NPTEL Air Pollution and Control Week 7 Assignment Answers 2025
1. What are the immediate health effects of exposure to indoor air pollutants?
- Respiratory diseases and cancer
- Irritation of eyes, nose, and throat
- Cardiovascular diseases
- Neurological
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2. Asbestosis, a serious progressive, long-term, non-cancer disease of the lungs is associated with the exposure of:
- Particulate matter
- Second hand smoke
- Asbestos
- Volatile organics compounds (VOCs)
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3. What is the primary goal of exposure assessment for indoor air pollutants?
- To enhance building aesthetics
- To identify pollutant sources and quantify risks
- To promote the use of natural ventilation
- To calculate construction costs
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4. Which type of sampling relies on the kinetic energy of gas molecules and diffusion of the gases in an enclosed space onto a sorbent medium.
- Active sampling
- Passive sampling
- Stratified sampling
- Cluster sampling
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5. Which method is commonly used in Computational Fluid Dynamics (CFD) modelling?
- Finite element method
- Box modelling
- Well-mixed model
- Stratified sampling
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6. Which modelling approach assumes spatially uniform pollutant concentrations indoors?
- Box model
- Well-mixed model
- CFD model
- Advection model
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7. What is the primary advantage of using HEPA filters for air cleaning?
- They remove both gaseous and particulate pollutants.
- They are cost-effective for large spaces.
- They effectively capture fine and ultrafine particles.
- They eliminate microbial contaminants.
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8. Which technology is most effective in reducing microbial contamination in indoor air?
- UVGI systems
- Ionizers
- Activated carbon filters
- Cyclone separators
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9. According to case study “Personal Exposure to Fine Particles: A Case Study” which method is used to measure personal exposure to PM2.5?
- High-volume air sampling
- Palm sized optical sensors
- Passive diffusion tubes
- Infrared imaging
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10. According to case study “Personal Exposure to Fine Particles: A Case Study” which activities had the highest exposure to fine particles?
- Traffic and cooking
- Market
- Workplace
- Classroom
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