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Chapter 5 Practice Paper: D.C. Circuits — question paper

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QQ/S4CPH/CH5

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

Chapter 5 Practice Paper

D.C. Circuits

Duration: 40 minutes
Total: 30 marks
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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. Chapter 5 (circuit symbols — cells, switches, lamps, LEDs, resistors, fuses, meters; series and parallel rules for current and p.d.; effective resistance formulae; whole-circuit R = V/I).

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

Section A: Multiple-choice questions[10 marks]

Choose the one correct answer for each question.

  1. 1

    An ammeter is connected into a circuit

    1. Ain parallel with the supply
    2. Bin series, so the charge flows through it
    3. Cacross the switch
    4. Danywhere at all
    ( )
  2. 2

    In a series circuit, the current at every point is

    1. Athe same
    2. Bhalved at each component
    3. Cused up by the first lamp
    4. Dzero after the first branch
    ( )
  3. 3

    Two resistors of 3.0 Ω and 6.0 Ω are connected in parallel. Their effective resistance is

    1. A9.0 Ω
    2. B18 Ω
    3. C2.0 Ω
    4. D4.5 Ω
    ( )
  4. 4

    Lamps in a house are wired in parallel mainly so that each lamp

    1. Ashares the supply current equally
    2. Bgets the full supply p.d. and can be switched independently
    3. Chas zero resistance
    4. Dcarries all the current
    ( )
  5. 5

    A 12 V battery drives a series circuit of total resistance 4.0 Ω. The current is

    1. A0.33 A
    2. B16 A
    3. C3.0 A
    4. D48 A
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided. Show all necessary working.

  1. 1

    State the circuit rules being described.

    1. (a)

      State the current rule for a series circuit and the current rule for a parallel circuit.

      [2]
    2. (b)

      State the p.d. rule for a series circuit and for a parallel circuit.

      [2]
    3. (c)

      State which meter is wired in series in a circuit and which meter is wired in parallel.

      [2]
  2. 2

    A 12 V battery is connected to a 2.0 Ω resistor in series with a parallel pair of two 4.0 Ω resistors.

    1. (a)

      Calculate the effective resistance of the parallel pair.

      R =Ω[2]
    2. (b)

      Calculate the total resistance of the circuit and the current from the battery.

      I =A[3]
    3. (c)

      Calculate the p.d. across the parallel pair.

      V =V[2]
  3. 3

    A designer compares two ways to light two identical 6.0 Ω lamps from a 12 V battery: in series, or in parallel.

    1. (a)

      For the series connection, calculate the current and the p.d. across each lamp.

      I =A[3]
    2. (b)

      For the parallel connection, calculate the current through each lamp and the total current from the battery.

      I(total) =A[3]
    3. (c)

      State one advantage of the parallel arrangement for real lighting.

      [1]

— End of paper —