Paper 1 · People, Development and Environment
UGC NET June 2024 Re-Exam (28.08.2024) Shift-I
Which of the following indices represents the background level of noise pollution?
AL10
BL25
CL50
DL90 ✓ Correct
Correct answer: (D) L90 — The background noise level is represented by L90, so that is the answer.
Explanation
★The background noise level is represented by L90, so that is the answer.
★These indices describe the sound level exceeded for a given percentage of time.
★L90 is the level exceeded for 90 percent of the measurement period.
★Since it is present most of the time, it reflects the steady background noise.
★So L90 represents the background level of noise pollution.
★L10 reflects peak noise, while L25 and L50 are intermediate levels.
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