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Prelim Practice Paper: Sec 4 Physics (Whole Year) — question paper

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QQ/S4CPH/PRELIM

Secondary 4 · Combined Science (Physics) (G2 / G3)

Prelim Practice Paper

Sec 4 Physics (Whole Year)

Duration: 120 minutes
Total: 80 marks
Name:
Class:
Register No.:
Date:

READ THESE INSTRUCTIONS FIRST

  • Answer all questions.
  • Section A: choose the one correct answer for each multiple-choice question.
  • Section B: answer in the spaces provided; show all necessary working.
  • Give numerical answers to 3 significant figures where appropriate, with units.
  • The acceleration of free fall near the Earth is 10 m/s².
  • The speed of sound in air is 340 m/s unless stated otherwise.
  • 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: waves, EM spectrum, light, electric charge and current, D.C. circuits, practical electricity, magnetism and electromagnetism, radioactivity.

For Examiner’s Use
Section A/ 20
Section B/ 60
Total/ 80

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

    A wave transfers

    1. Amatter only
    2. Benergy without transferring matter
    3. Cmatter and energy together
    4. Dparticles along its length
    ( )
  2. 2

    A radio wave has frequency 150 MHz. Its wavelength is

    1. A0.5 m
    2. B4.5 × 10⁸ m
    3. C2.0 m
    4. D45 m
    ( )
  3. 3

    Which EM radiation is used to sterilise sealed medical equipment?

    1. Aradio waves
    2. Bmicrowaves
    3. Cinfrared
    4. Dgamma rays
    ( )
  4. 4

    A ray exits a glass block into air. It bends

    1. Aaway from the normal
    2. Btowards the normal
    3. Calong the normal
    4. Dinto the block
    ( )
  5. 5

    An object inside the focal length of a converging lens gives an image that is

    1. Areal and diminished
    2. Bvirtual, upright and magnified
    3. Creal and inverted
    4. Dvirtual and inverted
    ( )
  6. 6

    The unit of charge is the

    1. Aampere
    2. Bvolt
    3. Ccoulomb
    4. Dohm
    ( )
  7. 7

    A current of 0.50 A flows for 2.0 minutes. The charge transferred is

    1. A1.0 C
    2. B100 C
    3. C0.0042 C
    4. D60 C
    ( )
  8. 8

    A resistor carries 0.50 A at 12 V. Its resistance is

    1. A24 Ω
    2. B6.0 Ω
    3. C0.042 Ω
    4. D12.5 Ω
    ( )
  9. 9

    In a series circuit, the current

    1. Asplits between the components
    2. Bis the same at every point
    3. Cis largest through the biggest resistor
    4. Ddecreases along the loop
    ( )
  10. 10

    Two 6.0 Ω resistors in parallel have an effective resistance of

    1. A12 Ω
    2. B6.0 Ω
    3. C3.0 Ω
    4. D0.33 Ω
    ( )
  11. 11

    A 6.0 V battery drives a total resistance of 12 Ω. The supply current is

    1. A0.50 A
    2. B2.0 A
    3. C72 A
    4. D18 A
    ( )
  12. 12

    The colour of the live wire in a mains plug is

    1. Ablue
    2. Bgreen and yellow
    3. Cblack
    4. Dbrown
    ( )
  13. 13

    A 4.0 A appliance runs on 230 V. Its power is

    1. A57.5 W
    2. B920 W
    3. C234 W
    4. D1840 W
    ( )
  14. 14

    A 0.92 kW h appliance run costs, at 30 cents per kW h,

    1. A$27.60
    2. B$0.28
    3. C$1.84
    4. D$0.55
    ( )
  15. 15

    Which material is magnetic?

