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1. Which of the following discoveries marked the beginning of dental
radiography?
 A. X-rays
 B. Radio waves
 C. Microwaves
 D. Infrared rays
 Answer: A. X-rays
 Rationale: X-rays were discovered by Wilhelm Conrad Roentgen in
1895, leading to the development of dental radiography.
2. What is the primary purpose of dental radiography?
 A. Diagnosis of dental caries
 B. Detection of periodontal disease
 C. Assessment of bone levels
 D. All of the above
 Answer: D. All of the above
 Rationale: Dental radiography is used for various purposes, including
diagnosing dental caries, detecting periodontal disease, and assessing bone
levels.
3. In digital radiography, which of the following is responsible for
converting the x-ray energy into an electronic signal?
 A. Photostimulable phosphor plate
 B. Charge-coupled device
 C. Photodiode
 D. Amorphous silicon detector
 Answer: A. Photostimulable phosphor plate
 Rationale: In digital radiography, the photostimulable phosphor plate
converts x-ray energy into an electronic signal for image capture.
4. Which of the following types of radiation is used in dental radiography?
 A. Alpha particles
 B. Beta particles
 C. Gamma rays
 D. Neutron radiation
 Answer: C. Gamma rays
 Rationale: Gamma rays, a type of electromagnetic radiation, are used in
dental radiography for image production.
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