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EOY Practice Paper: Sec 3 Physics (Whole Year) — question paper

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QQ/S3CPH/EOY

Secondary 3 · Combined Science (Physics) (G2 / G3)

EOY Practice Paper

Sec 3 Physics (Whole Year)

Duration: 90 minutes
Total: 60 marks
Name:
Class:
Register No.:
Date:

READ THESE INSTRUCTIONS FIRST

  • Answer all questions.
  • Section A: for each question, write the letter (A, B, C or D) of the correct answer.
  • Section B: answer in the spaces provided; show all necessary working.
  • The acceleration of free fall near the Earth is 10 m/s².
  • The use of a calculator is permitted.

Original practice material written for the MOE Combined Science (Physics) syllabus. It is not an official MOE or school examination paper. Chapters 1–8: measurement, kinematics, force and pressure, dynamics, moments, energy, kinetic particle model and thermal processes.

For Examiner’s Use
Section A/ 20
Section B/ 40
Total/ 60

Section A: Multiple-choice questions[20 marks]

Answer all questions. For each question, write the letter (A, B, C or D) of the correct answer.

  1. 1

    47 mm written in metres is

    1. A0.047 m
    2. B0.47 m
    3. C4.7 m
    4. D470 m
    ( )
  2. 2

    Which instrument is most suitable for measuring the internal diameter of a narrow test tube?

    1. Aa metre rule
    2. Bvernier calipers
    3. Ca measuring tape
    4. Da thermometer
    ( )
  3. 3

    A cyclist covers 300 m in 20 s. Her average speed is

    1. A6000 m/s
    2. B0.067 m/s
    3. C15 m/s
    4. D20 m/s
    ( )
  4. 4

    The area under a speed–time graph gives

    1. Aacceleration
    2. Bresultant force
    3. Caverage weight
    4. Ddistance travelled
    ( )
  5. 5

    A brick rests on wet sand. Making the brick stand on its smallest face

    1. Aincreases the pressure because the area is smaller
    2. Bdecreases the pressure
    3. Cdoes not change the pressure
    4. Dincreases the force
    ( )
  6. 6

    A car of mass 1500 kg accelerates at 2.0 m/s². The resultant force is

    1. A750 N
    2. B3000 N
    3. C1500 N
    4. D0.0013 N
    ( )
  7. 7

    Friction always acts

    1. Ain the direction of motion
    2. Bdownwards
    3. Copposing relative sliding motion
    4. Donly on rough surfaces moving fast
    ( )
  8. 8

    A uniform metre rule is pivoted at 50 cm. A 6.0 N weight hangs at the 25 cm mark. Its moment is

    1. A150 N m
    2. B0.15 N m
    3. C15 N m
    4. D1.5 N m
    ( )
  9. 9

    A seesaw balances with 300 N at 2.0 m from the pivot. A 600 N child must sit at

    1. A1.0 m
    2. B4.0 m
    3. C2.0 m
    4. D0.5 m
    ( )
  10. 10

    The kinetic energy of a 0.40 kg ball moving at 3.0 m/s is

    1. A1.2 J
    2. B1.8 J
    3. C0.60 J
    4. D3.6 J
    ( )
  11. 11

    A 2.0 kg box is lifted 6.0 m at constant speed. The energy transferred to its gravitational store is

    1. A12 J
    2. B60 J
    3. C120 J
    4. D0.33 J
    ( )
  12. 12

    A motor transfers 120 J in 8.0 s. Its power is

    1. A15 W
    2. B960 W
    3. C0.067 W
    4. D128 W
    ( )
  13. 13

    In which state of matter do particles move fastest, on average?

