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Test: Reflection Of Sound - Class 9 MCQ


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10 Questions MCQ Test Science Class 9 - Test: Reflection Of Sound

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

The unit of quantity on which pitch of the sound depends is :

Detailed Solution for Test: Reflection Of Sound - Question 1

Pitch is that characteristic of sound that depends on the frequency received by a human ear, and as we know that SI unit of frequency is hertz therefore the unit of quantity on which the pitch of the sound depends is Hertz.

Test: Reflection Of Sound - Question 2

A stethoscope utilizes the principle of

Detailed Solution for Test: Reflection Of Sound - Question 2

Stethoscope is a medical instrument used by doctors to listen to the sounds produced within the human body, mainly in the heart and lungs, it works on the principle of multiple reflections of sound.

Test: Reflection Of Sound - Question 3

How far away is the cliff from the child, if a child hears an echo from a cliff 6 second after the sound produced by powerful horn? The velocity sound in air at 22°C is 344 m/s.

Detailed Solution for Test: Reflection Of Sound - Question 3
Let the distance between cliff and child be d m. Then, total distance traveled by the sound = 2d, Total time taken = 6 s
Then, velocity of sound = 2d/6s = d / 3 s
344 m/s = d / 3 s
d = 344 m/s * 3 s = 1032 m
Test: Reflection Of Sound - Question 4

In which medium sound travels faster ?

Detailed Solution for Test: Reflection Of Sound - Question 4
The speed of sound depends on the elasticity and density of the medium through which it is traveling. In general, sound travels faster in liquids than in gases and faster in solids than in liquids. The greater the elasticity and the lower the density, the faster sound travels in a medium.
Test: Reflection Of Sound - Question 5

To reflect sound waves from any surface, it should have dimensions

Detailed Solution for Test: Reflection Of Sound - Question 5

During reflection, sound waves obey the laws of reflections. To have an appreciable reflection of sound waves from any surface, it should have dimensions equal or larger than the wavelength of the sound waves failing on it. That us, a smaller object will not reflect the sound waves of larger wavelength.

Test: Reflection Of Sound - Question 6

Audible range of sound of human being is

Test: Reflection Of Sound - Question 7

We can hear the sound of the horn of an approaching car before the car reaches, because

Test: Reflection Of Sound - Question 8

Reverberation produced in large auditoriums is due to:

Test: Reflection Of Sound - Question 9

When sound gets reflected from a surface

Test: Reflection Of Sound - Question 10

Minimum time interval for hearing a distinct echo is​

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