D.C. Circuits Exam-style MCQs | A-Level Physics AQA

Question 1

In this resistor network, the emf of the supply is 12 V and it has negligible internal resistance.

What is the reading on a voltmeter connected between points X and Y?

A

0 V

B

1 V

C

3 V

D

4 V

0

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1

Question 2

Resistors of resistance R, R and 3R are connected as shown.

What is the resistance of the arrangement?

73R

37R

65R

56R

0

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1

Question 3

Which row shows the resistances of an ideal ammeter and an ideal voltmeter?

A

B

C

D

0

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1

Question 4

A resistor with resistance R is made from metal wire of resistivity $\rho$ .

The length of the wire is L.

What is the diameter of the wire?

√π L2 ρ R

√π R2 ρ L

2√π Rρ L

2√π Lρ R

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Question 5

Resistors X and Y are connected in series with a 6.0 V battery of negligible internal resistance.

X has resistance R and Y has resistance $\frac{R}{2}$ .

A voltmeter of resistance R is connected across Y.

What is the reading on the voltmeter?

A

0.0 V

B

1.5 V

C

3.0 V

D

4.5 V

0

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1

Question 6

In the circuit shown, a potential difference of 3.0 V is applied across XY.

What is the current in the 5 Ω resistor?

A

0.38 A

B

0.60 A

C

0.75 A

D

2.7 A

0

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Question 7

Which is equivalent to the ohm?

A

J C⁻² s⁻¹

B

J C⁻² s

C

J s

D

J s⁻¹

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Question 8

A wire has a resistance R.

What is the resistance when both the length and radius of the wire are doubled?

4R

2R

2 R

4 R

0

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1

Question 9

Three resistors are connected in a circuit.

The resistance of each resistor is shown in the circuit diagram.

What is the total resistance of this circuit?

A

10.0 Ω

B

20.2 Ω

C

25.0 Ω

D

40.0 Ω

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Question 10

The diagram shows the conventional currents entering and leaving a junction in an electric circuit.

I₁ , I₂ , I₃ and I₄ are all positive.

Which statement is always true?

A

I₁+ I₂ = I₃ + I₄

B

I₁- I₂ + I₃ - I₄= 0

C

I₁= I₂ and I₃ = I₄

D

I₁+ I₂ + I₃ + I₄= 0

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Question 11

The potential difference across a lamp is 2.5 V. The current in the lamp is 20 mA.

What is the energy dissipated in the lamp in 3.0 hours?

A

0.050 J

B

0.15 J

C

9.0 J

D

540 J

0

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Question 12

The current in a wire is 20 mA.

How many electrons pass a point in the wire in 2 minutes?

A

2.5 × 10¹⁷

B

1.5 × 10¹⁹

C

2.5 × 10²⁰

D

1.5 × 10²²

0

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Question 13

A gas containing doubly-charged ions flows to give an electric current of 0.64 A

How many ions pass a point in 1.0 minute?

A

2.0 × 10¹⁸

B

4.0 × 10¹⁸

C

1.2 × 10²⁰

D

2.4 × 10²⁰

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Question 14

A mobile phone operates at a constant power of 200 mW

It has a 3.7 V lithium-ion battery that has a charge capacity of 9,400 C

What is the time taken for the battery to discharge completely?

A

2 hours

B

48 hours

C

120 hours

D

140 hours

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