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Subject :NSO    Class : Class 6

The given circuit diagram shows four bulbs in a circuit. Where should a switch be installed so that only one bulb can be switched on or off while the others remain lit all the time ?

(A) A

(B) B

(C) C

(D) D
explain it plz

Ans 1:

Class : Class 6
Answer is B,because if we keep switch ahead of bulb b so it will block electrons of B path so the electrons will pass through A,C,D and they will be lit all time .

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