MCQOPTIONS
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MCQOPTIONS
This section includes 533 Mcqs, each offering curated multiple-choice questions to sharpen your Dairy Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The test(s) which can be used to differentiate anthrax bacilli from anthracoid bacilli is/are |
| A. | presence of medusa-head colony |
| B. | presence of capsule |
| C. | susceptibility to gamma phage |
| D. | all of these |
| Answer» E. | |
| 52. |
Which of the following bacteria can be typed by phage typing method? |
| A. | Staphylococcus aureus |
| B. | Salmonella typhi |
| C. | Vibrio cholerae |
| D. | All of these |
| Answer» E. | |
| 53. |
Exponential phase of growth curve of bacteria is of limited duration because of |
| A. | rise in cell density |
| B. | accumulation of toxic metabolites |
| C. | exhaustion of nutrients |
| D. | all of these |
| Answer» E. | |
| 54. |
A microbe, which grows at temperatures above 95° C is most likely to be |
| A. | an archaean |
| B. | a fungus |
| C. | a protozoan |
| D. | none of these |
| Answer» B. a fungus | |
| 55. |
Identify the bacteria which is oxidase-negative and catalase-positive? |
| A. | Staphylococcus |
| B. | Streptococcus |
| C. | Neisseria |
| D. | Pseudomonas |
| Answer» B. Streptococcus | |
| 56. |
Production of acetoin can be detected by which of the following tests? |
| A. | Citrate test |
| B. | Voges-Proskauer test |
| C. | Methyl red test |
| D. | Indole test |
| Answer» C. Methyl red test | |
| 57. |
Which of the following types of Clostridium perfringens produces alpha toxin most abundantly? |
| A. | Type A |
| B. | Type B |
| C. | Type C |
| D. | Type D |
| Answer» B. Type B | |
| 58. |
The gram-positive bacteria lack __________ structure/component? |
| A. | outer membrane |
| B. | murein |
| C. | teichoic acid |
| D. | plasma membrane |
| Answer» B. murein | |
| 59. |
The term aerotolerant anaerobe refers to an organism that |
| A. | doesn't use oxygen but can grow in the presence of oxygen |
| B. | is killed by oxygen |
| C. | requires less oxygen than is present in air |
| D. | prefers to grow without oxygen |
| Answer» B. is killed by oxygen | |
| 60. |
Which of the following has more tolerance for acidic pH (lower pH)? |
| A. | Yeast and moulds |
| B. | Bacteria |
| C. | E. coli |
| D. | None of these |
| Answer» B. Bacteria | |
| 61. |
An organism is completely dependent on atmospheric O2 for growth. This organism is |
| A. | osmotolerant |
| B. | acidophile |
| C. | facultative anaerobe |
| D. | obligate aerobe |
| Answer» E. | |
| 62. |
Which of the following is a gram-positive bacteria? |
| A. | Lactobacillus |
| B. | Staphylococci |
| C. | Streptococci |
| D. | All of these |
| Answer» E. | |
| 63. |
For brucellosis, 2 ME agglutination test is used to identify |
| A. | IgG |
| B. | IgM |
| C. | IgA |
| D. | IgE |
| Answer» B. IgM | |
| 64. |
A synergistic effect is observed when |
| A. | one organism removes an inhibitory substance for another |
| B. | one organism produces a growth factor utilized by another |
| C. | microbial alteration of pH, aw, Eh favours the growth of another |
| D. | all of the above |
| Answer» E. | |
| 65. |
The bacteria which can ferment mannitol anaerobically is |
| A. | Staphylococcus aureus |
| B. | S epidermidis |
| C. | S saprophyticus |
| D. | None of these |
| Answer» B. S epidermidis | |
| 66. |
Rod-shaped bacterium is referred to as |
| A. | cocci |
| B. | bacilli |
