McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Bachelor of Agriculture (BSc agri) .
Chapters
| 401. |
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 | |
| 402. |
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 | |
| 403. |
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) | |
| 404. |
Agar is obtained form |
| A. | Brown algae |
| B. | Red algae |
| C. | Green algae |
| D. | Blue-green algae |
| Answer» B. Red algae | |
| 405. |
A gram positive organism which produces swarming on culture medium is |
| A. | Salmonella |
| B. | Clostridium |
| C. | Staphylococci |
| D. | Proteus |
| Answer» D. Proteus | |
| 406. |
Enhancement of virulence in bacteria is known as |
| A. | Pathogenicity |
| B. | Attenuation |
| C. | Exaltation |
| D. | Toxigenicity |
| Answer» C. Exaltation | |
| 407. |
For effective sterilization in an autoclave the temperature obtained is |
| A. | 50oC |
| B. | 100oC |
| C. | 120oC |
| D. | 180oC |
| Answer» C. 120oC | |
| 408. |
Spores are killed by |
| A. | 70% alcohol |
| B. | Glutaraldehyde |
| C. | Autoclaving |
| D. | Both b and c |
| Answer» D. Both b and c | |
| 409. |
Glassware are sterilized by |
| A. | Autoclaving |
| B. | Hot air over |
| C. | Incineration |
| D. | None of these |
| Answer» B. Hot air over | |
| 410. |
Tyndallisation was proposed by |
| A. | Tyndall |
| B. | Pasteur |
| C. | Koch |
| D. | Jenner |
| Answer» A. Tyndall | |
| 411. |
Viruses can be cultivated in |
| A. | Lab media |
| B. | Broth |
| C. | Living cells |
| D. | None of these |
| Answer» C. Living cells | |
| 412. |
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 | |
| 413. |
The temperature required for pasteurization is |
| A. | Above 100oC |
| B. | Below 100oC |
| C. | 100oC |
| D. | None of these |
| Answer» B. Below 100oC | |
| 414. |
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 | |
| 415. |
Example for indicator medium is |
| A. | Nutrient Agar |
| B. | Nutrient broth |
| C. | Wilson and Blair |
| D. | Czapeck-dox medium |
| Answer» C. Wilson and Blair | |
| 416. |
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 | |
| 417. |
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 | |
| 418. |
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 | |
| 419. |
To transfer cultures from one place to another, the device used is |
| A. | Slant |
| B. | Needle |
| C. | Inoculation loop |
| D. | Autoclave |
| Answer» B. Needle | |
| 420. |
The bacterial culture prepared by pure culture is |
| A. | Inoculum |
| B. | Suspension |
| C. | Dilution |
| D. | None of these |
| Answer» A. Inoculum | |
| 421. |
Separation of a single colony is |
| A. | Pure-culturing |
| B. | Isolation |
| C. | Separation |
| D. | Both a and b |
| Answer» B. Isolation | |
| 422. |
Growth period of the culture is |
| A. | Inoculation |
| B. | Incubation |
| C. | Incineration |
| D. | Isolation |
| Answer» B. Incubation | |
| 423. |
At the temperature 160oC for one hour, complete sterilization occurs in |
| A. | Autoclave |
| B. | Hot air oven |
| C. | Laminar flow |
| D. | Incubator |
| Answer» B. Hot air oven | |
| 424. |
In autoclave, the principle involved is |
| A. | Dry heat |
| B. | Moist heat |
| C. | Steam under pressur |
| D. | Both b and c |
| Answer» D. Both b and c | |
| 425. |
The spores of th bacteria which can withstand the moist heat effect also |
| A. | Bacillus subtilis |
| B. | Coxiella burnetti |
| C. | Bacillus stearothermophilus |
| D. | Pseudomonas |
| Answer» C. Bacillus stearothermophilus | |
| 426. |
Factors on which disinfectivity of a disinfectant depends |
| A. | Concentration of the substance |
| B. | Time of action |
| C. | pH of the medium and temperature suitable for the chemical |
| D. | All of the above |
| Answer» D. All of the above | |
| 427. |
Aldehydes, which are most powerful disinfectants |
| A. | Formaldehyde |
| B. | Acetaldehyde |
| C. | Glutamal aldehyde |
| D. | Both a and c |
| Answer» D. Both a and c | |
| 428. |
Accridine dyes are more effective against |
| A. | Gram positive |
| B. | Gram negative |
| C. | Mycoplasmas |
| D. | Rickttsiae |
| Answer» A. Gram positive | |
| 429. |
The sterilizing agent is |
| A. | Ethelene oxide |
| B. | Oxygen |
| C. | Nitrogen |
