UPSC NDA 2 2017 General Ability Solved Paper

Question : 130 of 150

Marks: +1, -0

Which one of the following statements is not correct?

[NDA II 2017]

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.

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