Consider the table given below providing details of traffic volume per hour for locations . When the total traffic volume is the same, the factor(s) which affect(s) the noise pollution level is/are

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Q: 145 (IAS/1995)
Consider the table given below providing details of traffic volume per hour for locations . When the total traffic volume is the same, the factor(s) which affect(s) the noise pollution level is/are
LocationTotal traffic volume% of Heavy VehiclesAverage noise level in dB (A)Noise pollution level, in dB (A)
I37724.473.584
II38012.572.683
III37730.073.586.5
IV22512.572.9880.9

question_subject: 

Logic/Reasoning

question_exam: 

IAS

stats: 

0,9,7,9,2,1,4

keywords: 

{'noise pollution level': [1, 1, 0, 0], 'total traffic volume': [0, 1, 0, 0], 'traffic volume': [0, 1, 0, 0], 'average noise level': [0, 1, 0, 0], 'table': [0, 0, 1, 0], 'heavy vehicles': [0, 1, 0, 0]}

The question is asking what factors impact noise pollution when the total traffic volume is the same. We can rule out the total traffic volume as a factor because it is constant in this context.

The correct answer is option 1 "% of heavy vehicles." We can deduce this because the percentage of heavy vehicles varies across different locations and there is a correlation between this percentage and the noise pollution level. For instance, location III has the highest percentage of heavy vehicles and also the highest noise pollution level.

Option 2 "noise pollution level and average noise level" doesn`t make sense because the noise pollution level is the variable we are trying to explain.

Option 3 "average noise level and % of heavy vehicles" can`t be correct because the average noise level remains the same for location I and III, but the noise pollution level is different.

Option 4 "indeterminable on the basis of details given" is incorrect because the data allows a clear deduction of the correct answer.