    1. Acopper
    2. Baluminium
    3. Czinc
    4. Dsteel
    ( )
  16. 16

    Reversing only the current through a wire in a magnetic field makes the force on the wire

    1. Areverse direction
    2. Bdouble
    3. Cbecome zero
    4. Dstay the same
    ( )
  17. 17

    In Fleming’s left-hand rule, the thumb shows the direction of the

    1. Afield
    2. Bforce (motion)
    3. Ccurrent
    4. Dp.d.
    ( )
  18. 18

    Radiation from a source is stopped by a sheet of paper. It is

    1. Abeta
    2. Bgamma
    3. CX-ray
    4. Dalpha
    ( )
  19. 19

    The half-life of a source is 8.0 hours. After 24 hours, an initial 32 g sample has decayed to

    1. A16 g
    2. B4.0 g
    3. C8.0 g
    4. D2.0 g
    ( )
  20. 20

    Uranium-238 (²³⁸₉₂U) contains

    1. A146 neutrons
    2. B92 neutrons
    3. C238 neutrons
    4. D330 neutrons
    ( )

Section B: Structured questions[60 marks]

Answer all questions in the spaces provided. Show all necessary working. Speed of sound = 340 m/s; speed of light = 3 × 10⁸ m/s; g = 10 m/s²; mains 230 V.

  1. 1

    A ship’s sonar sends a pulse downwards; the echo from the seabed returns after 1.6 s. Sound travels at 1700 m/s in seawater. Separately, a wave of frequency 50 Hz travels 40 m in 5.0 s.

    1. (a)

      Calculate the depth of the seabed.

      depth =m[3]
    2. (b)

      Calculate the speed and the wavelength of the 50 Hz wave.

      v =m/s[3]
    3. (c)

      The 50 Hz wave travels along a long stretched spring as a series of compressions and rarefactions. State whether it is transverse or longitudinal, and describe how the spring’s coils move.

      [2]
  2. 2

    A ray of light strikes a glass block (refractive index 1.5) at an angle of incidence of 30°.

    1. (a)

      Calculate the angle of refraction.

      r =°[3]
    2. (b)

      Calculate the speed of light in the glass.

      speed =m/s[2]
    3. (c)

      State what happens to a ray shone along the normal, and name the angle of incidence then.

      [2]
  3. 3

    A 12 V battery drives a 3.0 Ω resistor in series with a parallel pair of two 6.0 Ω resistors.

    1. (a)

      Show that the total resistance of the circuit is 6.0 Ω.

      [2]
    2. (b)

      Calculate the current from the battery.

      I =A[2]
    3. (c)

      Calculate the p.d. across the parallel pair and the current through one of its resistors.

      V =V[4]
  4. 4

    A metal-cased washing machine is rated 2300 W at 230 V and is plugged in by a correctly wired three-pin plug.

    1. (a)

      Calculate the normal current of the machine.

      I =A[2]
    2. (b)

      From the ratings 3 A and 13 A, choose the correct fuse and justify the choice.

      [2]
    3. (c)

      Name the three wires and their colours, and state where the machine’s metal case connects.

      [3]
    4. (d)

      A live wire breaks and touches the case. Explain, step by step, how the safety features protect the user.

      [2]
  5. 5

    A hairdryer is rated 920 W and is used 15 minutes a day at 30 cents per kW h. Its plastic casing carries the double-insulation symbol.

    1. (a)

      Calculate the energy used in one day, in kW h.

      E =kW h[2]
    2. (b)

      Calculate the cost of using the hairdryer for 30 days.

      cost =[2]
    3. (c)

      Explain what double insulation means and why the hairdryer has no earth wire.

      [2]
    4. (d)

      State one hazard of using a mains hairdryer with wet hands, with a reason.

      [2]
  6. 6

    A solenoid is wound on an iron core and connected to a battery through a switch. A steel paperclip chain hangs from a bar magnet nearby.

    1. (a)

      Describe the solenoid’s magnetic field when the switch is closed.

      [2]
    2. (b)

      State three ways to strengthen the solenoid’s field.

      [3]
    3. (c)

      Explain why the paperclip chain hangs from the magnet and why it falls when the magnet is removed.

      [4]
  7. 7

    A source’s corrected count rate is 800 counts/min and its half-life is 2.0 hours. Uranium-238 (²³⁸₉₂U) is a long-lived isotope.

    1. (a)

      Calculate the corrected count rate after 6.0 hours.

      rate =counts/min[3]
    2. (b)

      State what "corrected" means and why the correction is needed.

      [2]
    3. (c)

      State the numbers of protons, neutrons and electrons in a neutral uranium-238 atom.

      counts =[3]
    4. (d)

      State one use and one hazard of ionising radiation.

      [3]

— End of paper —