Paper 1 · People, Development and Environment
UGC NET June 2024 Re-Exam (04.09.2024) Shift-II
Which one of the following is considered to be the smallest particulate matter?
AFine mode particles
BNucleation mode particles ✓ Correct
CAitken mode particles
DAccumulation mode particles
Correct answer: (B) Nucleation mode particles — Nucleation mode particles are the smallest, so that is the answer.
Explanation
★Nucleation mode particles are the smallest, so that is the answer.
★Particulate matter comes in several size modes.
★Nucleation mode particles are 50 nanometres or less.
★They are the smallest of these groups.
★So the answer is nucleation mode particles.
★Hence the second option is correct.
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