DP Physics (first assessment 2025)

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Question 22M.1A.SL.TZ2.21

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.1A.SL.TZ2.21
Level SL Paper 1A Time zone TZ2
Command term Question number 21 Adapted from N/A
21.
[Maximum mark: 1]
22M.1A.SL.TZ2.21

A circuit consists of a cell of emf E = 3.0 V and four resistors connected as shown. Resistors R1 and R4 are 1.0 Ω and resistors R2 and R3 are 2.0 Ω.

What is the voltmeter reading?

A.  0.50 V

B.  1.0 V

C.  1.5 V

D.  2.0 V

[1]

Markscheme

B

Examiners report

There were some comments from teachers that the circuit is unfamiliar, however it is basically a series and parallel circuit and can be solved by considering the parallel sections individually either by calculating the current through each and then the voltages across the individual resistors or by considering the resistors as a potential divider. It has a low discrimination index at HL with many choosing option C (B correct) and very poor discrimination at SL, again with option C the most popular choice.

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