RHS Exam Study Guide

Reviewed by Editorial Team
The ProProfs editorial team is comprised of experienced subject matter experts. They've collectively created over 10,000 quizzes and lessons, serving over 100 million users. Our team includes in-house content moderators and subject matter experts, as well as a global network of rigorously trained contributors. All adhere to our comprehensive editorial guidelines, ensuring the delivery of high-quality content.
Learn about Our Editorial Process
| By Mondu192
M
Mondu192
Community Contributor
Quizzes Created: 1 | Total Attempts: 25,561
| Attempts: 25,738
SettingsSettings
Please wait...
  • 1/166 Questions

    Every patient should be evaluated individually for dental radiographs.

    • True
    • False
Please wait...
About This Quiz

Are you preparing for the Radiation Health and Safety (RHS) exam? Want to revise your concepts with this RHS Practice Test that is given here for free? Give it a try, and we assure you that you'll find this test very useful. The RHS exam is conducted by the Dental Assisting National Board (DANB) as a way for candidates to See moredemonstrate their expertise in the proper safety procedures for taking x-rays. If you think you know everything about this topic, then try the quiz given here.

RHS Exam Study Guide - Quiz

Quiz Preview

  • 2. 

    Dental film placed inside the mouth and used to examine the teeth and supporting structures is termed:

    • Duplicating film

    • Extraoral film

    • Intraoral film

    • None of the above

    Correct Answer
    A. Intraoral film
    Explanation
    Intraoral film is the correct answer because it refers to the dental film that is placed inside the mouth to examine the teeth and supporting structures. This type of film is commonly used in dental clinics for various diagnostic procedures such as detecting cavities, evaluating bone levels, and assessing the overall oral health of a patient. Duplicating film is used to create copies of radiographs, while extraoral film is used for imaging outside of the mouth, such as panoramic or cephalometric X-rays. Therefore, the correct term for the film used inside the mouth is intraoral film.

    Rate this question:

  • 3. 

    A film that is placed outside the mouth during x-ray exposure is termed

    • Extraoral film

    • Intraoral film

    • Duplicating film

    • Periapical

    Correct Answer
    A. Extraoral film
    Explanation
    An extraoral film is a type of dental film that is placed outside the mouth during x-ray exposure. It is used to capture images of the entire dental arch, including the teeth, jaws, and surrounding structures. This type of film is commonly used for panoramic radiographs, cephalometric radiographs, and cone beam computed tomography (CBCT) scans. In contrast, intraoral films are placed inside the mouth to capture detailed images of individual teeth and specific areas of the oral cavity. Duplicating film is used to make copies of radiographs, and periapical film is used to capture images of a specific tooth and its surrounding structures.

    Rate this question:

  • 4. 

    Changes secondary to caries, periodontal disease and trauma can be illustrated by dental radiographs

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Dental radiographs are a valuable tool in illustrating changes secondary to caries, periodontal disease, and trauma. Caries, or tooth decay, can be detected on radiographs by showing areas of demineralization or cavities. Periodontal disease, which affects the supporting structures of the teeth, can be visualized by radiographs showing bone loss or changes in the density of the alveolar bone. Trauma, such as fractures or dislocations, can also be seen on dental radiographs. Therefore, it is true that dental radiographs can be used to illustrate these changes.

    Rate this question:

  • 5. 

    Which of the following factors contributes to radiation injury?

    • Total dose

    • Dose rate

    • Cell sensitivity

    • Age

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    All of the factors listed (total dose, dose rate, cell sensitivity, and age) contribute to radiation injury. The total dose refers to the amount of radiation received, while the dose rate is the rate at which the radiation is delivered. Cell sensitivity refers to the susceptibility of cells to radiation damage, with some cells being more sensitive than others. Age also plays a role, as younger individuals are generally more sensitive to radiation compared to older individuals. Therefore, all of these factors contribute to the occurrence and severity of radiation injury.

    Rate this question:

  • 6. 

    Which of the following devices the restricts the size and shape of x-ray beam?

