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## School Physics Quiz : Work & Energy

Answer the following questions based on work & energy.

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Multiple choice

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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