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 spring is compressed, what form of energy does it possess?

Sound

Potential

Heat

Kinetic

2. 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: $E = mc^{2}$)

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

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

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

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

3. 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 man bends an iron bar

Energy has to be supplied when a chair supports a man sitting on it

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

4. 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 balance and a measuring cylinder containing water

only a measuring cylinder containing water

a ruler and a measuring cylinder containing water

5. The efficiency of an electrical generator is 65%.

What is the useful output that can be expected if the energy input to the generator is 12 kJ?

4.2 kJ

7.8 kJ

780 kJ

19 kJ

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?

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

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

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

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

7. Ali uses a 3 kW heater and a 100 W lamp together for a certain period of time. During this time, the lamp uses 0.5 kWh of energy. How much energy is used by the heater during this same period?

3 kWh

30 kWh

150 kWh

15 kWh

8. 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

Volume

Weight

Mass

9. A machine is able to lift 200 kg of bricks vertically up to a height of 30 m above the ground in 50 s. What is the power of the machine? (Take the acceleration due to gravity, $g$, to be $10 \text{ ms}^{-2}$.)

0.12 kW

1.2 kW

300 kW

6.0 kW

10. 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?

75 %

25 %

15 %

45%

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