Q.

The Particulate Matter (PM-10) exhaled from the polluted atmosphere is often filtered out during the process of

A. Coughing
B. Sneezing
C. A and B
D. Urination
Answer» B. Sneezing
Explanation: PM-10 is a particulate matter having an aerodynamic diameter of less than 10 gym. Particles larger than 10 microns tend to be filtered out in the nose and therefore do not enter the respiratory tract. 926.
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