Questions and answers for exam Preparation

MCQs

Total Questions : 99 | Page 5 of 10 pages

Question 41. Newtonian fluid is one in which the viscosity

remains constant with time and power input
increases with the level of power input
decreases with the level of power input
drastically increases with the level of power input

Discuss Question

Answer: Option A. -> remains constant with time and power input
Answer: (a).remains constant with time and power input

Question 42. The viscosity of a fluid increases with increasing stirrer speed. This fluid would be best described as being

newtonian
pseudoplastic
dilatant
thixotropic

Discuss Question

Answer: Option C. -> dilatant
Answer: (c).dilatant

Question 43. A fluid in which the viscosity increases with increasing stirrer speed and mixing time can be called as

newtonian fluid
pseudoplastic, thixotropic fluid
dilatant, rheopectic fluid
dilatant pseudoplastic fluid

Discuss Question

Answer: Option C. -> dilatant, rheopectic fluid
Answer: (c).dilatant, rheopectic fluid

Question 44. A fluid in which the viscosity decreases with increasing stirrer speed and mixing time, can be represented as

newtonian fluid
pseudoplastic, thixotropic fluid
dilatant, rheopectic fluid
dilatant, pseudoplastic fluid

Discuss Question

Answer: Option B. -> pseudoplastic, thixotropic fluid
Answer: (b).pseudoplastic, thixotropic fluid

Question 45. The medium will have the highest viscosity (considering that the cells do not secrete gums) with the presence of

single celled bacteria
filamentous fungi that form pellets
filamentous fungi that grow as long poorly branched chains
yeast

Discuss Question

Answer: Option C. -> filamentous fungi that grow as long poorly branched chains
Answer: (c).filamentous fungi that grow as long poorly branched chains

Question 46. The viscosity of liquid was classified as both dilatant and rheopectic, which means that the viscosity

increased with stirring speed but decreased with mixing time
increased with stirring speed and increased with mixing time
decreased with stirring speed but increased with mixing time
decreased with stirring speed and decreased with mixing time

Discuss Question

Answer: Option B. -> increased with stirring speed and increased with mixing time
Answer: (b).increased with stirring speed and increased with mixing time

Question 47. Which of the following describes the detrimental effect of bubbles on animal cells?

Cells trapped on the surface of bubbles can be damaged when the bubbles explode, releasing their pressure and surface energies
Cells trapped in the moving foam can be dragged apart by the bubbles
Both (a) and (b)
Bubbles can explode in the liquid medium causing the release of ultraviolet radiation

Discuss Question

Answer: Option C. -> Both (a) and (b)
Answer: (c).Both (a) and (b)

Question 48. Which of the following describes the detrimental effect of bubbles on animal cells?

Cells trapped on the surface of bubbles can be damaged when the bubbles explode, releasing their pressure and surface energies
Cells trapped in the moving foam can be dragged apart by the bubbles
Both (a) and (b)
Bubbles can explode in the liquid medium causing the release of ultraviolet radiation

Discuss Question

Answer: Option C. -> Both (a) and (b)

Question 49. The viscosity of liquid was classified as both dilatant and rheopectic, which means that the viscosity

increased with stirring speed but decreased with mixing time
increased with stirring speed and increased with mixing time
decreased with stirring speed but increased with mixing time
decreased with stirring speed and decreased with mixing time

Discuss Question

Answer: Option B. -> increased with stirring speed and increased with mixing time

Question 50. Bubble free aeration systems requires

silicone tubing or gas permeable membranes to facilitate gas transfer
carbon dioxide instead of air to supply oxygen
silicone tubing or gas permeable membranes to remove carbon dioxide by oxygen in the form of hydrogen peroxide
filled headspace of the reactor with carbon dioxide

Discuss Question

Answer: Option A. -> silicone tubing or gas permeable membranes to facilitate gas transfer