1. An anatomic structure which has a worm hole radiolucency is characteristic ofMandibular canalNutrient canalMaxillary sinusMental foramen 2. 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 radiationMachine AMachine BFOV does not matterBoth will give same resolution of image 3. Lamina dura, Nasal fossa and maxillary sinus appear distinct and clear in a radiograph due toMach band effectEgg shell effectPhotoelectric effectWindow effect 4. consistent radiographs requirelong cone technique fixed KVp and mAautomatic processingproper developing 5. The radiographic appearance of Botryoid odontogenic cyst isLemon peel appearanceGrape bunch appearanceOrange peel appearanceApple green appearance 6. sialogram of a normal salivary gland appears asleafy treesleafless treessialolithiasissialgectasia 7. if multiple myelpma is suspected from a patients history and IOPA, which of the following radiographs should be taken to confirm the diagnosislateral skullanterior posterior viewlateral oblique viewposterior anterior view 8. Which of the following projections is the best for evaluating the maxillary sinus?Lateral jaw projectionReverse Towne projectionWaters projectionSubmentovertex projection 9. Which of the following projections is the best for evaluating midface fractures?Lateral jaw projectionReverseTowne projectionWaters projectionSubmentovertex projection 10. Structures seen in maxillary anterior periapical radiographlateral fossaGenial tuberclesZygomatic arch/zygomatic process of maxillaMaxillary sinus 11. The period between radiation exposure and the onset of symptoms is called theLatent periodPeriod of cell injuryRecovery periodnone of the above 12. When the X-ray tube is shifted to the right, the object shifts to the left as compred to the adjacent teeth.The object is positionedLabial to the teethLingual to the teethIn the line with the teethIt has no relation to the teeth 13. In dental Xray tube, the number of electrons flowing per second is measured byKVpmilliamperetimenone of the above 14. the quantity of electrons available for x rays is determined primarily bykilovoltage settingamount of filtrationdegree of collimationmiliamperage setting 15. the density of a radiograph is reduced by increasingkilovoltagemiliamperageexposure timesource film distance 16. Oral route is used for which isotopeIodine-123Tech 99Galium 67F-18 17. What is the role of potassium bromide and benzotriazole in developerInitiatorActivatorRestrainerPreservative 18. the heel effect resultsin low intensity x ray beam on anode side of central rayin high intensity beam of x ray towards cathodeboth of them are truenone of the above are true 19. It is acceptable for the operator to hold the film in a patient's mouth____.If the patient is a childIf the patient or parent grants permissionIf the patient has a handicapNever 20. In case of suspected metastasis to lymph nodes of neck,ultrasound will reveal all of the following exceptHypoechoic shadowPresence of microcalcificationsDecreased vascularityLoss of fatty hyaline layer 21. the component of developer that gives detail to the radiographic image ishydroquinonesodium sulphatesodium carbonatepotassium bromide 22. In the body which atom is useful in magnetic resonance imaging(MRI)HydrogenOxygenNitrogenSulphur 23. radiographically,in early caries one can mistake a radiolucent line below the DEJ forhunter schreger bandslines of retziustomes granular layermach bands 24. Radiograph of a tooth shows appearance of a halo around the root.It may be indicative ofHorizontal root fractureWidening of the periodontal ligamentRoot cariesPeriapical periostitis 25. which of the following is most valuable in determining x ray beam qualityhomogeneity cofficienteffective photon energypeak kilovoltage with added filtrationspectral distribution of photon energies 26. It is generally desirable that x-ray films be all of the following exceptHigh speedFine grain sizeCoated with emulsion on both sidesSensitive to visible light 27. all of the following increases radiation exposure excepthigh KVPlow KVPuse of low speed filmsuse of grids 28. The disadvantage of digital radiography over conventional radiographyHigh costTime consumingProcessing defectsHigher radiation exposure 29. fibrous dysplasia is associated withground glass appearancesoap bubble appearancehair on end appearancesunburst appearance 30. Fogging seen in x- ray film is seen due to all of the following reasons exceptGridStray radiationsOld filmImproper safe lighting 31. Advantage of CT SCAN over CBCT isGreater contrast resolutionReduced radiation doseFan shaped beanAll of the above 32. What is the "critical target" for radiation damageGolgi apparatuschromosomesenzymeslysosomes 33. Radiographic appearance of hypophosphatasiaGhost teethFloating teethShell teethCemental thickening 34. When using a phosphor plate, if we tak eimage without deetion of previous one is calledGhost imageDouble imageSingle real imageNo image 35. in