CCE - PCS - General Science Mechanics - Work & Energy
What is mechanical work?
A. Temperature change only
B. Energy transferred when a force causes displacement in its direction
C. Force with no displacement always
D. Mass multiplied by time
Correct Answer: B
For constant force, W = Fd cosθ.
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