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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 7350 J of potential energy in falling through 75 m. If the gravitational acceleration is 9.8 m s-2, then the body has a mass of

  735 kg

  10 kg

  98 kg

  750 kg

  Half-n-half Clue
 

2.

Kinetic energy of a body in motion equals the product of half its mass and the square of its _______

  acceleration

  velocity

  distance

  Half-n-half Clue
 

3.

Efficiency of a machine equals

  Work Input / Work Output × 100 %

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

  Work Output / Work Input × 100 %

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

  Half-n-half Clue
 

4.

A carton is pulled along the ground for a distance of 3 m. If the average frictional force is 31 N, then the work done is

  279 J

  31 J

  93 J

  3 J

  Half-n-half Clue
 

5.

If an engine does 345 J of work in 5 seconds, its average power is

  340 W

  350 W

  1725 W

  69 W

  Half-n-half Clue
 

6.

A mass of 20 kg is moved vertically upwards through a distance of 8 m. If the gravitational acceleration is 9.8 m s-2, then the work done against gravity is

  1568 J

  160 J

  78.4 J

  196 J

  Half-n-half Clue
 

7.

A boy throws a ball vertically upwards from ground level. If the ball reaches a maximum height of 160 m and the gravitational acceleration is 9.8 m/s2, with what speed did the boy throw the ball?

  56 m/s

  40 m/s

  28 m/s

  8 m/s

  Half-n-half Clue
 


 
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