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. When a nucleus of Uranium-235 absorbs a neutron, nuclear fission occurs. In a typical reaction, the total mass decreases by $3 \times 10^{-28}$ kg.

Given that the speed of light c is $3 \times 10^{8}$ m/s, approximately how much energy is released?

 

Hint: (Use Einstein's mass equivalence equation: $E = mc^{2}$)

$3 \times 10^{-11}$ J

$3 \times 10^{-5}$ J

$2 \times 10^{-13}$ J

$9 \times 10^{-20}$ J

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

C

A

D

B

3. 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?

750 W

4800 W

75 W

13 W

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

Potential

Kinetic

Heat

Sound

5. 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

6. A javelin has a mass of 0.80 kg.

The javelin is released with 250 J of kinetic energy.

What is the speed of the javelin?

$13 \text{m s}^{-1}$

$63 \text{m s}^{-1}$

$18 \text{m s}^{-1}$

$25 \text{m s}^{-1}$

7. 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.

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

Kinetic energy is converted to heat and sound energy.

8. A student uses a newton meter to pull an object horizontally along rough ground. The student multiplies the newton meter reading by the distance moved by the object.

What does this calculation give?

The work done on the object

The power generated

The kinetic energy of the object

The efficiency of the process

9. 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 _________ .

less mass and less weight

the same mass and the same weight

less mass and the same weight

the same mass and more weight

10. A pendulum is released from rest and undergoes simple harmonic motion (its oscillating). The starting point of the pendulum is point A and the lowest point of the oscillation is point B. By comparing the pendulum's state at the point A and point B of the oscillation, what can you say about the

1. total energy of the Earth-pendulum system and
2. the total energy of the system consisting of the pendulum only

 

(Neglect air resistance)

The total energy of the Earth-pendulum system is the same at both points. The total energy of the system consisting of the pendulum is the same at both points.

The total energy of the Earth-pendulum system is the same at both points. The total energy of the system consisting of the pendulum is higher at A.

The total energy of the Earth-pendulum system is the same at both points. The total energy of the system consisting of the pendulum is higher at B.

The total energy of the Earth-pendulum system is higher at A. The total energy of the system consisting of the pendulum is the same at both points.

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