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.
| 101. |
Blackening of meat in cooked meat broth is through |
| A. | C histolyticum |
| B. | C perfringens |
| C. | C tetani |
| D. | all of these |
| Answer» B. C perfringens | |
| 102. |
Which of the following Staphylococcal haemolysins does not cause lysis of human RBCs? |
| A. | β haemolysin |
| B. | γ haemolysin |
| C. | α haemolysin |
| D. | δ haemolysin |
| Answer» D. δ haemolysin | |
| 103. |
Which of the following bacteria is associated with food poisoning due to consumption of sea fish? |
| A. | Vibrio parahaemolyticus |
| B. | V alginolyticus |
| C. | V vulnificus |
| D. | All of these |
| Answer» B. V alginolyticus | |
| 104. |
Among the following which is positive for coagulase test? |
| A. | Staphylococcus aureus |
| B. | Staphylococcus epidermidis |
| C. | Staphylococcus saprophyticus |
| D. | E.coli |
| Answer» B. Staphylococcus epidermidis | |
| 105. |
'Corynebacterium' is non spore forming rod that causes |
| A. | Diphtheria |
| B. | Pneumonia |
| C. | Syphilis |
| D. | UTI's |
| Answer» B. Pneumonia | |
| 106. |
Absence of skin and other organs is a disease caused by |
| A. | Streptococcus |
| B. | Monococcus |
| C. | Staphylococcus |
| D. | Diplococcus |
| Answer» D. Diplococcus | |
| 107. |
Area of lysis on a bacterial lawn culture produced by a phage is known as |
| A. | pock |
| B. | plaque |
| C. | pox |
| D. | all of these |
| Answer» C. pox | |
| 108. |
Which of the following organisms typically get their carbon for biosynthesis from carbon dioxide? |
| A. | Glucose-fermenting bacteria (fermentation) |
| B. | Anaerobic, glucose-respiring bacteria (anaerobic respiration) |
| C. | Aerobic, glucose-respiring bacteria (aerobic respiration) |
| D. | Ammonia-oxidizing bacteria (chemolithotrophic bacteria) |
| Answer» E. | |
| 109. |
Typical drumstick appearance of bacilli is generally seen in |
| A. | C perfringens |
| B. | C botulinum |
| C. | C tetani |
| D. | C histolyticum |
| Answer» D. C histolyticum | |
| 110. |
A culture broth tube was very turbid at the bottom of the tube but clear at the top of the tube indicating that the |
| A. | broth is sterile |
| B. | organism can tolerate oxygen |
| C. | organism cannot produce superoxide dismutase and/or catalase |
| D. | organism should be grown in an anaerobic chamber |
| Answer» D. organism should be grown in an anaerobic chamber | |
| 111. |
The bacterial sore throat is caused by |
| A. | Staphylococcus aureus |
| B. | Haemophilus spp |
| C. | Streptococcus pyogenes |
| D. | Mycoplasma pneumoniae |
| Answer» D. Mycoplasma pneumoniae | |
| 112. |
Rough and buff colonies on LJ medium are characteristic of |
| A. | M chelonei |
| B. | M bovis |
| C. | Mycobacterium tuberculosis |
| D. | M fortuitum |
| Answer» D. M fortuitum | |
| 113. |
Staphylococcal food poisoning usually manifests itself following ingestion of contaminated food after |
| A. | 2-6 hours |
| B. | 8-12 hours |
| C. | 12-18 hours |
| D. | 18-36 hours |
| Answer» B. 8-12 hours | |
| 114. |
Which of the following bacteria is sensitive to pyrazinamide? |
| A. | Mycobacterium tuberculosis |
| B. | M bovis |
| C. | M fortuitum |
| D. | None of these |
| Answer» B. M bovis | |
| 115. |
Which of the following are mesophilic saprophytes? |
| A. | B.polymyxa |
| B. | B.anthracis |
| C. | B.subtilis |
| D. | B.thuringiensis |
| Answer» D. B.thuringiensis | |
| 116. |
Which of the following genus of species occurs in human feces? |
| A. | Peptococcus |
| B. | Coprococcus |
| C. | Sarcina |
| D. | Ruminococcus |
| Answer» C. Sarcina | |
| 117. |
