Multiple choice

Which of the following statements is/are false?

(1) Power is the amount of work done in a unit of time and its unit is watt/sec. (2) A force is said to do work when it acts on a body and causes displacement. (3) Energy refers to the capacity to do work.

  1. Only (1)

  2. Only (2)

  3. Only (2) and (3)

  4. Neither of these
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A Correct answer
Explanation

Statement (1) is incorrect. Power is the amount of work done in a unit of time. Hence, its unit is Watt = J/s.  Statement (2) is correct. Work is always related to the displacement of body in the action of applied force. Statement (3) is correct. ‘Energy’ refers to the capacity to do work.

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