MCQ practice · SSC Physics Board questions · Chapter 4: Work, Power and Energy
Which is the unit of power?
Think it through first, then pick an option.
- a Nm
- b W
- c Pa
- d JS
Answer and explanation
Correct answer: b W
The unit of power is the watt (W), that is one joule per second (J/s). Nm is a unit of work, Pa is a unit of pressure and J s is not a unit of power.
Why the other options are wrong
- a Nm: This is not the answer: The unit of power is the watt (W), that is one joule per second (J/s). Nm is a unit of work, Pa is a unit of pressure and J s is not a unit of power.
- c Pa: This is not the answer: The unit of power is the watt (W), that is one joule per second (J/s). Nm is a unit of work, Pa is a unit of pressure and J s is not a unit of power.
- d JS: This is not the answer: The unit of power is the watt (W), that is one joule per second (J/s). Nm is a unit of work, Pa is a unit of pressure and J s is not a unit of power.
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