PRACTICE QUESTIONS WITH CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2026 Q&A | INSTANT
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1. Which of the following is the primary purpose of a grid in
radiography?
A. Reduce motion blur
B. Improve image contrast
C. Decrease patient dose
D. Increase spatial resolution
The grid absorbs scattered radiation before it reaches the image
receptor, improving image contrast.
2. What is the unit of absorbed radiation dose?
A. Roentgen
B. Curie
C. Gray
D. Sievert
Gray measures the amount of radiation absorbed per unit mass of
tissue.
3. The ALARA principle stands for:
A. As Low As Reasonably Achievable
B. As Low As Reasonably Achievable
C. Always Limit All Radiation Accumulation
,D. Absolute Limitation of Any Radiation Activity
ALARA is a safety principle to minimize radiation exposure.
4. Which of the following is considered a long bone?
A. Carpals
B. Femur
C. Vertebra
D. Patella
Long bones are characterized by a shaft with two ends; femur is the
largest long bone.
5. In X-ray production, the cathode produces:
A. Heat
B. Electrons
C. Photons
D. Scatter radiation
Electrons are emitted from the cathode and accelerated toward the
anode.
6. Which tissue has the highest radiographic density?
A. Fat
B. Muscle
C. Bone
D. Air
Bone absorbs more X-rays, appearing more radiopaque on the image.
7. The unit used to measure exposure in air is:
A. Gray
B. Roentgen
C. Curie
D. Sievert
Roentgen measures ionization of air by X-rays or gamma rays.
, 8. The primary function of the collimator is to:
A. Increase mA
B. Reduce patient dose
C. Restrict the X-ray beam
D. Improve contrast
Collimation limits the size of the X-ray beam to reduce scatter and dose.
9. Radiographic contrast is primarily affected by:
A. mA
B. Exposure time
C. kVp
D. SID
Higher kVp reduces contrast; lower kVp increases contrast by altering
photon energy.
10. The line-focus principle is used to:
A. Increase patient exposure
B. Reduce effective focal spot size
C. Improve mA
D. Decrease kVp
The anode is angled to reduce the effective focal spot while maintaining
heat capacity.
11. Compton scattering results in:
A. Scatter radiation
B. Photoelectric absorption
C. No interaction
D. Fluorescence
Compton scattering produces scattered photons, contributing to
occupational exposure.
12. What type of radiation is produced when high-speed electrons
strike the anode?