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 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 2:
Class : Class 8
The answer is B
Ans 3:
Class : Class 6
answer should be b because X will also lit up
Ans 4:
Class : Class 8
The answer key says that X will not light up,but why?
Ans 5:
Class : Class 10
b
Ans 6:
Class : Class 8
Ans 7:
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:
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 9:
Class : Class 9
Ans 10:
Class : Class 9
Yess,my answer was B also
Ans 11:
Class : Class 8
answer should be B
Ans 12:
Class : Class 8
logically it should be B but sof says otherwise. why ????
Ans 13:
Class : Class 6
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 14:
Class : Class 8
Please explain it. I am also confused about the answer. I myself did B.
Ans 15:
Class : Class 8
Ans 16:
Class : Class 6
The answer should be B as it will be closed circuit
Ans 17:
Class : Class 9
yes i too did B
Ans 18:
Class : Class 8
X will light up... I think it's incorrect....