Chapter 3 Practice Paper: Circuits and resistance — question paper (print)

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GCSE (9–1) · GCSE Physics (Foundation and Higher)

Chapter 3 Practice Paper

Circuits and resistance

Duration: 40 minutes

Total: 30 marks

Name:

Class:

Date:

READ THESE INSTRUCTIONS FIRST

Answer all questions.
Section A contains ten multiple-choice questions. Choose one answer, A, B, C or D, for each.
Section B contains structured questions. Write your answers in the spaces provided.
You may use a calculator.
The number of marks is given in brackets [ ] at the end of each question or part question.
The total mark for this paper is 30.

Original practice material written for the MOE GCSE Physics syllabus. It is not an official MOE or school examination paper. Chapter 3: circuit symbols, charge and current, V = IR, series and parallel rules, I–V characteristics, thermistors and LDRs, and the resistance required practicals.

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

Section A: Multiple-choice questions[10 marks]

Choose one answer for each question. Each question is worth 1 mark.

1
Charge flow is calculated from
1. Acurrent × time
2. Bvoltage × resistance
3. Ctime ÷ current
4. Dcurrent ÷ voltage
( )
2
A voltmeter is connected
1. Ain series with the component
2. Bin parallel across the component
3. Cbetween the cell and the switch only
4. Din place of the fuse
( )
3
Two 6 Ω resistors in parallel give a total resistance of
1. A12 Ω
2. B6 Ω
3. C3 Ω
4. D36 Ω
( )
4
Warming an NTC thermistor makes its resistance
1. Afall
2. Brise
3. Cstay constant
4. Dalternate
( )
5
A 12 V supply passes 2 A through a resistor. Its resistance is
1. A24 Ω
2. B0.17 Ω
3. C14 Ω
4. D6 Ω
( )
6
The I–V graph of a filament lamp flattens because the filament
1. Amelts
2. Bcools down
3. Cgets hotter and its resistance rises
4. Dstores charge
( )
7
In a parallel circuit the branch currents, compared with the supply current,
1. Aare each larger
2. Badd up to it
3. Care always equal to it
4. Dhave no relationship to it
( )
8
A diode conducts
1. Ain both directions equally
2. Bin neither direction
3. Conly above about 0.7 V forward
4. Donly when hot
( )
9
An LDR is taken from bright sunshine into a dark cupboard. Its resistance
1. Afalls
2. Bstays the same
3. Cbecomes zero
4. Drises
( )
10
A 6 V battery drives 3 Ω and 3 Ω in series. The current is
1. A0.5 A
2. B1.0 A
3. C2.0 A
4. D3.0 A
( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

11
A student sets up a circuit with a cell, a lamp, an ammeter and a voltmeter across the lamp.
1. (a)
  Name the placement of each meter.
  [2]
2. (b)
  The ammeter reads 0.40 A and the voltmeter reads 2.8 V. Calculate the lamp’s resistance.
  [2]
3. (c)
  State the charge that passes in 50 s.
  [1]
12
This question is about series and parallel circuits. A 6 V battery is connected first to a 2 Ω and a 4 Ω resistor in series, and then to the same two resistors in parallel.
1. (a)
  Calculate the total resistance and current in the series arrangement.
  [3]
2. (b)
  Calculate the p.d. across the 4 Ω resistor in the series arrangement.
  [1]
3. (c)
  Calculate the total resistance of the parallel arrangement.
  [2]
4. (d)
  Explain, in terms of paths for charge, why the parallel total is lower.
  [3]
13
A student investigates the resistance of a wire. The wire is clamped along a metre rule and connected to a low-voltage supply, an ammeter and a voltmeter measuring only the wire section in circuit.
Results
Length / m Current / A P.d. / V
0.20 0.50 0.60
0.40 0.50 1.20
0.60 0.50 1.80
0.80 0.50 2.40
1. (a)
  Calculate the resistance of the wire at each length and complete a resistance column.
  [2]
2. (b)
  Describe the relationship between length and resistance shown by the results.
  [2]
3. (c)
  Explain why the current was kept small and readings taken quickly.
  [2]

Length / m	Current / A	P.d. / V
0.20	0.50	0.60
0.40	0.50	1.20
0.60	0.50	1.80
0.80	0.50	2.40

— End of paper —