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Vinegar and Citric Acid MCQ Questions & Answers

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

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)

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Question 2

Vinegar production consists of

A. aerobic fermentation
B. anaerobic fermentation
C. aerobic fermentation followed by anaerobic fermentation
D. anaerobic fermentation followed by aerobic fermentation

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Question 3

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

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Question 4

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

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Question 5

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

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Question 6

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

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Question 7

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

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Question 8

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

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Question 9

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

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Question 10

Spirit vinegar is produced from

A. fruit juices
B. malted grain
C. ethanol
D. ale

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Question 11

Ethanol is oxidized to acetic acid aerobically using

A. Acetobacter
B. Gluconobacter
C. both (a) and (b)
D. Lactobacillus

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Question 12

Alegar is a type of vinegar produced from

A. fruit juices
B. malted grain
C. ethanol
D. ale

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Question 13

Ethanol is oxidized to acetic acid aerobically using

A. Acetobacter
B. Gluconobacter
C. Both A and B
D. Lactobacillus

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Question 14

Cider vinegar is produced from

A. fruit juices
B. malted grain
C. ethanol
D. ale

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Question 15

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

View Answer

Question 16

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)

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Question 17

Malt vinegar is produced from

A. fruit juices
B. malted grain
C. ethanol
D. ale

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Question 18

Which substrate is used in the fermentation of citric acid?

A. Beet molasses
B. Sucrose
C. Starch hydrolysate
D. All of these

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Question 19

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

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Question 20

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

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Question 21

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

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Question 22

Sugar content of the fermentation medium for citric acid is maintained at

A. 10-15%
B. 15-20%
C. 20-25 %
D. 25-30 %

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Question 23

Which substrate is used in the fermentation of citric acid?

A. Beet molasses
B. Sucrose
C. Starch hydrolysate
D. All of the above

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Question 24

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)

View Answer