Question 1

Ultrasound consists of sound waves of frequency:

Accepted Answer

above 20,000 Hz. Ultrasound is sound above the human audible limit of 20 kHz.

Question 2

The technique used by ships to find the depth of the sea using ultrasound is called:

Accepted Answer

SONAR. SONAR (Sound Navigation And Ranging) uses ultrasound echoes to measure depth and detect objects underwater.

Question 3

Ultrasound is used to detect cracks inside metal blocks because it:

Accepted Answer

is reflected back from a crack (a change in medium). A crack is a gap that reflects the ultrasound, revealing the flaw that a solid block would not.

Question 4

In hospitals, ultrasound is commonly used to:

Accepted Answer

image internal organs and a developing foetus (ultrasonography). Ultrasonography forms images of internal organs and the foetus using reflected ultrasound.

Question 5

Ultrasonic waves are used to clean spiral tubes and delicate machine parts because they can:

Accepted Answer

dislodge dirt particles from hard-to-reach places by vibration. High-frequency vibrations shake off dirt from otherwise inaccessible surfaces.

Question 6

Bats and dolphins navigate and locate prey mainly using:

Accepted Answer

ultrasound echoes (echolocation). They emit ultrasonic pulses and interpret the echoes to locate obstacles and prey — echolocation.

Ultrasound Applications — Homi Bhabha Exam Physics MCQs with Solutions

Questions with solutions