| D. | Carbon tetrachloride |
| Answer» A. Ethelene oxide | |
| 430. |
Salts of heavy metals used as disinfectants are |
| A. | Thiomersal |
| B. | Phenyl mercury nitrate |
| C. | Mercurochrome |
| D. | All of these |
| Answer» D. All of these | |
| 431. |
Cultures are prepared by penetrating the inoculation loop with suspension into the medium, they are |
| A. | Stock culture |
| B. | Stabcultures |
| C. | Sub-cultures |
| D. | None of these |
| Answer» B. Stabcultures | |
| 432. |
The principle involved in the streak plate method is |
| A. | Separation |
| B. | Streaking |
| C. | Isolation |
| D. | Dilution |
| Answer» D. Dilution | |
| 433. |
Culture media for fungi are |
| A. | Potato dextrose agar (PDA) |
| B. | Sabouraud’s agar |
| C. | Czapekdox agar |
| D. | All of the above |
| Answer» D. All of the above | |
| 434. |
Spores of actinomycetes are very sensitive, killed at room temperature of |
| A. | 52oC for 30 min. |
| B. | 65oC for 30 min. |
| C. | 70oC for 30 min. |
| D. | 43oC for 30 min. |
| Answer» B. 65oC for 30 min. | |
| 435. |
The term that is used for the bacteria which can withstand pasteurization but does not grow at higher temperatures |
| A. | Thermophiles |
| B. | Extreme thermophiles |
| C. | Thermoduric |
| D. | Facultative thermophiles |
| Answer» C. Thermoduric | |
| 436. |
A common laboratory method of cultivating anaerobic micro-organisms is |
| A. | Gas pack system |
| B. | Brewer jar system |
| C. | Pyrogallic acid over the cotton |
| D. | None of these |
| Answer» C. Pyrogallic acid over the cotton | |
| 437. |
Alkaliphiles grow at pH value between |
| A. | 1 to 6 |
| B. | 6 to 9 |
| C. | 1 to 11 |
| D. | 7 to 12 |
| Answer» D. 7 to 12 | |
| 438. |
The micro-organisms grow at high salinity are |
| A. | Osmophile |
| B. | Halophiles |
| C. | Both a and b |
| D. | None of these |
| Answer» C. Both a and b | |
| 439. |
Non-lactose fermenting colonies seen on Mac Conkey’s medium are |
| A. | Salmonella typhi |
| B. | Escherichia coli |
| C. | Klebsiella pneumoniae |
| D. | Shigella shigae |
| Answer» A. Salmonella typhi | |
| 440. |
Wilson and Blair medium is used for isolation of |
| A. | Staphylococci |
| B. | Salmonella typhosa |
| C. | Vibrio cholerae |
| D. | Shigella shigae |
| Answer» B. Salmonella typhosa | |
| 441. |
Laboratory diagnosis of enteric fever is based on |
| A. | Blood culture |
| B. | Urine and stool culture |
| C. | Widal test |
| D. | All of the above |
| Answer» D. All of the above | |
| 442. |
Shigella was first isolated by |
| A. | Shiga |
| B. | Schmitz |
| C. | Sonnei |
| D. | Robert Koch |
| Answer» C. Sonnei | |
| 443. |
Which of the following are gas producing Salmonella? |
| A. | S.typhi |
| B. | S.enteritidis |
| C. | S.cholerasuis |
| D. | S.typhimurium |
| Answer» B. S.enteritidis | |
| 444. |
Kauffmann white scheme is used to detect |
| A. | Salmonella spp. |
| B. | Shigella spp. |
| C. | E.coli |
| D. | None of these |
| Answer» A. Salmonella spp. | |
| 445. |
On Mac Conkey’s medium Esch. Coli forms |
| A. | Colorless colonies |
| B. | Greenish pigmentation |
| C. | Pink coloured colonies |
| D. | Medusa head appearance |
| Answer» C. Pink coloured colonies | |
| 446. |
C.diphtheriae requires |
| A. | LJ medium |
| B. | Mac Conkey’s medium |
| C. | Potassium tellurite medium |
| D. | PDA medium |
| Answer» C. Potassium tellurite medium | |
| 447. |
Culture medium for Mycobacterium tuberculosis |
| A. | LJ medium |
| B. | Mac Conkey’s medium |
| C. | Wilson blair medium |
| D. | None of these |
| Answer» A. LJ medium | |
| 448. |
Lepra bacillus is best cultured on |
| A. | Armadillo’s brain |
| B. | Foot pad of mice |
| C. | Liver of guinea pig |
| D. | Any of the above |
| Answer» B. Foot pad of mice | |
| 449. |
Culture medium for clostridia spp. |
| A. | 76 Lower stein Jensen’s medium |
| B. | Mac Conkey’s medium |
| C. | Robertson’s cooked meat medium |
| D. | None of these |
| Answer» C. Robertson’s cooked meat medium | |
| 450. |
Clsotridium welchii is positive for |
| A. | Elek’s gel precipitation test |
| B. | Nagler’s test |
| C. | Weil felix test |
| D. | Bacitracin test |
| Answer» B. Nagler’s test | |
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