Q2 of 26 Page 28

Choose one or more correct alternatives.

Power is a measure of the ...….


i. the rapidity with which work is done


ii. amount of energy required to perform the work


iii. The slowness with which work is performed


iv. length of time

Option (i) the rapidity with which work is done, Option(iii) The slowness with which work is performed

Explanation:-


Power is define as the rate of doing work or it is the work done per unit time, mathematically power is given as


P = W/t


Here, P is the power when W amount of work is done in time t. so it tells how fast or slow work is being done.


More from this chapter

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2

Choose one or more correct alternatives.

Joule is the unit of …


i. force


ii. work


iii. power


iv. energy

 2

Choose one or more correct alternatives.

Which of the forces involved in dragging a heavy object on a smooth, horizontal surface, have the same magnitude?


i. the horizontal applied force


ii. gravitational force


iii. reaction force in vertical direction


iv. force of friction

 2

Choose one or more correct alternatives.

While dragging or lifting an object, negative work is done by


i. the applied force


ii. gravitational force


iii. frictional force


iv. reaction force

 3

Rewrite the following sentences using proper alternative.

The potential energy of your body is least when you are …..


i. sitting on a chair


ii. sitting on the ground


iii. sleeping on the ground


iv. standing on the ground