2024 /2025 | © copyright | This work may not be copied for profit gain | Excel!
Dental Assisting Radiology MN Licensure
Questions and Answers | Latest Update
This is a device used to reduce the amount of scatter radiation that reaches an extraoral
film during exposure.
✓ -:- grid
Identify the error that causes teeth to appear foreshortened on a radiograph.
✓ -:- excessive vertical angle
Identify the benefit of using a long-cone (16 inch) position-indicating device, versus a short-
cone (8inch) position indicating device.
✓ -:- less magnification
What is the angulation of the central ray when using the bisection angle technique?
✓ -:- 90 degrees to the imaginary bisector
The clearing test is used for checking the:
✓ -:- fixer solution
The step-up transformer is activated by the:
1|P a g e | G r a d e A + | 2 0 2 0 2 5
,2024 /2025 | © copyright | This work may not be copied for profit gain | Excel!
✓ -:- exposure button
If the intensity of a beam of radiation is given a value of "12" at a point 12 inches from the
target the intensity of the beam at 24 inches from the target would be:
✓ -:- 3
Which type pf PID (positioning indicating device) is most effective in reducing patient
exposure?
✓ -:- rectangular
Which of the following describes the use of a filter in a dental x-ray machine?
a. a filter removes low-energy x-rays
b. a filer decreases the mean energy of the beam
c. a filer reduces the size and shape of the beam
d. a filer removes the dose of radiation to the thyroid gland
✓ -:- a. filter removes low-energy x-rays
Which of the following is used as a collimator?
a. lead plate
b. aluminum plate
c. copper plate
2|P a g e | G r a d e A + | 2 0 2 0 2 5
, 2024 /2025 | © copyright | This work may not be copied for profit gain | Excel!
d. molybdenum cup
✓ -:- a. lead plate
What is the purpose of the lead foil in the film packets?
✓ -:- to stop the backscatter radiation
The step-down transformer is controlled by the?
✓ -:- mA dial (milliamperage)
Where are x-rays produced?
✓ -:- positive anode
X-rays are made up of:
✓ -:- photons
Which film speed is currently the fastest intraoral film available?
✓ -:- F speed film
Which of the following appear most radiopaque on a radiograph?
a. enamel
b. silver points
3|P a g e | G r a d e A + | 2 0 2 0 2 5
Dental Assisting Radiology MN Licensure
Questions and Answers | Latest Update
This is a device used to reduce the amount of scatter radiation that reaches an extraoral
film during exposure.
✓ -:- grid
Identify the error that causes teeth to appear foreshortened on a radiograph.
✓ -:- excessive vertical angle
Identify the benefit of using a long-cone (16 inch) position-indicating device, versus a short-
cone (8inch) position indicating device.
✓ -:- less magnification
What is the angulation of the central ray when using the bisection angle technique?
✓ -:- 90 degrees to the imaginary bisector
The clearing test is used for checking the:
✓ -:- fixer solution
The step-up transformer is activated by the:
1|P a g e | G r a d e A + | 2 0 2 0 2 5
,2024 /2025 | © copyright | This work may not be copied for profit gain | Excel!
✓ -:- exposure button
If the intensity of a beam of radiation is given a value of "12" at a point 12 inches from the
target the intensity of the beam at 24 inches from the target would be:
✓ -:- 3
Which type pf PID (positioning indicating device) is most effective in reducing patient
exposure?
✓ -:- rectangular
Which of the following describes the use of a filter in a dental x-ray machine?
a. a filter removes low-energy x-rays
b. a filer decreases the mean energy of the beam
c. a filer reduces the size and shape of the beam
d. a filer removes the dose of radiation to the thyroid gland
✓ -:- a. filter removes low-energy x-rays
Which of the following is used as a collimator?
a. lead plate
b. aluminum plate
c. copper plate
2|P a g e | G r a d e A + | 2 0 2 0 2 5
, 2024 /2025 | © copyright | This work may not be copied for profit gain | Excel!
d. molybdenum cup
✓ -:- a. lead plate
What is the purpose of the lead foil in the film packets?
✓ -:- to stop the backscatter radiation
The step-down transformer is controlled by the?
✓ -:- mA dial (milliamperage)
Where are x-rays produced?
✓ -:- positive anode
X-rays are made up of:
✓ -:- photons
Which film speed is currently the fastest intraoral film available?
✓ -:- F speed film
Which of the following appear most radiopaque on a radiograph?
a. enamel
b. silver points
3|P a g e | G r a d e A + | 2 0 2 0 2 5
