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Test: Production And Propagation Of Sound - Class 9 MCQ


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10 Questions MCQ Test Science Class 9 - Test: Production And Propagation Of Sound

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

Sound is produced by _________objects.

Detailed Solution for Test: Production And Propagation Of Sound - Question 1

It vibrates, which, in turn, causes the air around it to vibrate. The vibration of air causes your eardrum to vibrate in tune with the vibrating air. This is interpreted by your brain as sound.

 

Test: Production And Propagation Of Sound - Question 2

You can not talk to each other on the moon because

Detailed Solution for Test: Production And Propagation Of Sound - Question 2

Sound needs a medium to be transmitted thus a person on the moon cannot hear another person on the moon. This is because there is no air on the moon and it is a vaccum thus there is no medium for sound waves to travel.

Test: Production And Propagation Of Sound - Question 3

The motion of the particles of a medium when a sound wave is passing through it is:

Detailed Solution for Test: Production And Propagation Of Sound - Question 3

The motion of the particles of a medium when a sound wave is passing through it is oscillatory because the particles move forward set the neighbouring particle into motion and then come back to it's original position. The particles move to and fro which is also called oscillatory motion.

Test: Production And Propagation Of Sound - Question 4

Which of the following quantities is transferred during wave propagation?

Detailed Solution for Test: Production And Propagation Of Sound - Question 4

A wave can be thought of as a disturbance or oscillation that travels through space-time, accompanied by a transfer of energy. The direction a wave propagates is perpendicular to the direction it oscillates for transverse waves. A wave does not move mass in the direction of propagation; it transfers energy.

Test: Production And Propagation Of Sound - Question 5

Sound is produced when

Detailed Solution for Test: Production And Propagation Of Sound - Question 5

Sound is produced when something vibrates. The vibrating body causes the medium (water, air, etc.) around it to vibrate. Vibrations in air are called traveling longitudinal waves, which we can hear.

Test: Production And Propagation Of Sound - Question 6

Sound waves in air are

Detailed Solution for Test: Production And Propagation Of Sound - Question 6

Sound waves in air comprise of compressions and rarefactions. These compressions and rarefactions vibrate in a direction parallel to the direction of wave propagation, which is the fundamental prperty of a longitudinal wave. Hence, sound waves in air are longitudinal waves.

Test: Production And Propagation Of Sound - Question 7

In longitudinal waves, how does the particle of medium vibrate compared to the direction of propagation of wave?

Detailed Solution for Test: Production And Propagation Of Sound - Question 7

If the particles of the medium vibrate in a direction perpendicular to the direction of propagation of the wave, it is called a transverse wave. In transverse waves, the particle movement is perpendicular to the direction of wave propagation.

Test: Production And Propagation Of Sound - Question 8

Which of the following will does not allow sound propagation?

Detailed Solution for Test: Production And Propagation Of Sound - Question 8

Sound cannot travel through vacuum. It needs a material medium to propagate.

Test: Production And Propagation Of Sound - Question 9

Which of the following is a mechanical wave?

Detailed Solution for Test: Production And Propagation Of Sound - Question 9

Sound have the mechanical waves because it required to move their medium (solid, liquid or gas)and sound always move in medium.

Test: Production And Propagation Of Sound - Question 10

The method of detecting the presence, position and direction of motion of distant objects by reflecting a beam of sound waves is known as _____.

Detailed Solution for Test: Production And Propagation Of Sound - Question 10

It is used in SONAR (Sound Navigation and Ranging) to determine the depth of the sea and to locate underwater objects like sunken ships, hills, icebergs, etc. The formula used is:

  

 

2d = v × t

Where, d = depth of the sea

v = velocity of the sound in the medium

t = time interval between transmission and reception of the ultrasounds.

It is used to detect cracks and flaws in metal blocks.

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