Paper 1 · People, Development and Environment
UGC NET December 2023 (13.12.2023) Shift-I
Given below are two statements. In the light of the above statements, choose the most appropriate answer from the options given below.
- Statement I: RSPM are those suspended particulate matters (SPM) whose aerodynamic diameter is more than 10 micron.
- Statement II: Fine particles are those SPM whose aerodynamic diameter is less than 2.5 micron.
ABoth Statement I and Statement II are correct
BBoth Statement I and Statement II are incorrect
CStatement I is correct but Statement II is incorrect
DStatement I is incorrect but Statement II is correct ✓ Correct
Correct answer: (D) Statement I is incorrect but Statement II is correct — Statement I is incorrect but Statement II is correct, so that is the answer.
Explanation
★Statement I is incorrect but Statement II is correct, so that is the answer.
★RSPM means respirable suspended particulate matter, the fraction that can be inhaled.
★RSPM particles have an aerodynamic diameter of 10 micron or less, not more, so Statement I is wrong.
★Fine particles are the smallest of these airborne particles.
★They have an aerodynamic diameter of less than 2.5 micron.
★So Statement II correctly defines fine particles.
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