    • Filter

    • Collimator

    • Barrier

    • Film badge

    Correct Answer
    A. Collimator
    Explanation
    A collimator is a device that restricts the size and shape of an x-ray beam. It is used to control the direction and spread of the x-ray beam, ensuring that it only targets the desired area and reduces unnecessary exposure to surrounding tissues. This helps to improve image quality and reduce radiation dose to the patient. Filters, barriers, and film badges are not specifically designed to restrict the size and shape of the x-ray beam, making them incorrect options.

    Rate this question:

  • 7. 

    Which of the following film sizes is known as the standard film?

    • Size 0

    • Size 1

    • Size 2

    • Size 3

    Correct Answer
    A. Size 2
    Explanation
    Size 2 is known as the standard film size because it is the most commonly used film size in the industry. It is widely available and compatible with most cameras and projectors. Size 0 and size 1 are smaller film sizes typically used for specialized purposes, while size 3 is a larger format used for panoramic or wide-angle shots. Therefore, size 2 is considered the standard film size due to its widespread use and compatibility.

    Rate this question:

  • 8. 

    What does the acronym ALARA mean? 

    • As low as reasonably applicable

    • As low as reasonably accurate

    • As low as reasonably achievable

    • As low as reasonably able

    Correct Answer
    A. As low as reasonably achievable
    Explanation
    ALARA stands for "as low as reasonably achievable." This acronym is commonly used in fields such as radiation safety and environmental protection to emphasize the importance of minimizing exposure to potential hazards. It implies that efforts should be made to keep radiation or other risks as low as possible, taking into account technological and economic considerations. This principle helps guide decision-making processes and encourages the adoption of measures that effectively reduce risks to a level that is both practical and achievable.

    Rate this question:

  • 9. 

    The amount of radiation exposure an individual receives varies depending on: 

    • Film speed

    • Collimation

    • Technique

    • Exposure factors

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    The amount of radiation exposure an individual receives can vary depending on several factors. Film speed refers to the sensitivity of the film used, with faster films requiring less exposure time and therefore reducing radiation exposure. Collimation refers to the restriction of the x-ray beam to only the area of interest, minimizing exposure to surrounding tissues. Technique refers to the proper positioning and use of equipment, which can affect the amount of radiation received. Exposure factors are the settings chosen by the radiographer, such as kVp and mAs, which directly impact the amount of radiation exposure. Therefore, all of these factors can contribute to the variation in radiation exposure for an individual.

    Rate this question:

  • 10. 

    Which of the following is the recommended size of the beam at the patient's face? 

    • 2.75 in.

    • 3.25 in.

    • 3.50 in.

    • 4.00 in.

    Correct Answer
    A. 2.75 in.
    Explanation
    The recommended size of the beam at the patient's face is 2.75 in. This size is likely determined based on various factors such as the desired level of precision, the specific medical procedure being performed, and the comfort and safety of the patient. It is important to have a beam size that is appropriate for the specific application to ensure accurate and effective treatment or examination of the patient.

    Rate this question:

  • 11. 

    Film fogging results from improper safe lighting 

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Film fogging occurs when the film is exposed to light before or after it is developed. This can happen if the film is exposed to improper safe lighting conditions. Safe lighting is necessary to prevent the film from being exposed to light, which can cause fogging and ruin the image. Therefore, the statement "film fogging results from improper safe lighting" is true.

    Rate this question:

  • 12. 

    Portion of a processed radiograph that appears light or white is termed as _____. 

    • Radiolucent

    • Radiopaque

    • Dense

    • High density

    Correct Answer
    A. Radiopaque
    Explanation
    A portion of a processed radiograph that appears light or white is termed as radiopaque. Radiopaque refers to an area on the radiograph that is dense and does not allow the passage of X-rays, resulting in a white appearance. This can be caused by materials such as metal or bone, which absorb X-rays and prevent them from reaching the film or detector.

    Rate this question:

  • 13. 

    Which of the following is the largest intraoral film size? 

    • Size 4

    • Size 3

    • Size 2

    • Size 1

    Correct Answer
    A. Size 4
    Explanation
    Size 4 is the largest intraoral film size. Intraoral films are used in dental radiography to capture images of the teeth and surrounding structures. The film size refers to the physical dimensions of the film. Size 4 is larger than size 3, size 2, and size 1, making it the largest option. A larger film size allows for a wider area to be captured in a single image, which can be useful for capturing a full mouth or a panoramic view.

    Rate this question:

  • 14. 

