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# Test: Reflection Of Sound

## 10 Questions MCQ Test Science Class 9 | Test: Reflection Of Sound

Description
This mock test of Test: Reflection Of Sound for Class 9 helps you for every Class 9 entrance exam. This contains 10 Multiple Choice Questions for Class 9 Test: Reflection Of Sound (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Reflection Of Sound quiz give you a good mix of easy questions and tough questions. Class 9 students definitely take this Test: Reflection Of Sound exercise for a better result in the exam. You can find other Test: Reflection Of Sound extra questions, long questions & short questions for Class 9 on EduRev as well by searching above.
QUESTION: 1

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

Solution:

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.

QUESTION: 2

### A stethoscope utilizes the principle of

Solution:

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.

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.

Solution:
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
QUESTION: 4

In which medium sound travels faster ?

Solution: 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.
QUESTION: 5

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

Solution:

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.

QUESTION: 6

Audible range of sound of human being is

Solution:
QUESTION: 7

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

Solution:
QUESTION: 8

Reverberation produced in large auditoriums is due to:

Solution:
QUESTION: 9

When sound gets reflected from a surface

Solution:
QUESTION: 10

Minimum time interval for hearing a distinct echo is​

Solution: