Propagation of Sound through Solids, Liquids and Gases

Q.

What Is the Main Function of Larynx?

Q.

The velocity of sound is maximum in

1. Water

2. Oil

3. air

4. iron

Q.

Ultrasonic waves are those waves:

1. which a man can hear

2. which a man cannot hear

3. which are of high velocity

4. which are of high amplitude

Q. A sound is travelling in air at a speed of $343m{s}^{-1}$. The wavelength of the sound wave is $0.1cm$. Find the frequency of the sound wave.

1. $543000Hz$
2. $343000Hz$
3. $400000Hz$
4. $633000Hz$

Q.

(a) When we put our ear to a railway line, we can hear the sound of an approaching train even when the train is far off but its sound cannot be heard through the air. Why ?

(b) How could you convince a small child that when you speak, it is not necessary for air to travel from your mouth to the ear of a listener ?

Q. The velocity of sound in air is $336\text{m/s}$ and in water it is $1440\text{m/s}$. Wavelength of sound waves in air is $1.75\text{m}$. What is the frequency and wavelength of sound waves in water? $\left[7\text{marks}\right]$

Q.

Which of the following correctly represents the increasing order of frequency for infrasound, ultrasound, and audible range?

Q. A ship sends a sonar wave to the sea bed which is flat and measured several times over a large area. One day the reflected sound wave takes longer time than in previous measurements. The possible reason is:

1. The frequency of the sonar wave, generated by the equipment is higher than previous measurements.
2. There is a solid object of large size in the path of sonar wave.
3. There is a huge air bubble in the path of sonar wave.
4. The loudness of the sonar wave, generated by the equipment is lower than previous measurement.

Q.

Write three characteristics of the medium required for the propagation of sound.

Q. A sound wave is passing through air column in the form of compression and rarefaction. In consecutive compression and rarefaction:

1. density remains constant
2. Boyle's law is obeyed
3. bulk modulus of air oscillates
4. there is no transfer of heat

Q. How does a man's voice differ from a woman's voice ?

Q. Sound wave travelling through air is a:

1. Longitudinal wave
2. Mechanical wave
3. Electromagnetic wave
4. Transverse wave

Q.

The distance between a compression and its next rarefaction, in a sound wave of wavelength $\lambda$, will be:

1. $\frac{\lambda }{2}$

2. $\frac{\lambda }{4}$

3. $\frac{\lambda }{8}$

4. $\frac{\lambda }{16}$

Q. A pirate ship is looking for a sunken ship under sea.SONAR was launched vertically downwards and it took 2.32s to come back.If the seabed is 1700m , have the found a sunken ship? If yes, what's the height of the sunken ship?

Q. Sound will travel fastest in :

1. Air
2. Steel
3. Water
4. Vacuum

Q. Sound travels in air if

1. there is no moisture in the aimosphere
2. particles of medium travel from one place to another
3. both particles as well as disturbance travel from on e place to another.
4. disturbance moves

Q.

What is the audible range of the average human ear?

Q. On the moon, one cannot hear sound, as there is no medium for propagation of sound wave.

1. True
2. False

Q.

A ship sends a sonar wave to the sea bed which is flat and measured several times over a large area. One day the reflected sound wave takes longer time than in previous measurements. The possible reason is:

1. There is a solid object of large size in the path of sonar wave.

2. The loudness of the sonar wave, generated by the equipment is lower than previous measurement.

3. The frequency of the sonar wave, generated by the equipment is lower than previous measurements.

4. There is a huge air bubble in the path of sonar wave.

Q. A big explosion on the Moon cannot be heard on the Earth. Which of the following is the correct explanation for this?

1. The explosion produces high frequency sound waves which are inaudible.
2. There is no medium between the Earth and the Moon.
3. Sound waves are absorbed by the Moon’s atmosphere.
4. Sound waves are absorbed by the Earth’s atmosphere.

Q. Propagation of sound can be visualized as:

1. Propagation of density variations
2. Propagation of pressure variations
3. Series of compressions and rarefactions
4. All of the above.

Q. In which of the following media does sound travel the fastest?

1. Solids
2. Liquids
3. Gases
4. Same in all media

Q. Choose the correct option comparing the speed of sound in different media.

1. Steel $<$ Seawater $<$ Oxygen
2. Oxygen $<$ Seawater $<$ Steel
3. Oxygen $<$ Steel $<$ Seawater
4. Steel $<$ Oxygen $<$ Seawater