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MCQs

Total Questions : 188 | Page 7 of 19 pages
Question 61. Statement 1: When alcohol is allowed to move from chamber A to chamber B when a barrier between them is removed, it is called multi phase diffusion.
Statement 2: When oxygen is made to diffuse into the water, it’s called continuous molecular diffusion.
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option D. -> False, True
Answer: (d).False, True
Question 62. Velocity gradient is the main driving force in mass transfer.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 63. A phase boundary between alcohol and water exists.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 64. Statement 1: Diffusion is faster than convective mass transfer.
Statement 2: Mass transfer is proportional to the area of contact.
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option D. -> False, True
Answer: (d).False, True
Question 65. Statement 1: A phase boundary exists between alcohol and oxygen.
Statement 2: Phase boundary varies with agitation. It is inversely proportional to the amount of agitation provided.
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option B. -> True, True
Answer: (b).True, True
Question 66. Ratio of equilibrium concentrations of solute A in liquid phase and gas phase i.e. CAL* and CAg* respectively is α. α is called _____
  1.    Diffusion coefficient
  2.    Distribution coefficient
  3.    Mass transfer coefficient
  4.    None of the mentioned
 Discuss Question
Answer: Option B. -> Distribution coefficient
Answer: (b).Distribution coefficient
Question 67. Statement 1: Diffusion of gas component through the resistive film to the bulk of the liquid is the rate determining step.
Statement 2: Diffusion of gas component through the gas-liquid inter-phase is the rate determining step.
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option A. -> True, False
Answer: (a).True, False
Question 68. Statement 1: Resistance is inversely proportional to the inter-facial area.
Statement 2: The inter-facial area of a body is the area of the dispersed phase in a unit volume of the vessel.
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option B. -> True, True
Answer: (b).True, True
Question 69. Statement 1: Concentration is a product of diffusivity and solubility.
Statement 2: Permeability coefficient in case of food packaging can be written as product of partial pressure and solubility using Henry’s law.
  1.    True, False
  2.    True, True
  3.    False, False
  4.    False, True
 Discuss Question
Answer: Option B. -> True, True
Answer: (b).True, True
Question 70. In a packaging of dry grapes, the packaging material is made of polyethylene. The dry grapes have certain moisture content. Which of the following is true with respect to the diffusion of certain amount of moisture through the packing?
  1.    The moisture will not diffuse
  2.    The diffusion in this case is called permeability
  3.    None of the mentioned
  4.    Neither of the mentioned
 Discuss Question
Answer: Option B. -> The diffusion in this case is called permeability
Answer: (b).The diffusion in this case is called permeability

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