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. 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?
2. 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?
3. When a spring is compressed, what form of energy does it possess?
4. Which of the following about energy is false?
5. A girl of weight 500 N runs up a flight of stairs in 10 seconds. The vertical height of the stairs is 5 m.

What is the average power developed by the girl?
6. 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?
7. A teacher carries a stack of books weighing a total of 30N through 2m. What is the work done by the teacher?
8. A box X full of large granite rocks is weighed. An identical box Y full of small granite chippings is then weighed.

Which box weighs more and why?
9. 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?
10. 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)

 

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20 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

    Reply
    • 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

      Reply
  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
    density=mass/volume=27g/3cm^3=9g/cm^3

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

    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

    Reply
  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.

    Reply
  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!

    Reply

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