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 man weighs 600 N. He runs up stars of total height 4 metres in 3 seconds. How much power is exerted by the man?

800 W

2400 W

7200 W

450 W

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

The centre of gravity of a uniform solid

is fixed and on the solid itself.

is fixed and may be outside the body.

depends on the density of the solid.

depends on the mass of the solid.

3. Four objects (A, B, C, D) are situated in places with different gravitational field strengths.

Which object has the greatest weight?

	Mass (kg)	Gravitational Field Strength ($\text{N kg}^{-1}$)
A	3.0	10.4
B	3.5	9.5
C	4.0	10.2
D	4.5	9.0

D

B

C

A

4. A box X full of large granite rocks is weighed. An identical box Y full of small granite chippings is then weighed.

Which box weighs more and why?

Y ; There is less air in box Y

X ; Density of a chipping is less than a rock

Y ; Density of a chipping is greater than a rock

X ; There is more air in box X

5. 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?

0.90 $g/cm^{3}$

13.5 $g/cm^{3}$

8.1 $g/cm^{3}$

9.0 $g/cm^{3}$

6. 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 chair supports a man sitting on it

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

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

7. What can be used as the unit of energy?

volt per coulomb

newton per metre

watt second

volt ampere

8. 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?

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

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

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

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

9. 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?

75 W

4800 W

750 W

13 W

10. A rock on the Moon has a mass of 0.5 kg. It is brought to the Earth where the gravitational field is stronger. On the Earth, the rock will have _________ .

the same mass and more weight

the same mass and the same weight

less mass and less weight

less mass and the same weight

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