Medical Microbiology BSc MCQs Set-2

Medical Microbiology

1. Antibiotics used for treatment of cholera are 

a. Tetracyclines 
b. Penicillins 
c. Streptomyces 
d. None of these

Answer:a. Tetracyclines 

2. Salmonella typhi is the causative organism of 

a. Undulant fever 
b. Remittent fever 
c. Dengue fever 
d. Enteric fever 

Answer:d. Enteric fever 

3. Which of the following Salmonella paratyphi is the commonest in India? 

a. A 
b. B 
c. C 
d. None of these 

Answer:a. A 

4. In enteric fever, the organ lodging maximum number of the organism is 

a. Liver 
b. Gallbladder
c. Small intestine 
d. Large intestine 

Answer:b. Gallbladder

5. True about Enteric fever is 

a. Bacteraemia in first week 
b. Carrier in 90% 
c. All serotypes cause the disease 
d. Rosy spots on 18th day 

Answer:a. Bacteraemia in first week

6. Gastroenteritis is caused by 

a. Shigella 
b. V.cholerae 
c. V.cholera Parahaemolyticus 
d. S.typhi 

Answer:c. V.cholera Parahaemolyticus

7. E.coli produces the following toxins: 

a. Enterotoxins 
b. Endotoxins 
c. Vero Cytotoxins 
d. Hemolysins 

Answer:b. Endotoxins

8. The following infections caused by Esch. Coli, except 

a. Urinary tract infections
b. Septic infections of wounds 
c. Diarrhoea 
d. Dysentery 
e. Meningitis 

Answer:e. Meningitis

9. Diphtheria is caused by 

a. Corynebacterium diphtheriae 
b. C. Bovis 
c. C. Jeikeium 
d. C. equi 

Answer:a. Corynebacterium diphtheriae

10. Causative organism of diphtheria was first demonstrated by 

a. Robert Koch 
b. Louis Pasteur 
c. Klebs and Loeffler 
d. Volhard and Fahr 

Answer:c. Klebs and Loeffler

11. Coryne bacterium is 

a. Gram positive 
b. Resistant to Penicillin 
c. Gram negative 
d. Resistant to Chloramphenicol

 Answer:a. Gram positive

12. C. diphtheriae consists of 

a. Starch granules 
b. Polymeta phosphate granules 
c. Lipid granules 
d. None of these

 Answer:b. Polymeta phosphate granules

13. The incubation period of diphtheriae is 

a. Upto 2 weeks 
b. Upto 1 week 
c. 2–4 weeks 
d. None of these

 Answer:c. 2–4 weeks

14. Diphtheria virulence test is 

a. Ascoli’s thermo precipitation test 
b. Eleks gel precipitation test 
c. C.R.P test 
d. M.R.T. test 

Answer:b. Eleks gel precipitation test 

15. Diphtheria toxoid is prepared by using 

a. Aldehyde 
b. Formalin 
c. Phenols 
d. None of these 

Answer:b. Formalin

16. Diphtheria is an example of 

a. Bacteraemia 
b. Pyaemia 
c. Septicemia 
d. Toxaemia 

Answer:d. Toxaemia

17. Main symptom of tuberculosis is 

a. Tubercle formation 
b. Liquid formation 
c. Both a and b 
d. None of these 

Answer:a. Tubercle formation

18. BCG vaccine is for the prevention of 

a. Brucellosis 
b. Diphtheria 
c. Botulism 
d. Tuberculosis 

Answer:d. Tuberculosis

19. Dose of BCG vaccine is 

a. 0.2–0.5 ml 
b. 0.1 ml 
c. 0.05 ml 
d. 0.2 to 0.3 ml

Answer:b. 0.1 ml

20. Negative Mantoux test is important in 

a. Pulmonary Koch’s syndrome 
b. Sarcoidosis 
c. Carcinoma bronchus 
d. Lymphoma

Answer:a. Pulmonary Koch’s syndrome

21. Bacillus Calmette Guerin (BCG) contains the avirulent strains of 

a. Human tubercle bacilli 
b. Avian tubercle bacilli 
c. Bovine tubercle bacilli 
d. A typical mycobacteria 

Answer:c. Bovine tubercle bacilli

22. Drugs used against tuberculosis (TB) are 

a. Rifampicin, Isoniazid 
b. Pyrazinamide, Streptomycin 
c. Both a and b 
d. None of these 

Answer:c. Both a and b

23. The greatest number of tubercle bacilli is present in 

a. Large sized tuberculomas 
b. Military tuberculosis 
c. Tuberculous lymphadenitis 
d. Tuberculous cavity of the lung 

Answer:d. Tuberculous cavity of the lung

24. Histoid Hansen is a veriety of 

a. Tuberculoid Leprosy 
b. Borderline tuberculoid 
c. Borderline lepromatous 
d. Lepromatous leprosy 

