UPSC CAPF AC 2024 Paper

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Question : 112 of 125

Marks: +1, -0

Which one of the following statements correctly defines PMI particles in air?

These are suspended particles of diameter more than 10 micron
These are the particles that are filtered by the nose during respiration
These are extremely fine particles of diameter less than 1 micron.
These are coarse particles that penetrate directly through the lungs into the bloodstream

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