engineering recuitment UPSSSC JE Civil 2024 Mock Test Environmental Engineering Air and Noise Pollution

IS: 4954-1968 के अनुसार, शहरी आवासीय क्षेत्र में स्वीकार्य बाहरी रव स्तर________है।

1
25-35 dB
2
45-50 dB
3
35-45 dB
4
50-60 dB
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