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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 body loses 3430 J of potential energy in falling through 70 m. If the gravitational acceleration is 9.8 m s-2, then the body has a mass of

  49 kg

  350 kg

  5 kg

  686 kg

  Half-n-half Clue
 

2.

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

  True

  False

 

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.

  24 m

  18 m

  36 m

  54 m

  Half-n-half Clue
 

4.

'Energy can neither be created nor destroyed' is a statement of the

  Law of Conservation of Matter

  Law of Conservation of Electric Charges

  Law of Conservation of Energy

  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?

  20 m/s

  4 m/s

  28 m/s

  14 m/s

  Half-n-half Clue
 

6.

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

  chemical

  mechanical

  nuclear

  Half-n-half Clue
 

7.

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

  pressure

  force

  mass

  Half-n-half Clue
 

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