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Question 20N.1A.SL.TZ0.21

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.1A.SL.TZ0.21
Level SL Paper 1A Time zone TZ0
Command term Question number 21 Adapted from N/A
21.
[Maximum mark: 1]
20N.1A.SL.TZ0.21

Four resistors of 4 Ω each are connected as shown.

What is the effective resistance between P and Q?

A.  1.0 Ω

B.  2.4 Ω

C.  3.4 Ω

D.  4.0 Ω

[1]

Markscheme

B

Examiners report

This has a very low discrimination index. It is suspected that students did not realise that PQ has 2 branches in parallel and many chose D, 4 ohm, the value of a single resistor.

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