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MCQs

Total Questions : 99 | Page 7 of 10 pages
Question 61. . In sparged mammalian cell bioreactors, the cell damage is caused because of
  1.    shear stress arising during mixing of the cell culture fluid
  2.    shear stresses arising from the breakup of bubbles at the liquid surface
  3.    shear stresses between bubbles in foam at the liquid surface
  4.    all of the above
 Discuss Question
Answer: Option A. -> shear stress arising during mixing of the cell culture fluid
Question 62. .  The SI unit for viscosity is
  1.    kg.m-1.s-1
  2.    kg.m-2.s-2
  3.    kg.m-3.s-1
  4.    kg.m-1.s-2
 Discuss Question
Answer: Option A. -> kg.m-1.s-1
Question 63. . A Brookfield viscometer measures viscosity by determining
  1.    the shear stress
  2.    the shear rate
  3.    the shear stress and shear rate
  4.    the torque required to move an impeller at a set speed
 Discuss Question
Answer: Option D. -> the torque required to move an impeller at a set speed
Question 64. . Which of the following compound, if added to a solution will lead to the greatest increase in viscosity?
  1.    A globular protein
  2.    Glucose
  3.    A long chain protein such as albumin
  4.    Water
 Discuss Question
Answer: Option C. -> A long chain protein such as albumin
Question 65. . The viscous nature of a non-Newtonian fluid
  1.    remains constant with time and power input
  2.    changes with the level of power input and/or the length of time during which the fluid is mixed
  3.    is similar to that of a perfect gas
  4.    is similar to that of water
 Discuss Question
Answer: Option B. -> changes with the level of power input and/or the length of time during which the fluid is mixed
Question 66. . Which of the following factors will affect the sensitivity of animal cells to shear conditions?
  1.    Cell size
  2.    Availability of nutrients in the medium
  3.    The presence of shear protectorants in the medium
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 67. . The best described action of Pluronic F68 (non-ionic detergent) in a cell culture medium is that, it
  1.    acts on the surface properties of the cells and the culture medium
  2.    provides nutrients for the cells
  3.    acts as a flocculant
  4.    acts as a coagulant
 Discuss Question
Answer: Option A. -> acts on the surface properties of the cells and the culture medium
Question 68. . Water is a
  1.    newtonian fluid
  2.    pseudoplastic
  3.    dilatant
  4.    rheopectic
 Discuss Question
Answer: Option A. -> newtonian fluid
Question 69. . Which of the following affect the Kolmogorov eddy size?
  1.    Stirrer speed
  2.    Physical properties of the liquid
  3.    Size and type of impeller
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 70. . The viscosity of a fluid increases with the length of time that it is being mixed. This fluid would be best described as being
  1.    newtonian
  2.    rheopectic
  3.    viscoelastic
  4.    thixotropic
 Discuss Question
Answer: Option B. -> rheopectic

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