Which of the following is correct?

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21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!

An Intiative by Sri Chaitanya

Dust is composed of solid particles of diameter over 1 μm (1-micron)

Particles of size of about 1 μm reach our lungs through nose

Particles of size over 5 μm are stopped in nasal passage

All of the above are correct

answer is D.

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Detailed Solution

Here, 1 micron is 1 millionth part of a meter, i.e., 1 μm.

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