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

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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. In an emergency, a car screeched to a stop to avoid a collision with a van that had stopped suddenly in front of it. What is the energy change involved in this process?
2. 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
3. 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 _________ .
4. A pendulum is released from rest and undergoes simple harmonic motion (its oscillating). The starting point of the pendulum is point A and the lowest point of the oscillation is point B. By comparing the pendulum's state at the point A and point B of the oscillation, what can you say about the
  1. total energy of the Earth-pendulum system and
  2. the total energy of the system consisting of the pendulum only

(Neglect air resistance)
5. 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?
6. Which of the following about energy is false?
7. A builder carrying six bricks climbs a ladder. Each brick weighs 25 N and the builder climbs a vertical distance of 4.0 m in 8.0 seconds.

What is the average power used to raise the bricks?
8. What can be used as the unit of energy?
9. An object that has a mass of 15 kg on the Earth is taken to the Moon.

The gravitational field strength on the Earth is $10 \text{ N kg}^{-1}$ and on the Moon is $1.6 \text{N kg}^{-1}$.

What are the mass and weight of the object on the Moon?
Mass (kg)Weight (N)
10. A crane lifts a load of 6000 N through a vertical distance of 15 m in 30 s.

What is the average useful power during this operation?


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21 thoughts on “Practice MCQs For Mass, Weight and Density, Work, Energy and Power”

  1. 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?
    1. They are both incorrect.
    2. Student 2 is correct and student 1 is incorrect.
    3. They are both correct.
    4. Student 1 is correct and student 2 is incorrect.

    why is the answer 4

    • student 2 is incorrect as they say that the work done on the box by the hand must be greater than the work done on the box by gravity, which, if it was true, would mean that the box is accelerating. Student 1 however says that the work done on the box must be zero, and have the same value.

      idk just guessing

  2. volume of ten steel balls =50-20=30
    volume of a steel ball=30/10=3 cm^3
    mass of a steel ball=27 g

  3. I also have a question.
    Which of these have a greater refractive index and why?
    A) water

    1)water, since it has more density
    2) ice, since it has more density
    3) water, since it has less density
    4) ice, since it has less density

  4. 1. Ten identical steel balls, each of mass 27 g, are immersed in a measuring cylinder containing 20 cm3cm3 of water.
    The reading of the water level rises to 50 cm3 .

    What is the density of the steel?

    a)8.1 g/cm3
    b)13.5 g/cm3
    c)9.0 g/cm3[correct]
    d)0.90 g/cm3
    The volume of the ten steel balls is 50 – 20 = 30 . Density is calculated using Density= mass/volume.

    Can someone explain to me why c is correct?
    But I think d is correct.

  5. There is a problem with these tests….. I tick the correct answers but when they show the result, all the answers that I ticked are shown wrong. I mean, they do not check correctly what I ticked. e.g if I ticked the answer c, which is correct, then instead of giving me marks, they think I ticked something else for example d and them tell me the correct answer is c which I eventually did tick.!!!! I AM CONFUSED!


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