Physics Waves DUHS 2022
PMDC Verified Question 69 of 125
An object moving faster than the speed of sound. This object is called:
A
Sonic
B
Supersonic
C
Hypersonic
D
Ultrasonic
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Supersonic
Concept:

Speeds are categorized relative to the local speed of sound (Mach number).

Solution:

  • Subsonic: Slower than sound (Mach < 1).


  • Sonic: Exactly at the speed of sound (Mach = 1).


  • Supersonic: Faster than the speed of sound (Mach > 1). Objects breaking this barrier create shock waves (sonic booms).


  • Hypersonic: Significantly faster than sound, typically classified as Mach 5 or greater.


Why other options are incorrect:

Ultrasonic refers to sound wave frequencies above human hearing (e.g., > 20 kHz), not the physical speed of a moving object.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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