Radiology 5
- 1.
Which of the following materials is most resistant to x radiation?
- A.
Copper
- B.
Molybdenum
- C.
Tungsten
- D.
Lead
- E.
Aluminum
Correct Answer
D. Lead -
- 2.
The intensity of the beam is affected by the
- A.
Kilovolt peak
- B.
Milliamperage
- C.
Exposure time
- D.
Focal film distance
- E.
All of the above
Correct Answer
E. All of the above -
- 3.
How many times per second is the polarity reversed in a dental xray machine operating on an alternating current?
- A.
30
- B.
15
- C.
60
- D.
45
Correct Answer
C. 60 -
- 4.
For x ray timers calibrated in impulses how many impulses are there in a second?
- A.
10
- B.
30
- C.
60
- D.
120
- E.
15
Correct Answer
C. 60 -
- 5.
In 16 inch cylinder is used in the paralleling technique to
- A.
Reduce secondary radiation
- B.
Avoid magnification of the image
- C.
Avoid distortion of the image
- D.
Avoid superimposition of anatomic structures
- E.
Facilitate correct vertical angulation of the position indicating device pid
Correct Answer
B. Avoid magnification of the image -
- 6.
Use of a kilovolt peak between 45 65 profuces
- A.
Scatter radiation
- B.
Fogging
- C.
A blurred image
- D.
An underexposed film
- E.
None of the above
Correct Answer
A. Scatter radiation -
- 7.
The difference in degrees of blackness on a radiograph is called
- A.
Density
- B.
Tone
- C.
Contrast
- D.
Fogging
- E.
Shades
Correct Answer
C. Contrast -
- 8.
A long FFD is desirable because
- A.
More radiation is absorbed by the tissues
- B.
The resulting radiation is more penetrating
- C.
More soft radiation strikes the object
- D.
The central rays of the primary beam are less divergent
- E.
Overexposure rarely occurs
Correct Answer
D. The central rays of the primary beam are less divergent -
- 9.
Radiographs should always be viewed
- A.
In a well lit room
- B.
On a viewbox
- C.
In the operatory
- D.
By holding them up to a celling light
- E.
Using hight from a window
Correct Answer
B. On a viewbox -
- 10.
If the intensity of a beam of radiation is 12 at a point 12 inches from the target the intensity of the beam at 24 inches is
- A.
2
- B.
3
- C.
4
- D.
5
- E.
6
Correct Answer
B. 3 -
- 11.
The best way to clean the intensifying screens in extraoral cassettes is with
- A.
Detergent
- B.
Disinfectant solution
- C.
Cold sterillizing solution
- D.
Soapy water
- E.
A wire brush
Correct Answer
D. Soapy water -
- 12.
Film fog occurs when all or part of a radiograph is darkened by
- A.
An imbalance or exhaustion of processing solutions
- B.
A light leak
- C.
Improper safelighting
- D.
Improper safelilghting
- E.
All of the above are potential sources
Correct Answer
E. All of the above are potential sources -
- 13.
Which of the following statement is false concerning film duplication?
- A.
The films to be duplicated are in close contact with the duplicating film.
- B.
The shiny side of the film is the nonemulsion side
- C.
If less film density is needed on the duplicate radiograph the exposure time is shortened.
- D.
The raised portion of the orientation dot faces toward the light source
- E.
The radiographs being duplicated should be removed from their respective mounts.
Correct Answer
C. If less film density is needed on the duplicate radiograph the exposure time is shortened. -
- 14.
Flexible cassettes are
- A.
Not used because of cracking of the emulsion
- B.
Are used in all panoramic units
- C.
Are used in some panoramic units
- D.
Are used for lateral oblique projections only
- E.
None of the above
Correct Answer
C. Are used in some panoramic units -
- 15.
Intraoral film packets must be
- A.
Resistant to salivary seepage
- B.
Flexible
- C.
Light tight
- D.
Easy to open in the darkroom
- E.
All of the above
Correct Answer
E. All of the above -
- 16.
To what does the term film speed refer?
- A.
The developing time needed
- B.
Sensitivity to x radiation
- C.
Half life
- D.
Degree of blackness on the exposed radiograph
- E.
Shelf life
Correct Answer
B. Sensitivity to x radiation -
- 17.
The advantage of a film that has emulsion on both sides is that
- A.
The film requires less radiation exposure
- B.
The image produced is less distorted
- C.
The film has less sensitivity to radiation
- D.
Processing solutions work better
- E.
The film is easier to mount
Correct Answer
A. The film requires less radiation exposure -
- 18.
Which of the following film sizes is considered to be standard adult film?
- A.
Size#0
- B.
Size#1
- C.
Size#2
- D.
Size#3
- E.
Size#4
Correct Answer
C. Size#2 -
- 19.
