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 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 _________ .

the same mass and more weight

the same mass and the same weight

less mass and the same weight

less mass and less weight

2. A boy, who weighs 50 N, runs up a flight of stairs 6.5 m high in 7 seconds.

How much power does he develop?

$\frac{6.5}{50 \times 7}$ W

$\frac{50 \times 6.5}{7}$ W

$\frac{50}{7 \times 6.5}$ W

$\frac{7 \times 6.5}{50}$ W

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?

100 W

250 W

1000 W

50 W

4. A car is driven along a level road. The total energy input from the petrol is 60 kJ, and the car wastes 45 kJ of energy.

What is the efficiency of the car?

45%

15 %

75 %

25 %

5. 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

Y ; Density of a chipping is greater than a rock

X ; Density of a chipping is less than a rock

Y ; There is less air in box Y

6. An object is lifted at constant speed through a distance h metres above the ground in t seconds. The potential energy gained by the object is equal to

force acting on the object

work done on the object

work done on the object minus kinetic energy of the object

work done X time

7. A block of metal is taken from the Earth to the Moon. Which property of the block changes?

weight

density

mass

volume

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

kinetic to potential and sound

potential to sound and heat

kinetic to sound and internal energy

potential to sound and internal energy

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

only a measuring cylinder containing water

a ruler and a measuring cylinder containing water

a balance and a measuring cylinder containing water

10. 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

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

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

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

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