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1. The audible range of sound for human beings is
A. 2 Hz – 200 Hz
B. 20 Hz – 20000 Hz
C. 200 Hz – 200000 Hz
D. 2000 Hz – 20000 Hz
2. Sounds of frequency below 20 Hz are called
A. Ultrasound
B. Infrasound
C. Hypersound
D. Supersonic sound
3. Sounds of frequency above 20000 Hz are called
A. Audible sound
B. Infrasonic sound
C. Ultrasonic sound
D. Resonant sound
4. Which animal can hear sounds up to 25 kHz?
A. Human
B. Dog
C. Elephant
D. Whale
5. As people grow older, their ears become
A. More sensitive to higher frequencies
B. Less sensitive to higher frequencies
C. More sensitive to lower frequencies
D. Equally sensitive to all frequencies
6. Which animals communicate using infrasound?
A. Dolphins and bats
B. Whales and elephants
C. Cats and rats
D. Birds and bees
7. Before earthquakes, some animals get disturbed because
A. They sense high-frequency waves
B. They sense infrasound produced by earth movements
C. They feel heat changes
D. They sense magnetic fields
8. The vibrations of a pendulum fall under which sound category?
A. Audible sound
B. Infrasound
C. Ultrasound
D. Mechanical noise
9. Ultrasound is produced by
A. Humans
B. Bats and dolphins
C. Snakes
D. Cows
10. Moths can detect bats because
A. They produce louder sound
B. They sense ultrasonic squeaks of bats
C. They are faster flyers
D. They reflect bat waves
11. The hearing aid converts sound waves into
A. Light signals
B. Electrical signals
C. Heat signals
D. Magnetic waves
12. The amplified electrical signals in a hearing aid are sent to
A. Speaker
B. Ear canal directly
C. Battery
D. Receiver antenna
13. Ultrasound is used for cleaning because
A. It produces heat
B. It vibrates particles at high frequency, removing dirt
C. It dissolves materials
D. It changes chemical structure
14. Ultrasound can detect cracks in metal blocks because
A. It passes through only metals
B. It gets reflected by defects inside the metal
C. It melts the metal
D. It is visible as light
15. Ordinary sound waves cannot be used to detect defects because
A. Their wavelength is too long
B. They travel too fast
C. They do not reflect
D. They absorb into the metal
16. The technique of forming images of the heart using ultrasound is called
A. Echolocation
B. Echocardiography
C. Electrocardiogram
D. Sonochemistry
17. Ultrasonography is used to
A. View external wounds
B. Get images of internal organs
C. Measure temperature
D. Detect magnetic fields
18. During ultrasonography, ultrasonic waves are reflected from
A. Bones only
B. Regions of tissue density change
C. Air layers
D. Skin surface only
19. Ultrasonography is used during pregnancy to
A. Increase baby’s growth
B. Detect congenital defects and growth abnormalities
C. Produce X-rays
D. Change tissue density
20. Ultrasound can be used to break kidney stones because
A. It produces heat that melts stones
B. It produces shock waves that crush stones into fine grains
C. It dissolves stones chemically
D. It vibrates the bladder
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