Question 1 : Which of the following compounds was earlier produced for the utility of transformers?
1. PDD
2. PCDF
3. PCB
4. TCDD
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Question 2 : Which of the following is a bulk phenomena?
1. Physical adsorption
2. Chemical adsorption
3. Absorption
4. Sorption
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Question 3 : What is the residence time (average time a particle is active in a given system) of carbon monoxide?
1. 11-15 years
2. 0.1-0.3 years
3. 0.5 years
4. Few minutes
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Question 4 : Which air pollutant cause corrosion of building?
1. SO₂
2. SO₃
3. CO
4. NO₂
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Question 5 : What does the abbreviation VOC stand for?
1. Versatile Oxygenated Compounds
2. Volatile Oxygenated Compounds
3. Volatile Organic Carbons
4. Volatile Organic Compounds
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Question 6 : When Richardson number is equal to zero, what is the wind turbulence characteristic?
1. No vertical mixing
2. Weak mechanical turbulence due to stratification
3. Convective mixing is greater than mechanical turbulence
4. Only mechanical turbulence
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Question 7 : The minimum particle size removes by gravitational chamber is
1. >50μm
2. >10μm
3. >25μm
4. >0.5μm
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Question 8 : Below what Richardson number does convective mixing start dominating mechanical turbulence?
1. 0
2. -0.04
3. -0.03
4. -0.1
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Question 9 : Above which Richardson number does vertical mixing in winds disappear?
1. 1
2. 0.25
3. 0.5
4. 0.75
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Question 10 : Which is/are the most significant air-borne allergen(s)?
1. Fungi
2. Pollen
3. Soot
4. All of the mentioned
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