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Waves & Sound - Ultrasound MCQs

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Waves & Sound - Ultrasound

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CSS - PMS - CCE - PCS - General Science Waves & Sound - Ultrasound
Which industrial application uses ultrasound?
A. Increasing gravity
B. Detecting internal flaws in materials
C. Producing sunlight
D. Changing atomic number
Correct Answer: B
Ultrasonic non-destructive testing detects cracks and discontinuities by reflected waves.
CSS - PMS - CCE - PCS - General Science Waves & Sound - Ultrasound
Which animals famously use ultrasonic echolocation?
A. Most plants
B. Earthworms only
C. Elephants only
D. Bats
Correct Answer: D
Many bats emit and detect ultrasonic calls for navigation and hunting.
CSS - PMS - CCE - PCS - General Science Waves & Sound - Ultrasound
How does pulse-echo ultrasound determine distance?
A. By measuring the time taken for echoes to return
B. By counting electrons
C. By using gravity
D. By measuring color only
Correct Answer: A
Distance can be inferred from sound speed and round-trip travel time.
CSS - PMS - CCE - PCS - General Science Waves & Sound - Ultrasound
Which medical technique uses ultrasound to produce images inside the body?
A. Electrocardiography only
B. Endoscopy only
C. Radiography only
D. Ultrasonography
Correct Answer: D
Diagnostic ultrasound forms images from echoes of high-frequency sound waves.
CSS - PMS - CCE - PCS - General Science Waves & Sound - Ultrasound
What approximate frequency marks the upper limit of normal human hearing?
A. 2 MHz
B. 20 kHz
C. 200 Hz
D. 20 Hz
Correct Answer: B
The common textbook range is about 20 Hz to 20 kHz.
CSS - PMS - CCE - PCS - General Science Waves & Sound - Ultrasound
What is ultrasound?
A. Radio waves
B. Sound with frequency above the upper limit of human hearing
C. Visible light
D. Sound below 1 Hz only
Correct Answer: B
Ultrasound typically means frequencies above about 20 kHz.
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