Pitch

Q.

“He is playing cricket” change in passive voice.

Q.

A resonance tube is old and has a jagged end. It is still used in the laboratory to determine the velocity of sound in the air. A tuning fork of frequency $512Hz$ produces the first resonance when the tube is filled with water to a mark $11cm$ below a reference mark, near the open end of the tube. The experiment is repeated with another fork of frequency $256Hz$ which produces the first resonance when water reaches a mark $27cm$ below the reference mark. The velocity of sound in air, obtained in the experiment, is close to

1. $322m{s}^{-1}$

2. $341m{s}^{-1}$

3. $335m{s}^{-1}$

4. $328m{s}^{-1}$

Q.

Which of the following physical quantities remains unchanged when a sound wave enters from one medium to another?

1. Amplitude

2. Frequency

3. Wavelength

4. Loudness

Q.

Characteristic of sound by which we can distinguish between a shrill and a grave sound is known as:-

1. Wavelength

2. Pitch

3. Amplitude

4. Loudness

Q.

What happens to the pitch of a sound if its frequency increases ?

Q.

How does the pitch of a sound depend on frequency ?

Q.

Guess which sound has a higher pitch: guitar or car horn?

Q.

The voice of a woman has a lower pitch than that of a man.

1. True
2. False

Q. The pitch of sound is determined by its:

1. Frequency
2. Speed
3. Intensity
4. Amplitude

Q.

What is another word for a high-pitched sound?

Q.

The loudness of sound depends on the frequency.

1. True
2. False

Q.

Name the three characteristics of sound.

Q.

Buzzing of mosquito is example of __________sound.

Q.

Why do we hear buzzing bees but not pendulum vibrations?

Q.

The girls generally have ____ voice whereas the voice of the boys is____.

Q.

Doppler phenomenon is related with

1. Pitch [Frequency]

2. Loudness

3. Quality

4. Reflection

Q.

What is the range of frequency to which a human ear is sensitive?

Q.

Women have shorter vocal cords, hence, their voice is high-pitched and shrill.

1. True
2. False

Q. What is the S.I. unit of the quantity which the pitch/shrillness of sound depends upon?

1. hertz
2. metre
3. metre/second
4. decibel

Q.

Correct the whole passage-

The amplitude of vibration of a sound wave determines its pitch. The higher the frequency of the sound wave, the lower is its pitch, and hence shriller is the sound produced. Similarly, a sound wave of lower frequency has a low pitch and hence a shriller sound is produced. For example, a mans voice is shriller than a womans voice. Some examples of low pitch sounds are the screaming of a child and the buzzing of mosquitoes whereas examples of high pitch sounds are the beating of a drum and the roaring of a lion.

Q.

What is natural frequency? What factors it depends in a vibrating string?

Q.

Galtons whistle is a whistle that can produce frequencies greater than

1. 2, 000 Hz

2. 20, 000 Hz

3. 200 Hz

Q. State three characteristics of a musical sound. On what factors do they depend.

Q. In a wind instrument, short column of air makes a low pitch sound.

1. True​​​​​​
2. False

Q. Two sounds having wavelengths $1.3m$ and $3.9m$ have the same speed in a medium. A person listens to these sounds. What difference would the listener feel?

1. First sound is heard with higher pitch.
2. First sound is heard with better quality.
3. First sound is louder.
4. Second sound is heard with higher pitch.

Q.

(a) Explain the term pitch of a sound. On what factor does the pitch of a sound depend ?

(b) Draw labelled diagrams to represent sound of (a) low pitch, and (b) high pitch, of the same loudness.

Q.

Why cant we hear the sound produced by a vibrating pendulum?

Q. If the sound is of high pitch, then it's frequency will be:

1. Zero
2. Low
3. Infinite
4. High

Q.

Loudness of the sound directly Proportional to the

1. square of amplitude of vibration

2. Half of amplitude of vibration

3. Double of amplitude of vibration

Q. High pitched sound : Whistling : : Low pitched sound : ................

1. Roar of a lion
2. Woman's scream
3. Chirping of birds
4. Crying of babies