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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 maximum amount of work that can be done by a 40 kW machine in 7 seconds is

  6 J

  280 J

  6 kJ

  280 kJ

  Half-n-half Clue
 

2.

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

  True

  False

 

3.

A mass of 7 kg is raised through a vertical distance of 90 m. If the gravitational acceleration is 9.8 m s-2, then the potential energy gained by the mass is

  6174 J

  630 J

  68.6 J

  882 J

  Half-n-half Clue
 

4.

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

  nuclear

  mechanical

  chemical

  Half-n-half Clue
 

5.

A machine that produces 119 J of work by using 140 J of energy has an efficiency of

  85 %

  17 J

  21 J

  15 %

  Half-n-half Clue
 

6.

_______ is the capacity to do work.

  Pressure

  Force

  Energy

  Half-n-half Clue
 

7.

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.

  54 m

  18 m

  24 m

  36 m

  Half-n-half Clue
 


 
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