Missouri Radiologic Technologist
Licensing Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. Which radiation primarily contributes to patient dose during
diagnostic radiography?
A. Characteristic radiation
B. Scatter radiation
C. Leakage radiation
D. Primary beam
Answer: D
Rationale: The primary beam is the main source of patient exposure
during radiographic procedures because it is directed toward the
patient for imaging.
2. What is the function of a collimator in radiography?
A. Increase beam intensity
, B. Reduce scatter radiation and limit field size
C. Convert x-rays to light
D. Detect radiation exposure
Answer: B
Rationale: Collimators limit the x-ray beam size, reducing patient
dose and scatter radiation.
3. Which factor primarily controls radiographic contrast?
A. mAs
B. kVp
C. SID
D. OID
Answer: B
Rationale: Kilovoltage peak (kVp) determines beam energy and thus
image contrast.
4. What is the main purpose of a grid in radiography?
A. Increase contrast by absorbing scatter radiation
B. Increase exposure time
C. Decrease patient dose
D. Increase magnification
Answer: A
Rationale: Grids absorb scatter radiation before it reaches the image
receptor, improving contrast.
,5. What unit is used to measure absorbed radiation dose?
A. Sievert
B. Gray
C. Roentgen
D. Curie
Answer: B
Rationale: The gray (Gy) is the SI unit for absorbed dose.
6. Which of the following is most sensitive to radiation?
A. Muscle
B. Bone
C. Reproductive cells
D. Nerve tissue
Answer: C
Rationale: Germ cells are highly radiosensitive due to rapid division.
7. What is the inverse square law used to describe?
A. Image magnification
B. Radiation intensity decreases with distance
C. Exposure time changes
D. Grid ratio effect
Answer: B
Rationale: Radiation intensity decreases proportionally to the square
of distance from the source.
, 8. Which radiographic technique reduces motion blur?
A. Decreasing mA
B. Increasing exposure time
C. Decreasing exposure time
D. Increasing OID
Answer: C
Rationale: Shorter exposure times reduce patient motion artifacts.
9. What is the primary function of the anode in an x-ray tube?
A. Produce electrons
B. Convert electrical energy to x-rays
C. Focus electrons
D. Cool the tube
Answer: B
Rationale: The anode converts kinetic energy of electrons into x-ray
photons.
10. What is the heel effect in x-ray production?
A. Uniform beam intensity
B. Higher intensity on cathode side
C. Higher intensity on anode side
D. No variation in beam
Answer: B
Rationale: X-ray intensity is greater on the cathode side due to
photon absorption in the anode.
Licensing Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. Which radiation primarily contributes to patient dose during
diagnostic radiography?
A. Characteristic radiation
B. Scatter radiation
C. Leakage radiation
D. Primary beam
Answer: D
Rationale: The primary beam is the main source of patient exposure
during radiographic procedures because it is directed toward the
patient for imaging.
2. What is the function of a collimator in radiography?
A. Increase beam intensity
, B. Reduce scatter radiation and limit field size
C. Convert x-rays to light
D. Detect radiation exposure
Answer: B
Rationale: Collimators limit the x-ray beam size, reducing patient
dose and scatter radiation.
3. Which factor primarily controls radiographic contrast?
A. mAs
B. kVp
C. SID
D. OID
Answer: B
Rationale: Kilovoltage peak (kVp) determines beam energy and thus
image contrast.
4. What is the main purpose of a grid in radiography?
A. Increase contrast by absorbing scatter radiation
B. Increase exposure time
C. Decrease patient dose
D. Increase magnification
Answer: A
Rationale: Grids absorb scatter radiation before it reaches the image
receptor, improving contrast.
,5. What unit is used to measure absorbed radiation dose?
A. Sievert
B. Gray
C. Roentgen
D. Curie
Answer: B
Rationale: The gray (Gy) is the SI unit for absorbed dose.
6. Which of the following is most sensitive to radiation?
A. Muscle
B. Bone
C. Reproductive cells
D. Nerve tissue
Answer: C
Rationale: Germ cells are highly radiosensitive due to rapid division.
7. What is the inverse square law used to describe?
A. Image magnification
B. Radiation intensity decreases with distance
C. Exposure time changes
D. Grid ratio effect
Answer: B
Rationale: Radiation intensity decreases proportionally to the square
of distance from the source.
, 8. Which radiographic technique reduces motion blur?
A. Decreasing mA
B. Increasing exposure time
C. Decreasing exposure time
D. Increasing OID
Answer: C
Rationale: Shorter exposure times reduce patient motion artifacts.
9. What is the primary function of the anode in an x-ray tube?
A. Produce electrons
B. Convert electrical energy to x-rays
C. Focus electrons
D. Cool the tube
Answer: B
Rationale: The anode converts kinetic energy of electrons into x-ray
photons.
10. What is the heel effect in x-ray production?
A. Uniform beam intensity
B. Higher intensity on cathode side
C. Higher intensity on anode side
D. No variation in beam
Answer: B
Rationale: X-ray intensity is greater on the cathode side due to
photon absorption in the anode.