    1. Asolid
    2. Bliquid
    3. Cthey are equal
    4. Dgas
    ( )
  14. 14

    During melting at the melting point, the temperature stays constant because the energy supplied

    1. Araises the average kinetic energy
    2. Braises the potential energy of the particles
    3. Cis destroyed
    4. Descapes immediately
    ( )
  15. 15

    Sea breezes blow during the day because warm air above the land

    1. Asinks
    2. Bbecomes denser
    3. Cexpands, becomes less dense and rises
    4. Dloses all energy
    ( )
  16. 16

    The best emitter of infrared radiation is a surface that is

    1. Adull black
    2. Bshiny white
    3. Cpolished silver
    4. Dsmooth cream
    ( )
  17. 17

    3.0 km written in metres is

    1. A0.0030 m
    2. B30 m
    3. C300 m
    4. D3000 m
    ( )
  18. 18

    A sharp knife cuts better than a blunt one because its edge

    1. Aexerts a larger force
    2. Bapplies the same force over a smaller area, giving higher pressure
    3. Capplies a smaller force over a larger area
    4. Dreduces the food’s weight
    ( )
  19. 19

    A filament lamp transfers most of the electrical energy it takes in as

    1. Akinetic energy
    2. Bsound energy
    3. Cthermal energy
    4. Dchemical energy
    ( )
  20. 20

    Convection currents can carry thermal energy through a liquid because heated liquid

    1. Aexpands, becomes less dense and rises
    2. Bcontracts, becomes denser and sinks
    3. Cchanges into a solid
    4. Dstops moving altogether
    ( )

Section B: Structured questions[40 marks]

Answer all questions in the spaces provided. Show all necessary working. Take g = 10 m/s².

  1. 1

    A lorry travels 20 km along a motorway at a steady 25 m/s, then 10 km through a town at a steady 10 m/s.

    1. (a)

      Calculate the time taken for each stage, in seconds.

      times =s[3]
    2. (b)

      Calculate the average speed for the whole journey.

      average speed =m/s[3]
    3. (c)

      Explain why the average speed is not simply the average of 25 m/s and 10 m/s.

      [2]
  2. 2

    A spring-loaded toy fires a 0.020 kg ball vertically upwards at 6.0 m/s. Ignore air resistance.

    1. (a)

      Calculate the ball’s initial kinetic energy.

      KE =J[2]
    2. (b)

      Calculate the maximum height reached.

      height =m[3]
    3. (c)

      State the ball’s speed at the highest point, and its acceleration there.

      [2]
    4. (d)

      Name the energy transfer pathway that carries the spring’s elastic-store energy into the ball.

      [1]
  3. 3

    A solid cylinder has mass 500 g and a circular end face of area 0.0025 m². It stands upright on a table.

    1. (a)

      Calculate the cylinder’s weight.

      weight =N[2]
    2. (b)

      Calculate the pressure on the table.

      pressure =Pa[2]
    3. (c)

      The cylinder is laid on its curved side, where the contact area is 0.010 m². Calculate the new pressure.

      pressure =Pa[2]
    4. (d)

      State why the pressure changed even though the weight did not.

      [2]
  4. 4

    A non-uniform metre rule balances on a knife-edge at the 45 cm mark with no weights attached. A 2.0 N weight hung at the 25 cm mark is balanced by a weight hung at the 95 cm mark.

    1. (a)

      State what the balance point at 45 cm shows about the rule’s centre of gravity.

      [2]
    2. (b)

      Calculate the anticlockwise moment of the 2.0 N weight about the 45 cm pivot.

      moment =N m[2]
    3. (c)

      Calculate the weight that must hang at the 95 cm mark to balance the rule.

      [2]
    4. (d)

      The rule’s weight acts at the 45 cm mark. State the moment of the rule’s own weight about the pivot.

      [2]
  5. 5

    A student heats a beaker of crushed ice and records its temperature every minute. The temperature rises from −10 °C to 0 °C, stays at 0 °C for several minutes while the ice melts, then rises again.

    1. (a)

      Explain, using the kinetic particle model, why the temperature stays at 0 °C during melting.

      [3]
    2. (b)

      Describe what happens to the particles of the ice as it melts.

      [3]
    3. (c)

      After melting, the water is heated further. State and explain, using particles, what happens to its temperature.

      [2]

— End of paper —