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Topic 4 Practice Paper: Energy, work and power — question paper

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QQ/IGCSE-PHYS/T4

IGCSE · Cambridge IGCSE Physics (Extended (Core + Supplement))

Topic 4 Practice Paper

Energy, work and power

Duration: 40 minutes
Total: 30 marks
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READ THESE INSTRUCTIONS FIRST

  • Answer all questions.
  • Section A contains ten multiple-choice questions. Choose one answer, A, B, C or D, for each.
  • Section B contains structured questions. Write your answers in the spaces provided.
  • The number of marks is given in brackets [ ] at the end of each question or part question.
  • The total mark for this paper is 30.

Original practice material written against the Cambridge IGCSE Physics syllabus. It is not an official Cambridge examination paper. Topic 4: Energy, work and power (stores, transfers, work, resources, efficiency, power).

For Examiner’s Use
Section A/ 10
Section B/ 20
Total/ 30

Section A: Multiple-choice questions[10 marks]

Choose one answer for each question. Each question is worth 1 mark.

  1. 1

    Which row names a store and a correct matching example?

    StoreExample
    Anucleara stretched catapult band
    Belectrostatica charged thundercloud
    Celastic (strain)a uranium fuel rod
    Dchemicalwater behind a dam
    1. 2

      A ball of mass 0.20 kg moves at 30 m/s. Its kinetic energy is

      1. A90 J
      2. B3.0 J
      3. C6.0 J
      4. D180 J
      ( )
    2. 3

      A 3.0 kg lamp is raised through 2.0 m. Taking g = 9.8 N/kg, the gain in gravitational potential energy is

      1. A6.0 J
      2. B29 J
      3. C59 J
      4. D5.9 J
      ( )
    3. 4

      A sledge is pulled 12 m by a rope with a force of 40 N along the direction of motion. The work done is

      1. A3.3 J
      2. B0.33 J
      3. C52 J
      4. D480 J
      ( )
    4. 5

      In a thermal power station, the steam’s role is to

      1. Aconvert thermal energy directly into electrical energy
      2. Bcool the fuel rods
      3. Cturn the turbine that drives the generator
      4. Dstore the electricity overnight
      ( )
    5. 6

      Which statement about the energy that powers the wind is correct?

      1. AWind energy originates from the Moon’s gravity
      2. BWind energy originates from radiation from the Sun
      3. CWind energy originates from Earth’s hot interior
      4. DWind energy has no original source
      ( )
    6. 7

      A machine transfers 1200 J of input energy and wastes 900 J. Its efficiency is

      1. A133%
      2. B75%
      3. C25%
      4. D900%
      ( )
    7. 8

      An escalator lifts 20 people per minute, each of average mass 60 kg, through 5.0 m. Taking g = 9.8 N/kg, the useful power output is closest to

      1. A980 W
      2. B100 W
      3. C58 800 W
      4. D5900 W
      ( )
    8. 9

      Nuclear fusion, the process that powers the Sun, is

      1. Aheavy nuclei splitting into smaller ones
      2. Blight nuclei joining together
      3. Celectrons escaping from atoms
      4. Dchemical burning of hydrogen in oxygen
      ( )
    9. 10

      Power is defined as

      1. Aenergy transferred × time
      2. Benergy transferred ÷ efficiency
      3. Cforce × distance
      4. Dwork done ÷ time taken
      ( )

    Section B: Structured questions[20 marks]

    Answer all questions in the spaces provided.

    1. 11

      A bowling ball of mass 6.0 kg rolls at 4.0 m/s along a level lane. Air resistance and friction are small but not zero.

      1. (a)

        Work out the kinetic energy stored by the rolling ball.

        [2]
      2. (b)

        The ball leaves the lane at 3.0 m/s. Calculate the kinetic energy transferred away from the ball’s motion.

        [2]
      3. (c)

        Name the store that receives the energy from part (b).

        [1]
      4. (d)

        State the principle that guarantees the 21 J still exists somewhere.

        [1]
    2. 12

      A warehouse robot drags a pallet 15 m across a level floor with a horizontal force of 220 N. The robot’s battery delivers 6000 J of electrical energy during the pull.

      1. (a)

        Calculate the work done by the 220 N force.

        [2]
      2. (b)

        Calculate the efficiency of the transfer from the battery to the pallet’s motion.

        [2]
      3. (c)

        The pull takes 30 s. Calculate the useful power delivered to the pallet.

        [2]
    3. 13

      A small island uses a mixture of diesel generators, solar cells and a tidal barrage.

      1. (a)

        State and explain which of the three resources is least reliable.

        [2]
      2. (b)

        Name the resource among the three that does not trace its energy back to radiation from the Sun, and give the reason.

        [2]
      3. (c)

        State one environmental advantage the tidal barrage has over the diesel generators.

        [1]
    4. 14

      A cable car carries tourists up a mountain. The motor is 40% efficient and raises a 500 kg car through a vertical height of 300 m in 5.0 minutes. Take g = 9.8 N/kg.

      1. (a)

        Calculate the useful energy transferred to the car.

        [1]
      2. (b)

        Calculate the total electrical energy the motor takes from the supply for this journey.

        [1]
      3. (c)

        Calculate the average input power in kW.

        [1]

    — End of paper —