| C. | spirilla |
| D. | vibrio |
| Answer» C. spirilla | |
| 67. |
Minimum time for doubling of E. Coli generation is approximately |
| A. | I hour |
| B. | 30 minutes |
| C. | 40 minutes |
| D. | 20 minutes |
| Answer» E. | |
| 68. |
Which of the following is a characteristic of the genus Caryophanon? |
| A. | anaerobic species |
| B. | non-motile organism |
| C. | disk-shaped cells |
| D. | parasitic |
| Answer» D. parasitic | |
| 69. |
The bacteria involved in the production of dental caries is/are |
| A. | Streptococcus mutans |
| B. | S sanguis |
| C. | Both (a) and (b) |
| D. | Streptococcus pyogenes |
| Answer» D. Streptococcus pyogenes | |
| 70. |
False negative Mantoux test is observed in |
| A. | early tuberculosis |
| B. | Advanced tuberculosis |
| C. | Severe malnutrition |
| D. | All of these |
| Answer» E. | |
| 71. |
Generation time of Escherichia coli is |
| A. | 20 minutes |
| B. | 20 hours |
| C. | 20 days |
| D. | 200 hours |
| Answer» B. 20 hours | |
| 72. |
The current genus name of a saccharolytic group of Bacteroides is |
| A. | Porphyromonas |
| B. | Bacteroides |
| C. | Prevotella |
| D. | None of these |
| Answer» B. Bacteroides | |
| 73. |
Comma shaped bacteria are known as |
| A. | Cocci |
| B. | Bacilli |
| C. | Spirilla |
| D. | Vibrio |
| Answer» E. | |
| 74. |
The process by which phage reproduction is initiated in lysogenized culture is called |
| A. | infection |
| B. | integration |
| C. | repression |
| D. | induction |
| Answer» E. | |
| 75. |
Some organisms can use reduced inorganic compounds as electron donors and are termed as |
| A. | lithotrophs |
| B. | phototrophs |
| C. | chemotrophs |
| D. | photo-organotrophs |
| Answer» B. phototrophs | |
| 76. |
Which of the following properties are the characteristics of tetanospasmin? |
| A. | It is a heat-labile protein |
| B. | It is a neurotoxin |
| C. | It can be toxoided |
| D. | All of these |
| Answer» E. | |
| 77. |
The cell reproduction in bacteria may occur by |
| A. | binary fission |
| B. | budding |
| C. | fragmentation |
| D. | all of these |
| Answer» E. | |
| 78. |
Which of the following condition is non-suppurative sequelae of Streptococcus pyogenes infections? |
| A. | Acute rheumatic fever |
| B. | Acute glomerulonephritis |
| C. | Erythema nodosum |
| D. | All of these |
| Answer» E. | |
| 79. |
Clostridium botulinum food poisoning is due to |
| A. | invasion of bacteria in the intestine |
| B. | preformed toxin |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» C. both (a) and (b) | |
| 80. |
Which of the following conditions can be caused by Plesiomonas? |
| A. | Septicaemia |
| B. | Gastroenteritis |
| C. | Cellulites |
| D. | All of these |
| Answer» E. | |
| 81. |
Which of the following bacteria is acid-fast? |
| A. | Actinomyces |
| B. | Nocardia |
| C. | Streptomyces |
| D. | Corynebacterium |
| Answer» C. Streptomyces | |
| 82. |
A wall less, aerobic and fried egg shaped bacteria, causses pneumonia, named as |
| A. | Mycobacterium |
| B. | Mycoplasma |
| C. | Clostridium sordellii |
| D. | Treponema |
| Answer» C. Clostridium sordellii | |
| 83. |
Microaerophilic bacteria are those which require |
| A. | 21 % oxygen for growth |
| B. | low levels of oxygen for growth (lesser than O2 present in atmosphere) |
| C. | oxygen for activation of enzymes |
| D. | none of the above |
| Answer» C. oxygen for activation of enzymes | |
| 84. |
Mycobacterium 'tuberculosis' doubles their generation, in a calculated time interval of |
