Match List I (Zone) with List II (Day time sound limits in dB as per Noise Pollution Rules, 2000).

List I

i.Industrial

ii.Commercial

iii.Residential

iv.Silence

List II

a.50

b.65

c.75

d.55

Ai-c, ii-b, iii-d, iv-a ✓ Correct

Bi-c, ii-d, iii-b, iv-a

Ci-a, ii-d, iii-b, iv-c

Di-a, ii-b, iii-d, iv-c

Correct answer: (A) i-c, ii-b, iii-d, iv-a

Explanation

Under the 2000 noise rules the daytime limits fall from industrial highest to silence zone lowest.

Industrial zones allow the loudest daytime limit at 75 dB.

Commercial zones are set at 65 dB during the day.

Residential areas are held to 55 dB in daytime.

Silence zones near hospitals and schools have the strictest 50 dB daytime limit.

Night-time limits are lower still, dropping by about ten decibels in each zone.

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