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MCQs

Total Questions : 360 | Page 32 of 36 pages
Question 311. Which air pollutant cause corrosion of building?
  1.    SO₂
  2.    SO₃
  3.    CO
  4.    NO₂
 Discuss Question
Answer: Option A. -> SO₂
Answer: (a).SO₂
Question 312. Concentration of fluorine that cause a phototoxicological effect on the plant is ___________
  1.    0.1μg/m³
  2.    0.3μg/m³
  3.    0.5μg/m³
  4.    1μg/m³
 Discuss Question
Answer: Option B. -> 0.3μg/m³
Answer: (b).0.3μg/m³
Question 313. The size of cigarette particles is ______________
  1.    1μm
  2.    10μm
  3.    <1μm
  4.    >10μm
 Discuss Question
Answer: Option C. -> <1μm
Answer: (c).<1μm
Question 314. Which of the following gas is not colorless?
  1.    NO
  2.    O₃
  3.    Pb
  4.    SO₃
 Discuss Question
Answer: Option A. -> NO
Answer: (a).NO
Question 315. Which of the following air pollutant effects plants the most?
  1.    Fluorine
  2.    SO₂
  3.    PAN
  4.    HCl
 Discuss Question
Answer: Option A. -> Fluorine
Answer: (a).Fluorine
Question 316. 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
 Discuss Question
Answer: Option B. -> Vapour pressure about a droplet increases with decrease in diameter of the droplet
Answer: (b).Vapour pressure about a droplet increases with decrease in diameter of the droplet
Question 317. 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
 Discuss Question
Answer: Option C. -> Thermophoresis
Answer: (c).Thermophoresis
Question 318. 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
 Discuss Question
Answer: Option D. -> All of the mentioned
Answer: (d).All of the mentioned
Question 319. The movement of particles from region of lower vapour to high vapour molecule concentration is known as diffusiophoresis.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 320. 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
 Discuss Question
Answer: Option C. -> Rayleigh scattering
Answer: (c).Rayleigh scattering

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