1. Signs of typhoid fever is / areHaemorrhageAll of the aboveOsteomyelitisPerforationQuestion 1 of 20 2. Septic arthritis is caused byE. coliS. aureusPseudomonasChlamydiaQuestion 2 of 20 3. Group A streptococci is best diagnosed by -Catalase negativeOptochin sensitivityBile solubilityBacitracin sensitivityQuestion 3 of 20 4. Not true about drug resistance mechanism?Complete removal of target is cause of resistance to vancomycinIf plasmid mediated always transferred verticallyAlteration of target in pneumococcal resistanceMost common mechanism is production of neutralizing substancesQuestion 4 of 20 5. In order for a virus to infect a host cell, it must first adsorb onto the cell surface, This process necessitatesan inhibition of the cellular secretion of interferon -Phagocytic activity by the cell.a specific binding of the virus to a cell-membrane receptor.an insertion of virally specified glycoproteins into the host-cell membraneQuestion 5 of 20 6. Which of the following is unique to gram-negative bacteria?CapsulesFlagellaEndotoxinsRibosomesQuestion 6 of 20 7. All are true about Leptospirosis except:Penicillin G is drug of choiceLatent period is 10 daysIgM is formed in 5 daysUrine and faeces are main mode of transmissionQuestion 7 of 20 8. With reference to bacteriodes fragilis, the following statements are true except:The LPS formed by Bacteriodes fragilis is structurally and functionally different from the conventional endotoxinsShock and DIC are common in bacteriodes bacterimiaBacteriodes fragilis is not uniformly sensitive to metronidazoleBacteriodes fragilis is a frequent anaerobe isolated from clinical samplesQuestion 8 of 20 9. Transfer of genetic information between DNA molecules inside a cell is calledTranspositionConjugationDuplicationTransformationQuestion 9 of 20 10. Anaerobic bacteria lacking catalase are generallymotile.sensitive to H202.able to ferment lactate.resistant to penicillin.Question 10 of 20 11. The phase of growth in which bacteria increases in size with increase in metabolic activity but no increase in number is seen inDecline phaseLog phaseLag phasePratella phaseQuestion 11 of 20 12. Aerosol spread leading to epidemics is seen in infection withLegionellaInfluenzaMycoplasmaHemophilusQuestion 12 of 20 13. Which of the following infections is not associated with congenital malformationsToxoplasmaRubellaNeisseriaCytomegalovirusQuestion 13 of 20 14. Sunlight has sterilizing effect because:Ozone is present in the environmentHeat is presentIt has long wavelengthIt has short wavelengthQuestion 14 of 20 15. Which of the following has been shown to be the most effective antimicrobial agent for reducing plaque and gingivitis long-term?Phenolic compoundsChlorhexidineQuaternary ammonium compoundsStannous fluorideQuestion 15 of 20 16. First chemical barrier encountered by microorganism for common exposed sites -SkinLactoseLysozymeAcidic pHQuestion 16 of 20 17. The antigen injected for carrying the 'Mantoux test' is composed of :Antigen of bacteriaSmall amount of bacteriaKilled bacteriaLive attenuated bacteriaQuestion 17 of 20 18. In myasthenia gravis, autoantibodies are directed against which of the following structures?Acetylcholine receptorSarcomereMyofasciaMyocyte nucleusQuestion 18 of 20 19. Blood spills in hospital are disinfected withAbsolute alcoholCetavlonSodium hypochloriteQuarternary ammonium compoundsQuestion 19 of 20 20. Hot air oven is used for sterilization of all EXCEPT:GlasswareLiquid paraffinSharp instrumentRubber tubesQuestion 20 of 20 Loading...