    First step to manual film processing

    • Development

    • Rinsing

    • Fixation

    • Washing

    • Drying

    Correct Answer
    A. Development
    Explanation
    The first step in manual film processing is development. This involves placing the exposed film into a developer solution, which initiates a chemical reaction that converts the latent image on the film into a visible image. Development is crucial as it determines the overall contrast and density of the final image. Once the film has been developed, it can then proceed to the subsequent steps of rinsing, fixation, washing, and drying.

    Rate this question:

  • 15. 

    In manual film processing the optimal temperature for the developer solution is:

    • 55º F

    • 68º F

    • 78º F

    • 80º F

    • 90º F

    Correct Answer
    A. 68º F
    Explanation
    In manual film processing, the optimal temperature for the developer solution is 68º F. This temperature is considered ideal because it allows for proper chemical reactions to occur, resulting in accurate and high-quality film development. Higher temperatures can cause the developer solution to work too quickly, leading to overdevelopment and loss of detail. On the other hand, lower temperatures can slow down the development process, resulting in underdevelopment and poor image quality. Therefore, maintaining the developer solution at 68º F ensures optimal results in manual film processing.

    Rate this question:

  • 16. 

    A breakdown of chemicals in the processing solution that results from exposure to air is termed:

    • Reduction

    • Selective reduction

    • Oxidation

    • Replenishment

    • None of the above

    Correct Answer
    A. Oxidation
    Explanation
    Oxidation refers to the breakdown of chemicals in the processing solution that occurs due to exposure to air. When certain substances in the solution react with oxygen, they undergo oxidation, resulting in a chemical change. This process can lead to the formation of new compounds or the alteration of existing ones. In this case, oxidation is the correct answer as it accurately describes the phenomenon of chemical breakdown caused by air exposure.

    Rate this question:

  • 17. 

    Which of the following describes scatter radiation?

    • Radiation that exits the tubehead

    • Radiation that is more penetrating than primary radiation

    • Radiation that has been deflected from its path by interaction with matter

    • None of the above

    Correct Answer
    A. Radiation that has been deflected from its path by interaction with matter
    Explanation
    Scatter radiation refers to the radiation that has been deflected from its original path by interacting with matter. When X-rays pass through the patient's body, they can be scattered in different directions due to interactions with tissues and other objects. This scatter radiation can be harmful and can contribute to radiation exposure for both the patient and the healthcare provider. Therefore, it is important to take precautions to minimize scatter radiation during X-ray procedures.

    Rate this question:

  • 18. 

    An organ that, if damaged, diminishes the quality of an individual's life is termed a:

    • Critical organ

    • Somatic organ

    • Cumulative organ

    • Radioresistant organ

    • None of the above

    Correct Answer
    A. Critical organ
    Explanation
    A critical organ refers to an organ that, if damaged, significantly reduces the overall quality of life for an individual. This implies that the function of this organ is vital for the normal functioning and well-being of the individual. Damage to a critical organ can lead to severe health complications and limitations in daily activities, ultimately impacting the individual's overall quality of life.

    Rate this question:

  • 19. 

    The purpose of a lead foil sheet in the film packet is:

    • To protect the film from primary radiation

    • Protect film from saliva

    • Protect film from backscattered radiation

    • Distinguish between patient's left and right sides

    Correct Answer
    A. Protect film from backscattered radiation
    Explanation
    The purpose of a lead foil sheet in the film packet is to protect the film from backscattered radiation. Backscattered radiation refers to the radiation that is deflected or scattered back towards the film after interacting with the patient's body tissues. This can cause fogging or blurring of the image, reducing its clarity and diagnostic value. By placing a lead foil sheet in the film packet, it acts as a barrier, absorbing or blocking the backscattered radiation, thus protecting the film and ensuring a clear and accurate image.

    Rate this question:

  • 20. 

    An example of a radiopaque structure seen on a dental x-rays is 

    • Bone

    • Enamel

    • Dentin

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    All of the options listed (bone, enamel, dentin) are examples of radiopaque structures that can be seen on dental x-rays. Radiopaque structures appear white or light gray on the x-ray image because they absorb more x-ray radiation. Bone, enamel, and dentin are all dense structures that have a high degree of radiopacity, making them easily visible on dental x-rays.

