NDT Level I Technician Examination Non-

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

• Which of the following is a primary advantage of non-destructive

testing?

• It is less expensive than destructive testing
• It does not damage the part being tested
• It always provides higher accuracy than destructive testing
• It requires no training

Answer: B

Rationale: Non-destructive testing allows evaluation of materials or

components without impairing their future usefulness.

• In radiographic testing, which type of radiation is commonly used?
• Alpha particles 1 / 4

• Beta particles
• X-rays and gamma rays
• Neutrons

Answer: C

Rationale: X-rays and gamma rays can penetrate materials, producing

images to reveal internal defects.

• In ultrasonic testing, what is the purpose of the transducer?
• To store the test results
• To convert electrical energy into sound waves and vice versa
• To magnify surface cracks
• To filter defects

Answer: B

Rationale: The transducer generates ultrasonic waves and converts the

returning echoes into electrical signals.

• Which NDT method is most suitable for detecting surface cracks in

non-ferromagnetic metals?

• Radiographic testing
• Ultrasonic testing
• Eddy current testing
• Acoustic emission testing

Answer: C

Rationale: Eddy current testing is highly effective for detecting surface

and near-surface defects in conductive materials. 2 / 4

• In liquid penetrant testing, what is the purpose of the developer?
• To remove excess penetrant
• To draw penetrant out of defects and make them visible
• To clean the surface
• To etch the material

Answer: B

Rationale: The developer helps reveal flaws by drawing penetrant from

discontinuities to make them observable.

• Which type of magnetic particle testing is used for detecting surface

and slightly subsurface defects?

• AC for deep penetration
• DC for all metals
• AC for surface defects, DC for deeper defects
• DC for surface, AC for deep defects

Answer: C

Rationale: AC is best for detecting surface cracks due to the skin effect,

while DC penetrates deeper.

• What is a key limitation of radiographic testing?
• Cannot detect internal defects
• Requires access to both sides of the component
• Works only for non-metallic materials
• Cannot detect volumetric defects

Answer: B 3 / 4

Rationale: Radiography requires placing a source and a detector on

opposite sides to capture an image.

• Which personal protective equipment (PPE) is essential for radiation

safety in radiographic testing?

• Safety gloves
• Respirator
• Lead apron and dosimeter
• Hearing protection

Answer: C

Rationale: Lead aprons shield against radiation, and dosimeters

monitor exposure levels.

9. The term “indication” in NDT refers to:

• A measurement of wall thickness
• A successful test procedure
• A sign that a discontinuity may exist
• A finished inspection report

Answer: C

Rationale: An indication is any observed response suggesting a

possible defect.

• Which NDT method uses high-frequency sound waves?
• Radiographic testing
• Magnetic particle testing
• Ultrasonic testing
• / 4