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AIIMS 201926 May
Exam
AIIMS
Year
2019
Date
26 May
Subject
Physics
Chapter
Current Electricity

AIIMS 2019 · 26 May · Physics · Current Electricity

Assertion : A 60 ~W-220 ~V bulb glows more than a 100 ~W-220 ~V...

Assertion : A 60 W−220 V60 \mathrm{~W}-220 \mathrm{~V} bulb glows more than a 100 W−220 V100 \mathrm{~W}-220 \mathrm{~V} bulb when they are connected in series across a potential difference. Reason : When they are connected in series, resistance of 100 W100 \mathrm{~W} bulb will be more.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false.

Step-by-step solution

As R∝1PR \propto \frac{1}{P}, resistance of 100 W100 \mathrm{~W} bulb is less than that of 60 W60 \mathrm{~W} bulb. Since resistance of 60 W60 \mathrm{~W} is more, its filament produces more heat and glows more due to higher temperature. Resistance RR is inversely proportional to wattage WW, i.e., R∝1/WR \propto 1 / W.
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