    Rate this question:

  • 21. 

    Geometric characteristic that refers to a radiographic image that appears larger than its actual size is termed:

    • Distortion

    • Detail

    • Definition

    • Magnification

    Correct Answer
    A. Magnification
    Explanation
    Magnification refers to a geometric characteristic in radiographic imaging where the image appears larger than its actual size. This can occur due to factors such as the distance between the object and the image receptor or the focal spot size. Magnification can affect the accuracy and clarity of the image, making it important to minimize it for accurate diagnosis and measurements.

    Rate this question:

  • 22. 

    Unopened boxes of radiographic film should not be stored in darkroom because

    • Chemical fumes from processing solutions may fog the film

    • Continued exposure to the safelight is not recommended

    • The box may have a tear that may expose film

    • Processing solutions could splash onto the film boxes

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Unopened boxes of radiographic film should not be stored in the darkroom because there are multiple potential risks. Chemical fumes from processing solutions may fog the film, continued exposure to the safelight is not recommended, the box may have a tear that may expose the film, and processing solutions could splash onto the film boxes. Therefore, it is best to avoid storing unopened boxes of radiographic film in the darkroom to prevent any potential damage or contamination.

    Rate this question:

  • 23. 

    What does S.L.O.B. stand for?

    Correct Answer
    same lingual opposite buccal
    Explanation
    S.L.O.B. stands for "same lingual opposite buccal." This acronym is used in the field of dentistry and orthodontics to describe the positioning of teeth. "Same lingual" refers to teeth that are on the same side of the tongue, while "opposite buccal" refers to teeth that are on opposite sides of the cheeks. This terminology is used to describe the relationship between specific teeth in the mouth.

    Rate this question:

  • 24. 

    Portion of a processed radiograph that appears dark/black 

    • Dense

    • Radiolucent

    • Radiopaque

    • Transparent

    Correct Answer
    A. Radiolucent
    Explanation
    A radiolucent portion of a processed radiograph refers to an area that appears dark or black. This indicates that X-rays are able to pass through this area easily, suggesting that it is less dense or transparent to X-rays.

    Rate this question:

  • 25. 

    Which  of the following is PID's is most effective in reducing patient exposure?

    • Conical PID

    • Rectangular PID

    • Round PID

    • All are equally effective in reducing patient exposure

    Correct Answer
    A. Rectangular PID
    Explanation
    A rectangular PID (Position-Indicating Device) is the most effective in reducing patient exposure. This is because the rectangular shape allows for better collimation and focusing of the X-ray beam, resulting in a more precise and targeted exposure area. The conical and round PIDs may scatter the X-ray beam, increasing the risk of unnecessary radiation exposure to the patient. Therefore, the rectangular PID is the preferred choice for minimizing patient exposure.

    Rate this question:

  • 26. 

    Which of the following describes the function of filtration?

    • Increases scatter radiation

    • Increases divergent rays

    • Increases long wavelengths

    • Reduces low-energy waves

    Correct Answer
    A. Reduces low-energy waves
    Explanation
    Filtration is a process used in radiology to reduce low-energy waves, also known as soft radiation, from the X-ray beam. This is done by passing the X-ray beam through a filter made of a material that absorbs these low-energy waves. By reducing the amount of low-energy waves, filtration helps to improve image quality by reducing scatter radiation and increasing image contrast. It also helps to protect the patient from unnecessary radiation exposure.

    Rate this question:

  • 27. 

    Overall blackness or darkness of a dental radiograph is termed

    • Density

    • Contrast

    • Subject thickness

    • Diagnostic quality

    Correct Answer
    A. Density
    Explanation
    Density refers to the overall blackness or darkness of a dental radiograph. It is determined by the amount of radiation that reaches the film or sensor and is influenced by factors such as exposure time and kilovoltage settings. Higher density indicates a darker image, while lower density indicates a lighter image. Density is an important factor in determining the diagnostic quality of a radiograph as it affects the visibility and clarity of anatomical structures and pathologies.

    Rate this question:

  • 28. 

