A-LevelPhysicsD.C. circuits9702/12 · May/June 2011 · Q361 Mark

Safety on railways is increased by using several electrical switches. In the diagram, switches P, Q, R, S and T control the current through a green lamp. [Figure 36.0] Which row does not allow the green lamp to light?

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AP: closed, Q: closed, R: closed, S: open, T: closed

BP: closed, Q: open, R: closed, S: closed, T: open

CP: closed, Q: open, R: open, S: closed, T: closed

DP: open, Q: open, R: closed, S: open, T: closed

✓ Correct answer

C: P: closed, Q: open, R: open, S: closed, T: closed

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2011 Paper 1 Variant 2, question 36.

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