Question 6 — In Fig. 3.18: (i) If S2 - Questions at the end of the chapter - Chapter 3 Class 7 - Electricity: Circuits and their Components

Last updated at August 17, 2026 by

Q6 (Difficult): In Fig. 3.18: (i) If S2 is in 'ON' position, S1 is in 'OFF' position, which lamp(s) will glow? (ii) If S2 is in 'OFF' position, S1 is in 'ON' position, which lamp(s) will glow? (iii) If S1 and S2 both are in 'ON' position, which lamp(s) will glow? (iv) If both S1 and S2 are in 'OFF' position, which lamp(s) will glow?

Answer:
We have studied that switches control the flow of current in different circuit paths. This is why different switch combinations affect different lamps.

  • Each switch controls specific circuit branch
  • ON switch allows current to flow
  • OFF switch creates gap in circuit
  • Multiple paths can work independently

Conclusion: Only lamps in complete circuit paths will glow.

Switch Control Analysis S1 ON, S2 OFF Only S1 path complete S1 OFF, S2 ON Only S2 path complete Both ON All paths complete Both OFF No paths complete
Remove Ads
Teachoo · Class 7 Explore Class 7
CA Maninder Singh's photo - Co-founder, Teachoo

Made by

CA Maninder Singh

CA Maninder Singh is a Chartered Accountant with 16+ years of practical experience and 20+ years of teaching experience. At Teachoo, he simplifies Accounts, Tax and GST with step-by-step examples so students can apply concepts confidently in exams and real life.

For an uninterrupted learning experience, students can use Teachoo Black to remove ads and focus better.