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Chapter 4 Practice Paper: Electric Charge and Current — question paper

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

Chapter 4 Practice Paper

Electric Charge and Current

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 4 (positive/negative charge in coulombs; current as rate of flow, conventional vs electron flow; Q = It; e.m.f. and p.d. in volts, p.d. as work per unit charge; R = V/I; resistance proportional to length and inversely to cross-sectional area).

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

    Charge flowing round a circuit is measured in which SI unit?

    1. Aampere
    2. Bvolt
    3. Cohm
    4. Dcoulomb
    ( )
  2. 2

    A steady current of 0.40 A passes a point in a circuit for 150 s. How much charge passes the point?

    1. A0.0027 C
    2. B60 C
    3. C150 C
    4. D375 C
    ( )
  3. 3

    In a metal wire, conventional current is drawn flowing

    1. Afrom + to −, opposite to the electron flow
    2. Bfrom − to +, with the electrons
    3. Cin circles
    4. Donly at switches
    ( )
  4. 4

    A resistor carries a current of 0.25 A when the p.d. across it is 6.0 V. Its resistance is

    1. A1.5 Ω
    2. B24 Ω
    3. C6.25 Ω
    4. D0.042 Ω
    ( )
  5. 5

    A wire is replaced by another of the same material with twice the length and half the cross-sectional area. Its resistance

    1. Ahalves
    2. Bstays the same
    3. Cdoubles
    4. Dis four times larger
    ( )

Section B: Structured questions[20 marks]

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

  1. 1

    A phone charger delivers a steady current of 0.40 A for 150 seconds, transferring charge through a circuit whose supply pushes the charges with 6.0 V.

    1. (a)

      Calculate the charge transferred in 150 s.

      charge =C[2]
    2. (b)

      State what the 6.0 V value represents.

      [2]
    3. (c)

      Calculate the total energy transferred by the 60 C of charge at 6.0 V.

      energy =J[2]
  2. 2

    A student measures the current through a fixed resistor for several potential differences: (2.0 V, 0.40 A), (4.0 V, 0.80 A), (6.0 V, 1.2 A).

    1. (a)

      Calculate R = V ÷ I for each set of readings.

      R =Ω[3]
    2. (b)

      State what the constant value of R shows about how the current responds to the p.d.

      [2]
    3. (c)

      Predict the current at 10 V, with a reason.

      [2]
  3. 3

    A length of nichrome wire has a resistance of 8.0 Ω.

    1. (a)

      State what happens to the resistance of a second nichrome wire of the same material and thickness but twice the length. Explain why.

      [2]
    2. (b)

      State what happens to the resistance of a third nichrome wire of the same length but half the cross-sectional area. Explain why.

      [2]
    3. (c)

      Calculate the resistance of a wire with twice the length AND half the cross-sectional area.

      R =Ω[2]
    4. (d)

      State one use of a high-resistance wire like nichrome.

      [1]

— End of paper —