Radtech Simulation Examination 2
This is your Radtec Simulation Exam 2 for HAAD,
this is taken from the last month's exam
you have 120 minutes to finish 100 items
you need 70% to pass
Answers are at the last page so DON'T EXIT IMMEDIATELY
PLEASE MAKE SURE THAT YOU HAVE A STRONG INTERNET CONNECTION
- 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. LeadExplanation
Lead is the most resistant material to X radiation because it has a high atomic number and density, which enables it to effectively absorb and attenuate X-ray radiation. Lead is commonly used as a shielding material in X-ray rooms and equipment to protect against radiation exposure. Its dense structure allows it to absorb a significant amount of X-ray energy, reducing the risk of radiation damage to surrounding areas. Copper, molybdenum, tungsten, and aluminum are less resistant to X radiation compared to lead.Rate this question:
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- 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 aboveExplanation
The intensity of the beam is affected by the kilovolt peak, milliamperage, exposure time, and focal film distance. Kilovolt peak determines the quality of the x-ray beam, with higher peak values resulting in greater penetration. Milliamperage controls the quantity of x-rays produced, with higher values increasing the number of x-rays. Exposure time determines the duration of x-ray exposure, with longer times resulting in more x-rays. Focal film distance affects the sharpness of the image, with shorter distances producing sharper images. Therefore, all of these factors affect the intensity of the beam.Rate this question:
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- 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. 60Explanation
In a dental x-ray machine operating on alternating current, the polarity is reversed 60 times per second. Alternating current continuously changes direction, and the frequency at which it alternates is measured in hertz (Hz). In this case, the frequency is 60 Hz, indicating that the polarity is reversed 60 times per second. This rapid reversal of polarity allows the x-ray machine to generate the necessary electrical energy to produce x-rays for dental imaging.Rate this question:
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- 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. 60Explanation
X-ray timers calibrated in impulses measure the number of impulses that occur in a given time period. In this case, the question is asking how many impulses are there in a second. The correct answer is 60, indicating that there are 60 impulses in one second.Rate this question:
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- 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 imageExplanation
The use of a 16 inch cylinder in the paralleling technique helps to avoid magnification of the image. This is because the cylinder allows for a more accurate and consistent positioning of the x-ray tube and the image receptor, reducing the chances of distortion or enlargement of the anatomical structures being imaged. By keeping the distance between the x-ray tube and the image receptor constant, the cylinder helps to produce a more accurate representation of the size and proportions of the structures being examined.Rate this question:
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- 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 radiationExplanation
The use of a kilovolt peak between 45-65 produces scatter radiation. Scatter radiation refers to the radiation that is deflected or scattered in different directions when it interacts with an object. In medical imaging, scatter radiation can cause problems such as fogging, which is the unwanted exposure of the film or image receptor. It can also result in a blurred image or an underexposed film. Therefore, the correct answer is scatter radiation.Rate this question:
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- 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. ContrastExplanation
Contrast refers to the difference in degrees of blackness on a radiograph. It is a measure of how much the different structures in the image stand out from one another. Higher contrast means a greater difference in blackness between adjacent areas, while lower contrast means a smaller difference. By adjusting the contrast, radiographers can enhance the visibility of certain structures or abnormalities in the image.Rate this question:
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- 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 divergentExplanation
A long FFD (focus-to-film distance) is desirable because the central rays of the primary beam are less divergent. This means that the X-ray beam remains more focused and concentrated as it travels from the X-ray tube to the object being imaged. As a result, the image produced is sharper and more detailed. A shorter FFD would cause the central rays to diverge more, leading to a loss of image clarity and resolution.Rate this question:
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- 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 viewboxExplanation
