VoltageResistance quiz | Physics

Q1Paper 2

[1 mark]

The graph below shows the relationship between current (I) and potential difference (V) for a component. Which component does this graph represent?

A fixed resistor at constant temperatureA filament lampA thermistor at changing temperatureA diode in forward bias

Q2Paper 4

[3 marks]

Define electromotive force (E.M.F.) in terms of energy transfer.

Q3Paper 2

[1 mark]

A wire has length L, cross-sectional area A, and resistance R. The wire is replaced with another wire made of the same material with length 2L and area 2A. What is the new resistance?

R/2R2R4R

Q4Paper 2

[1 mark]

Why does a diode conduct electricity in only one direction?

It has infinite resistance in the reverse directionIt has very high resistance in the reverse directionIt only allows positive charges to flowThe current is too small to measure in reverse

Q5Paper 4

[3 marks]

A 12V battery drives a current of 2A through a lamp. Calculate the resistance of the lamp.

GIVEN DATA:

V = 12V

I = 2A

R = ?

Q6Paper 2

[1 mark]

A student wants to measure the potential difference (p.d.) across a resistor in a circuit. Which diagram shows the voltmeter connected correctly?

Diagram A - voltmeter in series with resistorDiagram B - voltmeter connected correctly in parallelDiagram C - voltmeter in parallel across the resistorDiagram D - voltmeter in series after the resistor

Q7Paper 4

[3 marks]

Define potential difference (p.d.) between two points in terms of energy and charge.

Q8Paper 2

[1 mark]

Three resistors of resistance 2Ω, 3Ω and 5Ω are connected in series to a 10V battery. What is the total resistance of the circuit?

0.83Ω1.67Ω10Ω50Ω

Q9Paper 6

A student investigates how the resistance of a wire depends on its length. Describe a suitable method for this experiment, including: (a) the circuit diagram, (b) measurements to be taken, (c) how to process the results.

📊 PRACTICAL CONTEXT:

This question tests Paper 6 skills: measurement reading, data recording, uncertainty calculation, and graph analysis.

Q10Paper 2

[1 mark]

The graph below shows how the resistance of a thermistor changes with temperature. What happens to the resistance as temperature increases?

Resistance increases steadilyResistance decreases rapidly then levels offResistance decreases steadilyResistance stays constant

Q11Paper 4

[3 marks]

A metal wire has length 2.0m, cross-sectional area 1.5 × 10⁻⁶ m² and resistance 0.80Ω. Calculate the resistivity of the metal. Use the equation ρ = RA/L.

GIVEN DATA:

L = 2.0 m

A = 1.5 × 10⁻⁶ m²

R = 0.80 Ω

Q12Paper 2

[1 mark]

Two identical resistors, each of resistance R, are connected in parallel. What is their combined resistance?

2RRR/2R/4

Q13Paper 4

[3 marks]

A 6.0V battery supplies a current of 0.50A to a lamp for 120 seconds. Calculate: (a) the electrical power of the lamp, (b) the total energy transferred.

GIVEN DATA:

V = 6.0 V

I = 0.50 A

t = 120 s

Q14Paper 6

The diagram shows a voltmeter connected to measure the p.d. across a resistor. The voltmeter reading is shown. (a) State the reading to the correct precision. (b) The voltmeter has an uncertainty of ±0.1V. Calculate the percentage uncertainty.

📊 PRACTICAL CONTEXT:

This question tests Paper 6 skills: measurement reading, data recording, uncertainty calculation, and graph analysis.

Q15Paper 2

[1 mark]

A circuit contains a 12V battery, a fixed resistor and an ammeter. When a second identical resistor is connected in parallel with the first resistor, what happens to: (i) the total resistance, (ii) the current from the battery?

Resistance increases, current decreasesResistance decreases, current increasesResistance increases, current increasesResistance decreases, current decreases

4.2.4 Voltage & Resistance - Exam Practice

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