McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Bachelor of Agriculture (BSc agri) .
Chapters
| 1. |
The medium used in membrane filter technique was |
| A. | EMB agar |
| B. | EMR-Vp medium |
| C. | Lactose broth |
| D. | Endo agar |
| Answer» B. EMR-Vp medium | |
| 2. |
Lysol is a |
| A. | Sterilent |
| B. | Disinfectant |
| C. | Antiseptic |
| D. | Antifungal agent |
| Answer» B. Disinfectant | |
| 3. |
Which of the following is a neutral stain? |
| A. | Picric acid |
| B. | Gmiemsa |
| C. | Neutral red |
| D. | Malachite green |
| Answer» C. Neutral red | |
| 4. |
Peptone water medium is an example for |
| A. | Synthetic medium |
| B. | Semisynthetic medium |
| C. | Differential medium |
| D. | None of these |
| Answer» B. Semisynthetic medium | |
| 5. |
The method in which the cells are frozen dehydrated is called |
| A. | Pasteurization |
| B. | Dessication |
| C. | Disinfection |
| D. | Lypophilization |
| Answer» D. Lypophilization | |
| 6. |
The techn ique used to avo id all microorganisms is accomplished by |
| A. | Sterlization |
| B. | Disinfection |
| C. | Surgical sterilization |
| D. | Disinfection Sterilization |
| Answer» A. Sterlization | |
| 7. |
Thermal death time is |
| A. | Time required to kill all cells at a given temperature |
| B. | Temperature that kills all cells in a given time |
| C. | Time and temperature needed to kill all cells |
| D. | All of the above |
| Answer» B. Temperature that kills all cells in a given time | |
| 8. |
A culture medium the exact composition of which is not known was called as |
| A. | Simple |
| B. | Complex |
| C. | Defined |
| D. | Natural |
| Answer» A. Simple | |
| 9. |
Elek’s gel diffusion test is used for the detection of |
| A. | Tetani toxin |
| B. | Cholera toxin |
| C. | Diophtheria toxin |
| D. | Toxoid |
| Answer» C. Diophtheria toxin | |
| 10. |
Temperature required for pasteurization is |
| A. | Above 150oC |
| B. | Below 100oC |
| C. | 110oC |
| D. | None of these |
| Answer» B. Below 100oC | |
| 11. |
Separation of a single bacterial colony is calle |
| A. | Isolation |
| B. | Separation |
| C. | Pure culturing |
| D. | All of these |
| Answer» A. Isolation | |
| 12. |
Wh ich of the fo l low ing is ion iz ing radiation? |
| A. | U.V. ray |
| B. | IR |
| C. | γ-rays |
| D. | None of these |
| Answer» C. γ-rays | |
| 13. |
Wh ich of the fo l low ing induces dimerisation of thymine? |
| A. | X-ray |
| B. | U.V. rays |
| C. | ã-rays |
| D. | None of these |
| Answer» B. U.V. rays | |
| 14. |
When food material are preserved at a temperature just above freezing temperature, the process is called. |
| A. | Freezing |
| B. | Pasteurisation |
| C. | Chilling |
| D. | Frosting |
| Answer» C. Chilling | |
| 15. |
Wh ich of the fo l low ing method of sterilization has no effect on spores? |
| A. | Drying |
| B. | Hot air oven |
| C. | Autoclave |
| D. | None of these |
| Answer» A. Drying | |
| 16. |
Treponema pa l l idum can be best indentified using |
| A. | Fluorescence microscope |
| B. | Bright field microscope |
| C. | Dark field microscope |
| D. | Flourescence microscope |
| Answer» C. Dark field microscope | |
| 17. |
Autoclaving is carried at |
| A. | Dry heat |
| B. | Atmospheric pressure |
| C. | 120oC |
| D. | All of these |
| Answer» C. 120oC | |
| 18. |
Temperature in pasteurization is |
| A. | 62.8oC |
| B. | 35.7o |
| C. | 68.2oC |
| D. | 60.8oC |
| Answer» A. 62.8oC | |
| 19. |
The bacterial culture prepared by pure culture method is |
| A. | Inoculum |
| B. | Suspension |
| C. | Dilution |
| D. | None of these |
| Answer» A. Inoculum | |
| 20. |
Algae are rich in |
| A. | Carbohydrate |
| B. | Proteins |
| C. | Vitamins |
| D. | All of these |
| Answer» D. All of these | |
| 21. |
L-Lysine is produced from |
| A. | Corynebacterium glutamicum |
| B. | Clostridium botulinum |
| C. | Mycobacterium sps |
| D. | Pseudomonas |
| Answer» A. Corynebacterium glutamicum | |
| 22. |
The orderly increase in the quantity of all of the cellular components is known as |
| A. | Reproduction |
| B. | Growth |
| C. | Binary fission |
| D. | None of these |
| Answer» B. Growth | |
| 23. |
Theobacillus thio oxidans grow at pH |
| A. | 7.0 |
| B. | 1.0 |
| C. | 6.0 |
| D. | 9.5 |
| Answer» B. 1.0 | |
| 24. |
Slow freezing requires the conditions |
| A. | 0oC to 15oC for 15 min. |
| B. | – 6 oC to – 10oC for 10 min. |
| C. | – 15oC to 3 to 72 hrs. |
| D. | None of these |
| Answer» C. – 15oC to 3 to 72 hrs. | |
| 25. |
Discontinuous heating is called |
| A. | Pasteurization |
| B. | Sterilization |
| C. | Fermentation |
| D. | Tindalisation |
| Answer» D. Tindalisation | |
| 26. |
Isolation is |
| A. | Purification of culture |