Answer:d. Lepromatous leprosy

25. Streptococcus pyogenes produces all of the following lesions, except 

a. Impetigo contagiosa 
b. Erysipelas 
c. Boil 
d. Paronychia 

Answer:d. Paronychia

26. Causative agent of Scarlet fever: 

a. Staphylococcus aureus 
b. Streptococcus viridans 
c. Stre. pyogenes 
d. None of these 

Answer:c. Stre. pyogenes 

27. Rheumatic fever is most commonly caused by 

a. Str. viridans 
b. Str. pyogenes 
c. Stph. aures 
d. None of these 

Answer:b. Str. pyogenes

28. Penicillin is the drug of choice for 

a. Scarlet fever 
b. Whooping cough 
c. Brucellosis 
d. Cholera 

Answer:a. Scarlet fever

29. In human beings str. pneumoniae causes 

a. Septicaemia 
b. Paronychia 
c. Pneumonia 
d. None of these 

Answer:c. Pneumonia

30. Virulence factor for Stre. pneumoniae: 

a. Capsular polysaccharide 
b. Specific soluble substance
c. Vi-antigen 
d. Forssman antigen 

Answer:a. Capsular polysaccharide

31. Conjunctivitis in a newborn is caused by 

a. Streptococcus 
b. Pneumococcus 
c. Meningococci 
d. None of these 

Answer:a. Streptococcus

32. Influenza is belonging to 

a. Orthomyxoviridae
b. Retroviridae 
c. Both a and b 
d. None of these 

Answer:a. Orthomyxoviridae

33. Influenza virus contains 

a. Eight segments of RNA 
b. Two strands of RNA 
c. Single RNA 
d. None of these 

Answer:b. Two strands of RNA 

34. ‘Reye’s syndrome’ is caused by 

a. St.pneumoniae 
b. St.pyogenes 
c. Influenza 
d. None of these 

Answer:c. Influenza

35. German measles is also known as 

a. Rubella / 2-day measles 
b. Rubella / 3day measles 
c. Rubella / 4-day measles 
d. Rubella / 1-day measles

Answer:b. Rubella / 3day measles

36. The commonest cause of rubella in newborns 

a. Congenital rubella 
b. Postnatal rubella 
c. Expanded rubella syndrome (ERS) 
d. Both a and c 

Answer:d. Both a and c

37. Mumps virus is going to go 

a. Retroviridae 
b. Paramyxoviridae 
c. Orthomyxo viridae 
d. None of these 

Answer:b. Paramyxoviridae

38. Measles is characterized by 

a. Negri Bodies 
b. Babes-Ernst granules 
c. Koplik’s spots 
d. Fever  

Answer:b. Babes-Ernst granules 

39. Brucella causes 

a. Pertusis 
b. Plague 
c. Brucellosis 
d. None of these 

Answer:c. Brucellosis

30. Mediterranian fever is caused by 

a. M. tuberculosis 
b. S. typhi 
c. C.neoformans 
d. Brucella 

Answer:d. Brucella 

41. Which of the following test is specific for Brucellosis? 

a. Frei 
b. Weil
c. Castaneda strip 
d. Rose water

Answer:c. Castaneda strip 

42. Malignant pustule is caused by 

a. Anthrax 
b. Tetanus 
c. Diphtheria 
d. None of these 

Answer:a. Anthrax 

43. The commonest form of anthrax in man is 

a. Alimentary 
b. Cutaneous 
c. Pulmonary 
d. Hepatic 

Answer:b. Cutaneous

44. The animals most frequently infected with anthrax are 

a. Sheep 
b. Cattle 
c. Goats 
d. All of these 

Answer:d. All of these

45. Virus causing Rabies is 

a. Orthomyxovirus 
b. Paramyxovirus 
c. Rhabdovirus 
d. Toga viruses 

Answer:c. Rhabdovirus

46. Rhabdo viruses belong to the family: 

a. Rhabdo viridae 
b. Toga viridae 
c. Paramyxo viridae 
d. None of these 

Answer:a. Rhabdo viridae

47. Rabies Virus isolated from natural human or animal infection is termed as 

a. Street virus 
b. Fixed virus 
c. Both a and b 
d. None of these

 Answer:a. Street virus

48. Rabies virus can multiply in 

a. The central nervous system only 
b. The peripheral nerves 
c. Muscle tissues 
d. All the above 

Answer:d. All the above 

49. Neurological complications following rabies vaccines is common with 

a. Chick embryo vaccine 
b. HDCS vaccine 
c. Semple vaccine 
d. BPL vaccine 

Answer:c. Semple vaccine

50. Which anti rabic vaccine has been recommended by WHO as the most effective? 

a. Duck embryo vaccine 
b. HDCS vaccine 
c. Sheep brain vaccine 
d. BPL vaccine

Answer:b. HDCS vaccine