Radiology Test 1 Multiple Choice
Which of the following statements regarding all electromagnetic radiations of the
electromagentic spectrum is incorrect?
A:They are arranged according to their wavelength and frequency
B:They have no mass
C:They have no electrical charges
D:They travel at various speeds ANSWERS D
X-rays were discovered in the year:
A:1985
B:1895
C:1865
D:1898 ANSWERS B
The process by which the nucleus of an unstable atom decays in an effort to obtain a
more balanced state is termed:
A:radioactivity
B:radiation
C:radiographs
D:radiography ANSWERS A
Of the following, select the scientific term used for referencing the approximate amount
of time radioactive elements take to decay:
A:Half-life
B:isotope
C:half-value layer
D:alpha time ANSWERS A
All of the following regarding ionization is true except:
A:all radiations on the electromagnetic spectrum may cause ionization
B:Ionization is the process whereby an electrically neutral atom becomes unstable
through the loss of an orbital shell electron
C:ionization is a dangerous characteristic of X-radiation
D:ionization can cause stable but harmful re-combinations of atoms to occur
ANSWERS A
Which of the following is specific for each element and establishes its chemical
characteristics?
A:protons
B:Neutrons
C:electrons
,D:Orbital shells ANSWERS A
Which of the following describes the primary use of the bite-wing radiograph?
a. examination of the apical areas of teeth
b. examination of the apical and interproximal areas of teeth
c. examination of the interproximal areas of teeth
d. examination of the pulp chambers of teeth ANSWERS C
Which of the following is the correct vertical angulation used with the bite-wing
technique?
a. −10 degrees
b. −20 degrees
c. +10 degrees
d. +15 degrees ANSWERS C
Which of the following describes the relationship of the film to the maxillary and
mandibular teeth in the bite-wing technique?
a. The film and teeth are parallel to each other.
b. The film and teeth are at right angles to each other.
c. The film and teeth are perpendicular to each other.
d. The film and teeth intersect each other. ANSWERS A
Which of the following is correct concerning film placement? (1) anterior bite-wings may
be placed horizontally; (2) anterior bite-wings may be placed vertically; (3) posterior
bite-wings may be placed horizontally; (4) posterior bite-wings may be placed vertically
a. 1, 2, 3
b. 2, 3, 4
c. 2, 3
d. 1, 4 ANSWERS B
Which of the following is incorrect concerning the exposure sequence for a CMRS that
includes periapicals and bite-wings?
a. Anterior periapicals are always exposed first.
b. Posterior periapicals are exposed after anterior periapicals.
c. Bite-wings are exposed last.
d. none of the above ANSWERS B
Which of the following statements is true regarding dental radiographs?
A:an oral examination with dental radiographs limits the practitioner to what is only seen
clinically
B:Dental radiographs are not a necessary component in providing comprehensive
dental treatment planning
C:Radiographs are an important tool in detecting many dental diseases
D:under no circumstances should dental radiographs be taken on a pregnant patient
ANSWERS C
, Which device within the x-ray machine is responsible for decreasing the voltage at the
cathode?
A:rectifying device
B:step down transformer
C:rheostat
D:autotransformer ANSWERS B
Which term describes electrical pressure or force?
A:amperage
B:ionization
C:voltage
D:rectification ANSWERS C
Which part of the x-ray tube is heated when the electrical current passes into the
cathode circuit?
A:the focal spot
B:the tungsten filament
C:the copper stem
D:the anode ANSWERS B
The actual focal spot in the tungsten target:
A:serves to generate x-rays over a large surface area for better dissipation of heat
B:serves to concentrate the produced x-rays into a smaller area for increased image
clearity
C:is angled at 40 degrees
D:is square ANSWERS A
The PID is the extension of the
A:exposure button
B:Control panel
C:extension arm
D:tubehead ANSWERS D
The effective focal spot
A:triangle
B:square
C:rectangle
D:photoelectric ANSWERS B
What metal is used for the target in the x-ray tube?
