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 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?

320

80

160

240

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

newton per metre

watt second

volt per coulomb

volt ampere

3. 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 1

At position 2

The last time at position 3

The first time at position 3

4. 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

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

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

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

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

Which items of equipment are needed?

only a measuring cylinder containing water

a balance and a measuring cylinder containing water

a ruler and a measuring cylinder containing water

a balance and a ruler

6. Which of the following about energy is false?

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

Energy has to be supplied when a helicopter lifts a passenger off the ground

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

7. 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

B

D

C

8. 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 may be outside the body.

depends on the mass of the solid.

depends on the density of the solid.

is fixed and on the solid itself.

9. 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?

Density

Weight

Volume

Mass

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.

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

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

Kinetic energy is converted to heat and sound energy.

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