NBDHE Practice Question Graded A+
1. The x-ray was discovered by - Wilhelm Roentgen
2. Which discovery was the precursor to the discovery of x-rays? - Cathode rays (C)
3. Which term describes two or more atoms that are joined by a chemical bond? - Molecule (C)
4. Which is not a type of part...
NBDHE Practice Question Graded A+
1. The x-ray was discovered by
- Wilhelm Roentgen
2. Which discovery was the precursor to the discovery of x-rays?
- Cathode rays (C)
3. Which term describes two or more atoms that are joined by a chemical bond?
- Molecule (C)
4. Which is not a type of particulate radiation?
- Nucleons (D)
5. Which is the location where x-rays are produced?
- Positive anode (B)
6. Which describes scatter radiation?
- Radiation that has been deflected from its path by interaction with matter (C)
7. In dental imaging, the quality of the x-ray beam is controlled by?
- Kilovoltage (A)
8. Increasing milliamperage results in an increase in:
- Temperature of filament and number of x-rays produced (D)
The overall blackness or darkness of an image is termed
a. contrast
b. density
c. overexposure
,d. polychromatic ✔️Density
If the target receptor distance is doubled, the resultant beam will be
a. four times as intense
b. twice as intense
c. half as intense
d. one fourth as intense ✔️One fourth as intense
The latent period in radiation biology is the time between
a. initial injury and repair
b. subsequent doses of radiation
c. cell rest and cell mitosis
d. exposure to x-radiation and clinical symptoms ✔️Exposure to x radiation and clinical symptoms
Which factor(s) contributes to radiation injury?
A. Total dose
B. Dose rate
C. Cell sensitivity
D. Age
E. All of the above ✔️All of the above
The traditional unit for measuring x-ray exposure in air is termed
a. gray
b. coulombs per kilogram
c. rem
d. rad
e. roentgen ✔️Roentgen
,Which is considered radioresistant?
A. Immature reproductive cells
B. Young bone cells
C. Mature bone cells
D. Epithelial cells
E. None of the above ✔️Mature bone cells
Which position indicating device is most effective in reducing patient exposure?
A. Conical
B. Rectangular
C. Circular
D. all are equally effective in reducing patient exposure ✔️Rectangular
Which statement describes the function of a filter in a dental x-ray tube head?
A. It reduces the size and shape of the beam
B. It removes low energy x rays
C. It removes the dose of radiation to the thyroid gland
D. It decreases the mean energy of the beam ✔️It removes low energy x rays
The dental radiographer can regulate the x ray beam (kVp, mA, time) through the use of the
a. control panel
b. extension arm
c. console
d. position-indicating device (PID) ✔️Control panel
One advantage of a film with an emulsion coating on both sides (double-emulsion film) is that
a. the film requires less radiation exposure to make an image
b. the image produced is less distorted
, c. the film has less sensitivity to radiation
d. processing solutions are absorbed more easily ✔️The film requires less radiation exposure to make
an image
The intensifying screen that emits green light and must be used with green sensitive film is termed
a. calcium tungstate
b. rare earth
c. phosphor
d. rare tungstate ✔️Rare earth
A dental image that demonstrates many shades of gray is said to have
a. high contrast
b. low contrast
c. high density
d. low density ✔️Low contrast
The hydroquinone in the developer brings out the _____ tones, whereas the Elon in the developer bring
out the _____ tones on a dental radiograph.
a. black; white
b. white; black
c. gray; gray
d. white; gray
e. black; gray ✔️Black; gray
A universal safelight filter such as the GBX-2 by the Carestream Health is recommended for
a. intraoral films only
b. extraoral screen films only
c. extraoral nonscreen films only
d. intraoral and extraoral films ✔️Intraoral and extraoral films
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