MDS PREP
Radiation dose to patient can be reduced by all of the following except
1) Speed films
2) Filters
3) By increasing target-object distance
4) Decreasing kilovoltage potential
Radiology
Answer: 4
The effect of short exposure on contrast of film
1) Contrast increases
2) Contrast decreases
3) Contrast is constant
4) Contrast is variable
Radiology
Answer: 2
80 kVp and 15 mA and source film distance of 8 inches exposure time for a film is 1/2 second. Keeping the kilovoltage and miliamperage constant exposure time at 16 inches
1) 1/2 second
2) 1 second
3) 2 second
4) 4 second
Radiology
Answer: 3
An exposure of 2 R is recorded at point 8 cm. Keeping the same beam the exposure at 4 cm is
1) 4 R
2) 6 R
3) 8 R
4) 16 R
Radiology
Answer: 3
Quality of x-ray beam is dependent on which component of dental unit
1) Autotransformer
2) Ammeter
3) Temperature of cathode filament
4) Step-down transformer
Radiology
Answer: 1
...............is not a property of X-rays
1. Ionization
2. Action on photographic film
3. Excitation
4. Collimation