normal dental diagnostic procedures the principal radiation hazard to the operator is produced bygamma radiationprimary radiationsecondary radiationnone of the above 36. in radionucleotide imaging the most useful radio pharmaceutical for skeletal imaging isgallium 67technetium-sulphur colloidtechnetium-99mtechnetium -99m linked to methylene disphosphonate 37. Most radiosensitive phase of cell cycle isG1SG2S2 38. Occlusal radiographs are useful for all of the following except one. Which one is the exception?For views of the temporomandibular joint (TMJ)For displaying large segments of the mandibular archWhen there are sialoliths in the floor of the mouthWhen there is buccal-lingual expansion of the mandible 39. Black branching lines appear on a processed film. Which of the following is the most likely cause?fixer cutoffdeveloper cutofffingernail damagestatic electricity 40. If your film-based radiographs start coming out too light, it may be that the ______.Exposure time is too longDeveloper needs changingDeveloper is too hotFixer needs changing 41. which of the following malignant tumour is radioresistantewing's sarcomaretinoblastomaosteosarcomaneuroblastoma 42. radiographic diagnosis of dense radioopaque cotton wool areas throughout the entire body of the mandible and associated with hypercementosis is most likelyenostosisexostosisosteomyelitispaget's disease 43. Photoelectric interactions are highest in _____.EnamelDentinCementumPulp 44. Linear accelerators used in medical radiology produce which type of particlesElectrons and photonsPhotons and neutronsElectrons and neutronsNeutrons and protons 45. Which of the following is not a fibrotic effect of radiationDysphagiaXerostomiaTrismusVelopharyngeal incompetence 46. in which one of the following condition sialography is contraindicatedductal calculuschronic parotitisacute parotitisrecurrent parotitis 47. the gold standard for the diagnosis of osteoporosis isdual energy x ray absorptiometrysingle energy x ray absorptiometryultrasoundquantitative computed tomography 48. which of the following radiographic feature is commonly associated with a traumatic bone cystdivergence of the roots of teethunilocular radiolucency with focal radiooacitydome shaped radio oacity of the maxillary sinusscalloped radiolucency extending between the roots of teeth 49. All are advantages of digital radiography exceptDigital subtractionThe ability to enhance the imageSize of the intraoral sensorPatient education 50. when a child is not able to hold the IOPA who should hold the filmdentistparentassistantradiographer 51. 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 cystAmeloblastomaZygomatic process of the maxillaMaxillary sinus 52. Hurter Driffield Index is used to measureDental cariesradiographNiTi instrumentStainless steel 53. Long gray scale is achieved byDecreasing KVpIncreased voltageDecreasing tube currentIncreasing tube current 54. 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 photonsProvided by an aluminum filterRequired to be 1.5 mm thick for 70 kVp 55. What is the effect on radiograph if there are scratches on intensifying screenDark spot on radiographNo effectLight spots on radiographReticulation in the radiograph 56. SI unit of radioactivity iscuriegraybecquerelroentgen 57. Dose equivalent is expressed in terms ofcoulombsgraysievertquality factor 58. Which of the following focuses the electrons into a narrow beam and directs the beam across the tube towards tungsten target of the anodecopper stemtungsten filamentinsulating oilmolybdenum cup 59. The function of the filament is toConvert electrons into photonsConvert photons into electronsRelease photonsRelease electrons 60. the purpose of a step down transformer in an x ray apparatus is tocontrol voltage to the tube filamentcontrol potential between cathode and anodereduce unnecessary radiationreduce danger of "pitting " the focal spot on the anode 61. Maximum fogging effect is seen byCompton scatteringPhotoelectric absorptionCoherentCharacteristic radiation 62. Charge transferred across rows of detector in a 'bucket brigade ' fashion is seen inCMOSCCDFlat panel detectorPSP 63. characteristic 'tram line' calcifications in the skull radiographs is observed incleidocranial dystosessturge weber syndromepaget's diseasemaccune albright syndrome 64. Floating teeth' are seen in which of the following conditions?Cleidocranial dysplasiaHistiocytosis XEhler danlos syndromeOsteoporosis 65. What are the components of a developing solution?Clearing agent, antioxidant preservative, acidifier, hardenerDeveloping agent, acidifier, antioxidant preservative, hardenerDeveloping agent, accelerator, restrainerClearing agent restrainer, accelerator, acidifier 66. a developer at high temperature will causeclear white spots on the filmyellow stainsvery dark imagevery light image 67. A nephrocalcinosis treated patient and on omeprazole for last 3 weeks, has midline crossing lesion in the lower