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 is lifted at constant speed through a distance h metres above the ground in t seconds. The potential energy gained by the object is equal to

work done on the object

work done X time

force acting on the object

work done on the object minus kinetic energy of the object

2. 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?

750 W

75 W

13 W

4800 W

3. 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

4. Which of the following about energy is false?

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

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

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

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

5. Which energy changes take place when a pedalling cyclist uses a generator (dynamo) to light his bicycle lamp?

light $\rightarrow$ electrical $\rightarrow$ kinetic $\rightarrow$ chemical

electrical $\rightarrow$ chemical $\rightarrow$ kinetic $\rightarrow$ light

chemical $\rightarrow$ kinetic $\rightarrow$ electrical $\rightarrow$ light

kinetic $\rightarrow$ chemical $\rightarrow$ light $\rightarrow$ electrical

6. 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

only a measuring cylinder containing water

a balance and a measuring cylinder containing water

7. Which statement is correct about the position of the centre of gravity of a uniform solid?

The centre of gravity of a uniform solid

depends on the mass of the solid.

is fixed and may be outside the body.

is fixed and on the solid itself.

depends on the density of the solid.

8. Ali uses a 3 kW heater and a 100 W lamp together for a certain period of time. During this time, the lamp uses 0.5 kWh of energy. How much energy is used by the heater during this same period?

150 kWh

15 kWh

3 kWh

30 kWh

9. A 2 kg mass is moving at constant speed.

The kinetic energy of the mass is 400 J.

What is the speed of the mass?

$20 \text{ ms}^{-1}$

$200 \text{ ms}^{-1}$

$400 \text{ ms}^{-1}$

$0.4 \text{ ms}^{-1}$

10. The acceleration of free fall on the Moon is $\frac{1}{6}$ of the acceleration of free fall on the Earth. Two pieces of rock, A and B, have the same volume. A is placed on the Moon and B is placed on Earth. If both of them have the same weight, what is the ratio of A's density to B's density?

Cannot be determined

1 : 6

6 : 1

1 : 1

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