A LevelPhysicsEdexcelExam Questions3. Electric CircuitsResistance, Resistivity & Potential Dividers

Resistance, Resistivity & Potential Dividers (Edexcel A Level Physics): Multiple Choice Questions

Exam code: 9PH0

52 mins12 questions

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Resistance, Resistivity & Potential Dividers

1
1 mark

The intensity of light incident on a light dependent resistor (LDR) can vary both its electrical resistance R and the number of charge carriers per unit volume n. The light intensity on an LDR is increased.

Which row of the table describes the effect on R and n?

 

R

n

A

decreases

decreases

B

decreases

increases

C

increases

decreases

D

increases

increases

    Choose your answer

    2
    1 mark

    Two copper wires of the same length are connected in a circuit, as shown.

    A circuit diagram with a battery and two resistors in series, drawn as oblong shapes in the lower branch and labelled X on the left and Y on the right.

    The diameter of wire X is twice the diameter of wire Y.

    Wire X has resistance RX. Wire Y has resistance RY.

    Which of the following gives the value of RXRY?

    • 14

    • 12

    • 2

    • 4

    Choose your answer

    3
    1 mark

    A light dependent resistor (LDR) and a resistor are connected to a battery, as shown.

    q7-nov-2021-9ph0-01-edexcel-as-a-level-phy

    The intensity of light incident on the LDR increases.

    Which row of the table describes the change in the resistance of the LDR and the change in the potential difference across the resistor?

     

    Resistance of LDR

    Potential difference across the resistor

    A

    decreases

    decreases

    B

    decreases

    increases

    C

    increases

    decreases

    D

    increases

    increases

      Choose your answer

      4
      1 mark

      The current in a length L of uniform wire XY is constant.

      The current enters the wire at X and leaves the wire at Y. The potential V at points along the wire is measured relative to Y.

      Which of the following graphs shows how V varies with the distance d from X?

      Four small graphs of potential V against distance d in a 2 by 2 grid, labelled A, B, C and D, each with d running from 0 to L. A shows a horizontal line at a constant positive value. B shows a straight line falling from a maximum at d equals 0 to zero at d equals L. C shows a curve falling steeply at first and then levelling off towards zero at d equals L. D shows a straight line starting from the origin and increasing linearly.

        Choose your answer

        5
        1 mark

        A light dependent resistor is connected across a cell of negligible internal resistance.

        The light intensity is increased.

        Which of the following statements about the current is correct?

        • It decreases because there is an increase in the number of conduction electrons.

        • It increases because there is an increase in the number of conduction electrons.

        • It decreases because the amplitude of lattice vibrations decreases.

        • It increases because the amplitude of lattice vibrations increases.

        Choose your answer