1. Bremsstrahlung radiation results from ____.Electrons interacting with electronsL shell electrons falling into the K shellX-rays interacting with electronsElectrons interacting with tungsten nucleiQuestion 1 of 20 2. a patient sustains an injury to mandible. Which is the best projection for evaluation of the condylar neck and ramus arealateral cephSubmentovertexReverse towneWatersQuestion 2 of 20 3. digital radiography differs from conventional inradiation receptors are differentrays other than x rays are usedno hard copy is formedx rays not usedQuestion 3 of 20 4. which of the following restorative material is the most radiolucentmethylmethacrylateporcelaingutta perchazinc oxide eugenolQuestion 4 of 20 5. All of the following cells in the body are relatively resistant to damage by radiation exceptMuscle cellsMucosal cellsNerve cellsMature boneQuestion 5 of 20 6. Normal angulation for recording a periapical radiograph of a maxillary lateral incisor:70 degress-ve 30 degrees30 degrees40 degreesQuestion 6 of 20 7. Occlusal radiographs are useful for all of the following except one. Which one is the exception?For displaying large segments of the mandibular archWhen there is buccal-lingual expansion of the mandibleWhen there are sialoliths in the floor of the mouthFor views of the temporomandibular joint (TMJ)Question 7 of 20 8. Deterministic effects ____.Show a severity of response proportional to doseAre found after exposure to low levels of radiationResult from particulate radiation such as alpha and beta particles but not xraysAre seen only in the oral cavityQuestion 8 of 20 9. In dental Xray tube, the number of electrons flowing per second is measured byKVpnone of the abovetimemilliampereQuestion 9 of 20 10. Elongation (the most common error) can be caused byThe film is not parallel to the long axisAll of the aboveThe occlusal plane is not parallel to the floorToo little vertical angulationQuestion 10 of 20 11. when a child is not able to hold the IOPA who should hold the filmparentassistantdentistradiographerQuestion 11 of 20 12. Size of x-ray film for bitewing used in a child for molar tooth3214Question 12 of 20 13. Linear accelerators used in medical radiology produce which type of particlesNeutrons and protonsElectrons and photonsElectrons and neutronsPhotons and neutronsQuestion 13 of 20 14. Which of the following doesnot apply to filtration of an x-ray beam in a modern x-ray unit?Decreases the mean energy of the x-ray beamReduces patient exposure by removing lower energy photonsRequired to be 1.5 mm thick for 70 kVpProvided by an aluminum filterQuestion 14 of 20 15. Digital x-rays require less radiation than conventional x-rays because:The sensor is largerThe exposure time is increasedThe pixels sense transmitted light quicklyThe sensor is more sensitive to x-raysQuestion 15 of 20 16. gamma camera in nuclear medicine is used formonitoring the surface contaminationorgan imagingmeasuring the radioactivityRIAQuestion 16 of 20 17. What are the components of a developing solution?Clearing agent, antioxidant preservative, acidifier, hardenerDeveloping agent, accelerator, restrainerDeveloping agent, acidifier, antioxidant preservative, hardenerClearing agent restrainer, accelerator, acidifierQuestion 17 of 20 18. occlusal radiograph are useful in locatingmaxillary sinus mucocelesthe mental foramensialoliths in stensons ductsialoliths in whartons ductQuestion 18 of 20 19. Proper radiographic infection control includes all of the following except one. Which one is the exception?Disinfecting x-ray machine surfaceWearing gloves while making radiographsCovering working surfaces with barriersSterilizing film packetsQuestion 19 of 20 20. Machine A has FOV(field of view) of 6-12 inches,while machine B has FOV of 1.6 to 3.1 inches. Which CBCT machine will produce higher resolution image and deliver less radiationFOV does not matterMachine ABoth will give same resolution of imageMachine BQuestion 20 of 20 Loading...