jaw, radiolucent, hazy trabeculae,giant cells , expanding cortical plates .Diagnosis isCGCGBrown tumorTreated nephrocalcinosisOdontogenic keratocyst 68. Cervical burnout is phenomenon seen inCervical thin enamelCervical cariesproximal cariesOcclusal caries 69. Chromosomal damage maximum during radiotherapy when there is damage toCentrosomeTelomereAutosomeSex chromosome 70. A 21-year-old woman went to her dentist because of facial asymmetry. This asymmetry had developed gradually over 3 years. The patient had no symptoms. A diffusely opaque lesion was found in her right maxilla. All laboratory tests (complete blood count, alkaline phosphatase, calcium) were within normal limits. A biopsy specimen was interpreted as a fibro-osseous lesion. This patient most likely has ______.CementoblastomaFibrous dysplasiaCherubismOsteosarcoma 71. radiographically level of normal alveolar crest is related toCEJDEJgingival marginnone 72. Which of the following uses alogarithmCariogramCariostarlaser dopplerDifoti 73. Fastest X-ray filmCDEF 74. Highly radiosensitive cells areBuccal mucosaLiverLungRetina 75. During radiographic imaging, predominant X-rays are produced by:Bremstrahlung radiationCompton scatteringCoherent scatteringPhotoelectric effect 76. at the atomic level x ray photons lose their energy throughbremstrahlung interactionscollisions with other photonscompton and photoelectric processesspontaneous disintegration and mutation of photon energy 77. Radiotherapy given by implantBrachytherapyTeletherapyPhysiotherapyRadioisotope therapy 78. First radiographic sign of osteomyelitisBlurring of trabeculaeWidening of PDLLoss of vascularitySubperiosteal bone deposition 79. which is the best technique for detecting proximal caries in children with minimum radiation exposurebitewing with paralleling technique bitewing with bisecting angle technique bitewing with RVGpanoramic radiography 80. In taking radiographs, gagging is usually caused whenBite wings are takenThe film is held by the patientThe film is moved across the soft palateThe film impinges on the floor of the mouth 81. Which property of x-ray is utilised in intensifying screensBiochemicalBiologicalChemicalPhysical 82. phosphorus-32 emitsbeta particlesalpha particlesneutronsx rays 83. In cone beam CT scan what is the artifact seen when the size of the object being imaged is smaller than the voxel sizeBeam hardeningStreakingPartial volume averagingDistortion 84. For estimation of radiographic exposure which of the following is used in badgesBaSO4NaOLiFAl2O3 85. ALARA principle stands forAs low as reasonably achievableAs lower as reasonably achievableAs low are resonably achievableAs lower are reasonably achievable 86. the technique employed in radiotherapy to counteract the effect of tumor motion due to breathing is known asarc technique modulationgatingshunting 87. on the radiograph the mesial site of mandibular 1st molar revealed bone loss of 2-3 mm.on probing 6mm pocket was revealed.the discrepancy could be due toangulation of radiographsuperimposition of bone remaining on facial and lingual surfacesbone remaining on mesial aspecttaurodontism 88. Clearing agent in fixer isAmmonium thiosulphateSodium sulphateAcetic acidPotassium bromide 89. Hyperbaric oxygen is beneficial to the patients withActinomycosisOsteoradionecrosisSyphilisTubercular Osteomyelitis 90. The angle at which the operator should stand from x ray tube for safety90-135 degree45-90 degree150-185 degree135-180 degree 91. Film size used to evaluate TMJ8*10 inch10*12 inch5*7 inch4*3 inch 92. Normal angulation for recording a periapical radiograph of a maxillary lateral incisor:70 degress30 degrees-ve 30 degrees40 degrees 93. the size of the periapical film used in adults is21 x 31 mm31 x 41 mm22 x 35 mmnone of the above 94. Bone death in radiation seen after radiation level of20 Gy30 Gy40 Gy50 Gy 95. What is the recommended distance (in feet) that the operator should stand from the patient while taking radiographs?2 feet4 feet6 feet8 feet 96. Which of the following statements about obtaining the most geometrically accurate image is false?The film should be parallel to the object.The central ray should be parallel to the object.The central ray should be perpendicular to the film.The object-to-film distance should be short. 97. The photosensitive component of an x-ray film is ______.Silver halide crystalsSodium thiosulfate crystalsGelatinRare earth elements 98. The primary function of developer is to ____.Reduce crystals of silver halide to solid silver grainsReduce solid silver grains to specks of silver halideRemove unexposed silver halide crystalsRemove exposed silver halide crystals 99. If an exposed radiograph is too dark after proper development, you should ____.Place it back in the fixerPlace it back in the developerDecrease development timeDecrease exposure time 100. It is important that the film base be ____.opaque sensitive to XrayFlexibleCompletely clear Loading...