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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.

When a current is supplied by a battery, _______ energy is converted to electrical energy.

  nuclear

  mechanical

  chemical

  Half-n-half Clue
 

2.

Power is the rate of doing work.

  True

  False

 

3.

A body loses 1568 J of potential energy in falling through 80 m. If the gravitational acceleration is 9.8 m s-2, then the body has a mass of

  784 kg

  2 kg

  20 kg

  160 kg

  Half-n-half Clue
 

4.

A boy throws a ball vertically upwards from ground level. If the ball reaches a maximum height of 160 m and the gravitational acceleration is 9.8 m/s2, with what speed did the boy throw the ball?

  40 m/s

  28 m/s

  56 m/s

  8 m/s

  Half-n-half Clue
 

5.

Efficiency of a machine equals

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

  Work Input / Work Output × 100 %

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

  Work Output / Work Input × 100 %

  Half-n-half Clue
 

6.

By definition, work is done when a _______ moves through a distance.

  pressure

  mass

  force

  Half-n-half Clue
 

7.

A pebble is dropped from the top of a cliff 96 m in height. The kinetic energy of the pebble equals twice its potential energy at a distance of _______ above sea level.

  48 m

  72 m

  32 m

  24 m

  Half-n-half Clue
 


 
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