Nonscreen film is routinely used in extraoral radiography
- A.
True
- B.
False
Correct Answer
B. False -
- 20.
The advantage of a film that has emulsion on both sides is that
- A.
The film requires less radiation exposure
- B.
The image produced is less distorted
- C.
The film has less sensitivity to radiation
- D.
Processing solutions work better
- E.
The film is easier to mount
Correct Answer
A. The film requires less radiation exposure -
- 21.
The intensifying screen that emits blue light and must be used with film that is sensitive to blue light is a
- A.
Nonlight screen
- B.
Calcium tungstate screen
- C.
Rare tungstate screen
- D.
Rare earth screen
- E.
Phosphor calcium screem
Correct Answer
B. Calcium tungstate screen -
- 22.
The device that converts x ray energy into visible light is called a(n)
- A.
Cassette holder
- B.
Step down transformer
- C.
Intensitying screen
- D.
Nonscreen film
- E.
Screen film
Correct Answer
C. Intensitying screen -
- 23.
Intraoral film packets must be
- A.
Resistant to salivary seepage
- B.
Flexible
- C.
Light tihgt
- D.
Easy to open in the darkroom
- E.
All of the above
Correct Answer
E. All of the above -
- 24.
If the intensitying screens are not in perfect contact with the film which of the following will occur?
- A.
The screen may be damaged
- B.
The film may be damaged
- C.
There will be a light leak
- D.
There will be a loss of image sharpness
- E.
A thin film will result
Correct Answer
D. There will be a loss of image sharpness -
- 25.
What is the major advantage in using the fastest speed film and high kilovolt peak?
- A.
It increases film density
- B.
It increases film contrast
- C.
It produces a clearer image
- D.
It reduces the radiation exposure to the patient
- E.
It makes film easier and faster to develop
Correct Answer
D. It reduces the radiation exposure to the patient -
- 26.
In taking dental radiographs the greatest dose of radiation to structures in the patient jaw comes from
- A.
The primary beam
- B.
Leakage from the xray machine
- C.
Scatter from the patient face
- D.
Scatter from the pid
- E.
Secondary radiation
Correct Answer
A. The primary beam -
- 27.
Ionization has occurred when
- A.
Cell death occurs
- B.
Photons penetrate matter
- C.
Radiant energy is converted to heat
- D.
An electron is displaced from its orbit
- E.
None of the above
Correct Answer
D. An electron is displaced from its orbit -
- 28.
Which form of radiation can cause ionization of atoms?
- A.
Radar
- B.
Microwaves
- C.
Radio waves
- D.
Visible light
- E.
Gamma rays
Correct Answer
E. Gamma rays -
- 29.
The ALARA principles refers to
- A.
Obtaining informed consent
- B.
The disinfection procedures recommended in dental radiography
- C.
Obtaining diagnostically acceptable radiographs with minimal exposure to radiation
- D.
Decreasing the processing time for exposed radiographs
- E.
None of above
Correct Answer
C. Obtaining diagnostically acceptable radiographs with minimal exposure to radiation -
- 30.
Which of the following travel at the greatest speed?
- A.
X ray
- B.
Gamma rays
- C.
Light
- D.
Microwaves
- E.
They all travel at the same speed
Correct Answer
E. They all travel at the same speed -
- 31.
X rays that are most likely to be absorbed by the skin are
- A.
Those with a short wavelength
- B.
Aluminum filtered rays
- C.
Those with ling wavelengths
- D.
High energy waves
- E.
Sonic waves
Correct Answer
C. Those with ling wavelengths -
- 32.
Which of the following statements cocerning background radiation is most accurate?
- A.
It gives us the maximum recommended dosage for radiation exposure
- B.
It can be avoided if an individual is cautious
- C.
It is found everywhere
- D.
It is only present in dental offices and medical facilities
- E.
None of the above are correct
Correct Answer
C. It is found everywhere -
- 33.
Which of the following types of scatter radiation occurs most often with dental x rays
- A.
Thompson
- B.
Compton
- C.
Photoelectric
- D.
Coherent
- E.
All of the above occur equally with dental x rays
Correct Answer
B. Compton -
- 34.
Under the new metric system for measuring dose SI the rem replaced by the
- A.
Rad
- B.
Gray
- C.
Sievert
- D.
Becquerel
- E.
Curie
Correct Answer
C. Sievert -
- 35.
In recent years the focus of prime concern from the effects of ionizing radiation used in dentistry has centered on
- A.
Somatic damage to the patient
- B.
Occupational exposure of dental workers
- C.
Genetic damage to patients
- D.
Cancer induction in patients
- E.
Its contribution to background radiation
Correct Answer
D. Cancer induction in patients -
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Jan 17, 2013Quiz Edited by
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Aug 10, 2010Quiz Created by
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