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 bullet strikes a fixed target and is brought to rest. The main energy changes when this happens are:

kinetic to sound and internal energy

potential to sound and heat

potential to sound and internal energy

kinetic to potential and sound

2. 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 $g/cm^{3}$

2.5 $g/cm^{3}$

5.0 $g/cm^{3}$

0.40 $g/cm^{3}$

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

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

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

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

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

4. 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

C

A

D

B

5. 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

6. 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

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

7. 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?

X ; Density of a chipping is less than a rock

X ; There is more air in box X

Y ; There is less air in box Y

Y ; Density of a chipping is greater than a rock

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

15 J

600 J

60 J

50 J

9. A student does an experiment to estimate the density of an irregularly-shaped stone.

Which items of equipment are needed?

a balance and a ruler

a ruler and a measuring cylinder containing water

only a measuring cylinder containing water

a balance and a measuring cylinder containing water

10. In an emergency, a car screeched to a stop to avoid a collision with a van that had stopped suddenly in front of it. What is the energy change involved in this process?

Kinetic energy is converted to sound energy only.

Kinetic and potential energy are covnerted to heat and sound energy.

Kinetic energy is converted to heat and sound energy.

Potential energy is converted to heat, sound and kinetic energy.

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