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Sound - Practice Test, Class 9 Science - Class 9 MCQ


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30 Questions MCQ Test - Sound - Practice Test, Class 9 Science

Sound - Practice Test, Class 9 Science for Class 9 2024 is part of Class 9 preparation. The Sound - Practice Test, Class 9 Science questions and answers have been prepared according to the Class 9 exam syllabus.The Sound - Practice Test, Class 9 Science MCQs are made for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Sound - Practice Test, Class 9 Science below.
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Sound - Practice Test, Class 9 Science - Question 1

When a wave travels through a medium ______.

Sound - Practice Test, Class 9 Science - Question 2

The minimum distance between the source and the reflector, so that an echo is heard is approximately equal to ______. 

Sound - Practice Test, Class 9 Science - Question 3

Bats detect the obstacles in their path by receiving the reflected ______. 

Sound - Practice Test, Class 9 Science - Question 4
When sound travels through air, the air particles ______. 
Sound - Practice Test, Class 9 Science - Question 5
The frequency of a wave travelling at a speed of 500 ms-1 is 25 Hz. Its time period will be ______. 
Sound - Practice Test, Class 9 Science - Question 6
The amplitude of a wave is ______. 
Sound - Practice Test, Class 9 Science - Question 7
Which of the following is not a characteristic of a musical sound?
Sound - Practice Test, Class 9 Science - Question 8
Sound waves do not travel through?
Sound - Practice Test, Class 9 Science - Question 9
The physical quantity, which oscillates in most waves, is?
Sound - Practice Test, Class 9 Science - Question 10
Sound waves are :
Sound - Practice Test, Class 9 Science - Question 11
The frequency which is not audible to the human ear is :
Sound - Practice Test, Class 9 Science - Question 12
The speed of sound in medium depends upon?
Sound - Practice Test, Class 9 Science - Question 13
Which of the following will remain unchanged when a sound wave travels in air or in water?
Sound - Practice Test, Class 9 Science - Question 14
 A sound source sends waves of 400 Hz. It produces waves of wavelength 2.5 m. The velocity of sound waves is :
Sound - Practice Test, Class 9 Science - Question 15
The time period of a vibrating body is 0.05 s. The frequency of waves it emits is?
Detailed Solution for Sound - Practice Test, Class 9 Science - Question 15
Frequency = 1/time period
frequency (nu) = 1/0.05
multiply 1 and 0.05 by 100 to take out the decimal .
you will get 100/ 5= 20 .
i.e frequency = 20 Hz
Sound - Practice Test, Class 9 Science - Question 16
A source of frequency of 500 Hz emits waves of wavelength 0.4 m, how long does the waves take to travel 600 m? 
Detailed Solution for Sound - Practice Test, Class 9 Science - Question 16
 
Sound - Practice Test, Class 9 Science - Question 17
Sound and light waves both :
Sound - Practice Test, Class 9 Science - Question 18
The method of detecting the presence, position and direction of motion of distant objects by reflecting a beam of sound waves is known as _____. 
Sound - Practice Test, Class 9 Science - Question 19
The technique used by bats to find their way or to locate food is _______. 
Sound - Practice Test, Class 9 Science - Question 20

An ultrasonic wave is sent from a ship towards the bottom of the sea. It is found that the time interval between the sending and receiving of the wave is 1.6 s. What is the depth of the sea, if the velocity of sound in the seawater is 1400 m/s?

Detailed Solution for Sound - Practice Test, Class 9 Science - Question 20
Total distance travelled by the ultrasonic waves=velocity of the ultrasonic waves*Total time taken by the ultrasonic waves 
Therefore, 
2*Depth of the sea=1400m/s*1.6s 
Depth of sea=1120m
    Sound - Practice Test, Class 9 Science - Question 21
    An example for mechanical wave. 
    Detailed Solution for Sound - Practice Test, Class 9 Science - Question 21
    A mechanical wave is a wave that is not capable of transmitting its energy through a vacuum. Mechanical waves require a medium in order to transport their energy from one location to another. A sound wave is an example of a mechanical wave. Sound wavesare incapable of traveling through a vacuum.
    Sound - Practice Test, Class 9 Science - Question 22
    Which of the following quantities is transferred during wave propagation?
    Sound - Practice Test, Class 9 Science - Question 23
     If a vibrator strikes the water 10 times in one second, then the frequency of wave is _________.  
    Detailed Solution for Sound - Practice Test, Class 9 Science - Question 23
    The amount of wave cycles a second is equivalent to the Frequency. There are ten wave cycles is one second.
    The unit of frequency is now Hz.
    1 vibration=1 hz,then 
    10 vibrations=1*10 
    =10Hz is the solution.

    Sound - Practice Test, Class 9 Science - Question 24

    Unit of wavelength is __________. 

    Sound - Practice Test, Class 9 Science - Question 25
    SI Unit of time period is __________. 
    Sound - Practice Test, Class 9 Science - Question 26
    The vibrations or the pressure variations inside the inner ear are converted into electrical signals by the_________. 
    Sound - Practice Test, Class 9 Science - Question 27
    Vibrations inside the ear are amplified by the three bones namely the _________ in the middle ear. 
    Sound - Practice Test, Class 9 Science - Question 28
    The persistence of audible sound due to the successive reflections from the surrounding objects even after the source has stopped to produce that sound is called _________. 
    Sound - Practice Test, Class 9 Science - Question 29
    What is the velocity of sound in water at room temperature?
    Detailed Solution for Sound - Practice Test, Class 9 Science - Question 29
    The temperature of water is greater than the air, in room temp. and the sound travels faster in high temp. therefore the velocity of sound in water is 1500 and in air is 340
    Sound - Practice Test, Class 9 Science - Question 30
    The unit of quantity on which pitch of the sound depends is :
    Detailed Solution for Sound - Practice Test, Class 9 Science - Question 30
    It is because  pitch is that characteristic of sound that depends on the frequency received by a human ear.
    and as we know that the S.I. unit of frequency is hertz therefore the unit of quantity on which pitch of the sound depends is hertz. 
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