Dental Radiology Practice Test Questions And Answers

Reviewed by Benjamin Yoon
Benjamin Yoon, DMD, Dentistry |
Dental Expert
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Benjamin earned his Doctor of Dental Medicine (DMD) from Nova Southeastern University College of Dental Medicine, equipping him with the necessary expertise and skills to excel in the field of dentistry. As our meticulous dental expert, he reviews our quizzes to guarantee top-notch quality. With his extensive knowledge and acute attention to detail, he ensures our dental content is informative and precise. His expertise is vital in upholding the highest standards, delivering reliable educational material to our users.
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Dental Radiology Practice Test Questions And Answers - Quiz

Are you practicing dental studies? If yes, then take this 'Dental Radiology' practice test that is designed to test your understanding and knowledge of radiation physics and the fundamentals of radiographic interpretation. Our teeth form the gateway to our overall health and therefore it is important to take care of them. We have different teeth types, and each one of them serves some kind of crucial purpose. If you're well versed with the concepts of dental radiology, then take up this quiz and test your skills.
So, are you ready? All the best!


Dental Radiology Questions and Answers

  • 1. 

    An example of particulate radiation is:

    • A.

      Gamma rays

    • B.

      X-rays

    • C.

      Cathode rays

    • D.

      None of the above

    • E.

      All of the above

    Correct Answer
    C. Cathode rays
    Explanation
    Cathode rays are an example of particulate radiation because they consist of streams of high-speed electrons that are emitted from the cathode in a vacuum tube. These electrons have mass and charge, making them particles. In contrast, gamma rays and x-rays are forms of electromagnetic radiation, which do not consist of particles but rather are composed of photons. Therefore, cathode rays are the only option among the given choices that represents particulate radiation.

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  • 2. 

    Name the following intraoral radiograph:

    • A.

      Periapical radiograph

    • B.

      Bitewing radiograph

    • C.

      Occlusal radiograph

    • D.

      Biteblock radiograph

    • E.

      Pericoronal radiograph

    Correct Answer
    A. Periapical radiograph
    Explanation
    The given radiograph is named a periapical radiograph. This type of intraoral radiograph captures the entire tooth, from the crown to the root tip, as well as the surrounding bone and tissues. It is commonly used to diagnose and assess conditions such as dental caries, periodontal disease, and periapical infections. The periapical radiograph provides a detailed view of the tooth's root structure and the surrounding bone, aiding in the identification of any abnormalities or pathology.

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  • 3. 

    The cathode and anode are parts of an X-ray tube. The anode is negatively charged. Which statement is correct?

    • A.

      The first statement is correct. The second statement is wrong

    • B.

      The first statement is wrong. The second statement is correct

    • C.

      Both the statements are correct

    • D.

      Both the statements are wrong

    Correct Answer
    A. The first statement is correct. The second statement is wrong
    Explanation
    The cathode and anode are indeed parts of an x-ray tube, which makes the first statement correct. However, the anode is positively charged, not negatively charged, making the second statement incorrect.

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  • 4. 

    One of the following types of radiation has high Linear Energy Transfer (LET) and hence the potential for more radiation-related tissue damage:

    • A.

      Gamma rays

    • B.

      X-rays

    • C.

      Alpha rays

    • D.

      Microwaves

    • E.

      U-V radiation

    Correct Answer
    C. Alpha rays
    Explanation
    Alpha rays have high Linear Energy Transfer (LET) and, therefore, have the potential for more radiation-related tissue damage. LET is a measure of the rate at which energy is deposited in tissue per unit length of the particle's track. Alpha particles are relatively large and heavy compared to gamma rays and X-rays, and they carry a positive charge. This characteristic makes alpha particles more effective in causing ionization and producing damage to biological tissues. Gamma rays, X-rays, microwaves, and ultraviolet (U-V) radiation generally have lower LET and are less damaging to biological tissues.

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  • 5. 

    Identify the intraoral radiograph shown

    • A.

      Periapical radiograph

    • B.

      Bitewing radiograph

    • C.

      Maxillary midline occlusal radiograph

    • D.

      Mandibular floor of the mouth occlusal

    • E.

      Lateral cephalometric radiograph

    Correct Answer
    D. Mandibular floor of the mouth occlusal
    Explanation
    The correct answer is mandibular floor of the mouth occlusal. This type of radiograph is taken to assess the mandibular arch and the floor of the mouth. It provides a clear view of the mandibular teeth, their roots, and the surrounding structures. The radiograph is taken by placing the film or sensor on the floor of the mouth and having the patient bite down gently. This allows for a comprehensive evaluation of the mandibular area and is commonly used in dental examinations and treatment planning.

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  • 6. 

    The radiograph shown here is a:

    • A.

      Panoramic radiograph

    • B.

      Occlusal radiograph

    • C.

      Lateral oblique radiograph

    • D.

      P-A view of the skull

    • E.

      A-P view of the skull

    Correct Answer
    A. Panoramic radiograph
    Explanation
    The radiograph shown here is a panoramic radiograph. This can be determined by examining the image, which shows a wide view of the entire upper and lower jaws, including the teeth and surrounding structures. A panoramic radiograph is commonly used in dentistry to capture a comprehensive image of the oral and maxillofacial region. It provides valuable information about the teeth, jawbones, sinuses, and temporomandibular joints.

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  • 7. 

    In the construction of an X-ray tube, the function of a step-down transformer is to

    • A.

      Convert the line current of 110 volts  (110 volts is power) to less than 10 million amperes.

    • B.

      Convert the line current of 110 volts to less than 10 volts.

    • C.

      Convert the line current of 220 volts to less than 10 volts.

    • D.

