Sound

1.	What is the characteristic of sound that distinguishes a female voice from a male voice called?
	A. Pitch of voice
	B. Departure
	C. Quality
	D. Strength Option “A” is correct. Pitch of a sound depends upon the frequency of waves. The greater the frequency, the higher is the pitch and vice versa. It is the pitch of sounds that enable us to distinguished between a sound of man and woman. Sound of a woman is shrill due to high pitch. Sound of a man is grave due to low pitch and low frequency.

2.	Which characteristic of sound makes a sound thick or thin?
	A. Intensity
	B. Pitch
	C. Quality
	D. None of these Option”B” is correct

3.	The voice of women is more sharp than that of men because the voice of women-
	A. Amplitude decreases
	B. Amplitude is greater
	C. Pitch is low
	D. Pitch is high Option”D” is correct. Women have shorter vocal cords which vibrate more quickly and produce a higher pitch, while in men the longer vocal cords vibrate with low frequencies giving them deeper voice. Thus, women have high-pitched or shriller voice as compared to men.

4.	Why does the voice of a small child sound dearer than the voice of a young man?
	A. The pitch of a child’s voice is lower than that of a man’s voice.
	B. The pitch of a child’s voice is higher than that of a man’s voice.
	C. Baby has more power
	D. None of the above Option “B” is correct. Men have vocal cords about 20 mm in length. Women have vocal cords about 5 mm long. Children have still very short (less than 5 mm and increases as they age) vocal cords. As the frequency of vibration of the vocal cord increases, the pitch of the sound produced by it increases. So, when, we go from man to woman, and then child, the frequency of vibration of their vocal cords increases due to which the pitch of their voices increases.

5.	The voice of women is shrill as compared to men because of the difference in their:
	A. frequency
	B. speed
	C. loudness
	D. all of these Option “A” is correct. The explanation for the correct option: C) Frequency Because of the high frequency of sound, women are shill than men. The high-pitched sound and pitch of a sound are determined by its frequency. The higher the pitch, the higher the pitch of the voice. Women’s voices are higher than men’s because the sounds produced by women’s vocal cords are higher than men’s. Because their vocal cords are small. Because their vocal cords are longer than men’s. The explanation for the incorrect options: A) Speed Sound wave velocity refers to the velocity at which a disturbance propagates from particle to particle. The speed of sound is defined as the distance traveled by a point of sound waves. Compression or decimation covered per unit time. The speed of sound remains the same at all frequencies of a particular medium under the same physical conditions. B) Loudness Loudness is a phenomenon of sound that depends on the amplitude of sound waves. If the amplitude of the sound wave is large, the sound is said to be loud. Volume is directly proportional to the square of the vibration amplitude and is expressed in decibels dB. C) All of these The speed of sound is defined as the distance traveled by a point of sound waves. Loudness is a phenomenon of sound that depends on the amplitude of sound waves. Therefore, the voice of women is shrill as compared to men’s because of the difference in their frequency

6.	When the same note is played on a sitar and a flute, the sound produced can be distinguished from each other because of the difference in __________.
	A. pitch and loudness
	B. quality only
	C. pitch, loudness and quality
	D. loudness only Option “B” is correct. A musical note has same pitch and loudness across different musical instruments, only quality of sound can be different.

7.	Which one of the following is not produced by sound waves in air?
	A. Polarization
	B. Diffraction
	C. Reflection
	D. Refraction Option “A” is correct. As sound waves are longitudinal waves, they don’t exhibit Polarization phenomenon, which is exhibited by the transverse wave only.

8.	What is the maximum limit of sound intensity in decibel units beyond which a person cannot hear?
	A. 50Db
	B. 70Db
	C. 85Db
	D. 95Db Option “C” is correct.

9.	Which of the following causes maximum noise pollution?
	A. Loud Speakers
	B. Radio at low volume
	C. Low music
	D. None of these Option “A” is correct. Excessive or unwanted sounds lead to noise pollution. Major causes of noise pollution are sounds of vehicles, explosions including bursting of crackers, machines, loudspeakers etc.

10.	The sound of the whistle of an approaching train increases while it decreases for a train going away. This phenomenon is an example of-
	A. Raman Effect
	B. Joule Thomson effect
	C. Crampton effect
	D. Doppler effect Option “D” is correct. Doppler effect in physics is defined as the increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move towards (or away from) each other. Waves emitted by a source travelling towards an observer get compressed.

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