Dental Radiology Practice Test Questions And Answers
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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 raysExplanation
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.Rate this question:
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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 radiographExplanation
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.Rate this question:
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- 3.
The cathode and anode are parts of an x-ray tube. The anode is negatively charged.
- 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 wrongExplanation
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.Rate this question:
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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 raysExplanation
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.Rate this question:
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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 occlusalExplanation
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.Rate this question:
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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 radiographExplanation
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.Rate this question:
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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.Rate this question:
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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 buccalExplanation
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."Rate this question:
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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 voltsExplanation
1 kV = 1000 volts, hence 70 kV equals 70,000 voltsRate this question:
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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 anodeExplanation
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.Rate this question:
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- 11.
An example of an electro-magnetic radiation is
- A.
Alpha rays
- B.
Beta rays
- C.
Cathode rays
- D.
Gamma rays
- E.
None of the above
Correct Answer
D. Gamma raysExplanation
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.Rate this question:
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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 sizeExplanation
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.Rate this question:
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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 viewExplanation
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.Rate this question:
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- 14.
The "p" in kVp stands for
- A.
Percentage
- B.
Parallel
- C.
Punitive
- D.
Peak
- E.
Paired
Correct Answer
D. PeakExplanation
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"Rate this question:
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Mar 17, 2024Quiz Edited by
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Expert Reviewed by
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Dec 06, 2008Quiz Created by
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