Extra questions for Class 9 Sound

Given below are the Class 9 Science Extra Questions for Sound
(a) Match thec column
(b) Very short answer type
(c) Short answer type
(d) Long answer questions

Match the column

Question 1 Extra questions for Class 9  Sound Chapter 12

Very Short answer type

Question 2 Name two animals which can produce infrasonic waves.

Question 3
What is reverberation?

Question 4
What is echo?

Question 5
What is infrasonic? Give an example.

Question 6
Give examples of organisms which can hear infrasonic?

Question 7
What are infrasonic and ultrasonic sounds?

Question 8
What is the audible range of human ear?

Question 9
Why do we hear sound of an approaching truck before the truck reaches us?

Question 10
What is the frequency of wave with time period 0.025 s?

Question 11
A baby recognizes her mother by her voice. Name the characteristic of sound involved

Short Answer type

Question 12.
A person hears an echo from the top of a tower, 2.2 sec after the sound is produced. How far away is the tower from the person? Speed of the sound in air is 332m/s?

Question 13.
How can multiple echoes of a single sound be produced? Explain?
Question 14.
How temperature affects the velocity of sound?
Question 15.
When a sound is reflected from a distant object, an echo is produced and heard on a winter night. Will you hear the echo of the same sound on a summer day if the distance between reflecting surface and the source of sound remains the same? Justify your answer?
Question 16.
Why are the walls and roof of an auditorium covered with sound absorbent materials?
Question 17.
Define reverberation. What arrangements should be made in an auditorium to control excessive reverberation?
Question 18.
Determine the minimum distance between the listener and reflector for an echo to be heard dintinctively of a sound propagating with a speed v m/s?

Question 19.
Name the sound of the following frequencies:

Question 20.
What is the frequency of a wave whose time period is 0.05s?

Question 21.
A ship is stationary is at a distance of 2800m from the sea-bed. The ship sends an ultrasound signal to the sea-bed and its echo is heard after 4s. Find the speed of sound in water?
Question 22.
How do the frequency and amplitudes affect musical sound?
Question 23. A hospital uses an ultrasonic scanner to locate tumors in a tissue. What is the wavelength of ultrasound in a tissue in which the speed of ultrasound is 1.5km/sec2 ? The operating frequency of the scanner is 4.0 MHz?
Question 24.
A ship sends out ultrasound that returns from the sea-bed and is detected after 3.22sec. If the speed of ultrasound in sea water is 1530m/s, calculate the distance of the sea-bed from the ship?
Question 25
What is SONAR? For what it is used?

Long Answer type

Question 26.
How bats can detect their prey?
Question 27.
A body is vibrating 6000times in one minute. If the velocity of sound in air is 360m/s, Find:
(a)Frequency of the vibration in Hz
(b)Wavelength of sound produced
Question 28.
Explain with the help of a diagram the working of SONAR?
Question 29.
State any two characteristics of a wave motion?
Question 30.
Explain how the human ear works?
Question 31.
Give two practical applications of reflection of sound waves?
Question 32.
Briefly mention three uses of ultrasound in the field of medicine?
Question 33.
Distinguish between transverse waves and longitudinal waves?
Question 34.
When vertically upward jerk is given to a string, transverse waves are formed? Give three reasons?
Question 35
A body is vibrating 12000 times in one minute. If the velocity of sound in air is 360 m/s, find:
(a) Frequency of vibration in hertz,
(b) Wavelength of the wave produced.


This Class 9 Extra questions for Sound is prepared keeping in mind the latest syllabus of CBSE . This has been designed in a way to improve the academic performance of the students. If you find mistakes , please do provide the feedback on the mail.

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