Civil Engineering MCQAE Level Civil Engineering
What is the resultant noise level generated simultaneously from two sources with the same intensity of 90 dB each?
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Choose the correct answer
A
90 dB
B
95 dB
C
93 dB
D
91 dB
Correct Answer
C. 93 dB
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Two equal sound levels combine as L+10log10(2)=90+3=93 dB.
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This MCQ belongs to WBPSC AE Previous Years Questions Series. Full tests include timed attempts, rank comparison and subject-wise analysis.