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Q.

Speeds greater than five times the speed of sound (Mach 5) are often referred to as:

 A.

supersonic

 B.

transonic

 C.

ultrasonic

 D.

hypersonic

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Solution:
Option(D) is correct

Supersonic speed is a rate of travel of an object that exceeds the speed of sound (Mach 1).

Speeds greater than five times the speed of sound (Mach 5) are often referred to as hypersonic.

Flight during which only some parts of the air surrounding an object, such as the ends of rotor blades, reach supersonic speeds are called transonic. This occurs typically somewhere between Mach 0.8 and Mach 1.23


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