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.

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. A box slides down a rough incline plane. Which of the following describes how energy is being conserved?
2. A bullet strikes a fixed target and is brought to rest. The main energy changes when this happens are:
3. Which energy changes take place when a pedalling cyclist uses a generator (dynamo) to light his bicycle lamp?
4. 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 $10 \text{ ms}^{-2}$.)
5. A block of metal is taken from the Earth to the Moon. Which property of the block changes?
6. 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 ($\text{N kg}^{-1}$)
7. Consider a stationary box at height x. The block is lifted by a student such that it comes to a rest at higher height y.

Consider the following discussion between two students:

Student 1: I exert an upward force on the box, which moves upward, so I do positive work on the box. The Earth exerts a downward force, so it does negative work on the box. The box begins and ends at rest, so its kinetic energy hasn't changed. That means that the net work on the box is zero, so the work on the box by my hand and the work on the box by the Earth must have the same absolute value.

Student 2: But the box has moved upward, so its potential energy has increased. That means that the net work on the block must be positive, so the work on the box by your hand must be greater than the work on the box by the Earth.

What can you say about the reasoning given by the two students?
8. Four students exercise in a gym.

Which student does the most work?
Exercise Time (s)Power Developed (W)
9. A brick of mass 0.8 kg accidentally dropped from a high scaffolding. It reaches the ground with a kinetic energy of 240 J. How high is the scaffolding? (Take 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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