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yagna from DPS, Surat
Subject :NSO    Class : Class 8

Two identical light bulbs X and Y are connected in series as shown in the sketch below. How will the brightness of the bulbs change if switch S is closed?


A X-brighter, Y-dimmer
B X-dimmer, Y-brighter
C X-brighter, Y-not lit up
D X-not lit up, Y-brighter.


B SHOULD COME

Ans 1:

SaiKrishna from Chettinad Vidyashram, Chennai
Class : Class 3
Option D is correct because current prefers the path that offers less resistance. The bulb provides resistance whereas the switch when closed does not. Hence correct answer is D

Ans 2:

AANYA BARANWAL from KPS SCHOOL, bhilai
Class : Class 5
answer should be B

Ans 3:

Yatharth Agrawal from Indira National school, Pune
Class : Class 8
It must be B.The current finds a more direct path to Y, Making it brighter.But the current still reaches X because there is still a path. SOF Says otherwise.

Ans 4:

Akshay Malhan from NHSS, Thane
Class : Class 8
logically it should be B but sof says otherwise. why ????

Ans 5:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 7
answer should be b because X will also lit up

Ans 6:

Avyukth Radhakrishnan from TSRS, Gurgaon
Class : Class 10
b

Ans 7:

Prabhav Kaushik from DPS Noida, Noida
Class : Class 10

Ans 8:

Abhay Agarwal from St Francis School, Ghaziabad
Class : Class 9
yes i too did B

Ans 9:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 7
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb is correct as current will flow though X but I do feel that current will prefer less resistant path so D can also be correct

Ans 10:

Priyanshi from Delhi Public School Agra, Agra
Class : Class 9
Yess,my answer was B also

Ans 11:

Vishwanath Halkeri from sudarshan vidya mandir, Bangalore
Class : Class 8

Ans 12:

Kingshuk Gupta from RN Podar school, Mumbai
Class : Class 9

Ans 13:

Vaidheesh Bharadwaj from NPS, Bangalore
Class : Class 7
I too am confused as current will also flow through both the bulbs when circuit is closed. It will pass through the switch first and hence lighting up bulb Y.

Ans 14:

vatsal jay gandhi from new era senior secondary school, Vadodara
Class : Class 8
Please explain it. I am also confused about the answer. I myself did B.

Ans 15:

Dev Rawat from R D Rajpal School, New Delhi
Class : Class 8
The answer is B

Ans 16:

Advait talnikar from Dhruv Global School, Sangamner
Class : Class 6
The answer should be B as it will be closed circuit

Ans 17:

Triguna from Kendriya Vidyalaya No.1 Salt Lake, Kolkata
Class : Class 8
X will light up... I think it's incorrect....

Ans 18:

Nilanjana De from Delhi Public School North, Bengaluru
Class : Class 8
The answer key says that X will not light up,but why?

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