Ultrasound scanning/sonography and it's system (in hindi)

What is ultrasound scanning
How ultrasound produce with piezoelectric impact in sonography
Utilizes of ultrasound
Advantage and downside of sonography
Practical in competition test ssc, cgl, state exam, upsc.

https://ultrasoundclass.org/ultrasound-scanning-sonography-and-its-system-in-hindi/