The correct answer is "on a viewbox." Radiographs should always be viewed on a viewbox because it provides the optimal lighting conditions for accurately interpreting the images. A viewbox is specifically designed to provide uniform and consistent illumination, allowing the dental professional to properly assess the details and nuances of the radiographs. This ensures accurate diagnosis and treatment planning. Viewing radiographs in a well-lit room, in the operatory, or by holding them up to a ceiling light or using light from a window may result in uneven lighting, shadows, or glare, which can hinder the interpretation of the images.Rate this question:
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- 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. 3Explanation
The intensity of a beam of radiation decreases as the distance from the target increases. In this case, the intensity is given as 12 at a distance of 12 inches. Since the distance doubles to 24 inches, the intensity will decrease by a factor of 2. Therefore, the intensity of the beam at 24 inches is 6.Rate this question:
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- 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 waterExplanation
Soapy water is the best way to clean the intensifying screens in extraoral cassettes because it is gentle yet effective in removing dirt, dust, and debris from the screens. It is also safe to use and does not cause damage to the screens. Detergent, disinfectant solution, and cold sterilizing solution may be too harsh and can potentially damage the screens. A wire brush is not recommended as it can scratch the screens.Rate this question:
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- 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 sourcesExplanation
Film fog can occur when there is an imbalance or exhaustion of processing solutions, a light leak, or improper safelighting. Any of these factors can lead to the radiograph becoming darkened. Therefore, all of the options mentioned in the answer are potential sources of film fog.Rate this question:
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- 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.Explanation
The statement "if less film density is needed on the duplicate radiograph the exposure time is shortened" is false. In film duplication, if less film density is needed on the duplicate radiograph, the exposure time should be increased, not shortened. This is because reducing the exposure time would result in an underexposed duplicate radiograph with lower film density.Rate this question:
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- 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 unitsExplanation
Flexible cassettes are used in some panoramic units. This implies that not all panoramic units use flexible cassettes, but some do. The reason for this could be the potential cracking of the emulsion. Flexible cassettes are more prone to damage and may not be suitable for all panoramic units. Therefore, some units opt for other types of cassettes that are more durable and less likely to cause issues with the emulsion.Rate this question:
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- 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 aboveExplanation
Intraoral film packets must be resistant to salivary seepage to prevent any moisture from affecting the quality of the film. They should also be flexible to comfortably fit inside the patient's mouth during imaging. Additionally, they need to be light tight to prevent any unwanted exposure to light that could ruin the film. Lastly, they should be easy to open in the darkroom to ensure efficient and smooth workflow. Therefore, all of the given options are necessary for intraoral film packets.Rate this question:
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- 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 radiationExplanation
Film speed refers to the sensitivity of a film to x radiation. This means that a higher film speed indicates a greater sensitivity to x radiation, allowing the film to capture more detail in low-light conditions or with shorter exposure times. Conversely, a lower film speed indicates a lower sensitivity to x radiation, requiring longer exposure times or more intense radiation to produce a properly exposed image.Rate this question:
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- 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 exposureExplanation
A film that has emulsion on both sides requires less radiation exposure because the emulsion on both sides allows for more efficient capture of radiation. This means that a lower amount of radiation is needed to produce a clear and accurate image on the film.Rate this question:
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- 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#2Explanation
In the context of film sizes, the term "standard adult film" refers to the commonly used or widely accepted size for adult films. Among the options given, size #2 is considered to be the standard adult film size.Rate this question:
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- 19.
