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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 energy losses from machines are mostly dissipated as sound energy.

  True

  False

 

2.

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

  acceleration

  distance

  velocity

  Half-n-half Clue
 

3.

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

  chemical

  mechanical

  nuclear

  Half-n-half Clue
 

4.

The maximum amount of work that can be done by a 60 kW machine in 12 seconds is

  5 J

  720 J

  5 kJ

  720 kJ

  Half-n-half Clue
 

5.

The SI unit of power is

  Volt

  Watt

  Joule

  Half-n-half Clue
 

6.

A boy throws a ball vertically upwards from ground level. If the ball reaches a maximum height of 90 m and the gravitational acceleration is 9.8 m/s2, with what speed did the boy throw the ball?

  6 m/s

  30 m/s

  42 m/s

  21 m/s

  Half-n-half Clue
 

7.

Power is the rate of doing work.

  True

  False

 


 
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