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RHS exam: Questions with 100% Correct
Answers | Updated & Verified | 2025
Which of the following radiolucent landmarks is useful when mounting films in the mandibular anterior area? - ✔✔Lingual Foramen According to the inverse square law, when changing the PID length from 8 to 16 inches, the beam's intensity is - ✔✔1/4 as intense Patients should wear a thyroid collar during which type of radiographic exposure? - ✔✔Intraoral radiograph Personnel radiation monitoring devices are worn to - ✔✔Record the occupational exposure received by the operator The most common radiographic exposure used to detect periodontal disease is a/an - ✔✔Periapical Emulsion damage to a film is caused by - ✔✔Improper handling of film Which of the following influences the sharpness of a radiograph? - ✔✔Focal spot size Duplication film is coated with - ✔✔One-sided emulsion
The best way a dental assistant can minimize cross-contamination when exposing radiographs is to - ✔✔Touch as few surfaces as possible Which of the following is a disadvantage of panoramic radiographs? - ✔✔Higher cost of equipment Which of the following increases the density on duplicated film? - ✔✔Decrease the exposure time Which of the following regulates the manufacturing and installation of x-ray equipment? - ✔✔Federal government Which of the following causes the interproximal areas of the teeth to appear overlapped? - ✔✔Improper horizontal angulation The penetrating x-ray beam produced during dental radiography is called - ✔✔Primary radiation On a radiograph, when the contact area of one tooth is superimposed over the contact of another, it is called - ✔✔Overlapping Paralleling technique requires the film be placed - ✔✔Away from the tooth, toward the middle of the oral cavity How frequently should processing solution be replenished? - ✔✔Daily Maximum wattage for a safelight bulb should be - ✔✔ 15
Which of the following landmarks is useful when mounting films of the mandibular posterior area? - ✔✔Mental foramen Long-term effects of exposure to radiation may be associated with - ✔✔Birth abnormalities Which of the following could cause a straight black line/border to appear on a radiograph? - ✔✔Fixer solution was low To maintain quality assurance while processing films, dental assistants should record - ✔✔The date solutions were changed To view an abscess on tooth #25, the best radiographic exposure is a/an - ✔✔Periapical Processing tanks should be cleaned when the - ✔✔Solutions are changed Which of the following affects the quantity of x-rays being emitted from the tubehead? - ✔✔mA Which of the following is a measurement of tissue damage from x-ray energy? - ✔✔Radiation absorbed dose ALARA is primarily concerned with the radiation that is - ✔✔Artificial Which of the following should be used to prevent cross-contamination from exposure buttons? - ✔✔Plastic cover
The most common reason for taking bitewing radiographs is to evaluate - ✔✔Interproximal caries The main purpose of using a lead apron with a thyroid collar when exposing dental radiographs is to protect the patient from - ✔✔Scatter radiation Most bilateral findings in radiographs are considered - ✔✔Normal anatomic landmarks The primary purpose of the bitewing radiograph is to evaluate - ✔✔Interproximal decay The best way to prevent cross-contamination from an exposed film packet is by - ✔✔Using individual barrier envelops Storing unexposed radiographic film in high humidity conditions may cause - ✔✔Film fog Radiation injury can be measured by - ✔✔Dose rate What size film is most effective, when placed vertically in the anterior region, to evaluate caries and periodontal health? - ✔✔ 2 When changing the 8 - inch PID to a 16 - inch PID, which of the following is used to determine the intensity of the beam? - ✔✔Inverse square law
Which of the following affects the speed of the electrons emitted from the tubehead? - ✔✔kVps Radiation injury results from - ✔✔Exposure Dental healthcare personnel who are pregnant can expose radiographs during the - ✔✔Entire pregnancy The diameter of the cone-shaped beam produced from a circular collimator is - ✔✔2.75 inches The penetrating x-ray beam produced during dental radiography is called - ✔✔Primary radiation Developing solution temperatures should be checked frequently when using - ✔✔Manual processing Which of the following landmarks would be seen in maxillary anterior periapical - ✔✔Incisive foramen If there are no teeth to serve as guides, which of the following landmarks indicates a maxillary molar area radiograph? - ✔✔Tuberosity Human tissues are mainly composed of - ✔✔Water/H2O The most important step the dentist can take in protecting patients form x-radiation is to - ✔✔Properly prescribe radiographs
