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 boy, who weighs 50 N, runs up a flight of stairs 6.5 m high in 7 seconds.

How much power does he develop?

$\frac{50}{7 \times 6.5}$ W

$\frac{6.5}{50 \times 7}$ W

$\frac{50 \times 6.5}{7}$ W

$\frac{7 \times 6.5}{50}$ W

2. 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

A

C

B

D

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

Sound

Potential

Heat

Kinetic

4. 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

30 kWh

3 kWh

15 kWh

5. 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?

25 %

75 %

15 %

45%

6. 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 on the object minus kinetic energy of the object

force acting on the object

work done X time

7. 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

8. The mass of a paper-clip is 0.50 g and the density of its material is $8.0 \text{ g cm}^{-3}$. The total volume of a number of paper-clips is $20 \text{ cm}^{3}$.

How many paper-clips are there?

240

320

160

80

9. 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

Y ; Density of a chipping is greater than a rock

X ; Density of a chipping is less than a rock

X ; There is more air in box X

10. 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?

2400 W

450 W

800 W

7200 W

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