ASNT Level II Ultrasonic Testing (UT)
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
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1. Which principle is the basis of ultrasonic testing?
A. Magnetic induction
B. Sound wave propagation in elastic media
C. Radiographic ionization
D. Thermal conduction
B. Sound wave propagation in elastic media
Ultrasonic testing operates by transmitting high-frequency sound
waves through a material and analyzing reflections caused by
discontinuities or boundaries.
2. Which frequency range is most commonly used in industrial ultrasonic
testing?
A. 20–200 Hz
B. 2–20 kHz
C. 0.5–25 MHz
D. 50–200 MHz
C. 0.5–25 MHz
, Industrial ultrasonic testing typically uses megahertz frequencies to
balance penetration and resolution.
3. What occurs when ultrasound encounters a boundary between two
materials with different acoustic impedances?
A. Complete transmission only
B. Reflection and transmission
C. Absorption only
D. Conversion to heat only
B. Reflection and transmission
A change in acoustic impedance causes part of the wave to reflect
and part to transmit through the interface.
4. Which law governs the relationship between incident and refracted
ultrasonic angles?
A. Newton’s Law
B. Snell’s Law
C. Hooke’s Law
D. Boyle’s Law
B. Snell’s Law
Snell’s Law defines how ultrasonic waves change direction when
passing between materials with different velocities.
5. What is the primary function of a couplant in UT?
A. Amplify signal
B. Reduce electrical noise
C. Eliminate air gaps between probe and test surface
D. Increase frequency
C. Eliminate air gaps between probe and test surface
Couplant ensures efficient transmission of ultrasonic energy by
removing air, which strongly reflects sound waves.
, 6. What is meant by the “near field” in ultrasonic testing?
A. Region of uniform beam intensity
B. Region of random scattering only
C. Area close to the transducer with complex wave interference
D. Region beyond material thickness
C. Area close to the transducer with complex wave interference
The near field is characterized by fluctuating intensity due to wave
interference patterns close to the probe.
7. Which property primarily affects ultrasonic wave velocity in a
material?
A. Color of material
B. Elastic modulus and density
C. Surface roughness only
D. Electrical conductivity
B. Elastic modulus and density
Wave velocity depends on stiffness and density, which determine
how fast vibrations travel through a material.
8. What is the main purpose of calibration in UT?
A. Increase sound intensity
B. Ensure accuracy of measurements and defect detection
C. Change wave mode
D. Reduce frequency
B. Ensure accuracy of measurements and defect detection
Calibration ensures the instrument provides reliable and traceable
measurement results.
9. Which type of wave mode is most commonly used for surface
inspection?
A. Longitudinal waves
B. Shear waves
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1. Which principle is the basis of ultrasonic testing?
A. Magnetic induction
B. Sound wave propagation in elastic media
C. Radiographic ionization
D. Thermal conduction
B. Sound wave propagation in elastic media
Ultrasonic testing operates by transmitting high-frequency sound
waves through a material and analyzing reflections caused by
discontinuities or boundaries.
2. Which frequency range is most commonly used in industrial ultrasonic
testing?
A. 20–200 Hz
B. 2–20 kHz
C. 0.5–25 MHz
D. 50–200 MHz
C. 0.5–25 MHz
, Industrial ultrasonic testing typically uses megahertz frequencies to
balance penetration and resolution.
3. What occurs when ultrasound encounters a boundary between two
materials with different acoustic impedances?
A. Complete transmission only
B. Reflection and transmission
C. Absorption only
D. Conversion to heat only
B. Reflection and transmission
A change in acoustic impedance causes part of the wave to reflect
and part to transmit through the interface.
4. Which law governs the relationship between incident and refracted
ultrasonic angles?
A. Newton’s Law
B. Snell’s Law
C. Hooke’s Law
D. Boyle’s Law
B. Snell’s Law
Snell’s Law defines how ultrasonic waves change direction when
passing between materials with different velocities.
5. What is the primary function of a couplant in UT?
A. Amplify signal
B. Reduce electrical noise
C. Eliminate air gaps between probe and test surface
D. Increase frequency
C. Eliminate air gaps between probe and test surface
Couplant ensures efficient transmission of ultrasonic energy by
removing air, which strongly reflects sound waves.
, 6. What is meant by the “near field” in ultrasonic testing?
A. Region of uniform beam intensity
B. Region of random scattering only
C. Area close to the transducer with complex wave interference
D. Region beyond material thickness
C. Area close to the transducer with complex wave interference
The near field is characterized by fluctuating intensity due to wave
interference patterns close to the probe.
7. Which property primarily affects ultrasonic wave velocity in a
material?
A. Color of material
B. Elastic modulus and density
C. Surface roughness only
D. Electrical conductivity
B. Elastic modulus and density
Wave velocity depends on stiffness and density, which determine
how fast vibrations travel through a material.
8. What is the main purpose of calibration in UT?
A. Increase sound intensity
B. Ensure accuracy of measurements and defect detection
C. Change wave mode
D. Reduce frequency
B. Ensure accuracy of measurements and defect detection
Calibration ensures the instrument provides reliable and traceable
measurement results.
9. Which type of wave mode is most commonly used for surface
inspection?
A. Longitudinal waves
B. Shear waves
