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

IS कोड 4954-1968 के अनुसार, उपनगरीय क्षेत्रों के लिए स्वीकार्य शोर स्तर कितना है?

1
45 – 55 db
2
30 – 40 db
3
20 – 30 db
4
25 – 30 db
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