DANB RHS PRACTICE TEST EXAM 2025
QUESTIONS AND ANSWERS
Why is aluminum filtration used in dental X-ray tubeheads? - ANS to harden the beam by
removing low-energy protons
The use of a rectangular collimator in dental radiography serves to: - ANS reduce the
radiation dose to the patient
What is the effect of increasing the kVp (kilovoltage peak) on the contrast of a dental
radiographic image? - ANS decreases contrast, producing more shades of gray
In panoramic radiography, what is the primary reason for the patient to bite on a bite block
during image acquisition? - ANS to align the teeth with the focal trough
Which of the following factors does NOT affect the sharpness of a dental radiographic image? -
ANS beam collimation
What is the most appropriate angle of vertical angulation for a maxillary molar periapical
radiograph using the bisecting angle technique? - ANS 45 degrees
When considering the inverse square law in dental radiography, if the distance from the X-ray
source to the film is doubled, how does this affect the intensity of the X-ray beam? - ANS it is
reduced to one-fourth
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, When adjusting the milliamperage on a dental X-ray unit, what is the primary outcome on the
resulting image? - ANS increased mA results in a denser (darker) image
In dental radiography, the term "contrast resolution" refers to: - ANS the ability to
distinguish between different shades of gray
What is the primary purpose of using a grid in dental radiography? - ANS to reduce scatter
radiation and improve image clarity
In the context of dental radiography, what is the significance of the anode heel effect? -
ANS it results in varying intensities across the X-ray beam, affecting film density
What is the primary function of the fixer solution in film processing? - ANS to remove
unexposed and undeveloped silver halide crystals
In dental radiography, the use of a faster film speed: - ANS reduces patient exposure to
radiation
The principle of ALARA in dental radiography stands for: - ANS as low as reasonably
achievable
When discussing the quality of an X-ray beam, what does the term "hardness" refer to? -
ANS the ability of the beam to penetrate tissues and objects
What is the primary reason for using a lead apron with a thyroid collar during dental
radiography? - ANS to protect sensitive organs from scatter radiation
What is the effect of using a longer PID (position-indicating device) in dental radiography? -
ANS it reduces the magnification and distortion of the image
2
Page
@COPYRIGHT SIRJOEL 2025/2026
QUESTIONS AND ANSWERS
Why is aluminum filtration used in dental X-ray tubeheads? - ANS to harden the beam by
removing low-energy protons
The use of a rectangular collimator in dental radiography serves to: - ANS reduce the
radiation dose to the patient
What is the effect of increasing the kVp (kilovoltage peak) on the contrast of a dental
radiographic image? - ANS decreases contrast, producing more shades of gray
In panoramic radiography, what is the primary reason for the patient to bite on a bite block
during image acquisition? - ANS to align the teeth with the focal trough
Which of the following factors does NOT affect the sharpness of a dental radiographic image? -
ANS beam collimation
What is the most appropriate angle of vertical angulation for a maxillary molar periapical
radiograph using the bisecting angle technique? - ANS 45 degrees
When considering the inverse square law in dental radiography, if the distance from the X-ray
source to the film is doubled, how does this affect the intensity of the X-ray beam? - ANS it is
reduced to one-fourth
1
Page
@COPYRIGHT SIRJOEL 2025/2026
, When adjusting the milliamperage on a dental X-ray unit, what is the primary outcome on the
resulting image? - ANS increased mA results in a denser (darker) image
In dental radiography, the term "contrast resolution" refers to: - ANS the ability to
distinguish between different shades of gray
What is the primary purpose of using a grid in dental radiography? - ANS to reduce scatter
radiation and improve image clarity
In the context of dental radiography, what is the significance of the anode heel effect? -
ANS it results in varying intensities across the X-ray beam, affecting film density
What is the primary function of the fixer solution in film processing? - ANS to remove
unexposed and undeveloped silver halide crystals
In dental radiography, the use of a faster film speed: - ANS reduces patient exposure to
radiation
The principle of ALARA in dental radiography stands for: - ANS as low as reasonably
achievable
When discussing the quality of an X-ray beam, what does the term "hardness" refer to? -
ANS the ability of the beam to penetrate tissues and objects
What is the primary reason for using a lead apron with a thyroid collar during dental
radiography? - ANS to protect sensitive organs from scatter radiation
What is the effect of using a longer PID (position-indicating device) in dental radiography? -
ANS it reduces the magnification and distortion of the image
2
Page
@COPYRIGHT SIRJOEL 2025/2026
