Radiation biology l Oral radiology 4th year MCQs for dental students

 MCQ on radiation biology for dental x-ray

The primary cause of biological damage from radiation is

a. ionization.

b. direct effect.

c. indirect effect.

d. genetic effect.

Direct injury from radiation occurs when the x-ray photons

a. ionize water and form toxins.

b. pass through the cell.

c. strike critical cell molecules.

d. All of the above.

Indirect injury from radiation occurs when the x-ray photons

a. ionize water and form toxins.

b. pass through the cell.

c. strike critical cell molecules.

d. All of the above.

According to the law of B and T, cells with a high reproductive rate are described as

a. radiopaque.

b. radiolucent.

c. radioresistant.

d. radiosensitive.

Which of these cells are most radiosensitive?

a. Brain cells

b. Nerve cells

c. White blood cells

d. Mature bone cells

Which of these cells are most radioresistant?

a. Endothelial cells

b. Muscle cells

c. Epithelial cells

d. Red blood cells

When the effect of a radiation exposure is observed in the offspring of an irradiated person, but not in the irradiated person, this is called the

a. somatic effect.

b. genetic effect.

c. direct effect.

d. indirect effect.

A dose–response curve indicating that any amount of radiation, no matter how small, has the potential to cause a biological response is called

a. stochastic

b. deterministic

c. threshold

d. nonthreshold

Each of the following is a factor that determines radiation injury EXCEPT one. Which one is the EXCEPTION?

a. Size of the irradiated area

b. Amount of radiation

c. Patient gender

d. Dose rate

According to the factors that determine radiation injury, based on age, who is the most radiosensitive?

a. a 6-year-old

b. a 16-year-old

c. a 26-year-old

d. a 46-year-old

Which of the following is the correct sequence of events following radiation exposure?

a. Period of injury, latent period, recovery period

b. Latent period, period of injury, recovery period

c. Latent period, recovery period, period of injury

d. Recovery period, latent period, period of injury

What term best expresses comparisons between dental radiation exposures and natural background exposure?

a. Absorbed dose

b. Effective dose equivalent

c. Accumulated dose

d. Lethal dose