A) They have equal current through them
B) The resistance of the filaments of both the bulbs is same
C) The resistance of the filament of 40 W bulb is more than that of 100 watt bulb
D) The resistance of 100 watt bulb is more than 40 watt bulb
Correct Answer: C
Solution :
Here, the unknown is not indicated in the question, so the direction of thoughts is to be obtained from the options. [a] This option talks about current, in parallel only voltages are same. Current are different in different resistances. So this option wrong. [b]\[R\propto \frac{1}{P}\], since powers are different, resistances are also different. So, this option is also wrong. [c]\[R\propto \frac{1}{P}\], so resistance of the bulb having lesser rated power will be more. This option is correct. [d] If [c] is correct, [d] cannot be correct because these two options are mutually contradictory.
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