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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 boy throws a ball vertically upwards from ground level. If the ball reaches a maximum height of 250 m and the gravitational acceleration is 9.8 m/s2, with what speed did the boy throw the ball?

  35 m/s

  70 m/s

  50 m/s

  10 m/s

  Half-n-half Clue
 

2.

The energy acquired by a body because of its motion is called potential energy.

  True

  False

 

3.

Efficiency of a machine equals

  Work Input / Work Output × 100 %

  Work Output / Work Input × 100 %

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

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

  Half-n-half Clue
 

4.

A body loses 2940 J of potential energy in falling through 50 m. If the gravitational acceleration is 9.8 m s-2, then the body has a mass of

  59 kg

  300 kg

  6 kg

  490 kg

  Half-n-half Clue
 

5.

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

  True

  False

 

6.

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

  True

  False

 

7.

If an engine does 592 J of work in 8 seconds, its average power is

  4736 W

  584 W

  74 W

  600 W

  Half-n-half Clue
 

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