Radiology Best Answer
- 1.
The penetrating power of xrays depend on
- A.
Kvp
- B.
Ma
- C.
Film speed
- D.
Focal film distance
Correct Answer
A. Kvp -
- 2.
The size of the collimated beam for intraoral radiology measured at the patient skin is
- A.
1.5 to 1.75 inches
- B.
2.0 to 2.25 inches
- C.
2.75 to 3.00 inches
- D.
3.25 to 3.50 inches
Correct Answer
C. 2.75 to 3.00 inches -
- 3.
Filtration of the xray beam protects the patient by
- A.
Eliminating all radiation from the xray head
- B.
Eliminating weak wavelength xrays from the x ray beam
- C.
Eliminating short wavelength x rays from the xray beam
- D.
Decreasing exposure time
Correct Answer
B. Eliminating weak wavelength xrays from the x ray beam -
- 4.
The most penetrating xrays have
- A.
Low frequencies
- B.
Soft rays
- C.
Long wavelengths
- D.
Long wavelengths
- E.
Short wavelengths
Correct Answer
E. Short wavelengths -
- 5.
The x ray which is at the center of the primary beam is called the
- A.
Cathode ray
- B.
Secondary ray
- C.
Restricted beam
- D.
Central ray
Correct Answer
D. Central ray -
- 6.
The housing of the xray tube is
- A.
Copper
- B.
Plastic
- C.
Tungsten
- D.
Glass
Correct Answer
B. Plastic -
- 7.
As the target film distance is increased there is
- A.
More chance of elongation
- B.
More chance of overlapping
- C.
More chance of foreshortening
- D.
Less distortion
Correct Answer
D. Less distortion -
- 8.
Overlapping is a result of
- A.
Incorrect vertical angulation
- B.
Incorrect horizontal angulation
- C.
Excessive bending of the film
- D.
All of the above
Correct Answer
B. Incorrect horizontal angulation -
- 9.
After a film is exposed, the target film distance is doubled. the exposure time necessary to obtain a second film of equal density to the first film is
- A.
The same as the first film
- B.
Twofold
- C.
Threefold
- D.
Fourfold
Correct Answer
D. Fourfold -
- 10.
Wich cells are the most sensitive to xrays?
- A.
Muscle
- B.
Nerve
- C.
Sperm
- D.
Epithelial
Correct Answer
C. Sperm -
- 11.
Which cells are the least sensitive to x rays?
- A.
Ova
- B.
Blood
- C.
Sperm
- D.
Nerve
Correct Answer
D. Nerve -
- 12.
The first sign of x ray dermatitis is
- A.
Loss of hair
- B.
Purulent exudate
- C.
Erythema
- D.
Pain
Correct Answer
C. Erythema -
- 13.
Scatter radiation is a type of
- A.
Secondary radiation
- B.
Primary radiation
- C.
Stray radiation
- D.
None of the above
Correct Answer
A. Secondary radiation -
- 14.
The lead foil in the xray film packet is used to
- A.
Stop unused radiation
- B.
Tell the front of the film from the back
- C.
Prevent film fogging
- D.
Decrease operator's radiation exposure
Correct Answer(s)
A. Stop unused radiation
C. Prevent film fogging -
- 15.
The quality or penetrating power of secondary radiation is
- A.
More than that of primary radiation
- B.
Less than that of primary radiation
- C.
The same as that of primary radiation
- D.
Unrelated to that of primary radiation
Correct Answer
B. Less than that of primary radiation -
- 16.
If a radiograph remains in the developing solution too long the film will be
- A.
Lighter
- B.
Darker
- C.
Lighter only if the temperature is increased
- D.
Unaffected because time is not a factor
Correct Answer
B. Darker -
- 17.
Film fog may occur if there is
- A.
A light leak in the darkroom
- B.
Bending of the film
- C.
Reversal of the film
- D.
Extremely thick bone
Correct Answer
A. A light leak in the darkroom -
- 18.
Films not fixed for a long enough period of time will appear
- A.
To have black lines running through them
- B.
To be brittle
- C.
To have a brown tint
- D.
White
Correct Answer
C. To have a brown tint -
- 19.
Film is washed after removing it from the developing solution to
- A.
Remove any debris on the film
- B.
Speed up the developing process
- C.
Stop the developing process
- D.
Remove the precipitated silver salts
Correct Answer
C. Stop the developing process -
- 20.
In order for the developing chemicals to work, the solution must be
- A.
Acidic
- B.
Neutral
- C.
Basic
Correct Answer
C. Basic -
- 21.
Fixing the film
- A.
Removes the unaffected silver salts
- B.
Removes the affected silver salts
- C.
Softens the film
- D.
Peels the emulsion from the film base
Correct Answer
A. Removes the unaffected silver salts -
- 22.
The fixing solution is
- A.
Acidic
- B.
Neutral
- C.
Basic
- D.
First basic then neutral after dilution
Correct Answer
A. Acidic -
- 23.
Reticulation is
- A.
Cracking of the film emulsion
- B.
An electric charge in the developing solution
- C.
A latent image
- D.
Due to excess radiation
Correct Answer
A. Cracking of the film emulsion -
- 24.
The optimum time temperature relationship for processing dental radiographs is
- A.
74 f for 4 1/2 minutes
- B.
68 F for 6 minutes
- C.
50 F for 5 minutes
- D.
Varied according to manufactures specification
Correct Answer
D. Varied according to manufactures specification -
- 25.
The panoramic radiograph is not diagnostic for
- A.
Caries detection
- B.
General survey
- C.
Confirmation of mandibular fractures
- D.
Detection of impacted wisdom teeth
Correct Answer
A. Caries detection -
- 26.
Bitewing radiographs are useful in helping to determine
- A.
Interproximal caries
- B.
