Which one of the following statements is not correct ?

Asked in UPSC NDA 2 2017 · Topic: Sound (Ultrasound and Infrasound: Production, Properties, and Applications (SONAR, Medical, Industrial))

1. Ultrasonic waves cannot get reflected, refracted or absorbed.
2. Ultrasonic waves are used to detect the presence of defects like cracks, porosity, etc. in the internal structure of common structure materials.
3. Ultrasonic waves can be used for making holes in very hard materials like diamond.
4. Ultrasonic waves cannot travel through va‐ cuum.

More Physics questions

• The frequency of ultrasound waves is
• Compared to audible sound waves, ultrasound waves have
• SONAR is a device that is used to measure the distance of underwater objects by a ship. Which of the following types of waves does it use for this purpose?
• In SONAR, we use
• The speed of ultrasonic wave in air is
• Which specific waves are used in SONAR?
• SONAR is mostly used by
• Exploration of underwater petroleum deposits is done by

All 2,629 Physics questions →