    Incorrect horizontal angulation results in images that are 

    • Elongated

    • Foreshortened

    • Overlapped

    • None of the above

    Correct Answer
    A. Overlapped
    Explanation
    Incorrect horizontal angulation refers to the incorrect positioning of the x-ray tube in relation to the object being imaged. This can result in overlapping of structures in the image, where different objects or anatomical features appear to be merged together. Therefore, the correct answer is "overlapped".

    Rate this question:

  • 29. 

    Which of the following statements is incrrect?

    • X-radiation is not harmful to living tissues

    • Dental radiographs benefit the patient

    • In dental radiography, the benefit of disease detection outweighs the risk of damage from radiation

    • Radiography should be prescribed only when the benefit outweighs the risk

    Correct Answer
    A. X-radiation is not harmful to living tissues
    Explanation
    The statement "x-radiation is not harmful to living tissues" is incorrect because x-radiation can indeed be harmful to living tissues. X-rays are a form of ionizing radiation, which means that they have enough energy to remove tightly bound electrons from atoms, causing damage to cells and DNA. While dental radiographs can provide benefits in terms of disease detection, it is important to recognize that there is still a risk associated with exposure to x-radiation. Therefore, it is essential to only prescribe radiography when the benefits outweigh the potential risks.

    Rate this question:

  • 30. 

    The indentification dot on the intraoral film is significant because:

    • The dot indicates the patient's right or left side

    • The dot determines film orientation

    • The dot is important in film mounting

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    The identification dot on the intraoral film is significant because it serves multiple purposes. Firstly, it indicates whether the film is placed on the patient's right or left side, which is crucial for accurate diagnosis and treatment planning. Secondly, the dot determines the correct orientation of the film, ensuring that the image is correctly aligned with the patient's anatomy. Lastly, the dot plays a vital role in film mounting, allowing the radiographs to be organized and interpreted properly. Therefore, all of the above statements are true.

    Rate this question:

  • 31. 

    Which of the following appears most radiolucent on a radiograph

    • Bone

    • Enamel

    • Dentin

    • Air space

    Correct Answer
    A. Air space
    Explanation
    Air space appears most radiolucent on a radiograph because it allows the X-rays to pass through easily, resulting in a darker area on the image. In contrast, bone, enamel, and dentin are denser and absorb more X-rays, appearing more radiopaque on the radiograph.

    Rate this question:

  • 32. 

    What year was the radiation control for health & safety act established

    • 1922

    • 1991

    • 1968

    • 1942

    Correct Answer
    A. 1968
    Explanation
    The Radiation Control for Health & Safety Act was established in 1968. This act was implemented to regulate the use of radiation and protect the health and safety of individuals from the harmful effects of radiation. It aimed to establish standards for the control of radiation sources, including medical devices and nuclear materials, and to ensure proper training and certification for individuals working with radiation. By setting guidelines and regulations, this act aimed to minimize the risks associated with radiation exposure and promote the safe use of radiation in various industries.

    Rate this question:

  • 33. 

    Which of the following electrons has the greatest binding energy?

    • N-shell electrons

    • M-Shell electrons

    • L-Shell electrons

    • K-Shell electrons

    Correct Answer
    A. K-Shell electrons
    Explanation
    The K-Shell electrons have the greatest binding energy because they are closest to the nucleus. The closer an electron is to the nucleus, the stronger the attractive force between the electron and the nucleus, resulting in a higher binding energy. As electrons move to higher energy shells, their distance from the nucleus increases, leading to a weaker attractive force and lower binding energy. Therefore, the K-Shell electrons have the highest binding energy compared to the other shells.

    Rate this question:

  • 34. 

    Identify the term that describes how dark  and light areas are differentiated on an image:

    • Contrast

    • Density

    • Intensity

    • Polychromatic

    Correct Answer
    A. Contrast
    Explanation
    Contrast refers to the difference in brightness between the light and dark areas of an image. It is the term used to describe how well the different elements in an image stand out from each other. By adjusting the contrast, the visual impact and clarity of an image can be enhanced, making it easier to distinguish between different objects and details.

    Rate this question:

  • 35. 

