Previous year MCQs

General science UPPSC 2009 GS-I
Question

Of the two bulbs in a house, one glows brighter than the other. Which of the following statements is correct?

Answer & Solution

Answer: (Detailed Solution Below)

Option D: The dimmer bulb has larger resistance.

Detailed Solution:

The correct answer is “The dimmer bulb has larger resistance.”.
In a typical household circuit, bulbs are connected in parallel. The brightness of a bulb is determined by the power it dissipates, which can be calculated using the formula:

P = V^2 / R

​where P is the power (brightness), V is the voltage, and R is the resistance.

If the dimmer bulb has larger resistance: The power dissipated will be less for a given voltage, making it glow dimmer compared to the bulb with lower resistance.

Similar Questions:

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Assertion (A): If Ice collects on the freeze the cooling in the refrigerator is affected adversely.
Reason (R) : Ice is a poor conductor.

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Codes:
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