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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 144 J of work by using 160 J of energy has an efficiency of

  18 J

  16 J

  10 %

  90 %

  Half-n-half Clue
 

2.

The maximum amount of work that can be done by a 90 kW machine in 12 seconds is

  8 J

  1080 J

  8 kJ

  1080 kJ

  Half-n-half Clue
 

3.

Power is the rate of doing work.

  True

  False

 

4.

_______ is the capacity to do work.

  Force

  Pressure

  Energy

  Half-n-half Clue
 

5.

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

  potential

  sound

  kinetic

  thermal

  Half-n-half Clue
 

6.

The energy losses from machines are mostly dissipated as sound energy.

  True

  False

 

7.

A body loses 1029 J of potential energy in falling through 15 m. If the gravitational acceleration is 9.8 m s-2, then the body has a mass of

  105 kg

  7 kg

  69 kg

  147 kg

  Half-n-half Clue
 


 
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