Compression and Rarefaction

Q.

How is a females voice different from a males voice ?

Q. Shrillness of a sound is determined by the _______ of vibration.

Q.

How does the length of the air column contribute to the pitch being higher or lower?

Q.

On which of the following factors does the shrillness of the sound wave depend?

1. Amplitude

2. Loudness

3. All of these

4. Frequency

Q.

A sound source produce 40 compressions and 40 rarefactions in 0.4 seconds? What is the frequency?

Q. A region of sound wave, where the air is at low pressure and low density.

1. compression
2. can be both
3. rarefaction
4. cannot be determined

Q. The pitch of Sound depends upon its-
a. Amplitude
b. Frequency
c. Quality
d. None of these

Q.

In a sound wave, compression is the region of the low pressure.

1. True

2. False

Q. Rarefaction is a region of

1. low frequency.
2. low pressure.
3. high frequency.
4. high pressure.

Q. The sum of number of compressions and rarefactions produced by a sound wave per second is 200. The frequency of sound wave is

1. 50
2. 150
3. 100
4. 200

Q. We can distinguish between a man’s and a woman’s voices equally loud without seeing them. This is due to a property of sound that measures the shrillness. Can you choose the correct unit of the quantity on which this characteristic of sound depends?

1. Hertz
2. Metre/sec
3. Metre
4. Unitless

Q. When the frequency of a sound wave is changed, the shrillness of the sound changes.

1. True
2. False

Q. Find the frequency of the tuning fork which produces 200 compression and 200 rarefaction in 1 second.

1. 100 Hz
2. 200 Hz
3. 300 Hz
4. 400 Hz

Q.

Electromagnetic waves travel with the speed of _____ ms^–1. in vaccum.

Q. The sound produced by two different instruments have different frequencies but the same amplitude. Which of these attributes of the sound will vary?

1. Loudness
2. Quality
3. None of these
4. Pitch

Q.

When I close the door strongly, then why does window near vibrates?

Q. Shrillness of a sound is determined by the _______ of vibration.

Q. Compare the sound of a baby with the sound of a man. Even if both have the same loudness, how they differ. Explain the factor which causes the difference.

Q. The shrillness of a sound is called as ___.

1. amplitude
2. frequency
3. loudness
4. pitch

Q. An object oscillates 20 times in 5 seconds. What would be its frequency ?

1. 2 Hz
2. 4 Hz
3. 6 Hz
4. 8 Hz

Q.

A source of wave produces 40 crests and 40 troughs in 0.4 seconds.Find the frequency of the wave.

Q. A drum vibrating at lower frequency will surely have _______.

1. higher pitch
2. lower pitch
3. higher loudness
4. lower loudness

Q. When a region of a sound wave is in the state of compression ___.

1. it has high pressure, low density
2. it has low pressure, high density
3. it has high pressure, high density
4. it has low pressure, low density

Q. State whether true or false :

1. True
2. False

Q. When we increase the number of vibrations per second then:

1. frequency decreases.
   
2. pitch decreases.
   
3. the sound becomes flat.
   
4. the sound becomes shrill.
   

Q. Match the sounds in column I with the correct group in column II.

Column I	Column II
a. a child whispering to another in class	i. high pitch, loud sound
b. the whine of a mosquito near your ears	ii. high pitch, soft sound
c. the bells of fire engines rushing past	iii. low pitch, loud sound
d. the ticking of a clock	iv. low pitch, soft sound

Q. How can we identify different instrument in orchestra while it is played in same pitch?

Q. A sound is said to be of rich quality when it contains

1. a note of high amplitude
2. only the fundamental frequency
3. a note of high frequency
4. many harmonics

Q. The propagation of sound does not occur through ______.

1. Solids
2. Vacuum
3. Gases
4. Liquids

Q. In a sound wave, compression is a region of ______.

1. high pressure and low density
2. high pressure and high density
3. low pressure and high density
4. low pressure and low density