Air Pollution-1

1. Which of the following are not natural sources of pollutant?

A SO2

B H2S

C Radioactive fallout

D Fungal pores

Answer C

2.Which of the following gases vary significantly over time and place at the atmospheric boundary?

A Carbon Dioxide

B Water vapour

C Ozone

D Oxygen

Answer B

3. How does atmospheric pressure vary with increase in altitude?

A Decreases linearly

B Decreases exponentially

C Increases linearly

D Increase till stratosphere and then starts decresing with altitude

Answer B

4. When the reverse lapse rate occur, a dense cold stratum of air at ground level gets covered by lighter warmer air at higher level is known as

A Lapse rate

B Inversion

C Adiabatic lapse rate

D None of above

Answer B

5. Plume behaviour that occurs during warm seasons and clear skies associated with turbulent winds is….

A Coning

B Fanning

C Lofting

D Looping

Answer D

6. Which of the following is bad case of atmospheric condition for dispersion

A Fumigation

B Trapping

C Coning

D Fanning

Answer A

7. Factors Affecting Plume Rise are

A Exit velocity

B Wind Speed

C Lapse Rate

D All of the above

Answer D

8. According to BIS, a minimum stack height is

A 20m

B 40m

C 30m

D 50m

Answer C

9. What is SO2 emission rate if a thermal power plant burns 5.45 tonnes with 4.2% sulphur per hr

A 125.2 gm/sec

B 127.2 gm/sec

C 57gm/sec

D 121.2gm/sec

Answer B

10. Which of the following is secondary pollutant.

A SPM

B PAN

C SO2

D NO2

Answer B

11. When environmental Lapse Rate (ELR) is less is than Adiabatic Lapse Rate (ALR), then which of the following occurs?

A Sub adiabatic lapse rate

B Super adiabatic lapse rate

C Neutral lapse rate

D Adiabatic lapse rate

Answer A

12. Determine effective stack height of stack with following data: 

Stack ht-205m , Wind velo-3.56m/s, air temp-13℃, pressure-1000milibars, stack  gas velo-9.14m/s, stack gas temp-140℃.

A 211.54m

B 200m

C 300m

D 6.54m

Answer A

13. In Gaussian Equation σy  and σz indicates

A Pollutant release rate

B Effective height

C Standard deviations

D Concentration

Answer C

14. Which of the following are not natural sources of pollutant?

A SO2

B H2S

C Radioactive fallout

D Fungal pores

Answer C

15. Estimate stack height for particulate release rate of 875kg/hr.

A 100m

B 106.8m

C 60.3m

D 40m

Answer B

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