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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.

Kinetic energy of a body in motion equals the product of half its mass and the square of its _______

  velocity

  distance

  acceleration

  Half-n-half Clue
 

2.

A mass of 60 kg is moved vertically upwards through a distance of 11 m. If the gravitational acceleration is 9.8 m s-2, then the work done against gravity is

  660 J

  588 J

  6468 J

  107.8 J

  Half-n-half Clue
 

3.

A pebble is dropped from the top of a cliff 72 m in height. The kinetic energy of the pebble equals twice its potential energy at a distance of _______ above sea level.

  18 m

  54 m

  36 m

  24 m

  Half-n-half Clue
 

4.

A boy throws a ball vertically upwards from ground level. If the ball reaches a maximum height of 250 m and the gravitational acceleration is 9.8 m/s2, with what speed did the boy throw the ball?

  50 m/s

  10 m/s

  35 m/s

  70 m/s

  Half-n-half Clue
 

5.

Both work and heat are measured in Joules.

  True

  False

 

6.

A machine that produces 85 J of work by using 100 J of energy has an efficiency of

  15 %

  15 J

  85 %

  17 J

  Half-n-half Clue
 

7.

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

  mass

  force

  pressure

  Half-n-half Clue
 


 
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