Which one of the following statements is not correct ?

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Which one of the following statements is not correct ?

Ultrasonic waves cannot get reflected, refracted or absorbed.
Ultrasonic waves are used to detect the presence of defects like cracks, porosity, etc. in the internal structure of common structure materials.
Ultrasonic waves can be used for making holes in very hard materials like diamond.
Ultrasonic waves cannot travel through vacuum.
This question was previously asked in
UPSC NDA-2 – 2017
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The correct answer is A.
Statement A is incorrect. Like all mechanical waves, ultrasonic waves exhibit properties such as reflection, refraction, absorption, and diffraction when they interact with different media or obstacles.
Statement B is correct; ultrasonic testing (UT) is widely used in non-destructive testing to detect internal flaws in materials. Statement C is correct; high-intensity ultrasonic vibrations are used in ultrasonic machining to drill holes in hard materials. Statement D is correct; ultrasonic waves are mechanical waves and require a material medium (solid, liquid, or gas) to propagate, thus they cannot travel through a vacuum.

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