railway RRB JE (CBT I + CBT II) Mock Test 2024 Environmental Engineering Air and Noise Pollution

As per IS 1950: 1962, what is the maximum acceptable noise levels Inside office, from the point of view of comfort, economy and practical consideration?

1
20 to 35 dB
2
20 to 30 dB
3
50 to 60 dB
4
45 to 50 dB
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