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. Which energy changes take place when a pedalling cyclist uses a generator (dynamo) to light his bicycle lamp?
2. A teacher carries a stack of books weighing a total of 30N through 2m. What is the work done by the teacher?
3. The mass of a paper-clip is 0.50 g and the density of its material is $8.0 \text{ g cm}^{-3}$. The total volume of a number of paper-clips is $20 \text{ cm}^{3}$.

How many paper-clips are there?
4. Ten identical steel balls, each of mass 27 g, are immersed in a measuring cylinder containing 20 $cm^{3}$ of water.

The reading of the water level rises to 50 $cm^{3}$.

What is the density of the steel?
5. 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?
6. A box slides down a rough incline plane. Which of the following describes how energy is being conserved?
7. In a laboratory on Earth, experiments show that an object has a mass of 2 kg and a weight of 20 N. The same experiments are then brought to the Moon, where the gravitational field strength is less than on the Earth.

Are the mass and weight of the object the same, or less, than before?
8. What can be used as the unit of energy?
9. The acceleration of free fall on the Moon is $\frac{1}{6}$ of the acceleration of free fall on the Earth. Two pieces of rock, A and B, have the same volume. A is placed on the Moon and B is placed on Earth. If both of them have the same weight, what is the ratio of A's density to B's density?
10. A block of metal is taken from the Earth to the Moon. Which property of the block changes?

 

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