1. A dental assistant notices that 99% of the electron energy striking the tungsten target is
converted into what form of energy?
A. X-rays
B. Heat
C. Light
D. Secondary radiation
.The notes state that 99% of electron energy becomes heat, while only 1% becomes x-rays, making
heat the primary byproduct..
2. During a patient's radiographic series, you need to ensure the beam quality and penetrating
power are properly controlled. Which exposure factor directly regulates these properties?
A. Milliamperage
B. Exposure time
C. Kilovoltage peak
D. Source-to-skin distance
kVp controls beam quality and penetrating power, while mA and time control the quantity of x-rays
produced.
3. A new dental assistant asks why the tubehead contains insulating oil. What is the primary
function of this oil based on your notes?
A. To lubricate moving parts
B. To absorb heat and prevent overheating
C. To filter low-energy x-rays
D. To generate electrons
Insulating oil absorbs heat generated during x-ray production and prevents the tubehead from
overheating.
4. You are reviewing a radiograph and see that the pulp tissue, air spaces, and soft tissues appear
very dark. How should you describe these structures using proper terminology?
A. Radiopaque
,B. Radiolucent
C. Dense
D. White
Radiolucent structures allow x-rays to pass through easily, appearing dark on the image, such as pulp
and air spaces.
5. A patient asks why their enamel appears white on the dental x-ray. Which property of enamel
explains this radiographic appearance?
A. It is radiolucent
B. It is radiopaque because it absorbs x-rays
C. It contains air pockets
D. It has low density
Radiopaque structures like enamel absorb x-rays and appear light or white on the radiograph.
6. During a panoramic exposure, the patient's spine is slumped forward, creating a white shadow
in the center of the image. How should you correct this error?
A. Lower the chin further
B. Have the patient stand up straight to elongate the spine
C. Increase the kVp
D. Move the patient closer to the machine
A slumped posture causes a white shadow on the spine; correcting posture by standing straight
eliminates this artifact.
7. You are exposing a periapical radiograph and the resulting image shows teeth that appear too
long and stretched. What vertical angulation error most likely caused this elongation?
A. Vertical angulation too steep
B. Vertical angulation too low (too flat)
C. Horizontal angulation incorrect
D. PID too short
Elongation occurs when the vertical angulation is too flat, causing the x-ray beam to project the
tooth longer than actual.
8. According to your study notes, what is the maximum permissible dose (MPD) for occupational
exposure per year?
A. 0.5 rems
,B. 5.0 rems (5000 millirems)
C. 50 rems
D. 500 millirems
The MPD for occupational exposure is 5.0 rems or 5000 millirems per year to protect workers from
harmful effects.
9. A dental assistant is cleaning the operatory after taking radiographs and needs to handle
contaminated surfaces. What type of gloves should be worn for this cleaning task?
A. Patient examination gloves
B. Overgloves
C. Utility gloves
D. No gloves are needed
Utility gloves are thicker and designed for cleaning contaminated surfaces and equipment after
procedures.
10. You are setting up for a digital radiographic exposure. According to your notes, what is always
required when using digital imaging systems?
A. Darkroom chemicals
B. Lead foil
C. A computer monitor
D. Developing solution
Digital imaging requires a computer monitor to view, process, and store the radiographic images.
11. A radiolucent band with radiopaque borders is visible below the mandibular molars on a
periapical radiograph. Which anatomical landmark does this describe?
A. Mental foramen
B. Mandibular canal
C. Genial tubercles
D. External oblique ridge
The mandibular canal appears as a radiolucent band with radiopaque borders housing the inferior
alveolar nerve.
12. What is the primary purpose of the aluminum filter inside the x-ray tubehead?
A. To increase the speed of electrons
B. To remove low-energy, non-penetrating x-rays from the beam
, C. To focus the x-ray beam
D. To produce more heat
The aluminum filter removes low-energy, long-wavelength x-rays that do not contribute to image
formation and increase patient dose.
13. You are positioning a patient for a panoramic radiograph and need to align the Frankfort
plane. How should this plane be oriented relative to the floor?
A. Perpendicular to the floor
B. Parallel to the floor
C. At a 45-degree angle
D. Tilted downward
The Frankfort plane must be parallel to the floor to ensure proper orientation of the maxilla and
mandible on the panoramic image.
14. A radiograph shows a clear, unexposed semicircular area on the image, and the teeth are
partially missing. What technical error has occurred?
A. Overexposure
B. Patient movement
C. Cone cut (PID misalignment)
D. Double exposure
A cone cut appears as a clear unexposed area caused by the PID not being centered over the image
receptor.
15. Which component of the x-ray tubehead is responsible for producing electrons?
A. Anode
B. Tungsten target
C. Cathode
D. Aluminum filter
The cathode is the negative electrode that produces electrons through thermionic emission.
16. You notice on a bitewing radiograph that the contact areas of adjacent teeth are overlapping,
making it impossible to diagnose proximal caries. What caused this error?
