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NBDHE Practice Questions with complete solutions
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NBDHE Practice Questions withcomplete solutions
The x-ray was discovered by
a. Heinrich Geissler
b. Wilhelm Roentgen
c. Johann Hittorf
d. William Crookes - correct answer -Wilhelm Roentgen
Which discovery was the precursor to the discovery of x-rays?
A. Beta particles
B. Alpha particles
C. Cathode rays
D. Radioactive materials - correct answer -Cathode rays
Which term describes two or more atoms that are joined by a chemical bond?
a. ion
b. ion pair
c. molecule
d. proton - correct answer -Molecule
Which is not a type of particulate radiation?
A. Alpha particles
B. Beta particles
C. Protons
D. Nucleons - correct answer -Nucleons
Which is the location where x-rays are produced?
,A. Positive cathode
B. Positive anode
C. Negative cathode
D. Negative anode - correct answer -Positive anode
Which describes scatter radiation?
A. Radiation that exits the tubehead
B. Radiation that is more penetrating than primary radiation
C. Radiation that has been deflected from its path by interaction with matter
D. none of the above - correct answer -Radiation that has been deflected from its path by interaction
with matter
In dental imaging, the quality of the x ray beam is controlled by?
a. kilovoltage
b. miliamperage
c. exposure time
d. source-to-receptor distance - correct answer -Kilovoltage
Increasing milliamperage results in an increase in:
A. Temperature of filament
B. Mean energy of beam
C. Number of x-rays produced
D. Both A & C - correct answer -Temperature of filament and number of x-rays produced
The overall blackness or darkness of an image is termed
a. contrast
b. density
c. overexposure
d. polychromatic - correct answer -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 - correct answer -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 - correct answer -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 - correct answer -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 - correct answer -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 - correct answer -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 - correct answer -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 - correct answer -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) - correct answer -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
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