Question 21 : The acidic air pollutants reach the Earth's surface because of wet deposition only.
1. True
2. False
3.
4.
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Question 22 : What is/are the inertial method(s) used to measure size of aerosol particles?
1. Particle acceleration method
2. Pulsation method
3. Multi cyclone
4. All of the mentioned
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Question 23 : Formation of aerosols by nucleation produces particles of size __________
1. Less than 0.1 micron
2. Greater than 0.1 micron
3. Less than 1 micron
4. Greater than 1 micron
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Question 24 : What does the term 'liming' mean?
1. Application of magnesium and calcium rich substances to soil
2. Erosion of calcium carbonate(lime) zones in soil
3. Excessive growth of lemon trees in acid rain prone regions
4. None of the mentioned
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Question 25 : When light is passed through a suspension, it's intensity decreases due to _________
1. Both scattering and diffraction
2. Both diffraction and absorption
3. Absorption only
4. Both scattering and absorption
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Question 26 : Which of the following gases is responsible for the yellowing of the Taj Mahal?
1. Organic carbon
2. Black carbon
3. Brown carbon
4. All of the mentioned
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Question 27 : Which of the following scattering phenomena is responsible for the blue colour of the sky?
1. Mie scattering
2. Diffraction
3. Rayleigh scattering
4. All of the mentioned
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Question 28 : Particle movement due to photophoresis depends on _________
1. Shape and size of the particle
2. Optical properties of the particle
3. Wavelength and intensity of incident light
4. All of the mentioned
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Question 29 : Which of the following aerosols have the best absorbing properties?
1. Carbon black
2. Soot
3. Elemental Carbon
4. All of the mentioned
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Question 30 : Which of the following constituent of photochemical smog causes the bronzing of plants?
1. PBN
2. PAN
3. PFN
4. Ketones
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