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. 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 : 1

6 : 1

1 : 6

2. Four students exercise in a gym.

Which student does the most work?

	Exercise Time (s)	Power Developed (W)
A	50	250
B	100	150
C	200	200
D	250	30

B

D

C

A

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

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

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

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

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

4. 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

750 W

75 W

13 W

5. Inertia is the resistance of a object to any change in its state of motion, including a change in direction. Which property is a measure of the body's inertia?

Mass

Weight

Density

Volume

6. A machine is able to lift 200 kg of bricks vertically up to a height of 30 m above the ground in 50 s. What is the power of the machine? (Take the acceleration due to gravity, $g$, to be $10 \text{ ms}^{-2}$.)

6.0 kW

0.12 kW

1.2 kW

300 kW

7. A teacher carries a stack of books weighing a total of 30N through 2m. What is the work done by the teacher?

50 J

15 J

600 J

60 J

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?

30 kWh

3 kWh

150 kWh

15 kWh

9. 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

450 W

2400 W

7200 W

10. 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?

10 $g/cm^{3}$

0.40 $g/cm^{3}$

5.0 $g/cm^{3}$

2.5 $g/cm^{3}$

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