Nonscreen film is routinely used in extraoral radiography
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement is false because nonscreen film is not routinely used in extraoral radiography. In extraoral radiography, screen film is commonly used as it provides better image quality and reduces radiation exposure to the patient. Nonscreen film, on the other hand, is used in intraoral radiography where the film is placed inside the mouth.Rate this question:
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- 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 exposureExplanation
The advantage of a film that has emulsion on both sides is that it requires less radiation exposure. This is because the emulsion on both sides increases the film's sensitivity to radiation, allowing it to capture more detail with less exposure.Rate this question:
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- 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 screenExplanation
A calcium tungstate screen is used as an intensifying screen that emits blue light and must be used with film that is sensitive to blue light. The calcium tungstate screen contains phosphors that emit blue light when exposed to radiation, helping to enhance the sensitivity of the film and improve image quality. This type of screen is commonly used in radiography to produce clearer and more detailed X-ray images.Rate this question:
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- 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 screenExplanation
The device that converts X-ray energy into visible light is called an intensifying screen. Intensifying screens are used in conjunction with X-ray film to amplify the amount of light reaching the film, thereby reducing the amount of radiation required for imaging. This helps to minimize patient exposure to radiation while still producing a clear and diagnostic image.Rate this question:
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- 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 aboveExplanation
The correct answer is "all of the above." Intraoral film packets need to be resistant to salivary seepage to prevent contamination and maintain image quality. They also need to be flexible to conform to the shape of the mouth for comfortable positioning. Being light tight is important to prevent exposure to light, which can damage the film. Lastly, they should be easy to open in the darkroom to facilitate efficient processing.Rate this question:
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- 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 sharpnessExplanation
If the intensifying screens are not in perfect contact with the film, there will be a loss of image sharpness. This is because the screens are designed to amplify the light reaching the film, and if there is a gap between the screens and the film, some of the light will be scattered or lost, resulting in a decrease in image sharpness.Rate this question:
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- 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 patientExplanation
Using the fastest speed film and high kilovolt peak reduces the radiation exposure to the patient. This is because the fast film requires less radiation to produce a properly exposed image, and the high kilovolt peak allows for better penetration of the X-rays through the patient's body. As a result, the patient is exposed to less radiation during the imaging process, which is advantageous for their overall health and safety.Rate this question:
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- 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 beamExplanation
The primary beam refers to the main beam of radiation that is directed towards the patient during dental radiography. This beam contains the highest dose of radiation and is responsible for capturing the images of the patient's jaw. Therefore, the greatest dose of radiation to structures in the patient's jaw comes from the primary beam.Rate this question:
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- 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 orbitExplanation
Ionization occurs when an electron is displaced from its orbit. This process can happen when an atom or molecule gains or loses an electron, resulting in the formation of charged particles called ions. The displacement of an electron from its orbit leads to the creation of ions, which can have various effects such as cell death, penetration of photons through matter, or conversion of radiant energy to heat. Therefore, the correct answer is that ionization occurs when an electron is displaced from its orbit.Rate this question:
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- 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 raysExplanation
Gamma rays are a form of high-energy electromagnetic radiation that can cause ionization of atoms. When gamma rays interact with atoms, they can knock off electrons from the atoms, creating ions. This ionization process can have various effects, including damaging living tissues and causing genetic mutations. Therefore, gamma rays are known for their ability to cause ionization of atoms.Rate this question:
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- 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 radiationExplanation
The ALARA principles refer to obtaining diagnostically acceptable radiographs with minimal exposure to radiation. This means that healthcare professionals should strive to take X-rays that provide the necessary diagnostic information while minimizing the amount of radiation exposure to the patient. This principle emphasizes the importance of balancing the need for accurate imaging with the potential risks associated with radiation. By following the ALARA principles, healthcare providers can ensure that patients receive the necessary radiographs while prioritizing their safety.Rate this question:
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- 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 speedExplanation
X-rays, gamma rays, light, and microwaves all travel at the same speed, which is the speed of light in a vacuum. This speed is approximately 299,792,458 meters per second. According to the theory of relativity, the speed of light is a constant and does not vary depending on the type of wave or particle. Therefore, all the options listed in the question travel at the same maximum speed.Rate this question:
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- 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 wavelengthsExplanation
X-rays with long wavelengths are more likely to be absorbed by the skin. This is because longer wavelength x-rays have lower energy levels compared to shorter wavelength x-rays. When x-rays interact with matter, they can be absorbed, scattered, or pass through depending on their energy level. X-rays with longer wavelengths have lower energy and are more likely to be absorbed by the skin, while x-rays with shorter wavelengths have higher energy and can penetrate deeper into the body. Therefore, x-rays with long wavelengths are the most likely to be absorbed by the skin.Rate this question:
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- 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 everywhereExplanation
Background radiation refers to the constant low-level radiation that is present in the environment from natural and human-made sources. It is found everywhere because it is emitted from various sources such as rocks, soil, water, and even outer space. This radiation cannot be completely avoided as it is a natural part of our surroundings. While it is important to minimize exposure to radiation, background radiation is always present to some extent, regardless of an individual's caution or location. Therefore, the statement "it is found everywhere" is the most accurate description of background radiation.Rate this question:
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- 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. ComptonExplanation
Compton scatter radiation occurs most often with dental x-rays. Compton scatter is a type of interaction between x-rays and matter in which the x-ray photon transfers some of its energy to an outer-shell electron, causing it to be ejected from its orbit. This scattered photon then changes direction and may hit other structures, potentially causing image degradation. This type of scatter radiation is more common in dental x-rays due to the small size and high density of the structures being imaged, which increases the likelihood of scattering interactions.Rate this question:
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- 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. SievertExplanation
Under the new metric system for measuring dose in the International System of Units (SI), the rem unit has been replaced by the sievert. The sievert is the unit used to measure the biological effect of ionizing radiation on the human body. It takes into account the type of radiation and the sensitivity of different tissues and organs. The sievert is considered a more accurate and comprehensive measurement of radiation dose compared to the rem.Rate this question:
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- 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 patientsExplanation
In recent years, there has been a growing concern about the potential of ionizing radiation used in dentistry to induce cancer in patients. This is because ionizing radiation has the ability to damage DNA and other cellular structures, which can lead to the development of cancerous cells. While the other options may also be of concern, such as somatic damage to the patient, occupational exposure of dental workers, genetic damage to patients, and its contribution to background radiation, the focus has primarily been on the potential risk of cancer induction in patients.Rate this question:
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- 36.
