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Current Electricity — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsCurrent Electricity1 Mark
Question
For two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.
  1. Both A and R are true, and R is the correct explanation of A.
  2. Both A and R are true, but R is not the correct explanation of A.
  3. A is true, but R is false.
  4. A is false, and R is also false.
Assertion: The 200W bulbs glows with more brightness than 100W bulbs.
Reason: A 100 watt bulb has more resistance than a 200W bulb.
✓

Answer

  1. Both A and R are true, but R is not the correct explanation of A.

Explanation:

The resistance, $\text{R}=\frac{\text{V}^2}{\text{p}},$ i.e., $\text{R}\propto\frac{1}{\text{P}}$ i.e., higher is the wattage of a bulb, lesser is the resistance and so it will glow bright.

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