Which of the following test indicates the susceptibility to streptococcal pyrogenic exotoxin? |
| A. | Schick test |
| B. | Disk test |
| C. | ASO test |
| D. | Precipitation test |
| Answer» C. ASO test | |
| 118. |
In the exponential phase, the cells and cell mass |
| A. | first increases then decreases |
| B. | decreases |
| C. | are constant |
| D. | double at a constant rate |
| Answer» E. | |
| 119. |
Which of the following medium are used to differentiate the colonies of Vibrio cholerae and V parahaemolyticus? |
| A. | Alkaline bile salt |
| B. | Thiosulphate-citrate-bile-sucrose |
| C. | MacConkey |
| D. | All of the above |
| Answer» C. MacConkey | |
| 120. |
Humans become infected with Mycobacterium tuberculosis most frequently by |
| A. | inhalation |
| B. | ingestion |
| C. | contact |
| D. | inoculation |
| Answer» B. ingestion | |
| 121. |
Which of the following is a substitute for crystal violet used in gram-staining procedure? |
| A. | Methylene blue |
| B. | Bromocresol green |
| C. | Safranin |
| D. | Phenolpthalene |
| Answer» B. Bromocresol green | |
| 122. |
The toxin of Staphylococcus aureus that may result into scalded skin syndrome is |
| A. | Enterotoxin |
| B. | Leucocidin |
| C. | Epidermolytic toxin |
| D. | Haemolysin |
| Answer» D. Haemolysin | |
| 123. |
Bacteria may be |
| A. | aerobic |
| B. | anaerobic |
| C. | viral or fungal |
| D. | none of others |
| Answer» D. none of others | |
| 124. |
The combination of low levels of NaCl, NaNO3 (sodium nitrate), and slightly acid pH can prevent multiplication and toxin formation of |
| A. | Salmonella |
| B. | S. aureus |
| C. | C. botulinum |
| D. | all of these |
| Answer» E. | |
| 125. |
The organism which obtain their energy from chemicals are designated as |
| A. | prototrophs |
| B. | chemotrophs |
| C. | organotrophs |
| D. | autotrophs |
| Answer» C. organotrophs | |
| 126. |
A spore differs from an actively replicating bacterium in that the spore |
| A. | is produced during a process involving asymmetric division |
| B. | is able to withstand more extreme conditions than the replicating cell |
| C. | is metabolically inactive |
| D. | all of the above |
| Answer» E. | |
| 127. |
The straightforward method of binary fission explains how bacteria |
| A. | grow in nutrient agar |
| B. | evolve |
| C. | move |
| D. | reproduce |
| Answer» E. | |
| 128. |
Which of the following toxin resembles cholera toxin? |
| A. | Stable toxin of E. coli |
| B. | Diphtheria toxin |
| C. | Labile toxin of Escherichia coli |
| D. | Tetanus toxin |
| Answer» D. Tetanus toxin | |
| 129. |
Which of the followings can be used to differentiate between classical and El Tor biotypes of Vibrio cholerae? |
| A. | Sensitivity to Mukerjee's group IV phage |
| B. | Agglutination of fowl RBCs |
| C. | Sensitivity to polymyxin B |
| D. | All of these |
| Answer» E. | |
| 130. |
Pseudomembranous colitis is a disease of _________________ |
| A. | stomach |
| B. | wounds |
| C. | bowel |
| D. | limbs |
| Answer» D. limbs | |
| 131. |
Which of the following species of streptococci belongs to Lancefield group N? |
| A. | S.pyogenes |
| B. | S.mutans |
| C. | S.pneumoniae |
| D. | S.cremoris |
| Answer» E. | |
| 132. |
Organisms such as lactobacilli that have elaborate requirements for specific nutrients i.e. vitamins and other growth promoting substances, are generally called as |
| A. | fastidious hetrotrophs |
| B. | chemo-lithotrophs |
| C. | chemotrophs |
| D. | photo-organotrophs |
| Answer» B. chemo-lithotrophs | |
| 133. |
Eugonic growth on Lowenstein-Jensen medium is produced by |
| A. | M bovis |
| B. | Mycobacterium tuberculosis |
| C. | Both (a) and (b) |
