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MCQs

Total Questions : 212 | Page 20 of 22 pages
Question 191. Biogas production is
  1.    a temperature independent process
  2.    None of these
  3.    an oxygen dependent process
  4.    a temperature-dependent process
 Discuss Question
Answer: Option D. -> a temperature-dependent process
Question 192. A dense bacterial population caught in a tangled web of fibers sticking to a surface describes
  1.    the membrane filter technique
  2.    coagulation
  3.    a biodisc
  4.    a biofilm
 Discuss Question
Answer: Option D. -> a biofilm
Question 193. Which of the following is responsible for the corrosion problem?
  1.    Sulfur bacteria
  2.    Slime forming bacteria
  3.    All of these
  4.    Iron bacteria
 Discuss Question
Answer: Option A. -> Sulfur bacteria
Question 194. Water testing relies on the detection of certain indicator organisms known as
  1.    coliforms
  2.    bacteroids
  3.    dinoflagellates
  4.    acid-fast bacteria
 Discuss Question
Answer: Option A. -> coliforms
Question 195. The death of a river by environmental pollutants ultimately results from
  1.    the overabundance of toxic proteins
  2.    the buildup of sediment on the river bottom
  3.    the depletion of oxygen
  4.    the overpopulation of algae
 Discuss Question
Answer: Option C. -> the depletion of oxygen
Question 196. Which of the following acid will have higher bacteriostatic effect at a given pH?
  1.    Acetic acid
  2.    Tartaric acid
  3.    Maleic acid
  4.    Citric acid
 Discuss Question
Answer: Option A. -> Acetic acid
Question 197. Most spoilage bacteria grow at
  1.    neutral pH
  2.    acidic pH
  3.    alkaline pH
  4.    any of the pH
 Discuss Question
Answer: Option A. -> neutral pH
Question 198. Which of the following is not true for the thermal resistance of the bacterial cells?
  1.    Cells low in lipid content are harder to kill than other cells
  2.    Higher the optimal and maximal temperatures for growth, higher the resistance
  3.    Cocci are usually more resistant than rods
  4.    Bacteria that clump considerably or form capsules are difficult to kill
 Discuss Question
Answer: Option A. -> Cells low in lipid content are harder to kill than other cells
Question 199. Water activity can act as
  1.    an intrinsic factor determining the likelihood of microbial proliferation
  2.    a processing factor
  3.    All of these
  4.    an extrinsic factor
 Discuss Question
Answer: Option C. -> All of these
Question 200. The microbiological examination of coliform bacteria in foods preferably use
  1.    all of these
  2.    MacConkey broth
  3.    violet Red Bile agar
  4.    eosine Methylene blue agar
 Discuss Question
Answer: Option A. -> all of these

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