While exposing x-ray films, radiation deflecting off the patient's head is called - ✔✔Scatter radiation Which of the following landmarks is useful when mounting films in the maxillary central area? - ✔✔Anterior nasal spine Which of the following can be observed on a panoramic radiograph when the patient's chin is tipped downward? - ✔✔Exaggerated smile When the tubehead drifts, the first step the dental assistant should take is to - ✔✔Stop using the machine During the processing of x-ray film, the removal of the halide portion of the exposed silver crystals is called - ✔✔Reduction The occlusal plane will appear diagonal in the radiograph when there is a/an - ✔✔Incorrect film placement The shorter the wavelength of electromagnetic radiation, the greater the - ✔✔Energy Which of the following radiation effects increase in severity as more radiation is absorbed by somatic cells? - ✔✔Nonstochastic Foreshortening of the maxillary radiographic image results from - ✔✔Increased vertical angulation
Which of the following should be labeled on the radiographic mount prior to film duplication? - ✔✔Right and left sides On a radiograph, what is the dense radiopaque band the outlines the edge of the mandible? - ✔✔Inferior border Which of the following landmarks are located by the midline of the mandible? - ✔✔Genial tubercles Which of the following prevents x-rays from escaping the tubehead? - ✔✔Leaded-glass housing When preparing to take a digital radiograph, after selecting the appropriate sensor size for the patient, the next step is to - ✔✔Place a barrier on the sensor Which of the following radiographic techniques is recommended for a patient with a shallow palate? - ✔✔Bisecting Which of the following conditions will result in a radiographic image that is too light? - ✔✔Weak developing solution Chemical agents should be properly disposed of according to - ✔✔Federal, state, and local laws To reduce the patient's anxiety about radiographic exposure the dental assistant should - ✔✔Take time to explain the procedure
Which of the following describes how most radiographic carious lesions appear? - ✔✔Radiolucent When mounting periapical radiographs, what information helps to distinguish maxillary molar radiographs from mandibular radiographs? - ✔✔The maxillary sinus outline is visible To help desensitize the tissue prior to film placement, the dental assistant should - ✔✔Rub a finger along the tissues where the film touches Which of the following errors occur when the vertical angulation is incorrect? - ✔✔Elongation Which of the following landmarks is useful when mounting films in the maxillary posterior area? - ✔✔Floor of the maxillary sinus When taking radiographs on a small child who cannot hold the film intra-orally, the dental assistant should - ✔✔Ask a parent or guardian to hold the film Which of the following was established to address the education and certification of operators of radiographic equipment? - ✔✔Consumer-Patient Radiation Health and Safety Act Which of the following conditions may mimic caries on an intraoral radiograph? - ✔✔Root resorption When documenting a lesion found on a radiograph, all of the following should be described except - ✔✔Severity
Which of the following radiolucencies may be mistaken for caries? - ✔✔Cervical burnout An underexposed film will appear - ✔✔Light A film with a damaged emulsion will appear - ✔✔Cracked If a patient did not remove earrings prior to exposing a panoramic, the radiograph could have - ✔✔Ghost images The Buccal Object Rule is used to determine if a foreign body is located in which direction? - ✔✔Lingual to buccal Which of the following radiation injury theories describes cells that are damaged by way of absorption? - ✔✔Indirect Cells most susceptible to radiation damage are - ✔✔Bone marrow Which of the following cells exposed to radiation may be associated with leukemia? - ✔✔Somatic When taking a panoramic radiograph, the patient's head should be oriented - ✔✔With the midsagittal plane perpendicular to the floor
