# Practice MCQs For Mass, Weight and Density, Work, Energy and Power

Show/Hide Sub-topics (Mass, Weight & Density | O Level Physics)
Show/Hide Sub-topics (Work, Energy & Power | O Level Physics)

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.

The quiz comprises of 10 questions, which are randomly selected from a large pool of questions. After completion, you can refresh the page and try the quiz again for a new set of 10 questions.

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1. When a spring is compressed, what form of energy does it possess?
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. Which of the following about energy is false?
4. A student does an experiment to estimate the density of an irregularly-shaped stone.

Which items of equipment are needed?
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?
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?
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?
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?
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 $10 \text{ ms}^{-2}$.)
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?

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