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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:

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

Ans 2:

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

Ans 3:

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 4:

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

Ans 5:

Prabhav Kaushik from DPS Noida, Noida
Class : Class 10

Ans 6:

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 7:

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 8:

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

Ans 9:

Avyukth Radhakrishnan from TSRS, Gurgaon
Class : Class 10
b

Ans 10:

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 11:

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

Ans 12:

ARNAV BARANWAL from KPS SCHOOL, bhilai
Class : Class 4
answer should be B

Ans 13:

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

Ans 14:

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

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:

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

Ans 18:

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.

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