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

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

/

1

Question 3

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

A

B

C

D

0

/

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

0

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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

/

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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1

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

0

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1

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

0

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1