The penetrating power of xrays depend on
- A.
Kvp
- B.
Ma
- C.
Film speed
- D.
Focal film distance
Correct Answer
A. KvpExplanation
The penetrating power of X-rays depends on kvp (kilovolt peak). The kvp determines the energy level of the X-rays, with higher kvp values resulting in more penetrating X-rays. This is because higher kvp values increase the speed and force with which electrons strike the anode, resulting in the production of X-rays with greater energy and penetration capabilities. Therefore, kvp is a crucial factor in determining the ability of X-rays to pass through different materials and produce clear images.Rate this question:
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- 37.
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 inchesExplanation
The correct answer is 2.75 to 3.00 inches. This range represents the size of the collimated beam for intraoral radiology measured at the patient's skin. It is important to have a properly collimated beam to ensure accurate and focused imaging while minimizing unnecessary radiation exposure to the patient. A beam size within this range allows for adequate coverage of the area of interest while avoiding excessive radiation scatter.Rate this question:
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- 38.
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 beamExplanation
Filtration of the x-ray beam protects the patient by eliminating weak wavelength x-rays from the x-ray beam. Weak wavelength x-rays have lower energy and are more likely to be absorbed by the patient's body, leading to unnecessary radiation exposure. By eliminating these weak wavelength x-rays, the filtration ensures that only higher energy x-rays, which are more penetrating and essential for imaging, reach the patient. This reduces the patient's radiation dose and increases the safety of the procedure.Rate this question:
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- 39.
The most penetrating xrays have
- A.
Low frequencies
- B.
Soft rays
- C.
Long wavelengths
- D.
Long wavelengths
- E.
Short wavelengths
Correct Answer
E. Short wavelengthsExplanation
Short wavelengths are associated with high energy and high frequency. X-rays are a form of electromagnetic radiation with very short wavelengths, making them highly penetrating. This allows them to pass through most substances, including body tissues, making them useful for medical imaging and other applications. Therefore, the answer "short wavelengths" is correct.Rate this question:
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- 40.
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 rayExplanation
The correct answer is "central ray". The central ray refers to the x-ray that is located at the center of the primary beam. It is the most focused and intense part of the x-ray beam, and it is responsible for producing the clearest and most detailed image. The central ray is crucial in diagnostic imaging as it provides the most accurate representation of the patient's anatomy.Rate this question:
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- 41.
The housing of the xray tube is
- A.
Copper
- B.
Plastic
- C.
Tungsten
- D.
Glass
Correct Answer
B. PlasticExplanation
The housing of the x-ray tube is made of plastic because plastic is a good insulator and can effectively protect the delicate internal components of the tube from external electrical interference. Additionally, plastic is lightweight and easy to mold, making it a practical choice for the housing material.Rate this question:
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- 42.