| A. | 20 hours |
| B. | 20 minutes |
| C. | 24 hours |
| D. | 36 hours |
| Answer» D. 36 hours | |
| 85. |
Culture of tubercle bacilli may be positive if number of bacteria in the specimen is |
| A. | as few as 1-4 per ml |
| B. | as few as 5-9 per ml |
| C. | as few as 10-100 per ml |
| D. | as few as 125-200 per ml |
| Answer» D. as few as 125-200 per ml | |
| 86. |
S.pneumoniae produces which of the following type of colonies? |
| A. | alpha-haemolytic |
| B. | beta-haemolytic |
| C. | non-haemolytic |
| D. | alpha-, beta-haemolytic |
| Answer» B. beta-haemolytic | |
| 87. |
The production of sufficient acid by fermentation of glucose leads to decrease in pH such that pH of the medium falls below 4.5. Which of the following test can detect it? |
| A. | Indole test |
| B. | Methyl red test |
| C. | Citrate utilization test |
| D. | Voges-Proskauer test |
| Answer» C. Citrate utilization test | |
| 88. |
Vibrio bacteria are a variation of |
| A. | cocci |
| B. | bacilli |
| C. | spirilla |
| D. | vibrio's |
| Answer» C. spirilla | |
| 89. |
Which of the following shows a positive urease test? |
| A. | Proteus |
| B. | Klebsiella |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» D. None of these | |
| 90. |
The fragmentation occurs in |
| A. | Streptomyces species |
| B. | Nocardia species |
| C. | Bacillus subtilis |
| D. | None of these |
| Answer» C. Bacillus subtilis | |
| 91. |
Which of the following species of Clostridium is predominantly sacchrolytic? |
| A. | C septicum |
| B. | C perfringens |
| C. | C novyi |
| D. | All of these |
| Answer» E. | |
| 92. |
Phase of bacterial growth in which bacterial parent cell does not divide but metabolic activity is vigorous, named as |
| A. | Log phase |
| B. | Lag phase |
| C. | Stationary phase |
| D. | Death phase |
| Answer» C. Stationary phase | |
| 93. |
Which capsid symmetry is exhibited by most of the phages? |
| A. | Helical |
| B. | Icosahedral |
| C. | Complex |
| D. | None of these |
| Answer» C. Complex | |
| 94. |
Which of the following inference(s) indicate(s) the ability of an organism to utilize citrate as a sole source of carbon in Simmon's citrate medium? |
| A. | Blue colour |
| B. | Appearance of growth |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» D. None of these | |
| 95. |
The bacteria which is predominant flora of the human gut is |
| A. | Escherichia coli |
| B. | Clostridium perfringens |
| C. | Bacteroides |
| D. | Actinomyces |
| Answer» C. Bacteroides | |
| 96. |
Coliform bacteria on fermentation of carbohydrates yields |
| A. | lactic acid |
| B. | acetic acid |
| C. | formic acid |
| D. | all of these |
| Answer» E. | |
| 97. |
The walls of Nocardioforms contains the sugars __________________________ |
| A. | sucrose and galactose |
| B. | fructose and galactose |
| C. | sucrose and arabinose |
| D. | arabinose and galactose |
| Answer» E. | |
| 98. |
Which of the following is predominantly proteolytic? |
| A. | C. sporogenes |
| B. | C. histolyticum |
| C. | Both (a) and (b) |
| D. | C. speticum |
| Answer» D. C. speticum | |
| 99. |
'Meningitis' is a disease of brain which is caused by |
| A. | Haemophilus influenzae |
| B. | Neisseria meningitidis |
| C. | Meningococcus |
| D. | All of above |
| Answer» E. | |
| 100. |
The microorganisms that grow best in a low-oxygen environment is called a (n) |
| A. | aerobe |
| B. | anaerobe |
| C. | facultative |
| D. | microaerophile |
| Answer» E. | |