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Mcqs MBBS Exams India
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(Single Best Answer) Question 101: Salmonella typhi is the causative agent of typhiod fever. The infective dose of S. typhi is ?
A) One bacillus
B) 108-1010 bacilli
C) 102-105 bacilli
D) 1 - 10 bacilli
Answer (Select an option above to get the answer):
(Single Best Answer) Question 102: The endotoxin of the following gram-negative bacteria does not play any part in the pathogenesis of the natural disease ?
A) Escherichia coli
B) Klebsiella sp.
C) Vibrio cholerae
D) Pseudomonas aeruginosa
Answer (Select an option above to get the answer):
(Single Best Answer) Question 103: A patient presented with cough with expectoration sputum. Culture shows gram negative organisms from only charcol extract agar, the organism is ?
A) Listeria monocytogenes
B) M. catarrhalis
C) B. malli/pseudomallei
D) Legionella
Answer (Select an option above to get the answer):
(Single Best Answer) Question 104: Fungus biopsy stain is ?
A) Maner
B) Alzarian red
C) PAS
D) Polychrome methylene blue
Answer (Select an option above to get the answer):
(Single Best Answer) Question 105: Culture media, correct is ?
A) Nutrient broth is a basal media
B) When selective agent added to solid media, it becomes enrichment media
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(Single Best Answer) Question 106: A young man presents with urethral discharge which has no organism but only pus cells. Diagnosis should be done on ?
A) Thayer Martin's media
B) McCoy Cell Media
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(Single Best Answer) Question 107: A patient in ICU, on central venous line for the last one week, recieving ceftazidime and amikacin. After 7 days of antibiotics he develops a spike of fever and his blood culture is positive for gram positive cocci in chains, which are catalase negative. Following this, vancomycin was started but the culture remained positive for the same organism even after 2 weeks of therapy. The most likely organism causing infection is ?
A) Staphylococcus aureus
B) Viridans streptococci
C) Enterococcus faecalis
D) Coagulase negative staphylococcus
Answer (Select an option above to get the answer):
(Single Best Answer) Question 108: True regarding bacterioides fragilis, all except ?
A) B. fragilis is most frequent anaerobe isolated from clinical samples
B) B. fragilis is not uniformly sensitive to metronidazole
C) The lipopolysaccharide formed by B. fragilis is structurally and functionally different from the conventional endotoxin
D) Shock and disseminated intravascular coagulation are common in Bacteroides bacteremia
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(Single Best Answer) Question 109: The bacteria which acts by cAMP activation is ?
A) Vibrio cholerae
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(Single Best Answer) Question 110: alpha hemolytic streptococci URTI ?
A) Bacitracin sensitivity
B) Optochin sensitivity
C) Catalase positivity
D) Bile solubility
Answer (Select an option above to get the answer):