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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.

A machine that produces 48 J of work by using 80 J of energy has an efficiency of

  60 %

  40 %

  32 J

  12 J

  Half-n-half Clue
 

2.

The energy possessed by a body due to its position or configuration is called _______ energy.

  potential

  kinetic

  thermal

  sound

  Half-n-half Clue
 

3.

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

  True

  False

 

4.

A mass of 2 kg is raised through a vertical distance of 30 m. If the gravitational acceleration is 9.8 m s-2, then the potential energy gained by the mass is

  60 J

  294 J

  588 J

  19.6 J

  Half-n-half Clue
 

5.

A boy throws a ball vertically upwards from ground level. If the ball reaches a maximum height of 40 m and the gravitational acceleration is 9.8 m/s2, with what speed did the boy throw the ball?

  14 m/s

  28 m/s

  4 m/s

  20 m/s

  Half-n-half Clue
 

6.

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

  force

  pressure

  mass

  Half-n-half Clue
 

7.

If there is no friction, the efficiency of a machine can be greater than 100 %.

  True

  False

 

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