Proximal bone height
- C.
Fit of crowns
- D.
All of the above
Correct Answer
D. All of the above -
- 27.
The radiograph film is covered with an emulsion of
- A.
Silver bromide salts
- B.
Cellulose
- C.
Silver acetate
- D.
Potassium bromide
Correct Answer
A. Silver bromide salts -
- 28.
The raised button on the radiogph aids in
- A.
Processing
- B.
Drying
- C.
Mounting
- D.
Determining film speed
Correct Answer
C. Mounting -
- 29.
Film speed is determined by the
- A.
Amount of silver bromide salt
- B.
Thickness of cellulose acetate base
- C.
Size of the silver bromide crystal
- D.
Side of the film exposed
Correct Answer
C. Size of the silver bromide crystal -
- 30.
The best technique for reducing the radiation exposure to both patient and operator is the use of
- A.
An automatic timer
- B.
Fast film
- C.
Thinner films
- D.
A thicker cellulose acetate base
Correct Answer
B. Fast film -
- 31.
The most radiolucent structure of a tooth is the
- A.
Enamel
- B.
Dentin
- C.
Cementation
- D.
Pulp chamber
Correct Answer
D. Pulp chamber -
- 32.
The most radiopaque structure of the tooth is the
- A.
Enamel
- B.
Dentin
- C.
Cementation
- D.
Pulp chamber
Correct Answer
A. Enamel -
- 33.
To visualize the two roots on the maxillary first premolar the central ray should be directed.
- A.
Perpendicular to the buccal surface
- B.
Slightly from the mesial surface
- C.
Slightly from the distal surface
Correct Answer(s)
A. Perpendicular to the buccal surface
C. Slightly from the distal surface -
- 34.
The operator must avoid
- A.
Stray radiation
- B.
Secondary radiation
- C.
The primary beam
- D.
All of the above
Correct Answer
D. All of the above -
- 35.
The chemicals used in processing solutions are dissolved in
- A.
Cellulose acetate
- B.
Distilled water
- C.
A thick emulsion
- D.
Potassium bromide
Correct Answer
B. Distilled water -
- 36.
If an unexposed film is processed it will appear
- A.
White
- B.
Black
- C.
Blue
- D.
Clear
Correct Answer
D. Clear -
- 37.
Secondary radiation emanates from the
- A.
Patient mouth
- B.
Exposed film
- C.
Closed end of cone
- D.
All of the above
Correct Answer
D. All of the above -
- 38.
To avoid gonadal exposure to x ray which of the follwing may be used
- A.
Higher kvp
- B.
Lead apron
- C.
Finer detailed film
- D.
Increased vertical angulation
Correct Answer
B. Lead apron -
- 39.
When radiographs are taken of a pregnant patient
- A.
Periapical rather than bitewing films should be taken
- B.
Bitewing rather than periapical films should be taken
- C.
The patient should be treated as all other patients
- D.
As few film as possible should be taken
Correct Answer
C. The patient should be treated as all other patients -
- 40.
Who should hold the film in a patient's mouth if he or she is unable to do so
- A.
The dentist
- B.
The assistant
- C.
A friend or relative
- D.
The receptionist
Correct Answer
C. A friend or relative -
- 41.
When exposing a radiograph the operator should stand
- A.
Al least six feet from the xray head
- B.
Two feet to the right of the primary beam
- C.
Any distance in back of the xray head
- D.
Four feet in front of patient
Correct Answer
A. Al least six feet from the xray head -
- 42.
The maximum whole body dose cosidered permissible to those who work with radiation is
- A.
0.1 rem /wk
- B.
1 rem/wk
- C.
10 rems/wk
- D.
100rem/wk
Correct Answer
A. 0.1 rem /wk -
- 43.
The gratest danger to the operator is
- A.
The central ray
- B.
Secondary radiation
- C.
Primary x ray beam
- D.
All of the above are of equal danger
Correct Answer
D. All of the above are of equal danger -
- 44.
Which characteristic of xrays makes them both beneficial and hazardous?
- A.
They destroy tissue
- B.
They cause embolisms
- C.
They use the body's heat
- D.
They cause large fatty deposits to form
Correct Answer
A. They destroy tissue -
- 45.
A technique used to measure the operator 's exposure to radiation is
- A.
To check the color of the operator's fingers
- B.
For the operator to wear a radiation film badge
- C.
The frequency of stomach pains
- D.
To multiply the nunber of films the operator has exposed by 0.1 rem
Correct Answer
B. For the operator to wear a radiation film badge -
- 46.
A constant source of radiation is
- A.
Strontium 90
- B.
Natural elements
- C.
The sun
- D.
All of the above
Correct Answer
D. All of the above -
- 47.
The amount of radiation a person receives
- A.
Begings anew each day
- B.
Is cumulative only on the skin
- C.
Is cumulative in the entire body
- D.
None of the above
Correct Answer
C. Is cumulative in the entire body -
- 48.
Maximum protection of the patient requires that the xray beam pass though a (n)
- A.
Plastic closed ended cone
- B.
Shielded open ended cone
- C.
Water filter
- D.
Oil filter
Correct Answer
B. Shielded open ended cone -
- 49.
Occlusal films are used to determine
- A.
Mesiodistal orientation of a tooth
- B.
Buccal lingual orientation of a tooth
- C.
The presence of anterior caries
- D.
None of the above
Correct Answer
B. Buccal lingual orientation of a tooth -
- 50.
Small silver halide crystals on the film result in
- A.
More radiation to the patient
- B.
Better detail
- C.
Slower film
- D.
Faster film
- E.
Film fogging
Correct Answer(s)
A. More radiation to the patient
B. Better detail
C. Slower film -
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Mar 17, 2022Quiz Edited by
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Aug 07, 2010Quiz Created by
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