Air pollution and noise pollution miscellaneous
- 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 an initial dry weight of 9.787 g. The filter was mounted in the sampler and the initial air flow rate through the filter was set at 1.5 m³/min. Sampling continued for 24 hours. The airflow after 24 hours was measured to be 1.4 m³/min. The dry weight of the filter paper after 24 hours sampling was 10.283 g. Assuming a linear decline in the air flow rate during sampling, what is the 24 hours average TSP concentration in the ambient air?
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Initial volume of air flow in 1 hour = 1.5 × 60 = 90 m³/h
Volume after 24 hours = 1.4 × 60 = 84 m³/h
Change in weight of filter = 10.283 – 9.787 = 0.496 g
Volume of air passed in 24 hours = area of the diagram = 1/2 × (90 + 84) × 24 = 2088 m³.Average TSP concentration = Change in weight Volume of air passed = 0.496 = 237.5 mg/³. 2088 Correct Option: C
Initial volume of air flow in 1 hour = 1.5 × 60 = 90 m³/h
Volume after 24 hours = 1.4 × 60 = 84 m³/h
Change in weight of filter = 10.283 – 9.787 = 0.496 g
Volume of air passed in 24 hours = area of the diagram = 1/2 × (90 + 84) × 24 = 2088 m³.Average TSP concentration = Change in weight Volume of air passed = 0.496 = 237.5 mg/³. 2088
- An air parcel having 40°C temperature moves from ground level to 500 m elevation in dry air following the “adiabatic lapse rate”. The resulting temperature of air parcel at 500 m elevation will be
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Adiabatic lapse rate = 9.8°C/km
∴ Fall in temperature = 0.5 × 9.8 = 4.9°C
∴ Resulting temperature = 40 – 4.9 ≈ 35°C.Correct Option: A
Adiabatic lapse rate = 9.8°C/km
∴ Fall in temperature = 0.5 × 9.8 = 4.9°C
∴ Resulting temperature = 40 – 4.9 ≈ 35°C.
- According to the noise pollution (Regulation and Control) Rules, 2000, of the Ministry of Environment and Forests, India, the day time and night time noise level limits in ambient air for residential areas expressed in dB(A) Leg are
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Silence zone : 50 to 40
Residential zone : 55 to 45
Commercial zone : 66 to 55
Industrial zone : 75 to 70Correct Option: B
Silence zone : 50 to 40
Residential zone : 55 to 45
Commercial zone : 66 to 55
Industrial zone : 75 to 70
- Two primary air pollutants are
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NA
Correct Option: C
NA
- The dispersion of pollutants in atmosphere is maximum when
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NA
Correct Option: A
NA
