1. What is the name of the radiographic technique when the central ray of the cone is directly perpendicular to the object?Submentovertex technique Bisecting technique none of the aboveParalleling technique Question 1 of 20 2. If your film-based radiographs start coming out too light, it may be that the ______.Developer is too hotDeveloper needs changingFixer needs changingExposure time is too longQuestion 2 of 20 3. On a radiograph, you observe a radiolucency extending from the distal aspect of the maxillary canine to the posterior wall of the maxilla above the tuberosity. The most likely cause of this radiolucency is ____.Dentigerous cystZygomatic process of the maxillaAmeloblastomaMaxillary sinusQuestion 3 of 20 4. Which projection is best for examining zygomatic arch fractures?Reverse Towne projectionLateral cephalometric projectionWaters projectionSubmentovertex projectionQuestion 4 of 20 5. Dose equivalent is expressed in terms ofsievertquality factorcoulombsgrayQuestion 5 of 20 6. Foreshorting where the teeth appear too short is caused by:Too much vertical angulationIncorrect horizontal angulationToo little vertical angulationBeam not aimed at the center of the filmQuestion 6 of 20 7. all of the following increases radiation exposure exceptuse of gridslow KVPuse of low speed filmshigh KVPQuestion 7 of 20 8. half value layer refers tothe time taken for x ray photons to travel half of the distance from the source to the objectthe rate at which an x ray photon transfer its energy to irradiated matterthe heel effect seen when the anode is placed at an angle to the electron stream in the x ray cathode tubethe thickness of a substance required to reduce the number of x ray photons by halfQuestion 8 of 20 9. all of the following is true about the dark room safe lighting exceptGBX-2 filter is recommended as a safe lightuse of high intensity and short wavelength light(red)safe lights are mounted in work area on the wall behind the processing tanksthe safe light should be mounted at least 4 feet above the processing tankQuestion 9 of 20 10. Best view for TMJ derangements isLateral skullMRICTCone beam CTQuestion 10 of 20 11. After radiation therapy , child develop rampant caries,this is calledRadiation cariesRampant cariesSecondary cariesEarly childhood cariesQuestion 11 of 20 12. which type of radiation effect results in radiation induced thyroid cancergeneticautosomalsomaticteratogenicQuestion 12 of 20 13. Film size used to evaluate TMJ10*12 inch5*7 inch8*10 inch4*3 inchQuestion 13 of 20 14. A periapical image shows overlapped contacts. This error is caused byIncorrect horizontal angulationVertical angulation is excessiveBeam not centered over receptorVertical angulation is insufficientQuestion 14 of 20 15. Linear no- threshold dose relationship gives a direct relation between:Radiation and cancer genesisRadiation exposure and osteoclastic activityRadiation exposure and cell deathRadiation and tumor cidal actionQuestion 15 of 20 16. The function of the filament is toConvert photons into electronsRelease photonsRelease electronsConvert electrons into photonsQuestion 16 of 20 17. Elongation (the most common error) can be caused byToo little vertical angulationThe film is not parallel to the long axisThe occlusal plane is not parallel to the floorAll of the aboveQuestion 17 of 20 18. which is the best technique for detecting proximal caries in children with minimum radiation exposurepanoramic radiographybitewing with bisecting angle technique bitewing with paralleling technique bitewing with RVGQuestion 18 of 20 19. The image of the coronoid process of the mandible often appears in periapical x-rays ofThe incisor region of the mandibleThe molar region of the maxillaThe molar region of the mandibleThe incisor region of the maxillaQuestion 19 of 20 20. Advantage of CT SCAN over CBCT isFan shaped beanAll of the aboveReduced radiation doseGreater contrast resolutionQuestion 20 of 20 Loading...
