Vinegar and Citric Acid MCQs : This section focuses on the "Vinegar and Citric Acid". These Multiple Choice Questions (MCQs) should be practiced to improve the Vinegar and Citric Acid skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
Vinegar is typically produced in fed batch reactors because
A. a fed batch reactor can be used to maintain low acetic acid concentrations
B. a fed batch reactor can be used to maintain low ethanol concentrations
C. acetic acid bacteria tend to ferment at high ethanol concentrations
D. All of the above
Question 2
For the recovery of citric acid after fermentation, Ca(OH)2 is added to the slurry to
A. precipitate calcium carbonate
B. precipitate calcium citrate
C. precipitate calcium phosphate
D. precipitate calcium sulphate
Question 3
Which of the following microorganism is used for the production of citric acid?
A. Lactobacillus bulgaricus
B. Saccharomyces cerevisiae
C. Aspergillus niger
D. Streptococcus lactis
Question 4
Sugar content of the fermentation medium for citric acid is maintained at
A. 10-15%
B. 15-20%
C. 20-25 %
D. 25-30 %
Question 5
Spirit vinegar is produced from
A. fruit juices
B. malted grain
C. ethanol
D. ale
Question 6
What is the pH of the medium when sucrose is used as substrate for the production of citric acid?
A. 3
B. 4
C. 5
D. 6
Question 7
In liquid surface culture process for the fermentation to produce citric acid,
A. A. niger is used with solid substrate as sweet potato
B. A. niger floats on the surface of solution
C. Fungal mycelium grows through out the solution in a deep tank
D. Both A and B
Question 8
What is the pH of the medium when molasses is used as substrate for the production of citric acid?
A. 3
B. 4
C. 5
D. 6
Question 9
Which of the following nitrogen sources is added in the fermentation medium of citric acid production?
A. Ammonium salt
B. Urea
C. Both A and B
D. Peptone
Question 10
In submerged process for the fermentation to produce citric acid,
A. A. niger is used with solid substrate as sweet potato
B. A. niger floats on the surface of solution
C. Fungal mycelium grows through out the solution in a deep tank
D. Both A and B
Question 11
Which substrate is used in the fermentation of citric acid?
A. Beet molasses
B. Sucrose
C. Starch hydrolysate
D. All of the above
Question 12
Alegar is a type of vinegar produced from
A. fruit juices
B. malted grain
C. ethanol
D. ale
Question 13
During recovery step of citric acid, calcium citrate formed is treated with which of the following acid to precipitate calcium?
A. HCl
B. HNO3
C. H2SO4
D. None of the above
Question 14
Vinegar production consists of
A. aerobic fermentation
B. anaerobic fermentation
C. aerobic fermentation followed by anaerobic fermentation
D. anaerobic fermentation followed by aerobic fermentation
Question 15
Cider vinegar is produced from
A. fruit juices
B. malted grain
C. ethanol
D. ale
Question 16
Ethanol is oxidized to acetic acid aerobically using
A. Acetobacter
B. Gluconobacter
C. Both A and B
D. Lactobacillus
Question 17
Malt vinegar is produced from
A. fruit juices
B. malted grain
C. ethanol
D. ale
Question 18
During recovery step of citric acid, calcium citrate formed is treated with which of the following acid to precipitate calcium?
A. HCl
B. HNO3
C. H2SO4
D. None of these
Question 19
Ethanol is oxidized to acetic acid aerobically using
A. Acetobacter
B. Gluconobacter
C. both (a) and (b)
D. Lactobacillus
Question 20
In koji process for the fermentation to produce citric acid,
A. A. niger is used with solid substrate as sweet potato
B. A. niger floats on the surface of solution
C. Fungal mycelium grows through out the solution in a deep tank
D. both (a) and (b)
Question 21
In liquid surface culture process for the fermentation to produce citric acid,
A. A. niger is used with solid substrate as sweet potato
B. A. niger floats on the surface of solution
C. Fungal mycelium grows through out the solution in a deep tank
D. both (a) and (b)
Question 22
In submerged process for the fermentation to produce citric acid,
A. A. niger is used with solid substrate as sweet potato
B. A. niger floats on the surface of solution
C. Fungal mycelium grows through out the solution in a deep tank
D. both (a) and (b)
Question 23
Which of the following nitrogen sources is added in the fermentation medium of citric acid production?
A. Ammonium salt
B. Urea
C. Both (a) and (b)
D. Peptone
Question 24
Which substrate is used in the fermentation of citric acid?
A. Beet molasses
B. Sucrose
C. Starch hydrolysate
D. All of these