Propagation of Sound

Q. The speed of sound in air at $0^{\circ }C$ is:

1. $\text{332 m/s}$
2. $\text{211 m/s}$
3. $\text{340 m/s}$
4. $\text{350 m/s}$

Q. Question 22
How is sound produced and how is it transmitted and heard by us?

Q.

The velocity of sound is highest in :

1. air

2. water

3. glass

4. vacuum

Q.

Sound is a form of energy.

1. True

2. False

Q.

In which state of matter does sound travel with maximum velocity?

Q. Can sound travel through solids and liquids? In which of these two does it travel faster?

Q.

Discuss the parts of the ear that gives us the ability to discriminate different pitches of sound.

Q.

Instruments have air columns, which vibrate and produce sound.

Q.

Give two examples of wind instruments.

Q.

Does distance affect frequency?

Q. In the experiment shown, the bell is heard ringing. The air is gradually pumped out of the jar. No change is made to the ringing bell. After a few minutes the bell can no longer be heard. Why is this?

1. The amplitude of vibration of the bell decreases.
2. The sound waves from the bell become transverse.
3. The sound waves need a medium to travel through.
4. The frequency of vibration of the bell increases.

Q.

Sound wave needs a medium for its propagation.

1. No

2. Yes

Q.

The __________ in ear senses the vibrations of sound, it sends the signals to the brain.

1. Larynx

2. Eardrum

3. Voice box

4. None of these

Q.

Sound does not propagate in vacuum.

1. True

2. False

Q.

Vibrations cause sound. So if there are more vibrations sound will travel faster. In solids molecules are fixed, then how can sound travel faster in solids?

Q.

How do we perceive sound?

Q.

Explain the working of a wind instrument?

Q. Sound vibrations are converted into electrical signals by _________ present in inner the ear.

1. 
   ossicles
2. 
   cochlea
3. 
   eardrum
4. 
   pinna

Q. What type of materials REFLECT sound?

1. hard materials
2. both hard and smooth materials
3. smooth materials
4. porous materials

Q.

Sound travels in the form of _____.

1. waves

2. particles

3. either particles or waves, depending on the medium

4. both as waves and particles

Q.

The decrease in the length of the air column of a wind instrument:

1. increases frequency

2. increases loudness

3. decreases frequency

4. no effect on frequency and loudness

Q. How you can prove that sound requires a medium to propagate?

Q.

There are two boxes A & B. Cell phones are kept in both the boxes, all air is sucked from box A and then closed by a device. While box B is simply closed by a device without sucking air from it. A call is made simultaneously on both the phones, but sound comes only from box B. This is because

Statement 1:In box B there are air particles to vibrate but in box A there is vacuum.

Statement 2 : Sound needs a medium for propagation.

1. Statement 1 is true but statement 2 is not the correct explanation of statement 1.

2. Statement 1 is true but statement 2 is false.

3. Statement 1 is true and statement 2 is the correct explanation of statement 1.

4. Statement 1 is false but statement 2 is true.

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

Q. Sound propagates by making the particles of a medium to oscillate about their fixed positions that influences the adjacent particles also to do the same.

1. False
2. True

Q.

Astronauts in space need not necessarily have any electronic device with them to communicate.

1. True

2. False

Q. Why do bursting of balloon sound similar to lightning

Q. of sound stops as soon as the vibration of the source stops.

1. Production
2. Propagation
3. Hearing

Q. Fill in the blanks​

• Sound travels faster in than in liquids​

Q.

An elastic rubber band is stretched between two points. Will it produce any sound?

1. Yes

2. No

3. Can't be said

4. None of these