      Convert the line current of 110 volts to less than 100 amperes.

    Correct Answer
    A. Convert the line current of 110 volts  (110 volts is power) to less than 10 million amperes.
    Explanation
    The function of a step-down transformer in an X-ray tube is to reduce the line current of 110 volts to less than 10 million amperes. This transformation is crucial as handling such high currents directly would be impractical and hazardous. By decreasing the current while increasing the voltage, the transformer ensures the safe and efficient operation of the X-ray tube for medical imaging purposes.

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  • 8. 

    In the radiographic principle, "SLOB rule, "the same side movement of the object is ______, and the opposite side movement of the object is ______. What are the missing words in the same sequence?

    • A.

      Lateral and buccal

    • B.

      Lingual and buccal

    • C.

      Lingual and both sides

    • D.

      Lateral and both sides

    Correct Answer
    B. Lingual and buccal
    Explanation
    The SLOB rule in radiographic principles states that when the object moves in the same direction as the x-ray tube, it appears to move in a lingual direction on the radiograph. Conversely, when the object moves in the opposite direction of the x-ray tube, it appears to move in a buccal direction on the radiograph. Therefore, the missing words in the same sequence are "lingual" and "buccal."

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  • 9. 

    70 kilovolts equals

    • A.

      70,000 volts

    • B.

      700,000 volts

    • C.

      70,000,000 volts

    • D.

      7,000 volts

    • E.

      700 volts

    Correct Answer
    A. 70,000 volts
    Explanation
    1 kV = 1000 volts, hence 70 kV equals 70,000 volts

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  • 10. 

    The "rotating anode" design in an x-ray tube limits the amount of

    • A.

      Lighting at anode

    • B.

      Heat production at anode

    • C.

      Electron production at cathode

    • D.

      Speed of electrons from cathode to anode

    • E.

      X-rays that are produced at the anode

    Correct Answer
    B. Heat production at anode
    Explanation
    The rotating anode design in an x-ray tube limits the amount of heat production at the anode. This design allows for the anode to rotate, distributing the heat generated during the x-ray production over a larger surface area. By doing so, it prevents the anode from overheating and potentially damaging the tube. This is important because excessive heat can degrade the performance of the x-ray tube and shorten its lifespan.

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  • 11. 

    An example of an electromagnetic radiation is __________ rays.

    • A.

      Alpha rays

    • B.

      Beta rays

    • C.

      Cathode rays

    • D.

      Gamma rays

    • E.

      None of the above

    Correct Answer
    D. Gamma rays
    Explanation
    Gamma rays are an example of electromagnetic radiation because they are high-energy photons that are emitted during radioactive decay or nuclear reactions. Unlike alpha and beta rays, which consist of particles (alpha particles and beta particles) with mass and charge, gamma rays have no mass or charge. They have the highest frequency and shortest wavelength among the electromagnetic spectrum, making them highly penetrating and ionizing. Gamma rays are commonly used in medical imaging, cancer treatment, and sterilization processes due to their ability to pass through materials and interact with matter.

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  • 12. 

    The sharpness of the image is determined to a large extent by the

    • A.

      Shape of the object

    • B.

      The focal spot size

    • C.

      The make of the x-ray machine

    • D.

      The distance between the anode and cathode

    • E.

      None of the above

    Correct Answer
    B. The focal spot size
    Explanation
    The focal spot size is a key factor in determining the sharpness of an image in X-ray imaging. The focal spot size refers to the size of the area on the anode from which X-rays are emitted. A smaller focal spot size produces a sharper image because it allows for better spatial resolution and finer detail to be captured. On the other hand, a larger focal spot size can result in a blurrier image with reduced clarity. Therefore, the focal spot size plays a crucial role in determining the sharpness of an X-ray image.

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  • 13. 

    The radiograph shown here is frequently used in Orthodontics for study of the growth and development of the head. Name the radiograph

    • A.

      PA skull

    • B.

      AP skull

    • C.

      Submento vertex view

    • D.

      Lateral Cephalometric view

    • E.

      Panoramic view

    Correct Answer
    D. Lateral Cephalometric view
    Explanation
    The given radiograph, known as the Lateral Cephalometric view, is commonly used in Orthodontics to analyze the growth and development of the head. This radiograph provides a side view of the skull, allowing orthodontists to assess the position and alignment of the teeth, jaws, and facial structures. It is particularly useful for diagnosing skeletal abnormalities, planning orthodontic treatments, and monitoring progress throughout the treatment process.

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  • 14. 

    The "p" in kVp stands for

    • A.

      Percentage

    • B.

      Parallel

    • C.

      Punitive

    • D.

      Peak

    • E.

      Paired

    Correct Answer
    D. Peak
    Explanation
    p is the peak of the kilovoltage as it represents the peak energy of the beam. In a 70kVp beam only some of the photons have the energy representative of 70 kV while the rest of the photons have a lower energy ranges. That is why the beam is called "polychromatic beam"

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Benjamin Yoon |DMD, Dentistry |
Dental Expert
Benjamin earned his Doctor of Dental Medicine (DMD) from Nova Southeastern University College of Dental Medicine, equipping him with the necessary expertise and skills to excel in the field of dentistry. As our meticulous dental expert, he reviews our quizzes to guarantee top-notch quality. With his extensive knowledge and acute attention to detail, he ensures our dental content is informative and precise. His expertise is vital in upholding the highest standards, delivering reliable educational material to our users.

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  • Current Version
  • Jun 06, 2024
    Quiz Edited by
    ProProfs Editorial Team

    Expert Reviewed by
    Benjamin Yoon
  • Dec 06, 2008
    Quiz Created by
    Mupparapu
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