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GATE CE 2020 Environmental Engg. Quiz 5 (App update required to attempt this test)

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Question 1

Which one of the options contains ONLY primary air pollutants?

Question 2

An air parcel having 45 ° temperature moves from ground level to 450 m elevation in wet air following the “adiabatic lapse rate”. The resulting temperature of air parcel at 450 m elevation will be _____ ℃.

Question 3

In the figures, Group I represents the atmospheric temperature profiles (P, Q, R and S) and Group II represents dispersion of pollutants from a smoke stack (1, 2, 3 and 4). In the figures of Group I, the dashed line represents the dry adiabatic lapse rate, whereas the horizontal axis represents temperature and the vertical axis represents the altitude.

The correct match is

Question 4

Total suspended particulate matter (TSP) concentration in ambient air is to be measured using a high volume sampler. The filter used for this purpose had and initial dry weight of 10.574g. The filter was mounted in the sampler and the initial air flow rate through the filter was set at 2 m3/min. Sampling continued for 24 hours. The airflow after 24 hours was measured to be 1.2 m3/min. The dry weight of the filter paper after 24 hour sampling was 12.345g. Assuming a linear decline in the air flow rate during sampling, what is the 24 hour sampling, what is the 24 average TSP concentration (in μg/m3) in the ambient air?

Question 5

A 75 dB noise lasting for 15 minutes is followed by 50 dB for 60 minutes which is followed by 80 dB for 10 minutes. The Leq value (in dB) for fluctuating noise level for 85 minutes is

Question 6

A noise meter located at a distance of 30 m from a point source recorded 74 dB . The reading at a distance of 60 m from the point source would be _________
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Feb 4ESE & GATE CE