Practice MCQs For Mass, Weight and Density, Work, Energy and Power

This quiz contains practice questions for GCE ‘O’ level topics: Mass, Weight and Density, Work, Energy and Power. There are explanations for some of the questions after you submit the quiz. If you could not figure out why a particular option is the answer, feel free to drop a comment below or ask a question in ‘O’ & ‘A’ Level Discussion section of the forum. If you wish to contribute questions to this quiz, please contact us.

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1. An object that has a mass of 15 kg on the Earth is taken to the Moon.

The gravitational field strength on the Earth is $10 \text{ N kg}^{-1}$ and on the Moon is $1.6 \text{N kg}^{-1}$.

What are the mass and weight of the object on the Moon?

	Mass (kg)	Weight (N)
A	15	24
B	15	150
C	24	15
D	150	24

D

A

C

B

2. A bullet strikes a fixed target and is brought to rest. The main energy changes when this happens are:

kinetic to potential and sound

kinetic to sound and internal energy

potential to sound and heat

potential to sound and internal energy

3. Which of the following about energy is false?

Energy has to be supplied when a helicopter lifts a passenger off the ground

Energy has to be supplied when a man bends an iron bar

Energy has to be supplied when a chair supports a man sitting on it

Energy has to be supplied when a boy swings his arms during exercise

4. A car is driven along a level road. The total energy input from the petrol is 60 kJ, and the car wastes 45 kJ of energy.

What is the efficiency of the car?

45%

25 %

75 %

15 %

5. A block of metal is taken from the Earth to the Moon. Which property of the block changes?

mass

volume

density

weight

6. In an emergency, a car screeched to a stop to avoid a collision with a van that had stopped suddenly in front of it. What is the energy change involved in this process?

Potential energy is converted to heat, sound and kinetic energy.

Kinetic and potential energy are covnerted to heat and sound energy.

Kinetic energy is converted to sound energy only.

Kinetic energy is converted to heat and sound energy.

7. A student does an experiment to estimate the density of an irregularly-shaped stone.

Which items of equipment are needed?

a ruler and a measuring cylinder containing water

a balance and a ruler

a balance and a measuring cylinder containing water

only a measuring cylinder containing water

8. A girl of weight 500 N runs up a flight of stairs in 10 seconds. The vertical height of the stairs is 5 m.

What is the average power developed by the girl?

250 W

1000 W

50 W

100 W

9. In a laboratory on Earth, experiments show that an object has a mass of 2 kg and a weight of 20 N. The same experiments are then brought to the Moon, where the gravitational field strength is less than on the Earth.

Are the mass and weight of the object the same, or less, than before?

same mass, same weight

same mass, less weight

less mass, same weight

Less mass, less weight

10. A builder carrying six bricks climbs a ladder. Each brick weighs 25 N and the builder climbs a vertical distance of 4.0 m in 8.0 seconds.

What is the average power used to raise the bricks?

4800 W

75 W

13 W

750 W

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