Question 11 : Which of the following is a viable particulate?
1. Smoke
2. Mist
3. Dust
4. Moulds
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Question 12 : What does CNC stand for in the context of aerosol particles?
1. Cloudy nucleic condensation
2. Condensation nucleus counter
3. Chemical nucleic coagulation
4. Cloudy nucleic coagulation
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Question 13 : What is the statement of the Kelvin effect in fluid droplets?
1. Vapour pressure about a droplet decreases with decrease in diameter of the droplet
2. Vapour pressure about a droplet increases with decrease in diameter of the droplet
3. Vapour pressure of the droplet is independent of the diameter of the droplet
4. Vapour pressure of the droplet varies with the diameter of the droplet as well as the temperature
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Question 14 : Aerosols contribute to global warming.
1. True
2. False
3.
4.
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Question 15 : Glass containers are generally not preferred for sampling rain water. Why?
1. Glass containers are expensive
2. Glass containers are not easy to maintain
3. Glass containers affect the pH of the rain water
4. All of the mentioned
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Question 16 : The movement of particles from region of lower vapour to high vapour molecule concentration is known as diffusiophoresis.
1. True
2. False
3.
4.
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Question 17 : When a given gas has a temperature gradient, the aerosol particles move from higher temperature regions to low temperature regions. This effect is known as __________
1. Photophoresis
2. Diffusiophoresis
3. Thermophoresis
4. Diffusiophoresis or Thermophoresis
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Question 18 : What does the aerodynamic diameter of an aerosol indicate?
1. Size of the aerosol particle when floating in air
2. Equivalent diameter of a sphere having same volume as that of the aerosol
3. Average diameter of aerosol particles present in unit volume of air
4. Maximum size of aerosol particle that can float in air
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Question 19 : What is the pH required for the survival of aquatic animals and plants?
1. 7
2. 7.5
3. 6.5
4. 4.8
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Question 20 : What is the size range of respirable suspended particulate matter?
1. Less than 1 micrometre
2. Less than 10 micrometre
3. Less than 100 micrometre
4. Less than 0.1 micrometre
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