Radiology Physics Model MCQs : SSC, UPSC, AIIMS
a) Gray (Gy)
b) Sievert (Sv)
c) Becquerel (Bq)
d) Roentgen (R)
Answer: b) Sievert (Sv)
2. Which term describes the ability of an x-ray imaging system to distinguish between two adjacent tissues with different densities?
a) Contrast resolution
b) Spatial resolution
c) Temporal resolution
d) Dynamic range
Answer: a) Contrast resolution
3. What property of x-rays allows them to create images by differential absorption?
a) Long wavelength
b) High frequency
c) Low energy
d) Ionization potential
Answer: b) High frequency
4. Which imaging modality utilizes radiofrequency pulses and strong magnetic fields to generate images of the body's internal structures?
a) X-ray
b) Ultrasound
c) Computed Tomography (CT)
d) Magnetic Resonance Imaging (MRI)
Answer: d) Magnetic Resonance Imaging (MRI)
5. In radiography, what does the term "mAs" stand for?
a) Milligray (mGy)
b) Milliampere-seconds
c) Megahertz (MHz)
d) Millimeter of mercury (mmHg)
Answer: b) Milliampere-seconds
6. What material is commonly used in x-ray tubes as the target for generating x-rays?
a) Lead
b) Aluminum
c) Tungsten
d) Copper
Answer: c) Tungsten
7. Which type of radiation results in the highest ionization density along its track?
a) Alpha particles
b) Beta particles
c) Gamma rays
d) X-rays
Answer: a) Alpha particles
8. Which law states that the intensity of radiation is inversely proportional to the square of the distance from the source?
a) Snell's Law
b) Hooke's Law
c) Coulomb's Law
d) Inverse Square Law
Answer: d) Inverse Square Law
9. What is the phenomenon where an x-ray photon loses energy as it scatters and changes direction after interacting with matter?
a) Coherent scattering
b) Compton scattering
c) Photoelectric effect
d) Pair production
Answer: b) Compton scattering
10. In radiography, what term describes the degree to which a substance permits the passage of x-rays?
a) Absorption
b) Attenuation
c) Transparency
d) Radiolucency
Answer: d) Radiolucency
11. What is the process where an x-ray photon is completely absorbed, ejecting an electron and creating characteristic radiation?
a) Coherent scattering
b) Compton scattering
c) Photoelectric effect
d) Pair production
Answer: c) Photoelectric effect
12. Which imaging modality uses sound waves to generate images of internal body structures?
a) X-ray
b) Computed Tomography (CT)
c) Magnetic Resonance Imaging (MRI)
d) Ultrasound
Answer: d) Ultrasound
13. What does the term "ALARA" stand for in radiology?
a) Applied Levels of Radiation Avoidance
b) As Low As Reasonably Achievable
c) Adequate Levels of Appropriate Radiation Applications
d) Avoiding Large Amounts of Radiation Adversity
Answer: b) As Low As Reasonably Achievable
14. In radiography, what term refers to the reduction in the intensity of the x-ray beam as it passes through tissue?
a) Absorption
b) Attenuation
c) Scattering
d) Penetration
Answer: b) Attenuation
15. What is the SI unit used to measure the activity of a radioactive substance?
a) Sievert (Sv)
b) Gray (Gy)
c) Becquerel (Bq)
d) Roentgen (R)
Answer: c) Becquerel (Bq)
16. Which interaction between x-rays and matter is responsible for the majority of image formation in diagnostic radiography?
a) Compton scattering
b) Photoelectric effect
c) Pair production
d) Coherent scattering
Answer: b) Photoelectric effect
17. What is the term for the measure of the radiation exposure of a population or group from a specified source over a specific period?
a) Radiation sickness
b) Collective effective dose
c) Absorbed dose
d) Latent period
Answer: b) Collective effective dose
18. Which law states that the angle of incidence equals the angle of reflection when a photon interacts with matter?
a) Snell's Law
b) Ohm's Law
c) Hooke's Law
d) Law of Reflection
Answer: d) Law of Reflection
19. Which type of radiation has the greatest penetration capability?
a) Alpha particles
b) Beta particles
c) Gamma rays
d) X-rays
Answer: c) Gamma rays
20. What term refers to the total amount of energy absorbed per unit mass by an irradiated object?
a) Absorbed dose
b) Equivalent dose
c) Effective dose
d) Exposure
Answer: a) Absorbed dose
21. Which term describes the ability of an x-ray imaging system to distinguish between small structures with high subject contrast?
a) Spatial resolution
b) Temporal resolution
c) Contrast resolution
d) Dynamic range
Answer: a) Spatial resolution
22. What is the term for the radiation emitted from an unstable atomic nucleus?
a) Ionizing radiation
b) Non-ionizing radiation
c) Electromagnetic radiation
d) Alpha radiation
Answer: a) Ionizing radiation
23. Which law governs the relationship between the voltage applied to an x-ray tube and the resulting x-ray energy?
a) Ohm's Law
b) Coulomb's Law
c) Faraday's Law
d) Bremsstrahlung Law
Answer: d) Bremsstrahlung Law
24. What is the process where an incident x-ray photon disappears, and two new photons of lower energy are created?
a) Photoelectric effect
b) Coherent scattering
c) Pair production
d) Characteristic radiation
Answer: c) Pair production
25. In radiation protection, what term describes the time between exposure to ionizing radiation and the appearance of health effects?
a) Latent period
b) Exposure period
c) Decay period
d) Absorption period
Answer: a) Latent period
26. Which imaging modality uses radioactive tracers to visualize and analyze the metabolic activity of tissues in the body?
a) Positron Emission Tomography (PET)
b) Magnetic Resonance Imaging (MRI)
c) Ultrasound
d) Computed Tomography (CT)
Answer: a) Positron Emission Tomography (PET)
27. What is the SI unit for the effective dose of ionizing radiation?
a) Becquerel (Bq)
b) Gray (Gy)
c) Sievert (Sv)
d) Roentgen (R)
Answer: c) Sievert (Sv)
28. Which type of radiation consists of high-energy electrons emitted from a radioactive nucleus?
a) Beta particles
b) Alpha particles
c) Gamma rays
d) X-rays
Answer: a) Beta particles
29. What phenomenon occurs when x-rays pass through matter without interaction or change in direction?
a) Absorption
b) Scattering
c) Transmission
d) Reflection
Answer: c) Transmission
30. Which law describes the relationship between the angle of incidence and the angle of refraction when radiation passes through different materials?
a) Snell's Law
b) Newton's Law
c) Boyle's Law
d) Hubble's Law
Answer: a) Snell's Law
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