MCQOPTIONS
Saved Bookmarks
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.
| 1. |
Traveller's diarrhea is caused by |
| A. | enteropathogenic Escherichia coli (EPEC) |
| B. | entero invasive E. coli (EIEC) |
| C. | entero toxigenic E. coli (ETEC) |
| D. | entero haemorrhagic E. coli (EHEC) |
| Answer» D. entero haemorrhagic E. coli (EHEC) | |
| 2. |
Which of the following species of Clostridium is responsible for the formation of dark green to black colors in cheese? |
| A. | Clostridium tyrobutyricum |
| B. | Clostridium sporogenes |
| C. | Clostridium herbarum |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 3. |
Cheese cancer of Swiss and similar cheese is caused by? |
| A. | Oospora Crustacea |
| B. | Oospora caseovorans |
| C. | Oospora aurianticum |
| D. | S. cremoris |
| Answer» C. Oospora aurianticum | |
| 4. |
The yoghurt is made from ________ |
| A. | Lactobacillus bulgaricus |
| B. | Streptococcus thermophilus |
| C. | S. cremoris |
| D. | Mixed culture of Lactobacillus bulgaricus and Streptococcus thermophilus |
| Answer» E. | |
| 5. |
Non bacterial ropiness or sliminess in milk and milk products may be due which of the following reasons? |
| A. | Stringiness due to mastitis and in particular by fibrin and leucocytes from the cow’s blood |
| B. | Sliminess resulting from the thickness of the cream |
| C. | Stringiness due to thin films of casein or lactalbumin during cooling |
| D. | Cleanliness |
| Answer» E. | |
| 6. |
Which bacteria are also known as “The cheese destroyer”? |
| A. | Propionic acid bacteria |
| B. | Coliform |
| C. | Lactic acid bacteria |
| D. | Butyric acid bacteria |
| Answer» E. | |
| 7. |
Presence of coliform in milk pipelines after pasteurization indicates __________ |
| A. | Excessive hygiene |
| B. | Poor sanitation |
| C. | Rusting |
| D. | Coating |
| Answer» C. Rusting | |
| 8. |
Milk secreted in the udder is virtually sterile. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
Transfer of plasmids from one cell to another can also be done conjugation. The plasmid to be transferred known as ______ is often unable to do so by itself and thus it relies on other plasmids known as ______ |
| A. | cargo, conjugal |
| B. | conjugal, cargo |
| C. | cargo, helper |
| D. | conjugal, helper |
| Answer» B. conjugal, cargo | |
| 10. |
Natural transformation can be relieved by the use of protoplasts, in the presence of osmotic buffer and polyethylene glycol. What are protoplasts? |
| A. | Protoplasts are the cells from which cell membrane has been removed |
| B. | Protoplasts are the cells from which cell wall has been removed |
| C. | Protoplasts are the cells from which vacuole has been removed |
| D. | Protoplasts are the cells from which golgi bodies are removed |
| Answer» C. Protoplasts are the cells from which vacuole has been removed | |
| 11. |
Competence is determined by the excretion into growth medium of _______ & _________ proteins called as competence proteins. |
| A. | cellular & high molecular weight |
| B. | cellular & low molecular weight |
| C. | extracellular & low molecular weight |
| D. | extracellular & high molecular weight |
| Answer» D. extracellular & high molecular weight | |
| 12. |
Gram-positive Bacillus, Streptococcus and Streptomyces include species that don’t exhibit natural competence. |
| A. | True |
| B. | False |
| Answer» C. | |
| 13. |
If a plasmid can’t be transferred from one cell to another, then it is called as ___________ |
| A. | non-transmissible |
| B. | non-mobilizable |
| C. | untransferrable |
| D. | immobilized |
| Answer» C. untransferrable | |
| 14. |
If plasmids direct their own transfer from one bacterium cell to another, then they are called as ___________ |
| A. | self-transmissible |
| B. | auto-transmissible |
| C. | autonomously replicating |
| D. | auto-transfer |
| Answer» B. auto-transmissible | |
| 15. |
