In a switching circuit, if the combination (S_1 S_2) is connected in parallel to the combination (S_1' S_2'), then the room is lit only when ...

MHT CET 2026 Mathematics question

Not in JEE syllabus

In a switching circuit, if the combination is connected in parallel to the combination , then the room is lit only when ...

(A)S is ON and S is OFF
(B)S is OFF and S is ON
(C)S and S both ON or S and S both OFFCorrect
(D)The room is always lit.

Answer: (C)

Solution

Switches in series correspond to and parallel combination to , so the circuit is . The first branch conducts only when and are both ON (both ). The second branch conducts only when and are both ON, i.e. when and are

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Question ID VK-100317