At level above _____ , sound turns into harmful noise pollution?
Correct answer: A. 80db
- A. 80db
- B. 30db
- C. 100db
- D. 120db
Explanation
Sound levels above about 80 dB are commonly regarded as potentially harmful with sufficient exposure and may contribute to noise pollution. Students may choose 120 dB because it is near the pain threshold, but harmful noise begins at lower levels depending on duration and frequency.
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The human respiratory system conducts air to the alveoli, where oxygen and carbon dioxide exchange occurs across thin respiratory surfaces. Questions cover the nasal passage, trachea, bronchi, lungs, diaphragm and intercostal muscles, ventilation mechanics and gas transport, while distinguishing breathing and gaseous exchange from cellular respiration.
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