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 distortionExplanation
As the target film distance is increased, the chance of distortion decreases. This is because when the distance between the target and the film is increased, the angle at which the image is projected onto the film becomes more perpendicular, resulting in less distortion. Distortion is more likely to occur when the target film distance is shorter, as the angle of projection becomes more oblique, causing stretching or warping of the image. Therefore, increasing the target film distance reduces the likelihood of distortion.Rate this question:
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- 43.
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 angulationExplanation
Overlapping in dental radiographs refers to the superimposition of anatomical structures, which can make it difficult to interpret the image accurately. Incorrect horizontal angulation refers to the improper alignment of the x-ray beam and the film, causing overlapping. This misalignment can result in the overlapping of structures that should be separated, leading to an unclear image. Therefore, the correct answer is incorrect horizontal angulation.Rate this question:
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- 44.
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. FourfoldExplanation
When the target film distance is doubled after the film is exposed, the intensity of the light reaching the film decreases by a factor of four (inverse square law). To compensate for this decrease in intensity, the exposure time needs to be increased by a factor of four as well. Therefore, the exposure time necessary to obtain a second film of equal density to the first film is fourfold.Rate this question:
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- 45.
Wich cells are the most sensitive to xrays?
- A.
Muscle
- B.
Nerve
- C.
Sperm
- D.
Epithelial
Correct Answer
C. SpermExplanation
Sperm cells are the most sensitive to X-rays because they are rapidly dividing cells and have a high rate of DNA replication. X-rays can cause damage to the DNA, leading to mutations and impairing the ability of sperm cells to fertilize an egg. This sensitivity to X-rays is why radiation is often used as a form of contraception or sterilization.Rate this question:
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- 46.
Which cells are the least sensitive to x rays?
- A.
Ova
- B.
Blood
- C.
Sperm
- D.
Nerve
Correct Answer
D. NerveExplanation
Nerve cells are the least sensitive to X-rays because they have a lower metabolic rate compared to other cells. This lower metabolic rate makes them less susceptible to damage from ionizing radiation, such as X-rays. Additionally, nerve cells have a protective covering called the myelin sheath, which further reduces their sensitivity to X-rays.Rate this question:
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- 47.
The first sign of x ray dermatitis is
- A.
Loss of hair
- B.
Purulent exudate
- C.
Erythema
- D.
Pain
Correct Answer
C. ErythemaExplanation
Erythema is the correct answer because it refers to redness of the skin, which is a common early sign of x-ray dermatitis. This condition occurs when the skin is exposed to high levels of radiation, causing inflammation and damage to the skin cells. Erythema typically appears within a few hours to days after exposure and can be accompanied by other symptoms such as itching or burning sensation. It is an important indicator for diagnosing and monitoring the progression of x-ray dermatitis.Rate this question:
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- 48.
Scatter radiation is a type of
- A.
Secondary radiation
- B.
Primary radiation
- C.
Stray radiation
- D.
None of the above
Correct Answer
A. Secondary radiationExplanation
Scatter radiation refers to the type of radiation that occurs when primary radiation interacts with matter and changes direction. It is called secondary radiation because it is produced as a result of the interaction of primary radiation with the material it encounters. Therefore, the correct answer is secondary radiation.Rate this question:
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- 49.
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 foggingExplanation
The lead foil in the x-ray film packet is used to stop unused radiation and prevent film fogging. Lead is a dense material that is effective in absorbing radiation, so the lead foil acts as a barrier to block any stray or scattered radiation from reaching the film. This helps to ensure that only the desired x-ray image is captured on the film, reducing the risk of overexposure and maintaining image quality. Additionally, the lead foil helps to prevent fogging of the film by blocking out any external sources of radiation that could cause unwanted exposure.Rate this question:
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- 50.
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 radiationExplanation
Secondary radiation refers to the radiation that is produced as a result of the interaction of primary radiation with matter. It can be in the form of scattered or secondary photons, as well as secondary particles such as electrons or protons. The quality or penetrating power of radiation refers to its ability to penetrate through matter. Primary radiation, being the initial radiation, typically has higher energy and thus greater penetrating power compared to secondary radiation. Therefore, the correct answer is that the quality or penetrating power of secondary radiation is less than that of primary radiation.Rate this question:
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Current Version
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Mar 22, 2023Quiz Edited by
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Sep 11, 2015Quiz Created by
Untalancy
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