PPL Human Performance And Limitations Practice Questions - Sri Lanka CAA PPL(A) Human Performance And Limitations Examination Exam

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In aviation physiology, the 'physiological zone' of the atmosphere, where human respiration can function normally without supplementary oxygen, extends from sea level up to approximately what altitude?

10,000 feet 18,000 feet 5,000 feet 25,000 feet

Correct Answer:

10,000 feet

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