Teaching UGC NET Mock Test Series 2025 (Paper 1 & 2) People Development & Environment Environmental Issues Pollution

एक स्वस्थ मानव कान द्वारा सबसे मंद पता लगाने योग्य शोर है:

1
0 dB
2
1 dB
3
10 dB
4
20 dB
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