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Chapter 6 Practice Paper: Current of Electricity — question paper

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QQ/S4PH/CH6

Secondary 4 · Physics (G2 / G3)

Chapter 6 Practice Paper

Current of Electricity

Duration: 40 minutes
Total: 30 marks
Name:
Class:
Register No.:
Date:

READ THESE INSTRUCTIONS FIRST

  • Write your name, class and register number in the spaces at the top of this page.
  • Answer all questions.
  • Give numerical answers correct to 3 significant figures unless stated otherwise, with units where a quantity is calculated.
  • Sketch graphs should be labelled on both axes.
  • The number of marks is given in brackets [ ] at the end of each question or part question.
  • The total number of marks for this paper is 30.

Original practice material written for the MOE Physics syllabus. It is not an official MOE or school examination paper. Current as rate of flow of charge, Q = It, conventional current vs electron flow, e.m.f. and potential difference, R = V/I, resistance of a wire (length, cross-sectional area, temperature), I–V graphs of ohmic conductors, filament lamps and diodes.

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

    Electric current is best described as the rate of flow of

    1. Avoltage
    2. Benergy
    3. Cresistance
    4. Dcharge
    ( )
  2. 2

    In the external circuit, conventional current is taken to flow

    1. Afrom the positive terminal to the negative terminal
    2. Bfrom the negative terminal to the positive terminal
    3. Cin the same direction as the electrons
    4. Donly inside the battery
    ( )
  3. 3

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

    1. A1.5 Ω
    2. B24 Ω
    3. C0.042 Ω
    4. D48 Ω
    ( )
  4. 4

    A wire is replaced by one of the same material with double the length and half the diameter. Its resistance becomes

    1. Athe same
    2. Btwice as large
    3. Ceight times as large
    4. Dfour times as large
    ( )
  5. 5

    As the voltage across a filament lamp is increased from zero, its I–V graph

    1. Ais a straight line through the origin
    2. Bfalls below the voltage axis
    3. Cbends over as the filament heats and its resistance rises
    4. Dshows no current at all until 0.7 V
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

  1. 1

    A phone charger delivers a steady current of 2.0 A for 30 minutes.

    1. (a)

      Define electric current.

      [2]
    2. (b)

      Calculate the charge that flows.

      charge =C[2]
    3. (c)

      Calculate the number of electrons that pass (electron charge = 1.6 × 10⁻¹⁹ C).

      [2]
  2. 2

    Wire P has length 80 cm, diameter 0.50 mm and resistance 3.6 Ω. Wire Q is made of the same material with length 160 cm and diameter 1.0 mm.

    1. (a)

      Explain, without calculation, whether Q’s resistance is lower or higher than P’s.

      [2]
    2. (b)

      Determine the resistance of resistor Q.

      resistance =Ω[2]
    3. (c)

      State and explain what happens to the resistance of a pure metal wire as its temperature rises.

      [3]
  3. 3

    A 6.0 V battery drives a current of 0.25 A through a fixed resistor.

    1. (a)

      Calculate the resistance of the resistor.

      resistance =Ω[2]
    2. (b)

      Calculate the charge flowing through the resistor in 4.0 minutes.

      charge =C[2]
    3. (c)

      State what is meant by the e.m.f. of the battery, and give its value in energy terms.

      [3]

— End of paper —