| B. | Introduction of inoculum |
| C. | Separation of a single colony |
| D. | To grow microorganisms on surfaces |
| Answer» C. Separation of a single colony | |
| 27. |
The condition required for autoclave |
| A. | 121oC temp.and 15 lbs. pressure for 20 min. |
| B. | 120oC temp.and 20 lbs. pressure for 30 min |
| C. | 150oC temp.for 1 hr. |
| D. | 130oC temp for 2 hr. |
| Answer» C. 150oC temp.for 1 hr. | |
| 28. |
Lysozyme is effective against |
| A. | Gram negative bacteria |
| B. | Gram positive bacteria |
| C. | Protozoa |
| D. | Helminthes |
| Answer» B. Gram positive bacteria | |
| 29. |
Blood agar medium is |
| A. | Enrichment medium |
| B. | Enriched medium |
| C. | Selective medium |
| D. | Differential medium |
| Answer» B. Enriched medium | |
| 30. |
Infrared radiation is a method of sterilization by |
| A. | Dry heat |
| B. | Moist heat |
| C. | Chemical method |
| D. | Mechanical method |
| Answer» D. Mechanical method | |
| 31. |
Lyophilization means |
| A. | Sterilization |
| B. | Freeze-drying |
| C. | Burning to ashes |
| D. | Exposure to formation |
| Answer» B. Freeze-drying | |
| 32. |
Temperature used for hot air oven is |
| A. | 100oC for 1 hour |
| B. | 120oC for 1 hour |
| C. | 160oC for 1 hour |
| D. | 60oC for 1 hour |
| Answer» C. 160oC for 1 hour | |
| 33. |
Phenol co-efficient indicates |
| A. | Efficiency of a disinfectant |
| B. | Dilution of a disinfectant |
| C. | Purity of a disinfectant |
| D. | Quantity of a disinfectant |
| Answer» A. Efficiency of a disinfectant | |
| 34. |
This is an agar plate method and is commonly used for estimation of the number of bacteria in milk. |
| A. | Standard Plate Count (SPC) |
| B. | Spread plate |
| C. | Lawn culture |
| D. | Roll tube method |
| Answer» A. Standard Plate Count (SPC) | |
| 35. |
Agar is obtained form |
| A. | Brown algae |
| B. | Red algae |
| C. | Green algae |
| D. | Blue-green algae |
| Answer» B. Red algae | |
| 36. |
A gram positive organism which produces swarming on culture medium is |
| A. | Salmonella |
| B. | Clostridium |
| C. | Staphylococci |
| D. | Proteus |
| Answer» D. Proteus | |
| 37. |
Enhancement of virulence in bacteria is known as |
| A. | Pathogenicity |
| B. | Attenuation |
| C. | Exaltation |
| D. | Toxigenicity |
| Answer» C. Exaltation | |
| 38. |
For effective sterilization in an autoclave the temperature obtained is |
| A. | 50oC |
| B. | 100oC |
| C. | 120oC |
| D. | 180oC |
| Answer» C. 120oC | |
| 39. |
Spores are killed by |
| A. | 70% alcohol |
| B. | Glutaraldehyde |
| C. | Autoclaving |
| D. | Both b and c |
| Answer» D. Both b and c | |
| 40. |
Glassware are sterilized by |
| A. | Autoclaving |
| B. | Hot air over |
| C. | Incineration |
| D. | None of these |
| Answer» B. Hot air over | |
| 41. |
Tyndallisation was proposed by |
| A. | Tyndall |
| B. | Pasteur |
| C. | Koch |
| D. | Jenner |
| Answer» A. Tyndall | |
| 42. |
Viruses can be cultivated in |
| A. | Lab media |
| B. | Broth |
| C. | Living cells |
| D. | None of these |
| Answer» C. Living cells | |
| 43. |
By pasteurization |
| A. | All the microorganisms can be removed |
| B. | Only pathogenic forms can be removed |
| C. | Only non-pathogenic forms can be removed |
| D. | All of these are correct |
| Answer» B. Only pathogenic forms can be removed | |
| 44. |
The temperature required for pasteurization is |
| A. | Above 100oC |
| B. | Below 100oC |
| C. | 100oC |
| D. | None of these |
| Answer» B. Below 100oC | |
| 45. |
In the medium other than nutrients, if any substance is used in excess, that medium is |
| A. | Enriched medium |
| B. | Special medium |
| C. | Enrichment medium |
| D. | None of these |
| Answer» A. Enriched medium | |
| 46. |
Example for indicator medium is |
| A. | Nutrient Agar |
| B. | Nutrient broth |
| C. | Wilson and Blair |
| D. | Czapeck-dox medium |
| Answer» C. Wilson and Blair | |
| 47. |
Example of Anaerobic medium is |
| A. | Robertson cooked-meat medium |
| B. | Nutrient agar |
| C. | Nutrient broth |
| D. | Mac-Conkey’s agar |
| Answer» A. Robertson cooked-meat medium | |
| 48. |
The differentiate lactose and non-lactose fermentors, the medium used is |
| A. | Wilson & lair |
| B. | Blood Agar |
| C. | Tetra thionate broth |
| D. | Mac-Conkey’s Agar |
| Answer» D. Mac-Conkey’s Agar | |
| 49. |
Best method for getting pure culture is |
| A. | Streak-plate |
| B. | Agar slant |
| C. | Both a & b |
| D. | None of these |
| Answer» C. Both a & b | |
| 50. |
To transfer cultures from one place to another, the device used is |
| A. | Slant |
| B. | Needle |
| C. | Inoculation loop |
| D. | Autoclave |
| Answer» B. Needle | |
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