1. The angle at which the operator should stand from x ray tube for safety135-180 degree150-185 degree45-90 degree90-135 degreeQuestion 1 of 20 2. at the atomic level x ray photons lose their energy throughcompton and photoelectric processescollisions with other photonsspontaneous disintegration and mutation of photon energybremstrahlung interactionsQuestion 2 of 20 3. When mounting a full mouth survey, radiographs of which of the following teeth should be mounted first for orientationright and left bitewingsmandibular central incisorsmaxillary central incisormaxillary right and left molarsQuestion 3 of 20 4. If exposure is doubled but tube current and voltage remains constant thenProton energy is doubleNumber of protons is doubledMaximum energy is doubleMean energy is doubleQuestion 4 of 20 5. sialogram of a normal salivary gland appears asleafy treessialgectasialeafless treessialolithiasisQuestion 5 of 20 6. What is the "critical target" for radiation damagelysosomeschromosomesGolgi apparatusenzymesQuestion 6 of 20 7. An anatomic structure which has a worm hole radiolucency is characteristic ofNutrient canalMaxillary sinusMandibular canalMental foramenQuestion 7 of 20 8. Proper radiographic infection control includes all of the following except one. Which one is the exception?Wearing gloves while making radiographsSterilizing film packetsDisinfecting x-ray machine surfaceCovering working surfaces with barriersQuestion 8 of 20 9. the heel effect resultsin low intensity x ray beam on anode side of central rayin high intensity beam of x ray towards cathodenone of the above are trueboth of them are trueQuestion 9 of 20 10. in which one of the following condition sialography is contraindicatedacute parotitisductal calculuschronic parotitisrecurrent parotitisQuestion 10 of 20 11. ossifying fibroma manifest asmultilocular radiolucencyunilocular opacityunilocular radiolucencymultilocular radiooacityQuestion 11 of 20 12. Radiograph of a tooth shows appearance of a halo around the root.It may be indicative ofHorizontal root fracturePeriapical periostitisRoot cariesWidening of the periodontal ligamentQuestion 12 of 20 13. Mc gregor and trapnell lines are seen on atrue lateral viewSMVwater's viewPA view skullQuestion 13 of 20 14. Film size used to evaluate TMJ8*10 inch5*7 inch10*12 inch4*3 inchQuestion 14 of 20 15. In the body which atom is useful in magnetic resonance imaging(MRI)HydrogenSulphurOxygenNitrogenQuestion 15 of 20 16. which of the following is not done as an investigation in osteosarcoma MRI femurx ray chestbone marrow biopsybone scanQuestion 16 of 20 17. the density of a radiograph is reduced by increasingmiliamperagekilovoltagesource film distanceexposure timeQuestion 17 of 20 18. all of them use non ionizing radiation exceptradiographythermographyultrasonographyMRIQuestion 18 of 20 19. It is important that the film base be ____.opaque FlexibleCompletely clearsensitive to XrayQuestion 19 of 20 20. which one of the following is used to show base of skull,sphenoid sinus,position and orientation of the condyles and fractures of zygomatic archreverse towni projectionthe facial profile surgerysubmentovertex projectionthe TMJ surgeryQuestion 20 of 20 Loading...