    Radiation injuries that are not seen in the person irradiated but that occur in future generations are termed

    • Somatic effects

    • Genetic effects

    • Cumulative effects

    • Short-term effects

    • Long-term effects

    Correct Answer
    A. Genetic effects
    Explanation
    Genetic effects refer to radiation injuries that may not be visible in the person who was directly exposed to radiation, but rather manifest in future generations. These effects are passed down through the genetic material and can result in mutations or genetic abnormalities in offspring. Unlike somatic effects, which are immediate and affect the exposed individual, genetic effects are long-term and can have lasting impacts on future generations. Cumulative effects, short-term effects, and long-term effects do not specifically pertain to the transmission of genetic damage.

    Rate this question:

  • 36. 

    Which of the following results if the intensifying screens are not in perfect contact with the screen film?

    • The screen may be damaged

    • The film may be damaged

    • Loss of image sharpness

    • None of the above

    Correct Answer
    A. Loss of image sharpness
    Explanation
    If the intensifying screens are not in perfect contact with the screen film, it can result in a loss of image sharpness. This is because the screens are responsible for emitting light that helps to expose the film, and if there is a gap or lack of contact, the light may not be evenly distributed on the film surface, leading to a blurry or less sharp image.

    Rate this question:

  • 37. 

    Which of the following is used to increase the voltage in the high-voltage circuit

    • Step-up transformer

    • Step-down transformer

    • Autotransformer

    • Step-up circuit

    Correct Answer
    A. Step-up transformer
    Explanation
    A step-up transformer is used to increase the voltage in a high-voltage circuit. It works by having more turns in the secondary coil than in the primary coil, which results in an increase in voltage. This is useful in various applications such as power transmission, where high voltage is required to minimize power loss over long distances.

    Rate this question:

  • 38. 

    In dental radiography, the quality of the x-ray beam is controlled by: 

    • KVp

    • MA

    • Exposure time

    • Source-to-receptor distance

    Correct Answer
    A. KVp
    Explanation
    The quality of the x-ray beam in dental radiography is controlled by kVp. kVp stands for kilovolt peak and refers to the peak voltage applied to the x-ray tube. It determines the energy level of the x-ray photons produced. Higher kVp values result in higher energy x-ray photons, which can penetrate the tissues more effectively and produce a better image quality. Therefore, adjusting the kVp allows the radiographer to control the contrast and penetration of the x-ray beam.

    Rate this question:

  • 39. 

    Radiation produced with high kilovoltage results in:

    • Short wavelengths

    • Long wavelengths

    • Less penetrating radiation

    • Lower energy levels

    Correct Answer
    A. Short wavelengths
    Explanation
    Radiation produced with high kilovoltage results in short wavelengths. This is because high kilovoltage leads to high energy levels in the radiation. According to the wave-particle duality of radiation, higher energy levels correspond to shorter wavelengths. Therefore, high kilovoltage produces radiation with short wavelengths.

    Rate this question:

  • 40. 

    The overall blackness or darkness of an image is termed:

    • Contrast

    • Density

    • Overexposure

    • Polychromatic

    Correct Answer
    A. Density
    Explanation
    Density refers to the overall blackness or darkness of an image. It is a measure of how much light is absorbed by an object or film. In the context of photography or radiography, density determines the visibility and clarity of details within an image. A higher density indicates a darker image, while a lower density indicates a lighter image. Therefore, density is the correct term to describe the overall blackness or darkness of an image.

    Rate this question:

  • 41. 

    A screen film is more sensitive to fluorescent light than to direct exposure to x-rays

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Screen films are commonly used in radiography to capture images of internal structures of the body. These films are designed to be more sensitive to fluorescent light emitted by intensifying screens, which are used to amplify the x-ray signal, than to direct exposure to x-rays. The intensifying screens emit light when struck by x-rays, and this light exposes the screen film, resulting in the formation of an image. Therefore, the statement that screen films are more sensitive to fluorescent light than to direct exposure to x-rays is true.

    Rate this question:

  • 42. 

    What size of receptor is used with the posterior XCP instrument? 

    Correct Answer
    size 2, size 2 receptor, 2
    Explanation
    The correct answer is size 2 receptor. The posterior XCP instrument is designed to be used with a specific size of receptor, and in this case, it is size 2. This size is appropriate for capturing images of the posterior teeth, which are located towards the back of the mouth. Using the correct size receptor ensures that the image quality is optimal and that the entire area of interest is captured.

    Rate this question:

  • 43. 

    Which of the following statements is incorrect?

