Questions and answers for exam Preparation

MCQs

Total Questions : 99 | Page 1 of 10 pages

Question 1. Pluronic F68 protects mammalian cells from damage stems as it is a/an

surface active agent which stabilizes foams
surface active agent which destabilizes foams
excellent source of vitamins
coagulant

Discuss Question

Answer: Option A. -> surface active agent which stabilizes foams
Answer: (a).surface active agent which stabilizes foams

Question 2. Which of the following describes the importance of the Kolmogorov eddy size in the biotechnology?

The Kolmogorov eddy size is a measure of the smallest eddy size in a liquid
When the Kolmogorov eddy size become equivalent or smaller than the cell or particle diameter, then the cell or particle will become susceptible to shear damage
At the Kolmogorov eddy size, much of the energy of the originating eddy will be released
All of the above

Discuss Question

Answer: Option D. -> All of the above
Answer: (d).All of the above

Question 3. Reynolds number for turbulent flow over a plate should be more than

5 x 10⁵
10⁶
5 x 10⁵
500

Discuss Question

Answer: Option B. -> 10⁶
Answer: (b).10⁶

Question 4. If the viscosity of a fluid decreases with the length of time that it is being mixed, then this fluid is

newtonian
rheopectic
viscoelastic
thixotropic

Discuss Question

Answer: Option D. -> thixotropic
Answer: (d).thixotropic

Question 5. A stirred tank reactor containing a fluid with a density of 2.5 g.ml¹ and viscosity of 0.002 kg m¹s¹ is mixed at 120 rpm. If the fluid is mixed with an impeller having diameter 50 cm, then the Reynolds number of the liquid in the reactor is

2500
100
12,50,000
1,000,000

Discuss Question

Answer: Option C. -> 12,50,000
Answer: (c).12,50,000

Question 6. The viscosity of water at STP is approximately

0.005 kg.m¹.s¹
0.001 kg.m¹.s¹
0.003 kg.m².s¹
0.1 g.cm¹.s¹

Discuss Question

Answer: Option B. -> 0.001 kg.m¹.s¹
Answer: (b).0.001 kg.m¹.s¹

Question 7. Filamentous fungal cells are more shear sensitive than bacterial cells because of

the presence of citin in cell walls of filamentous fungi
larger in size than bacterial cells and therefore are more susceptible to shear forces
fungal cells are much larger than bacterial cells
all of the above

Discuss Question

Answer: Option D. -> all of the above
Answer: (d).all of the above

Question 8. 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
Answer: (a).silicone tubing or gas permeable membranes to facilitate gas transfer

Question 9. Non-linear relationship between shear stress and shear rate exists in