BDA Radiography and Radiology Exam
2026/2027 | 80 Verified Questions with
Answers & Rationales | 100% Pass
Guaranteed
1. Which property makes X-rays capable of producing ionization in
matter?
A. Long wavelength
B. High frequency and high energy
C. Low penetrating power
D. Visible light spectrum
B. High frequency and high energy
Ionization occurs because X-rays are high-energy electromagnetic
radiation that can remove electrons from atoms.
2. The unit used to express absorbed dose in dental radiography is:
A. Sievert
B. Gray
C. Becquerel
D. Coulomb
B. Gray
, The gray measures absorbed dose, while the sievert measures
equivalent dose and the becquerel measures radioactivity.
3. Which component of the X-ray tube emits electrons?
A. Anode
B. Cathode filament
C. Focal spot
D. Collimator
B. Cathode filament
Thermionic emission from the heated tungsten filament releases
electrons that travel toward the anode.
4. The primary purpose of the anode in an X-ray tube is to:
A. Emit electrons
B. Absorb secondary radiation
C. Decelerate electrons and produce X-rays
D. Filter the beam
C. Decelerate electrons and produce X-rays
When high-speed electrons strike the anode target, their sudden
deceleration produces bremsstrahlung and characteristic X-rays.
5. Increasing kilovoltage peak primarily affects:
A. Beam quantity only
B. Beam penetrating power and contrast
, C. Exposure time
D. Focal spot size
B. Beam penetrating power and contrast
Higher kVp increases the energy and penetrating ability of X-rays
and usually reduces contrast by producing a longer gray scale.
6. Increasing milliampere-seconds primarily affects:
A. Beam quality
B. Beam quantity or density
C. Focal trough
D. Image sharpness
B. Beam quantity or density
mAs is the product of tube current and exposure time and controls
the number of X-ray photons produced.
7. According to the inverse square law, if the distance from the X-ray
source is doubled, the intensity becomes:
A. Double
B. Half
C. One quarter
D. Unchanged
C. One quarter
, Radiation intensity is inversely proportional to the square of the
distance from a point source.
8. Which device restricts the X-ray beam to the area of interest?
A. Grid
B. Collimator
C. Filter
D. Receptor holder
B. Collimator
Collimation reduces the irradiated field, lowers patient dose, and
improves image quality by reducing scatter.
9. Filtration in the X-ray tube head is used to:
A. Increase contrast
B. Remove low-energy photons
C. Increase magnification
D. Shorten exposure time
B. Remove low-energy photons
Filtration absorbs predominantly low-energy X-rays that would
contribute to patient dose without contributing to the image.
10. The ALARA/ALARP principle means:
A. Doses should be as low as reasonably achievable/possible
B. All radiographs should be taken at maximum exposure
2026/2027 | 80 Verified Questions with
Answers & Rationales | 100% Pass
Guaranteed
1. Which property makes X-rays capable of producing ionization in
matter?
A. Long wavelength
B. High frequency and high energy
C. Low penetrating power
D. Visible light spectrum
B. High frequency and high energy
Ionization occurs because X-rays are high-energy electromagnetic
radiation that can remove electrons from atoms.
2. The unit used to express absorbed dose in dental radiography is:
A. Sievert
B. Gray
C. Becquerel
D. Coulomb
B. Gray
, The gray measures absorbed dose, while the sievert measures
equivalent dose and the becquerel measures radioactivity.
3. Which component of the X-ray tube emits electrons?
A. Anode
B. Cathode filament
C. Focal spot
D. Collimator
B. Cathode filament
Thermionic emission from the heated tungsten filament releases
electrons that travel toward the anode.
4. The primary purpose of the anode in an X-ray tube is to:
A. Emit electrons
B. Absorb secondary radiation
C. Decelerate electrons and produce X-rays
D. Filter the beam
C. Decelerate electrons and produce X-rays
When high-speed electrons strike the anode target, their sudden
deceleration produces bremsstrahlung and characteristic X-rays.
5. Increasing kilovoltage peak primarily affects:
A. Beam quantity only
B. Beam penetrating power and contrast
, C. Exposure time
D. Focal spot size
B. Beam penetrating power and contrast
Higher kVp increases the energy and penetrating ability of X-rays
and usually reduces contrast by producing a longer gray scale.
6. Increasing milliampere-seconds primarily affects:
A. Beam quality
B. Beam quantity or density
C. Focal trough
D. Image sharpness
B. Beam quantity or density
mAs is the product of tube current and exposure time and controls
the number of X-ray photons produced.
7. According to the inverse square law, if the distance from the X-ray
source is doubled, the intensity becomes:
A. Double
B. Half
C. One quarter
D. Unchanged
C. One quarter
, Radiation intensity is inversely proportional to the square of the
distance from a point source.
8. Which device restricts the X-ray beam to the area of interest?
A. Grid
B. Collimator
C. Filter
D. Receptor holder
B. Collimator
Collimation reduces the irradiated field, lowers patient dose, and
improves image quality by reducing scatter.
9. Filtration in the X-ray tube head is used to:
A. Increase contrast
B. Remove low-energy photons
C. Increase magnification
D. Shorten exposure time
B. Remove low-energy photons
Filtration absorbs predominantly low-energy X-rays that would
contribute to patient dose without contributing to the image.
10. The ALARA/ALARP principle means:
A. Doses should be as low as reasonably achievable/possible
B. All radiographs should be taken at maximum exposure
