ASNT Level II NDT Technician Questions With
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. Which of the following best describes the primary purpose of Non-
Destructive Testing (NDT)?
A. To permanently alter material properties
B. To evaluate materials without causing damage
C. To increase material strength
D. To manufacture new components
Answer: B
Rationale: Non-Destructive Testing is used to inspect, test, or evaluate
materials, components, or systems without causing permanent
damage, ensuring they remain fit for service.
2. Which NDT method uses high-frequency sound waves to detect
internal flaws?
A. Radiographic Testing
B. Ultrasonic Testing
,C. Magnetic Particle Testing
D. Dye Penetrant Testing
Answer: B
Rationale: Ultrasonic Testing uses high-frequency sound waves that
reflect from internal discontinuities, allowing detection and sizing of
flaws.
3. What is the main principle behind Radiographic Testing (RT)?
A. Magnetic field leakage
B. Capillary action
C. X-ray or gamma radiation absorption differences
D. Eddy current induction
Answer: C
Rationale: RT works by passing radiation through a material and
capturing differences in absorption on film or digital detectors to
reveal internal defects.
4. Which discontinuity is most likely detected using Magnetic Particle
Testing?
A. Internal voids in aluminum
,B. Surface and near-surface cracks in ferromagnetic materials
C. Subsurface porosity in plastics
D. Laminar inclusions in ceramics
Answer: B
Rationale: Magnetic Particle Testing is effective only on ferromagnetic
materials and is sensitive to surface and near-surface discontinuities.
5. Dye Penetrant Testing is primarily used to detect which type of
defects?
A. Internal cracks
B. Surface-breaking discontinuities
C. Deep subsurface voids
D. Electrical conductivity variations
Answer: B
Rationale: PT relies on capillary action to reveal surface-breaking
defects such as cracks, porosity, and laps.
6. Eddy Current Testing is based on which physical principle?
A. Acoustic resonance
B. Electromagnetic induction
, C. Radiation absorption
D. Capillary attraction
Answer: B
Rationale: Eddy currents are induced in conductive materials by
alternating magnetic fields, and changes indicate flaws or material
variations.
7. What is the purpose of a reference standard in NDT?
A. To permanently alter test materials
B. To calibrate equipment and verify sensitivity
C. To increase inspection speed
D. To replace inspection procedures
Answer: B
Rationale: Reference standards ensure that NDT equipment is properly
calibrated and capable of detecting known flaw sizes.
8. In ultrasonic testing, what does “couplant” do?
A. Increases radiation strength
B. Enhances magnetic fields
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. Which of the following best describes the primary purpose of Non-
Destructive Testing (NDT)?
A. To permanently alter material properties
B. To evaluate materials without causing damage
C. To increase material strength
D. To manufacture new components
Answer: B
Rationale: Non-Destructive Testing is used to inspect, test, or evaluate
materials, components, or systems without causing permanent
damage, ensuring they remain fit for service.
2. Which NDT method uses high-frequency sound waves to detect
internal flaws?
A. Radiographic Testing
B. Ultrasonic Testing
,C. Magnetic Particle Testing
D. Dye Penetrant Testing
Answer: B
Rationale: Ultrasonic Testing uses high-frequency sound waves that
reflect from internal discontinuities, allowing detection and sizing of
flaws.
3. What is the main principle behind Radiographic Testing (RT)?
A. Magnetic field leakage
B. Capillary action
C. X-ray or gamma radiation absorption differences
D. Eddy current induction
Answer: C
Rationale: RT works by passing radiation through a material and
capturing differences in absorption on film or digital detectors to
reveal internal defects.
4. Which discontinuity is most likely detected using Magnetic Particle
Testing?
A. Internal voids in aluminum
,B. Surface and near-surface cracks in ferromagnetic materials
C. Subsurface porosity in plastics
D. Laminar inclusions in ceramics
Answer: B
Rationale: Magnetic Particle Testing is effective only on ferromagnetic
materials and is sensitive to surface and near-surface discontinuities.
5. Dye Penetrant Testing is primarily used to detect which type of
defects?
A. Internal cracks
B. Surface-breaking discontinuities
C. Deep subsurface voids
D. Electrical conductivity variations
Answer: B
Rationale: PT relies on capillary action to reveal surface-breaking
defects such as cracks, porosity, and laps.
6. Eddy Current Testing is based on which physical principle?
A. Acoustic resonance
B. Electromagnetic induction
, C. Radiation absorption
D. Capillary attraction
Answer: B
Rationale: Eddy currents are induced in conductive materials by
alternating magnetic fields, and changes indicate flaws or material
variations.
7. What is the purpose of a reference standard in NDT?
A. To permanently alter test materials
B. To calibrate equipment and verify sensitivity
C. To increase inspection speed
D. To replace inspection procedures
Answer: B
Rationale: Reference standards ensure that NDT equipment is properly
calibrated and capable of detecting known flaw sizes.
8. In ultrasonic testing, what does “couplant” do?
A. Increases radiation strength
B. Enhances magnetic fields