A. Incorrect vertical angulation
B. Incorrect horizontal angulation
converted into what form of energy?
A. X-rays
B. Heat
C. Light
D. Secondary radiation
.The notes state that 99% of electron energy becomes heat, while only 1% becomes x-rays, making
heat the primary byproduct..
2. During a patient's radiographic series, you need to ensure the beam quality and penetrating
power are properly controlled. Which exposure factor directly regulates these properties?
A. Milliamperage
B. Exposure time
C. Kilovoltage peak
D. Source-to-skin distance
kVp controls beam quality and penetrating power, while mA and time control the quantity of x-rays
produced.
3. A new dental assistant asks why the tubehead contains insulating oil. What is the primary
function of this oil based on your notes?
A. To lubricate moving parts
B. To absorb heat and prevent overheating
C. To filter low-energy x-rays
D. To generate electrons
Insulating oil absorbs heat generated during x-ray production and prevents the tubehead from
overheating.
4. You are reviewing a radiograph and see that the pulp tissue, air spaces, and soft tissues appear
very dark. How should you describe these structures using proper terminology?
A. Radiopaque
,B. Radiolucent
C. Dense
D. White
Radiolucent structures allow x-rays to pass through easily, appearing dark on the image, such as pulp
and air spaces.
5. A patient asks why their enamel appears white on the dental x-ray. Which property of enamel
explains this radiographic appearance?
A. It is radiolucent
B. It is radiopaque because it absorbs x-rays
C. It contains air pockets
D. It has low density
Radiopaque structures like enamel absorb x-rays and appear light or white on the radiograph.
6. During a panoramic exposure, the patient's spine is slumped forward, creating a white shadow
in the center of the image. How should you correct this error?
A. Lower the chin further
B. Have the patient stand up straight to elongate the spine
C. Increase the kVp
D. Move the patient closer to the machine
A slumped posture causes a white shadow on the spine; correcting posture by standing straight
eliminates this artifact.
7. You are exposing a periapical radiograph and the resulting image shows teeth that appear too
long and stretched. What vertical angulation error most likely caused this elongation?
A. Vertical angulation too steep
B. Vertical angulation too low (too flat)
C. Horizontal angulation incorrect
D. PID too short
Elongation occurs when the vertical angulation is too flat, causing the x-ray beam to project the
tooth longer than actual.
8. According to your study notes, what is the maximum permissible dose (MPD) for occupational
exposure per year?
A. 0.5 rems
,B. 5.0 rems (5000 millirems)
C. 50 rems
D. 500 millirems
The MPD for occupational exposure is 5.0 rems or 5000 millirems per year to protect workers from
harmful effects.
9. A dental assistant is cleaning the operatory after taking radiographs and needs to handle
contaminated surfaces. What type of gloves should be worn for this cleaning task?
A. Patient examination gloves
B. Overgloves
C. Utility gloves
D. No gloves are needed
Utility gloves are thicker and designed for cleaning contaminated surfaces and equipment after
procedures.
10. You are setting up for a digital radiographic exposure. According to your notes, what is always
required when using digital imaging systems?
A. Darkroom chemicals
B. Lead foil
C. A computer monitor
D. Developing solution
Digital imaging requires a computer monitor to view, process, and store the radiographic images.
11. A radiolucent band with radiopaque borders is visible below the mandibular molars on a
periapical radiograph. Which anatomical landmark does this describe?
A. Mental foramen
B. Mandibular canal
C. Genial tubercles
D. External oblique ridge
The mandibular canal appears as a radiolucent band with radiopaque borders housing the inferior
alveolar nerve.
12. What is the primary purpose of the aluminum filter inside the x-ray tubehead?
A. To increase the speed of electrons
B. To remove low-energy, non-penetrating x-rays from the beam
, C. To focus the x-ray beam
D. To produce more heat
The aluminum filter removes low-energy, long-wavelength x-rays that do not contribute to image
formation and increase patient dose.
13. You are positioning a patient for a panoramic radiograph and need to align the Frankfort
plane. How should this plane be oriented relative to the floor?
A. Perpendicular to the floor
B. Parallel to the floor
C. At a 45-degree angle
D. Tilted downward
The Frankfort plane must be parallel to the floor to ensure proper orientation of the maxilla and
mandible on the panoramic image.
14. A radiograph shows a clear, unexposed semicircular area on the image, and the teeth are
partially missing. What technical error has occurred?
A. Overexposure
B. Patient movement
C. Cone cut (PID misalignment)
D. Double exposure
A cone cut appears as a clear unexposed area caused by the PID not being centered over the image
receptor.
15. Which component of the x-ray tubehead is responsible for producing electrons?
A. Anode
B. Tungsten target
C. Cathode
D. Aluminum filter
The cathode is the negative electrode that produces electrons through thermionic emission.
16. You notice on a bitewing radiograph that the contact areas of adjacent teeth are overlapping,
making it impossible to diagnose proximal caries. What caused this error?
A. Incorrect vertical angulation
B. Incorrect horizontal angulation
