NDT Level II Technician Practice Exam
Questions With Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
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1. Which of the following is the primary purpose of non-destructive
testing (NDT)?
a) To destroy defective materials
b) To detect defects without damaging the test object
c) To improve the mechanical properties of materials
d) To verify chemical composition
Rationale: The main purpose of NDT is to evaluate the properties or
detect defects in a material, component, or assembly without causing
damage, allowing continued use.
2. In radiographic testing, the contrast on a radiograph is primarily
influenced by:
a) Exposure time
b) Film size
, c) Material thickness and density differences
d) Type of developer
Rationale: Contrast is the difference in optical density between areas
of the radiograph, which depends on the varying absorption of
radiation due to differences in material thickness or density.
3. Which NDT method is most suitable for detecting surface cracks in
metals?
a) Radiographic testing
b) Liquid penetrant testing
c) Ultrasonic testing
d) Magnetic particle testing
Rationale: Liquid penetrant testing (PT) is highly effective for detecting
surface-breaking defects in non-porous materials.
4. The term “sensitivity” in liquid penetrant testing refers to:
a) Amount of penetrant applied
b) Ability to detect small discontinuities
c) Thickness of the part
d) Type of developer used
Rationale: Sensitivity indicates the capability of the penetrant system
to reveal small or fine surface defects.
, 5. Which type of ultrasonic wave is most commonly used in thickness
measurements?
a) Surface wave
b) Lamb wave
c) Longitudinal wave
d) Shear wave
Rationale: Longitudinal ultrasonic waves travel through the thickness
of the material and are commonly used for thickness gauging due to
their direct path and speed.
6. Magnetic particle testing is applicable only to:
a) All metals
b) Ferromagnetic materials
c) Non-ferrous metals
d) Plastics
Rationale: Magnetic particle testing (MT) relies on magnetization of
the material, which is effective only for ferromagnetic materials like
iron and steel.
7. In radiographic testing, a “penumbra” effect refers to:
a) A shadow that improves image quality
b) The edge unsharpness on a radiograph
, c) A chemical reaction in the developer
d) A type of defect in welds
Rationale: The penumbra is the blurry edge seen in radiographs
caused by geometric unsharpness due to the finite size of the radiation
source.
8. Which of the following is a limitation of liquid penetrant testing?
a) Can detect surface cracks
b) High sensitivity
c) Cannot detect subsurface defects
d) Simple to apply
Rationale: PT is limited to detecting defects open to the surface and is
ineffective for internal discontinuities.
9. In ultrasonic testing, the “attenuation” of a wave is:
a) Reflection at the surface
b) Loss of wave energy as it propagates
c) Increase in velocity
d) Wave generation at the transducer
Rationale: Attenuation refers to the reduction of ultrasonic wave
amplitude due to absorption, scattering, and other energy losses
within the material.
Questions With Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. Which of the following is the primary purpose of non-destructive
testing (NDT)?
a) To destroy defective materials
b) To detect defects without damaging the test object
c) To improve the mechanical properties of materials
d) To verify chemical composition
Rationale: The main purpose of NDT is to evaluate the properties or
detect defects in a material, component, or assembly without causing
damage, allowing continued use.
2. In radiographic testing, the contrast on a radiograph is primarily
influenced by:
a) Exposure time
b) Film size
, c) Material thickness and density differences
d) Type of developer
Rationale: Contrast is the difference in optical density between areas
of the radiograph, which depends on the varying absorption of
radiation due to differences in material thickness or density.
3. Which NDT method is most suitable for detecting surface cracks in
metals?
a) Radiographic testing
b) Liquid penetrant testing
c) Ultrasonic testing
d) Magnetic particle testing
Rationale: Liquid penetrant testing (PT) is highly effective for detecting
surface-breaking defects in non-porous materials.
4. The term “sensitivity” in liquid penetrant testing refers to:
a) Amount of penetrant applied
b) Ability to detect small discontinuities
c) Thickness of the part
d) Type of developer used
Rationale: Sensitivity indicates the capability of the penetrant system
to reveal small or fine surface defects.
, 5. Which type of ultrasonic wave is most commonly used in thickness
measurements?
a) Surface wave
b) Lamb wave
c) Longitudinal wave
d) Shear wave
Rationale: Longitudinal ultrasonic waves travel through the thickness
of the material and are commonly used for thickness gauging due to
their direct path and speed.
6. Magnetic particle testing is applicable only to:
a) All metals
b) Ferromagnetic materials
c) Non-ferrous metals
d) Plastics
Rationale: Magnetic particle testing (MT) relies on magnetization of
the material, which is effective only for ferromagnetic materials like
iron and steel.
7. In radiographic testing, a “penumbra” effect refers to:
a) A shadow that improves image quality
b) The edge unsharpness on a radiograph
, c) A chemical reaction in the developer
d) A type of defect in welds
Rationale: The penumbra is the blurry edge seen in radiographs
caused by geometric unsharpness due to the finite size of the radiation
source.
8. Which of the following is a limitation of liquid penetrant testing?
a) Can detect surface cracks
b) High sensitivity
c) Cannot detect subsurface defects
d) Simple to apply
Rationale: PT is limited to detecting defects open to the surface and is
ineffective for internal discontinuities.
9. In ultrasonic testing, the “attenuation” of a wave is:
a) Reflection at the surface
b) Loss of wave energy as it propagates
c) Increase in velocity
d) Wave generation at the transducer
Rationale: Attenuation refers to the reduction of ultrasonic wave
amplitude due to absorption, scattering, and other energy losses
within the material.
