Ambient noise levels on a site located in the vicinity of a busy road are expected to be in the range

A35 to 45 dB

B50 to 60 dB

C75 to 85 dB ✓ Correct

D110 to 120 dB

Correct answer: (C) 75 to 85 dB

Explanation

Ambient noise beside a busy road typically falls in the range of about 75 to 85 decibels.

A range of 35 to 45 decibels fits a quiet library or bedroom, far below road traffic.

A range of 50 to 60 decibels matches ordinary conversation or a calm office.

A range of 110 to 120 decibels reflects a rock concert or jet takeoff, well above street traffic.

Prolonged exposure above 85 decibels can gradually damage hearing.

Indian norms cap commercial-zone daytime noise near 65 decibels for comparison.

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