E.coli is a gram negative bacterium. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 16. |
An organism containing a gene which doesn’t belong to it and is derived from somewhere else then the organism is said to be ___________ |
| A. | transformed |
| B. | transgenic |
| C. | mutant |
| D. | modified |
| Answer» C. mutant | |
| 17. |
Which of the following Staphylococcal haemolysins does not possess leucocidal activity? |
| A. | α haemolysin |
| B. | γ haemolysin |
| C. | β haemolysin |
| D. | δ haemolysin |
| Answer» D. δ haemolysin | |
| 18. |
An organism has an optimal growth rate when the hydrogen ion concentration is very high. This organism is |
| A. | osmotolerant |
| B. | acidophile |
| C. | neutrophile |
| D. | aerotolerant anaerobe |
| Answer» C. neutrophile | |
| 19. |
Slime capsule often covers the |
| A. | bacterium |
| B. | virus |
| C. | fungi |
| D. | all of above |
| Answer» B. virus | |
| 20. |
Lactobacilli grow best under |
| A. | strict anaerobic conditions |
| B. | microaerophilic conditions in presence of 5% CO2 and PH6 |
| C. | microaerophilic conditions in presence of 3% CO2 and PH5 |
| D. | microaerophilic conditions in presence of 2% CO2 and PH4 |
| Answer» C. microaerophilic conditions in presence of 3% CO2 and PH5 | |
| 21. |
Types of exotoxin, most commonly associated with botulism in man, is/are? |
| A. | Type A |
| B. | Type B |
| C. | Type E |
| D. | All of these |
| Answer» E. | |
| 22. |
In 'binary fission' parent cell divides to form |
| A. | 2 progeny cells |
| B. | 4 progeny cells |
| C. | 8 progeny cells |
| D. | 16 progeny cell |
| Answer» B. 4 progeny cells | |
| 23. |
The cell walls of Corynebacterium contain mycolic acid containing ______________ carbon atoms. |
| A. | 2 to 3 |
| B. | 100 to 150 |
| C. | 32 to 36 |
| D. | 20 to 25 |
| Answer» D. 20 to 25 | |
| 24. |
Agglutination test for Brucella mainly identifies which class of antibodies? |
| A. | IgG |
| B. | IgM |
| C. | IgA |
| D. | IgE |
| Answer» C. IgA | |
| 25. |
Bacteria are |
| A. | saprophytic |
| B. | symbiotic |
| C. | hyper parasitic |
| D. | all of these |
| Answer» B. symbiotic | |
| 26. |
The generation time of a culture that produces two generations per hour is |
| A. | greater than that produces three generations per hour |
| B. | lesser than that produces three generations per hour |
| C. | equal to that produces three generations per hour |
| D. | none of the above |
| Answer» B. lesser than that produces three generations per hour | |
| 27. |
What are the extrinsic factors for the microbial growth? |
| A. | humidity |
| B. | storage temperature |
| C. | composition of gas phase |
| D. | all of these |
| Answer» E. | |
| 28. |
Colonies resembling molar teeth are produced by |
| A. | Nocardia brasiliensis |
| B. | N. asteroids |
| C. | Actinomyces israelii |
| D. | Actinomadura madurae |
| Answer» D. Actinomadura madurae | |
| 29. |
In viruses with envelopes |
| A. | the envelope and the embedded proteins are encoded by the viral nucleic acid |
| B. | the envelope is derived from the host but it contains embedded proteins coded by the viral nucleic acid |
| C. | the envelope is coded by the viral nucleic acids, but the proteins come from the host's membrane proteins |
| D. | the envelope and its imbedded proteins are derived from the host's membranes |
| Answer» C. the envelope is coded by the viral nucleic acids, but the proteins come from the host's membrane proteins | |
| 30. |
Which of the following genus of species play an active role in the decomposition of urea? |
| A. | Bacillus |
| B. | Sporosarcina |
| C. | Clostridium |
| D. | Desulfotomaculum |
| Answer» C. Clostridium | |
| 31. |
Volutin granules stain which colour with dilute methylene blue? |
| A. | Violet |
| B. | Blue |
| C. | Red |
| D. | Reddish purple |
| Answer» E. | |
| 32. |
Protein A is found in cell wall of |
