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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.

If an engine does 756 J of work in 9 seconds, its average power is

  747 W

  765 W

  6804 W

  84 W

  Half-n-half Clue
 

2.

A pebble is dropped from the top of a cliff 84 m in height. The kinetic energy of the pebble equals twice its potential energy at a distance of _______ above sea level.

  21 m

  28 m

  42 m

  63 m

  Half-n-half Clue
 

3.

A machine that produces 128 J of work by using 160 J of energy has an efficiency of

  80 %

  32 J

  16 J

  20 %

  Half-n-half Clue
 

4.

Both work and heat are measured in Joules.

  True

  False

 

5.

A body loses 3430 J of potential energy in falling through 70 m. If the gravitational acceleration is 9.8 m s-2, then the body has a mass of

  350 kg

  49 kg

  5 kg

  686 kg

  Half-n-half Clue
 

6.

The maximum amount of work that can be done by a 50 kW machine in 12 seconds is

  4 J

  600 J

  4 kJ

  600 kJ

  Half-n-half Clue
 

7.

Power is the rate of doing work.

  True

  False

 


 
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