Civil Services Haryana PSC HCS Mock Test 2024 General Knowledge Ecology and Environment Environment Problems

କାହାଦ୍ୱାରା ଶବ୍ଦର ତୀବ୍ରତା ମାପ କରାଯାଏ?

1
ଡେସିବେଲ୍ 
2
ଡାଇଓପଟର 
3
ପାର୍ସେକ 
4
ଏଗୁଡ଼ିକ ମଧ୍ୟରୁ କୌଣସିଟି ନୁହେଁ 
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