engineering recuitment BHEL Engineer Trainee Mock Test 2025 Environmental Engineering Air and Noise Pollution

दो स्रोत क्रमशः 60 dB और 65 dB का ध्वनि स्तर उत्पन्न करते हैं, तो परिणामी ध्वनि स्तर क्या होगा?

1
68
2
66
3
65
4
62.5
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