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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:

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 2:

Class : Class 8
The answer is B

Ans 3:

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:

Class : Class 7
answer should be b because X will also lit up

Ans 5:

Class : Class 10

Ans 6:

Class : Class 9
Yess,my answer was B also

Ans 7:

Class : Class 8
logically it should be B but sof says otherwise. why ????

Ans 8:

Class : Class 4
answer should be B

Ans 9:

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 10:

Class : Class 6
The answer should be B as it will be closed circuit

Ans 11:

Class : Class 8
The answer key says that X will not light up,but why?

Ans 12:

Class : Class 8
X will light up... I think it's incorrect....

Ans 13:

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 14:

Class : Class 8

Ans 15:

Class : Class 8
Please explain it. I am also confused about the answer. I myself did B.

Ans 16:

Class : Class 9
yes i too did B

Ans 17:

Class : Class 9

Ans 18:

Class : Class 10
b

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