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Mechanics - Power MCQs

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Mechanics - Power

Mechanics - Power MCQs With Answers

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CSS - PMS - CCE - PCS - General Science Mechanics - Power
For constant force parallel to velocity, power can be written as what?
A. P = mv
B. P = Fv
C. P = v/F
D. P = F/v
Correct Answer: B
Instantaneous mechanical power is force dot velocity.
CSS - PMS - CCE - PCS - General Science Mechanics - Power
If 200 J of work is done in 10 s, what is the average power?
A. 20 W
B. 210 W
C. 2000 W
D. 2 W
Correct Answer: A
P = 200/10 = 20 W.
CSS - PMS - CCE - PCS - General Science Mechanics - Power
How many joules per second equal one watt?
A. 100
B. 1000
C. 1
D. 10
Correct Answer: C
By definition, 1 W = 1 J/s.
CSS - PMS - CCE - PCS - General Science Mechanics - Power
Which formula gives average power?
A. P = m/v
B. P = W×t
C. P = W/t
D. P = F/A
Correct Answer: C
Average power is work divided by time.
CSS - PMS - CCE - PCS - General Science Mechanics - Power
What is the SI unit of power?
A. Newton
B. Pascal
C. Watt
D. Joule
Correct Answer: C
One watt equals one joule per second.
CSS - PMS - CCE - PCS - General Science Mechanics - Power
What is power in mechanics?
A. Force multiplied by time only
B. Momentum per unit time only
C. Rate of doing work or transferring energy
D. Mass per unit volume
Correct Answer: C
Power measures how quickly work is done.
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