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

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

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

2. 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?

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

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

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

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

3. A girl of weight 500 N runs up a flight of stairs in 10 seconds. The vertical height of the stairs is 5 m.

What is the average power developed by the girl?

50 W

250 W

1000 W

100 W

4. 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?

5.0 $g/cm^{3}$

10 $g/cm^{3}$

2.5 $g/cm^{3}$

0.40 $g/cm^{3}$

5. 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

D

C

B

A

6. 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 higher at B.

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 the same at both points.

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.

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 ; There is more air in box X

X ; Density of a chipping is less than a rock

Y ; Density of a chipping is greater than a rock

Y ; There is less air in box Y

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 kinetic energy of the object

The power generated

The efficiency of the process

9. 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 heat and sound energy.

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.

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

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

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

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

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

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