| A. | coagulase-negative staphylococci |
| B. | Staphylococcus aureus |
| C. | Micrococci |
| D. | none of these |
| Answer» C. Micrococci | |
| 33. |
Lyticum flagellatum is an endosymbiont carried by certain strains of __________________ |
| A. | bacteria |
| B. | fungi |
| C. | viruses |
| D. | protozoa |
| Answer» E. | |
| 34. |
Chitin is a form of |
| A. | complex peptone |
| B. | complex DNA |
| C. | complex plasmids |
| D. | complex carbohydrates |
| Answer» E. | |
| 35. |
The cocci belonging to the family Dienococcaceae occur mainly in _______________ |
| A. | tetrads |
| B. | diplococci |
| C. | streptococci |
| D. | staphylococci |
| Answer» B. diplococci | |
| 36. |
Which of the following does not cause wound infection following exposure to sea water or infected shellfish? |
| A. | Vibrio vulnificus |
| B. | V. alginolyticus |
| C. | V. cholerae |
| D. | Aeromonas |
| Answer» D. Aeromonas | |
| 37. |
The growth is normally expressed as __________ in turbidimetric measurement |
| A. | cells per ml |
| B. | cfu/ml |
| C. | optical density |
| D. | mg N2 /ml |
| Answer» D. mg N2 /ml | |
| 38. |
The organisms that can be acid-fast stained is |
| A. | Nocardia |
| B. | Tubercle bacilli |
| C. | Lepra bacilli |
| D. | all of these |
| Answer» E. | |
| 39. |
Gram staining was developed accidentally in 1884 by |
| A. | Alexander Fleming |
| B. | Hans Christian Gram |
| C. | Joseph Christian Gram |
| D. | Robert Gram |
| Answer» C. Joseph Christian Gram | |
| 40. |
During exponential growth, the growth rate is |
| A. | number of generations per unit time |
| B. | reciprocal of generation time |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» C. both (a) and (b) | |
| 41. |
Members of the genus Mycobacterium are |
| A. | gram-positive |
| B. | acid-fast |
| C. | non-motile |
| D. | all of these |
| Answer» E. | |
| 42. |
Saprophytic bacteria feeds on |
| A. | intestines of animals |
| B. | by producing their own food |
| C. | decaying organic matter |
| D. | decaying inorganic substances |
| Answer» D. decaying inorganic substances | |
| 43. |
Crystal violet blood agar is a selective medium for |
| A. | β-haemolytic streptococci |
| B. | Staphylococcus aureus |
| C. | Corynebacterium diphtheriae |
| D. | Mycobacterium tuberculosis |
| Answer» B. Staphylococcus aureus | |
| 44. |
The deinococci are gram-positive cocci and rods that are distinctive in their unusually great resistance to |
| A. | radiation |
| B. | desiccation |
| C. | both (a) and (b) |
| D. | extreme temperatures |
| Answer» D. extreme temperatures | |
| 45. |
Mycobacteria are acid-fast organisms. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» B. False | |
| 46. |
Acute diarrhoeal disease resembling cholera can be caused due to |
| A. | Aeromonas hydrophila |
| B. | Vibrio vulnificus |
| C. | V. alginolyticus |
| D. | All of these |
| Answer» B. Vibrio vulnificus | |
| 47. |
The transport medium for Vibrio cholerae can be |
| A. | Venkatraman-Ramakrishnan medium |
| B. | Selenite F broth |
| C. | Tetrathionate broth |
| D. | Nutrient broth |
| Answer» B. Selenite F broth | |
| 48. |
Which of the following Nonspore forming Gram-positive rods show negative result for catalase test? |
| A. | Lactobacillus |
| B. | Kurthia |
| C. | Brocothrix |
| D. | Renibacterium |
| Answer» B. Kurthia | |
| 49. |
What is the order of reagents used in the Gram stain? |
| A. | Crystal violet, iodine, safranin, decolorizer |
| B. | Crystal violet, iodine, decolorizer, safranin |
| C. | Safranin, crystal violet, decolorizer, iodine |
| D. | Crystal violet, safranin, iodine, decolorizer |
| Answer» C. Safranin, crystal violet, decolorizer, iodine | |
| 50. |
At what concentration of sulphuric acid, Nocardia resists decolourization? |
| A. | 0.5% sulphuric acid |
| B. | 5% sulphuric acid |
| C. | 10% sulphuric acid |
| D. | 8% sulphuric acid |
| Answer» B. 5% sulphuric acid | |