NPTEL Air Pollution and Control Week 12 Assignment Answers 2025
1. The filter paper used during the sampling of PM2.5 in the ambient air is known as PTFE filter paper, where PTFE refers to
- Poly tetra fluoro ethylamine
- Poly tetra fluoro ethyl
- Poly tetra fluoro ethylene
- Poly tetra fluoro ethanol
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2. According to National Ambient Air Quality Standards (NAAQS), what is the permissible value of 24 hour-concentration of PM2.5 in Ecologically Sensitive Area (Notified by Central Government)
- 40 μg/m3
- 60 μg/m3
- 80 μg/m3
- 100 μg/m3
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3. The absorbing reagent Potassium Tetrachloro mercurate (TCM) is used in sampling and analysis of:
- SO2
- NO2
- CO
- O3
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4. Modified Jacob & Hochheiser Method is used for sampling and analysis of:
- CO
- O3
- SO2
- NO2
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5. In which type of sampling the velocity and the direction of the gas entering the sampling nozzle is the same as that of the gas in the duct/stack at the same sampling point.
- Isothermal sampling
- Isokinetic sampling
- Adiabatic sampling
- Differential sampling
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6. Which of the following method is used to measure sulphur dioxide SO2 from the gas sample extracted from the sampling point of the stack.
- Barium thorin titration method
- Improved West and Gaeke method
- Modified Jacob and Hochheiser method
- Gravimetric method
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7. Which pollutants are typically monitored using multi-gas monitors?
- CO, CO2, VOCs, and ozone
- PM2.5 and PM10
- Heavy metals and ammonia
- Sulfur dioxide and nitrogen dioxide
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8. Which of the following parameters is measured using the non-dispersive infrared spectroscopy in multi gas monitor.
- Temperature
- Percent Relative Humidity (%RH)
- Carbon Monoxide (CO)
- Carbon Dioxide (CO2)
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9. What principle is commonly used in spectrometers to analyze particulate matter?
- Light scattering and laser diffraction
- Mass spectrometry
- Gravimetric analysis
- Infrared absorption
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10. The minimum time interval for monitoring of the particulate matter using the spectrometer software is:
- 45 seconds
- 30 seconds
- 12 seconds
- 6 seconds
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