A:tungsten
B:copper
C:aluminum
D:molybdenum ANSWERS A
Which of the following statements regarding all electromagnetic radiations of the
electromagentic spectrum is incorrect?
A:They are arranged according to their wavelength and frequency
B:They have no mass
C:They have no electrical charges
D:They travel at various speeds ANSWERS D
X-rays were discovered in the year:
A:1985
B:1895
C:1865
D:1898 ANSWERS B
The process by which the nucleus of an unstable atom decays in an effort to obtain a
more balanced state is termed:
A:radioactivity
B:radiation
C:radiographs
D:radiography ANSWERS A
Of the following, select the scientific term used for referencing the approximate amount
of time radioactive elements take to decay:
A:Half-life
B:isotope
C:half-value layer
D:alpha time ANSWERS A
All of the following regarding ionization is true except:
A:all radiations on the electromagnetic spectrum may cause ionization
B:Ionization is the process whereby an electrically neutral atom becomes unstable
through the loss of an orbital shell electron
C:ionization is a dangerous characteristic of X-radiation
D:ionization can cause stable but harmful re-combinations of atoms to occur
ANSWERS A
Which of the following is specific for each element and establishes its chemical
characteristics?
A:protons
B:Neutrons
C:electrons
,D:Orbital shells ANSWERS A
Which of the following describes the primary use of the bite-wing radiograph?
a. examination of the apical areas of teeth
b. examination of the apical and interproximal areas of teeth
c. examination of the interproximal areas of teeth
d. examination of the pulp chambers of teeth ANSWERS C
Which of the following is the correct vertical angulation used with the bite-wing
technique?
a. −10 degrees
b. −20 degrees
c. +10 degrees
d. +15 degrees ANSWERS C
Which of the following describes the relationship of the film to the maxillary and
mandibular teeth in the bite-wing technique?
a. The film and teeth are parallel to each other.
b. The film and teeth are at right angles to each other.
c. The film and teeth are perpendicular to each other.
d. The film and teeth intersect each other. ANSWERS A
Which of the following is correct concerning film placement? (1) anterior bite-wings may
be placed horizontally; (2) anterior bite-wings may be placed vertically; (3) posterior
bite-wings may be placed horizontally; (4) posterior bite-wings may be placed vertically
a. 1, 2, 3
b. 2, 3, 4
c. 2, 3
d. 1, 4 ANSWERS B
Which of the following is incorrect concerning the exposure sequence for a CMRS that
includes periapicals and bite-wings?
a. Anterior periapicals are always exposed first.
b. Posterior periapicals are exposed after anterior periapicals.
c. Bite-wings are exposed last.
d. none of the above ANSWERS B
Which of the following statements is true regarding dental radiographs?
A:an oral examination with dental radiographs limits the practitioner to what is only seen
clinically
B:Dental radiographs are not a necessary component in providing comprehensive
dental treatment planning
C:Radiographs are an important tool in detecting many dental diseases
D:under no circumstances should dental radiographs be taken on a pregnant patient
ANSWERS C
, Which device within the x-ray machine is responsible for decreasing the voltage at the
cathode?
A:rectifying device
B:step down transformer
C:rheostat
D:autotransformer ANSWERS B
Which term describes electrical pressure or force?
A:amperage
B:ionization
C:voltage
D:rectification ANSWERS C
Which part of the x-ray tube is heated when the electrical current passes into the
cathode circuit?
A:the focal spot
B:the tungsten filament
C:the copper stem
D:the anode ANSWERS B
The actual focal spot in the tungsten target:
A:serves to generate x-rays over a large surface area for better dissipation of heat
B:serves to concentrate the produced x-rays into a smaller area for increased image
clearity
C:is angled at 40 degrees
D:is square ANSWERS A
The PID is the extension of the
A:exposure button
B:Control panel
C:extension arm
D:tubehead ANSWERS D
The effective focal spot
A:triangle
B:square
C:rectangle
D:photoelectric ANSWERS B
What metal is used for the target in the x-ray tube?
A:tungsten
B:copper
C:aluminum
D:molybdenum ANSWERS A
