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A: 60 dB
B: 20 dB
C: 100 dB
D: 160 dB
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Everyday Science MCQs Test Preparation | Latest 2021 Quiz FPSC, NTS, KPPSC, PPSC, SPSC, BPSC, OTS, UTS, PTS, CTS, ATS, ETEA MCQs Test Questions.