DENTAL ASSISTANT PRACTICE EXAMINATION
SET QUESTIONS WITH VERIFIED ANSWERS
2026
◉ On an x-ray, which of the following will appear as radiolucent?
Answer: Decay
◉ Which of the following appears the most radiopaque on a dental
x-ray? Answer: Enamel
◉ Which of the following films would possibly show nasal fossa?
Answer: Upper anterior periapical
◉ What is the effect of x-rays in humans that causes disruption of
structure and damage to living tissues? Answer: lonization
◉ What is a bundle of energy that has no weight or mass? Answer:
Photon
◉ X-rays are a type of what kind of radiation? Answer:
Electromagnetic
, ◉ The ________ the wavelength, the greater the energy Answer:
Shorter
◉ What type of radiation occurs when x-rays are deflected by impact
with other objects, such as the patient's face? Answer: Scatter
◉ What type of radiation is less penetrating than others and is given
off after the initial x-ray beam comes into contact with the patient?
Answer: Secondary
◉ What is the stream of radiation called that is emitted from the x-
ray unit? Answer: Primary
◉ What type of radiation is due to faulty x-ray tubeheads? Answer:
Leakage
◉ Which of the following is a unit of measurement used to measure
radiation? Answer: Radiation absorbed dose
Roentgen
Sievert
◉ Which of the following does not belong to the standard system of
radiation measurement? Answer: The gray
SET QUESTIONS WITH VERIFIED ANSWERS
2026
◉ On an x-ray, which of the following will appear as radiolucent?
Answer: Decay
◉ Which of the following appears the most radiopaque on a dental
x-ray? Answer: Enamel
◉ Which of the following films would possibly show nasal fossa?
Answer: Upper anterior periapical
◉ What is the effect of x-rays in humans that causes disruption of
structure and damage to living tissues? Answer: lonization
◉ What is a bundle of energy that has no weight or mass? Answer:
Photon
◉ X-rays are a type of what kind of radiation? Answer:
Electromagnetic
, ◉ The ________ the wavelength, the greater the energy Answer:
Shorter
◉ What type of radiation occurs when x-rays are deflected by impact
with other objects, such as the patient's face? Answer: Scatter
◉ What type of radiation is less penetrating than others and is given
off after the initial x-ray beam comes into contact with the patient?
Answer: Secondary
◉ What is the stream of radiation called that is emitted from the x-
ray unit? Answer: Primary
◉ What type of radiation is due to faulty x-ray tubeheads? Answer:
Leakage
◉ Which of the following is a unit of measurement used to measure
radiation? Answer: Radiation absorbed dose
Roentgen
Sievert
◉ Which of the following does not belong to the standard system of
radiation measurement? Answer: The gray