Inside the film packet, the film is wrapped with a/an - ✔✔Black paper sheet Which of the following bitewing film size is the longest? - ✔✔ 3 Contrast in a radiograph is primarily controlled by - ✔✔KPV The annual maximum accumulated dose (MAD) of radiation for a dental assistant is based on which of the following calculations? - ✔✔Age minus 18 times 5 rems/year Personnel monitoring for radiation exposure is done by - ✔✔Wearing a dosimeter Dental x-rays should be prescribed when the - ✔✔Benefits outweigh the risk of harm Where is the most common area in the oral cavity for a dentigerous cyst? - ✔✔Around the third molars When using an automatic processor, how many seconds should be allowed between the insertion of each dental film? - ✔✔10 seconds Which of the following measures the amount of radiation that reaches the surface of the skin? - ✔✔Roentgen Bitetabs placed on a film for use during bitewing radiographs should be positioned on the - ✔✔White unprinted side of the packet
Which of the following will best protect the dental assistant from cross-contamination - ✔✔Gloves Which of the following PID produces the greatest amount of secondary radiation? - ✔✔Closed-end plastic cone Which of the following would cause a radiopaque artifact on a radiograph? - ✔✔Metallic partial denture Which of the following quality control tests evaluates safe-lighting in the darkroom? - ✔✔Coin test Which of the following will cause white spots to appear on radiographs? - ✔✔Fixer solution contacts the film Which of the following would you adjust to produce wavelengths with the greatest penetrating power? - ✔✔KPV The amount of which of the following is used in determining the degree of radiation injury? - ✔✔Tissue irradiated When radiographs are mounted with the embossed dot appearing outward, this is know as - ✔✔Facial mounting Which of the following is a disposable intraoral x-ray film holder device? - ✔✔Stabe Which film would be exposed to see increased coverage of the alveolar bone? - ✔✔Vertical bitewing
The optimal temperature of the developer in automatic processing is - ✔✔ 80 - 95 degrees The purpose of the intensifying screens is to - ✔✔Decrease the amount of radiation The radiation exposure that poses the greatest hazard to the operator is - ✔✔Leakage radiation The purpose of a grid device on an extraroral cassette is to - ✔✔Reduce scatter radiation reaching the film When exposing a posterior periapical radiograph on an adult patient with no intraoral restrictions, which size film should be used? - ✔✔ 2 Which of the following is the most effective method of reducing patient exposure to x-radiation? - ✔✔Fast film A full mouth series of periapical radiographs taken on an edentulous patient will consist of - ✔✔Six anterior and eight posterior How often should step wedge quality control tests for a dental x-ray machine be conducted? - ✔✔Daily Which of the following results in a double image radiograph? - ✔✔Exposing the same film twice
Impacted third molars are best seen with what type of radiograph - ✔✔Panoramic Which of the following sequences best describes radiation injury to tissue? - ✔✔Latent period, period of injury, period of recovery Which of the following protection techniques is used to minimize x-radiation exposure to the operator?
- ✔✔Structural shielding Which of the following radiographic errors is caused by removing a film too quickly from a tightly packed box? - ✔✔Static electricity The most radiolucent area on the anterior radiograph is the - ✔✔Nasal fossa During radiographic exposures, semi-critical items that must be sterilized or disposed of include - ✔✔Film holding devices Compared to a dentulous patient, radiographic exposure time on an edentulous adult patient should - ✔✔Decrease Which of the following best describes what happens when two films contact each other during processing? - ✔✔Overlapped films
For x-ray machines operating in ranges at or below 70 kVp, the total aluminum equivalent filtration must be a minimum of - ✔✔1.5 mm The BEST radiograph to evaluate a suspected salivary stone in the submandibular gland is a/an - ✔✔Occlusal A radiograph will automatically be retaken when there is a - ✔✔Double exposure The most common artificial radiation exposure comes from - ✔✔Medical radiation Back-scatter radiation to the film is prevented by the - ✔✔Lead foil Compared to a round PID, which of the following reduces patient radiation exposure by up to 70%? - ✔✔Rectangular-shaped Prior to exposing dental radiographs on a visually impaired patient, the dental assistant should - ✔✔Use touch to explain the equipment and procedure Supernumerary teeth are best detected using what type of film? - ✔✔Panoramic The ADA recommends that radiographs be mounted with the embossed dots - ✔✔On the occlusal surface Which of the following film size is used for an occlusal exposure? - ✔✔ 4
