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School Physics Quiz : Work & Energy


Answer the following questions based on work & energy.

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Multiple choice

Your Performance  

1.

The energy acquired by a body because of its motion is called potential energy.

  True

  False

 

2.

The maximum amount of work that can be done by a 80 kW machine in 11 seconds is

  7 J

  880 J

  7 kJ

  880 kJ

  Half-n-half Clue
 

3.

If an engine does 656 J of work in 8 seconds, its average power is

  5248 W

  82 W

  648 W

  664 W

  Half-n-half Clue
 

4.

Efficiency of a machine equals

  Work Input / Work Output × 100 %

  Work Output / (Work Input + Work Output) × 100 %

  Work Input / (Work Input + Work Output) × 100 %

  Work Output / Work Input × 100 %

  Half-n-half Clue
 

5.

A boy throws a ball vertically upwards from ground level. If the ball reaches a maximum height of 90 m and the gravitational acceleration is 9.8 m/s2, with what speed did the boy throw the ball?

  42 m/s

  30 m/s

  6 m/s

  21 m/s

  Half-n-half Clue
 

6.

A pebble is dropped from the top of a cliff 48 m in height. The kinetic energy of the pebble equals twice its potential energy at a distance of _______ above sea level.

  24 m

  16 m

  12 m

  36 m

  Half-n-half Clue
 

7.

The SI unit of power is

  Joule

  Watt

  Volt

  Half-n-half Clue
 


 
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