Radiologic Technologist exam Questions
With Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
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1. What is the primary purpose of a collimator in radiography?
A. Increase radiation dose
B. Limit the size and shape of the x-ray beam
C. Produce x-rays
D. Measure exposure time
Rationale: Collimation reduces patient exposure and improves
image quality by restricting the beam to the area of interest.
2. Which unit measures absorbed radiation dose?
A. Curie
B. Gray (Gy)
C. Roentgen
D. Sievert
Rationale: The gray (Gy) is the SI unit for absorbed dose in tissue.
3. What is the function of an intensifying screen?
A. Decrease scatter radiation
B. Convert x-rays to visible light to reduce patient dose
C. Increase beam energy
D. Measure radiation output
Rationale: Intensifying screens convert x-rays to light, allowing
lower exposure.
,4. Which structure is best visualized in a PA chest radiograph?
A. Heart size magnified
B. Reduced cardiac magnification
C. Liver
D. Spleen only
Rationale: PA positioning places heart closer to detector, reducing
magnification.
5. What is the primary hazard of ionizing radiation?
A. Skin irritation only
B. DNA damage leading to mutation
C. Temporary dizziness
D. Muscle fatigue
Rationale: Ionizing radiation can damage DNA and increase cancer
risk.
6. Which exposure factor controls beam quantity?
A. kVp
B. mAs
C. SID
D. Collimation
Rationale: mAs directly controls the number of x-ray photons
produced.
7. What is kVp primarily responsible for?
A. Image noise
B. Penetrating power of the beam
C. Patient motion
D. Detector size
Rationale: kVp controls beam energy and penetration.
, 8. Which organ is most radiosensitive?
A. Bone
B. Bone marrow
C. Teeth
D. Tendons
Rationale: Bone marrow has rapidly dividing cells, increasing
sensitivity.
9. What is the inverse square law used to determine?
A. Exposure time
B. Radiation intensity changes with distance
C. kVp settings
D. Image contrast
Rationale: Intensity decreases proportionally to the square of
distance.
10. What does ALARA stand for?
A. As Low As Reasonably Accessible
B. As Low As Reasonably Achievable
C. Always Limit Radiation Absorption
D. Absolute Low Radiation Activity
Rationale: ALARA minimizes radiation exposure.
11. Which position demonstrates the heart without
magnification?
A. AP
B. PA
C. Lateral
D. Oblique
Rationale: PA positions heart closer to detector.
With Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of a collimator in radiography?
A. Increase radiation dose
B. Limit the size and shape of the x-ray beam
C. Produce x-rays
D. Measure exposure time
Rationale: Collimation reduces patient exposure and improves
image quality by restricting the beam to the area of interest.
2. Which unit measures absorbed radiation dose?
A. Curie
B. Gray (Gy)
C. Roentgen
D. Sievert
Rationale: The gray (Gy) is the SI unit for absorbed dose in tissue.
3. What is the function of an intensifying screen?
A. Decrease scatter radiation
B. Convert x-rays to visible light to reduce patient dose
C. Increase beam energy
D. Measure radiation output
Rationale: Intensifying screens convert x-rays to light, allowing
lower exposure.
,4. Which structure is best visualized in a PA chest radiograph?
A. Heart size magnified
B. Reduced cardiac magnification
C. Liver
D. Spleen only
Rationale: PA positioning places heart closer to detector, reducing
magnification.
5. What is the primary hazard of ionizing radiation?
A. Skin irritation only
B. DNA damage leading to mutation
C. Temporary dizziness
D. Muscle fatigue
Rationale: Ionizing radiation can damage DNA and increase cancer
risk.
6. Which exposure factor controls beam quantity?
A. kVp
B. mAs
C. SID
D. Collimation
Rationale: mAs directly controls the number of x-ray photons
produced.
7. What is kVp primarily responsible for?
A. Image noise
B. Penetrating power of the beam
C. Patient motion
D. Detector size
Rationale: kVp controls beam energy and penetration.
, 8. Which organ is most radiosensitive?
A. Bone
B. Bone marrow
C. Teeth
D. Tendons
Rationale: Bone marrow has rapidly dividing cells, increasing
sensitivity.
9. What is the inverse square law used to determine?
A. Exposure time
B. Radiation intensity changes with distance
C. kVp settings
D. Image contrast
Rationale: Intensity decreases proportionally to the square of
distance.
10. What does ALARA stand for?
A. As Low As Reasonably Accessible
B. As Low As Reasonably Achievable
C. Always Limit Radiation Absorption
D. Absolute Low Radiation Activity
Rationale: ALARA minimizes radiation exposure.
11. Which position demonstrates the heart without
magnification?
A. AP
B. PA
C. Lateral
D. Oblique
Rationale: PA positions heart closer to detector.
