The maximum permissible dose of radiation to the operator of an X-ray machine is 1) 0.05 rem per year 2) 0.5 rem per year 3) 5.0 rem per year 4) 50 rem per year
RadiologyAnswer: 3
An intraoral periapical X-ray is taken for evaluation of impacted third molar. Another X-ray is taken with downward angulation to first one. If third molar is lingual impaction it will appear to 1) Move downward in relation to inferior alveolar canal 2) Move upward in relation to inferior alveolar canal 3) Be stable in relation to inferior alveolar canal 4) None of the above
RadiologyAnswer: 1
Dead bone appears on a radiograph as 1) Radiolucent 2) Radiopaque 3) Cotton wool appearance 4) Salt and pepper appearance
RadiologyAnswer: 2
X-rays were discovered in 1) Nov 1897 2) Oct 1985 3) Nov 1895 4) Nov 1890
RadiologyAnswer: 3
Which of the following is true of paralleling cone technique 1) The radiopacity of the zygoma is superimposed on the roots of third molars 2) Easy to place with the film holder 3) Less of gag reflex 4) No need to sterilize the firm holder
RadiologyAnswer: 2
Which of the following anatomical landmarks of mandible is radiolucent 1) Genial tubercles 2) Mylohyoid ridge 3) External oblique ridge 4) Mandibular canal
RadiologyAnswer: 4
Brown discolouration seen in old radiographic films is due to 1) Overdevelopment 2) Underdevelopment 3) Incomplete fixation 4) Exposure to light
RadiologyAnswer: 3
Smooth surface enamel caries appear on radiographs 1) Radiopaque saucer shaped 2) Radiolucent saucer shaped 3) Mixed radiopaque and radiolucent 4) No radiographic changes
