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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 losses from machines are mostly dissipated as sound energy.

  True

  False

 

2.

A machine that produces 60 J of work by using 80 J of energy has an efficiency of

  75 %

  20 J

  25 %

  15 J

  Half-n-half Clue
 

3.

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

  distance

  velocity

  acceleration

  Half-n-half Clue
 

4.

The maximum amount of work that can be done by a 60 kW machine in 10 seconds is

  6 J

  600 J

  6 kJ

  600 kJ

  Half-n-half Clue
 

5.

A mass of 4 kg is raised through a vertical distance of 100 m. If the gravitational acceleration is 9.8 m s-2, then the potential energy gained by the mass is

  3920 J

  39.2 J

  980 J

  400 J

  Half-n-half Clue
 

6.

Both work and heat are measured in Joules.

  True

  False

 

7.

A body loses 7840 J of potential energy in falling through 100 m. If the gravitational acceleration is 9.8 m s-2, then the body has a mass of

  78 kg

  980 kg

  800 kg

  8 kg

  Half-n-half Clue
 


 
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