10 Questions MCQ Test Science Class 9 - Test: Ultrasound And Human Ear
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Detailed Solution for Test: Ultrasound And Human Ear - Question 1
Another popular use for ultrasonics is in ships, both for navigation and for locating objects underwater. Sound travels faster through water than through air, which is very helpful because light hardly travels through water at all. Most people know that whales can use low-frequency sound to communicate across entire oceans. Submarinesuse a similar trick with a type of navigation called sonar (sound navigation and ranging), which is a bit like an underwater equivalent of radar.
The vibrations or the pressure variations inside the inner ear are converted into electrical signals by the:
Detailed Solution for Test: Ultrasound And Human Ear - Question 3
The middle ear transmits the amplified pressure variations received from the sound wave to the inner ear. In the inner ear, the pressure variations are turnedinto electrical signals by the cochlea. These electrical signals are sent to the brain via the auditory nerve, and the brain interprets them as sound.
Which part of the ear amplifies the vibrations of eardrum?
Detailed Solution for Test: Ultrasound And Human Ear - Question 4
The pressure from sound waves makes the eardrum vibrate. The vibrations are transmitted further into the ear via three bones in the middle ear: the hammer(malleus), the anvil (incus) and the stirrup (stapes).
Detailed Solution for Test: Ultrasound And Human Ear - Question 5
Human beings can normally hear sounds with a frequency between about 20 Hzand 20,000 Hz. Sounds with frequencies below 20 hertz are called infrasound.Infrasound is too low-pitched for humans to hear. Sounds with frequencies above 20,000 hertz are called ultrasound.
Detailed Solution for Test: Ultrasound And Human Ear - Question 7
When bats detect ultrasonic waves which after touching the prey comes back to bats ear which tell them how far their prey is and how it looks like. Similarly people detect ultrasonic waves to know the distance. the waves touch the building and comes back which tells us how far it is.
A ship on the surface of water sends a signal and receives it back after 4 seconds from a submarine inside the water. Calculate the distance of the submarine from the ship (The speed of sound in water is 1450 m/s).
Detailed Solution for Test: Ultrasound And Human Ear - Question 10
2 D = velocity X time
D = (velocity X time) / 2 = 1450 X 4 / 2 = 2900 m = 2.9 km
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