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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.

If an engine does 960 J of work in 10 seconds, its average power is

  96 W

  950 W

  9600 W

  970 W

  Half-n-half Clue
 

2.

A body loses 7938 J of potential energy in falling through 90 m. If the gravitational acceleration is 9.8 m s-2, then the body has a mass of

  9 kg

  810 kg

  88 kg

  882 kg

  Half-n-half Clue
 

3.

Efficiency of a machine equals

  Work Input / Work Output × 100 %

  Work Output / (Work Input + Work Output) × 100 %

  Work Input / (Work Input + Work Output) × 100 %

  Work Output / Work Input × 100 %

  Half-n-half Clue
 

4.

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

  True

  False

 

5.

The maximum amount of work that can be done by a 30 kW machine in 8 seconds is

  4 J

  240 J

  4 kJ

  240 kJ

  Half-n-half Clue
 

6.

Both work and heat are measured in Joules.

  True

  False

 

7.

A machine that produces 104 J of work by using 160 J of energy has an efficiency of

  35 %

  56 J

  65 %

  13 J

  Half-n-half Clue
 


 
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