Questions and answers for exam Preparation

MCQs

Total Questions : 20 | Page 1 of 2 pages

Question 1. Most spoilage bacteria grow at

acidic pH
alkaline pH
neutral pH
any of the pH

Discuss Question

Answer: Option C. -> neutral pH

Question 2. Which of the following acid will have higher bacteriostatic effect at a given pH?

Acetic acid
Tartaric acid
Citric acid
Maleic acid

Discuss Question

Answer: Option A. -> Acetic acid

Question 3. The microbiological examination of coliform bacteria in foods preferably use

MacConkey broth
violet Red Bile agar
eosine Methylene blue agar
all of these

Discuss Question

Answer: Option D. -> all of these

Question 4. Water activity can act as

an intrinsic factor determining the likelihood of microbial proliferation
a processing factor
an extrinsic factor
all of the above

Discuss Question

Answer: Option D. -> all of the above

Question 5. Which of the following is not true for the thermal resistance of the bacterial cells?

Cocci are usually more resistant than rods
Higher the optimal and maximal temperatures for growth, higher the resistance
Bacteria that clump considerably or form capsules are difficult to kill
Cells low in lipid content are harder to kill than other cells

Discuss Question

Answer: Option D. -> Cells low in lipid content are harder to kill than other cells

Question 6. Enumeration of microorganism refers to

either spiral plating, pour plate or spread plate of a food suspension on to a suitable selective agar, or non-selective plate, depending on the test
either spiral plating, pour plate or spread plate of a food suspension on to a suitable selective agar
non-selective plating, depending on the test
none of the above

Discuss Question

Answer: Option A. -> either spiral plating, pour plate or spread plate of a food suspension on to a suitable selective agar, or non-selective plate, depending on the test

Question 7. The different ACC's between food categories reflect the

expected level of contamination of the raw material
potential for microbial growth during storage
potential shelf life
all of the above

Discuss Question

Answer: Option D. -> all of the above

Question 8. Examination of the presence / absence of organisms refers to

incubation of a food suspension in an enrichment medium followed by inoculation on to a suitable selective medium.
incubation of a food suspension in an enrichment medium followed by inoculation on to a non-selective medium.
incubation of a food suspension in an enrichment medium
none of the above

Discuss Question

Answer: Option A. -> incubation of a food suspension in an enrichment medium followed by inoculation on to a suitable selective medium.

Question 9. Plate count of bacteria in foods generally use the plating medium consisting of