Density of film is increased by all of the following except 1) Increasing mA 2) Increasing kVp 3) Increasing time exposure 4) Increasing the film-source distance
RadiologyAnswer: 4
In pantamograph, if patient places chin in front of focal trough, the structures appear to be 1) Blurred and magnified 2) Blurred and diminished 3) Either magnified or diminished 4) Only blurred
RadiologyAnswer: 2
When evaluating intraoral periapical films which structures have improved sharpness 1) Lingual structures 2) Buccal structures 3) Interproximal structures 4) All of them equally
RadiologyAnswer: 1
Radiation injury to the haemopoietic system of the bone marrow occurs when the whole body exposure ranges between 1) 50-100 rads 2) 200-1000 rads 3) 1000-5000 rads 4) 10,000 rads to more
RadiologyAnswer: 2
At 80 kVp and 15 mA and target film distance of 8 cm, exposure time is 8 seconds. The exposure time at 4 cm is 1) 4 seconds 2) 2 seconds 3) 1 second 4) 1/4 second
RadiologyAnswer: 2
The following is an example of non-particulate radiation 1) X-rays and gamma rays 2) Electrons and beta rays 3) X-rays and beta rays 4) X-rays and electrons
RadiologyAnswer: 1
When diagnosing a fracture of the mandible, an occlusal X-ray is particularly useful for the diagnosis of 1. symphysis fractures 2. subcondylar fractures 3. angle fractures 4. ramus fractures
RadiologyAnswer: 1
Greatest decrease in overall radiation risk from dental X-ray to patients is achieved by 1) Using speed "E" film 2) Rectangular collimation 3) Using a lead apron 4) Increasing target-film distance