    • X-rays travel at the speed of sound

    • X-rays have no charge

    • X-rays cannot be focused to a point

    • X-rays cause ionization

    Correct Answer
    A. X-rays travel at the speed of sound
    Explanation
    X-rays travel at the speed of light, not at the speed of sound. Sound waves require a medium to travel through, such as air, water, or solids, while X-rays are a form of electromagnetic radiation that can travel through a vacuum. Therefore, it is incorrect to say that X-rays travel at the speed of sound.

    Rate this question:

  • 44. 

    Identify the milliamperage range for dental radiography

    • 1 to 5 mA

    • 4 to 10 mA

    • 7 to 15 mA

    • Greater than 15 mA

    Correct Answer
    A. 7 to 15 mA
    Explanation
    The milliamperage range for dental radiography is typically between 7 to 15 mA. This range is necessary to produce enough radiation to capture clear and detailed images of the teeth and surrounding structures. Milliamperage is an important factor in determining the amount of radiation exposure, and this range ensures that the images are of high quality while minimizing the risk of excessive radiation exposure to the patient.

    Rate this question:

  • 45. 

    The sensitivity of tissues to radiation is determined by:

    • Mitotic activity

    • Cell differentiation

    • Cell metabolism

    • All of the above

    • None of the above

    Correct Answer
    A. All of the above
    Explanation
    The sensitivity of tissues to radiation is determined by all of the above factors. Mitotic activity refers to the rate at which cells divide, and tissues with higher mitotic activity are more sensitive to radiation. Cell differentiation refers to the specialization of cells into specific types, and undifferentiated cells are generally more sensitive to radiation. Cell metabolism refers to the chemical processes that occur within cells, and tissues with higher metabolic rates are more sensitive to radiation. Therefore, all of these factors contribute to the sensitivity of tissues to radiation.

    Rate this question:

  • 46. 

    The speed of a film is determined by the size of the silver halide crystals in the emulsion. Identify the true statement: 

    • The larger the crystals, faster the film speed

    • The larger the crystals, slower the film speed

    • The smaller the crystals, the faster the film speed

    • None of the above is correct

    Correct Answer
    A. The larger the crystals, faster the film speed
    Explanation
    The size of the silver halide crystals in the emulsion determines the speed of a film. Larger crystals allow more light to be captured, resulting in a faster film speed. This is because larger crystals have a greater surface area, allowing them to react more quickly to light. Therefore, the statement "the larger the crystals, faster the film speed" is true.

    Rate this question:

  • 47. 

    Thyroid collar must be worn for both intraoral and extraoral exposures. 

    • True

    • False

    Correct Answer
    A. True
    Explanation
    A thyroid collar or thyroid apron should be used during panoramic X-rays (panoramic radiographs) to protect the thyroid gland from radiation exposure.

    Rate this question:

  • 48. 

    What type of electrical charge does the electron carry

    • Positive charge

    • Negative charge

    • No charge

    • Positive or negative charge

    Correct Answer
    A. Negative charge
    Explanation
    The electron carries a negative charge because it has a surplus of negatively charged particles called electrons. These electrons are attracted to positively charged particles and repel other negatively charged particles, indicating that the electron itself has a negative charge.

    Rate this question:

  • 49. 

    Dental radiography may hold a receptor in the patient's mouth to ensure diagnostic image.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The statement is false because dental radiography does not require holding a receptor in the patient's mouth. Instead, dental radiography uses X-ray machines to capture images of the teeth and jaw. The patient bites down on a small film or sensor placed outside the mouth to capture the X-ray image. This method is commonly used in dental clinics to diagnose dental issues and assess oral health.

    Rate this question:

Quiz Review Timeline (Updated): Feb 6, 2025 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Feb 06, 2025
    Quiz Edited by
    ProProfs Editorial Team
  • Aug 18, 2013
    Quiz Created by
    Mondu192

Recent Quizzes

Dental Assisting National Board Quiz Dental Assisting National Board Quiz
C4 OHP - Periodontal disease & tooth wear C4 OHP - Periodontal disease & tooth wear
Spec 1 Tutorial for Resit - C3 DA Spec 1 Tutorial for Resit - C3 DA
Advertisement
×

Wait!
Here's an interesting quiz for you.

We have other quizzes matching your interest.