Previous year MCQs

General science UPPSC 2007 GS-I
Question

Sodium vapor lamps are used in road lighting because

Answer & Solution

Answer: (Detailed Solution Below)

Option B: Their light is monochromatic and does not scatter when passing through water droplets

Detailed Solution:

The correct answer is “Their light is monochromatic and does not scatter when passing through water droplets”.
The reason sodium vapor lamps are used in road lighting is because their light is monochromatic and does not scatter much when passing through water droplets. This reduces glare and improves visibility during rainy conditions.

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