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. 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?

15 %

45%

75 %

25 %

2. 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

B

A

C

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 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 chair supports a man sitting on it

4. Ten identical steel balls, each of mass 27 g, are immersed in a measuring cylinder containing 20 $cm^{3}$ of water.

The reading of the water level rises to 50 $cm^{3}$.

What is the density of the steel?

13.5 $g/cm^{3}$

0.90 $g/cm^{3}$

8.1 $g/cm^{3}$

9.0 $g/cm^{3}$

5. 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?

100 W

50 W

1000 W

250 W

6. A box slides down a rough incline plane. Which of the following describes how energy is being conserved?

Gain in K.E. = Loss in P.E. + Work done against friction

Gain in P.E. = Loss in K.E. + Work done against friction

Loss in P.E. = Gain in K.E. + Work done against friction

Loss in K.E. = Gain in P.E. + Work done against friction

7. The diagram shows a material with dimensions 5 cm $ \times $ 4 cm $ \times $ 2 cm. It has a mass of 100g.

What is the density of the material?

5.0 $g/cm^{3}$

0.40 $g/cm^{3}$

10 $g/cm^{3}$

2.5 $g/cm^{3}$

8. When a spring is compressed, what form of energy does it possess?

Heat

Potential

Kinetic

Sound

9. 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?

1 : 1

Cannot be determined

1 : 6

6 : 1

10. A mass hangs on a string fixed at point P. It starts from position 1 and swings to the furthest position on the opposite side, position 2. It then oscillates several times with decreasing amplitude before ending at position 3.

Where does the ball have the most kinetic energy?

At position 2

At position 1

The first time at position 3

The last time at position 3

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