| D. | None of the above |
| Answer» C. Both (a) and (b) | |
| 134. |
The process of Gram staining is based on the ability of bacterial cell wall |
| A. | to retain the safranin dye |
| B. | to retain the crystal violet dye during solvent treatment. |
| C. | to retain part of both dyes |
| D. | none of above |
| Answer» C. to retain part of both dyes | |
| 135. |
The bacteria, used to examine the efficacy of autoclave, is |
| A. | B polymyxa |
| B. | B brevis |
| C. | Bacillus stearothermophilus |
| D. | B megaterium |
| Answer» D. B megaterium | |
| 136. |
The total biomass of an organism will be determined by the nutrient present in the lowest concentration relative to the organism's requirements is a statement of |
| A. | Liebig's law of the minimum |
| B. | Shelford's law of tolerance |
| C. | quorum sensing |
| D. | Heisenberg's principle of uncertainty |
| Answer» B. Shelford's law of tolerance | |
| 137. |
Generation time is |
| A. | time required for the population to double |
| B. | time required for the initial adjustment |
| C. | obtained by expression t/n, where t = time interval, n = number of generation |
| D. | both (a) and (c) |
| Answer» E. | |
| 138. |
What type of colonies are formed by Mycoplasmas on agar plate? |
| A. | colourless |
| B. | coloured |
| C. | lawn formation |
| D. | fried-egg |
| Answer» E. | |
| 139. |
Catalase production is negative in which of the following? |
| A. | Streptococcus |
| B. | Salmonella |
| C. | Proteus |
| D. | Staphylococcus |
| Answer» B. Salmonella | |
| 140. |
The commonest bacterial cause of cervicofacial actinomycosis is |
| A. | A. naeslundii |
| B. | A. viscosus |
| C. | A. israelii |
| D. | A. meyeri |
| Answer» D. A. meyeri | |
| 141. |
Food poisoning strains of Clostridium perfringens belong to |
| A. | type A |
| B. | type B |
| C. | type C |
| D. | type D |
| Answer» B. type B | |
| 142. |
Human transmission of Brucellae occurs by |
| A. | ingestion of contaminated meat |
| B. | direct contact with animal tissues |
| C. | ingestion of infected milk |
| D. | all of these |
| Answer» E. | |
| 143. |
What is the primary source of food for marine life? |
| A. | Phytoplankton |
| B. | Zooplankton |
| C. | Sea weed |
| D. | Grass |
| Answer» B. Zooplankton | |
| 144. |
Organisms, using organic compounds as electron donors are called |
| A. | lithotrophs |
| B. | phototrophs |
| C. | chemotrophs |
| D. | organotrophs |
| Answer» E. | |
| 145. |
One of the first enzymes synthesized by many bacteriophage is __________ , an RNA-dependent RNA polymerase. |
| A. | RNA transcriptase |
| B. | RNA polymerase |
| C. | RNA ligase |
| D. | RNA replicase |
| Answer» E. | |
| 146. |
Which of the following is a primary stain for acid fast staining of mycobacteria? |
| A. | Crystal violet |
| B. | Carbol fuchsin |
| C. | Geimsa |
| D. | Methylene blue |
| Answer» C. Geimsa | |
| 147. |
Bacterium does not have a |
| A. | cytoplasm |
| B. | true nucleus |
| C. | protoplasm |
| D. | DNA (Deoxyribonucleic Acid) |
| Answer» C. protoplasm | |
| 148. |
Pseudomonas pseudoflava can grow as |
| A. | chemo-lithotrophs |
| B. | chemo-organotrophs |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 149. |
Lactobacilli constitute the normal flora of |
| A. | prepubertal vagina |
| B. | adult vagina |
| C. | post-menopausal vagina |
| D. | none of these |
| Answer» C. post-menopausal vagina | |
| 150. |
Antibodies to which of the following antigens of Bacillus anthracis are protective? |
| A. | Capsular polypeptide |
| B. | Somatic polysaccharide |
| C. | Anthrax toxin |
| D. | None of these |
| Answer» D. None of these | |