Question

In the circuits A, B, C and D, with switch S open, the lamps Q and R would light up but not lamp P in:



(1) circuit A
(2) circuit B
(3) circuit C
(4) circuit D

Answer 1

Out of all the given circuits, only in circuit B, the lamp P will not light up while the lamps Q and R would light up with switch S open. Because there is no current flowing in the wire containing lamp P due to an incomplete circuit, so it will not light up. Whereas, both other lamps in circuit B will light up with the switch S open because the circuit containing lamps Q and R is complete .

Hence, the correct answer is option 2.