Top 1000+ Solved Microbiology MCQ Questions Answer
Q. The spores of th bacteria which canwithstand the moist heat effect also
a. Bacillus subtilis
b. Coxiella burnetti
c. Bacillus stearothermophilus
d. Pseudomonas
Q. 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
Q. Aldehydes, which are most powerfuldisinfectants
a. Formaldehyde
b. Acetaldehyde
c. Glutamal aldehyde
d. Both a and c
Q. Accridine dyes are more effective against
a. Gram positive
b. Gram negative
c. Mycoplasmas
d. Rickttsiae
Q. Salts of heavy metals used as disinfectants are
a. Thiomersal
b. Phenyl mercury nitrate
c. Mercurochrome
d. All of these
Q. 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
Q. The principle involved in the streak platemethod is
a. Separation
b. Streaking
c. Isolation
d. Dilution
Q. Culture media for fungi are
a. Potato dextrose agar (PDA)
b. Sabouraud’s agar
c. Czapekdox agar
d. All of the above
Q. Spores of actinomycetes are verysensitive, 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.
Q. 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
Q. A common laboratory method ofcultivating anaerobic micro-organisms is
a. Gas pack system
b. Brewer jar system
c. Pyrogallic acid over the cotton
d. None of these
Q. The micro-organisms grow at highsalinity are
a. Osmophile
b. Halophiles
c. Both a and b
d. None of these
Q. Non-lactose fermenting colonies seen onMac Conkey’s medium are
a. Salmonella typhi
b. Escherichia coli
c. Klebsiella pneumoniae
d. Shigella shigae