1. If exposure is doubled but tube current and voltage remains constant thenMaximum energy is doubleMean energy is doubleNumber of protons is doubledProton energy is doubleQuestion 1 of 20 2. Discoid lupus erythematosus has all of the following characteristics except one. Which one is the exception?Produces oral lesions that resemble erosive lichen planusAffects the skin of the face and scalpPredominately affects middle-aged womenInvolves damage to the heart and kidneyQuestion 2 of 20 3. Intranuclear viral inclusions are seen in tissue specimens of which of the following?Solar cheilitisMinor aphthous ulcersGeographic tongueHairy leukoplakiaQuestion 3 of 20 4. The radiolucent portions of the images on a processed dental x-ray film are made up of ____.A gelatin on a cellulose acetate baseMicroscopic grains of metallic silverMicroscopic grains of silver halideUnexposed silver bromideQuestion 4 of 20 5. Chromosomal damage maximum during radiotherapy when there is damage toCentrosomeTelomereAutosomeSex chromosomeQuestion 5 of 20 6. all of the following is true exceptuse of E speed film reduces radiation exposureuse of rectangular collimator reduces radiation exposureuse of rectangular collimator reduces densityuse of collimator reduces size of x ray productionQuestion 6 of 20 7. What is the "critical target" for radiation damageGolgi apparatuslysosomesenzymeschromosomesQuestion 7 of 20 8. the purpose of collimating an x ray beam is toreduce exposure timeremove the less penetrating x ray photonsreduce the size of the beam to facilitate easier visualization of the central rayavoid delivering unnecessary radiation to the patientQuestion 8 of 20 9. in which one of the following condition sialography is contraindicatedrecurrent parotitischronic parotitisacute parotitisductal calculusQuestion 9 of 20 10. On a routine radiographic examination, a well-defined radiolucent lesion was seen in the body of the mandible of a 17-year-old boy. At the time of operation, it proved to be an empty cavity. What is this lesion?Osteoporotic bone marrowAneurysmal bone cystOdontogenic keratocystTraumatic bone cystQuestion 10 of 20 11. all of the following increases radiation exposure exceptuse of low speed filmshigh KVPuse of gridslow KVPQuestion 11 of 20 12. What is the main ingredient of the developing solution that serves to convert the exposed silver salts on the emulsion film into silver metallic ions?Potassium bromideSodium carbonateHydroquinoneSodium sulfiteQuestion 12 of 20 13. What is the effect on radiograph if there are scratches on intensifying screenDark spot on radiographNo effectLight spots on radiographReticulation in the radiographQuestion 13 of 20 14. osteoradionecrosis isnon healing hypoxic woundradiation trauma infectionosteomyelitis with mixed infectionosteomyelitis with anaerobic infectionQuestion 14 of 20 15. ALARA principle stands forAs lower are reasonably achievableAs low as reasonably achievableAs low are resonably achievableAs lower as reasonably achievableQuestion 15 of 20 16. the density of a radiograph is reduced by increasingkilovoltagemiliamperagesource film distanceexposure timeQuestion 16 of 20 17. phosphorus-32 emitsalpha particlesbeta particlesneutronsx raysQuestion 17 of 20 18. Potter-Bucky diaphragm is used toto remove the scattered radiationTo decrease the exposureTo reduce the wavelenght of radiationTo increase KvpQuestion 18 of 20 19. Dose equivalent is expressed in terms ofsievertgraycoulombsquality factorQuestion 19 of 20 20. the purpose of a step down transformer in an x ray apparatus is toreduce danger of "pitting " the focal spot on the anodereduce unnecessary radiationcontrol voltage to the tube filamentcontrol potential between cathode and anodeQuestion 20 of 20 Loading...
