NDT (Non-Destructive Testing) Technician Practice Exam Questions With Verified Answers and Detailed Rationales (2026) | Instant Download PDF Q&A Guide

NDT (Non-Destructive Testing) Technician
Practice Exam Questions With Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf

Question 1
What is the primary purpose of Non-Destructive Testing (NDT)?
A. To destroy defective materials
B. To evaluate material properties without causing damage
C. To increase material hardness
D. To permanently alter material structure
Answer: B
Rationale: NDT is used to inspect and evaluate materials without
damaging or altering their usability.


Question 2
Which NDT method uses high-frequency sound waves?
A. Radiographic Testing
B. Ultrasonic Testing
C. Magnetic Particle Testing
D. Liquid Penetrant Testing
Answer: B
Rationale: Ultrasonic Testing uses sound waves to detect internal flaws.

,Question 3
Which method is best for detecting surface cracks in non-porous
materials?
A. Radiographic Testing
B. Ultrasonic Testing
C. Liquid Penetrant Testing
D. Eddy Current Testing
Answer: C
Rationale: Liquid penetrant reveals surface-breaking defects.


Question 4
Radiographic Testing primarily uses:
A. Magnetic fields
B. Sound waves
C. X-rays or gamma rays
D. Electrical currents
Answer: C
Rationale: RT uses radiation to inspect internal structures.


Question 5
Magnetic Particle Testing is used on:
A. Non-metallic materials only
B. Ferromagnetic materials only
C. Plastic materials

,D. All materials
Answer: B
Rationale: It only works on materials that can be magnetized.


Question 6
Eddy Current Testing is based on:
A. Heat conduction
B. Electromagnetic induction
C. Radiation absorption
D. Mechanical vibration
Answer: B
Rationale: Eddy currents are induced in conductive materials by
changing magnetic fields.


Question 7
Which NDT method is most suitable for weld inspection?
A. Ultrasonic Testing
B. Visual Inspection only
C. Weight Testing
D. Hardness Testing
Answer: A
Rationale: UT is widely used for detecting weld defects internally.


Question 8

, The unit of frequency in ultrasonic testing is:
A. Joules
B. Hertz
C. Newton
D. Pascal
Answer: B
Rationale: Frequency is measured in Hertz (Hz).


Question 9
A discontinuity in NDT refers to:
A. A perfectly smooth surface
B. A change in material structure
C. A polished area
D. A coating layer
Answer: B
Rationale: Discontinuities are interruptions in material uniformity.


Question 10
Which NDT method requires a coupling medium?
A. Radiographic Testing
B. Ultrasonic Testing
C. Visual Testing
D. Magnetic Testing
Answer: B
Rationale: Couplant is needed to transmit ultrasonic waves.