Audio Engineering MCQ Questions and Answers – Sensitivity of Human Ear for Sound – 1

This set of Audio Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Sensitivity of Human Ear for Sound – 1”.

1. A loud sound is about how many times greater than that of the weakest sounds?
a) Penta
b) Hexa
c) Tera

Explanation: A loud sound is about a million million OR Tera (1012) times greater than that of the weakest sounds. The frequency range for hearing varies greatly from person to person. Vibrations of the ear can be as small as 10-8 mm or smaller than a hydrogen atom.

2. What is the complete audible range for a human ear?
a) 20 to 25,000 HZ
b) 30 to 30,000 HZ
c) 20 to 20,000 HZ
d) 60 to 60,000 HZ

Explanation: Humans can detect sounds in a frequency range from about 20 Hz to 20,000 Hz. (Human infants (children) can actually hear frequencies slightly higher than 20,000 Hz, but lose some high-frequency sensitivity as they mature).

3. How many Hertz do healthy young people usually hear?
a) 6-7 KHz
b) 1-2 KHz
c) 13-14 KHz
d) 17-18 KHz

Explanation: A healthy young person usually can only hear upto 17-18 KHz. Our ability to hear the high frequencies continuously drops with age. We hear low frequencies not as good as high frequencies, up to around 10 KHz where again our sensitivity drops off.

4. Above how many KHz men and women can’t hear by the age of 55?
a) 5, 12
b) 12, 5
c) 9, 14
d) 14, 9

Explanation: By the age of 55 men can’t hear above 5KHz and women above 12 KHz. Women tend to have better hearing at high frequencies, especially after 25 years of age or so. The ears sensitivity varies extremely with frequency.

5. What is most sensitive to frequencies in the range of 2,000-5,000 Hz?
a) Cochlea
b) Pinna
c) Human ear
d) Auditory nerve

Explanation: The human ear is an incredible sound sensing device. The human ear is most sensitive to frequency in the range of 2,000-5,000 Hz, and therefore the normal telephone channel is provided a bandwidth of 3400 Hz.

6. Frequencies above 30 Hz are hard to distinguish for human ear.
a) True
b) False

Explanation: The ear’s sensitivity varies extremely with frequency. Frequencies below 30 Hz are hard to distinguish for human ear. Lower frequencies produce more of sense of “feeling” than a sense of sound. Hence, we are not able to hear frequencies below 30 Hz.

7. Which scale is used to perceive the loudness of sounds?
a) Decibel
b) Celsius
c) Kelvin
d) Rankine

Explanation: The decibel scale is used because it closely corresponds to how we perceive the loudness of sounds. The human ear is really quite an amazing detector of sound. A loud sound is about Tera (1012) times greater than that of the weakest sounds.

8. What does the outer ear act like?
a) Tunnel
b) Funnel
c) Canal
d) Waves

Explanation: The ear is split into 3 sections, the outer, the middle and the inner ear. The outer ear act like a funnel, collecting the sound and transferring it inside the head down a passage of about 3 cm long, ending at the ear drum.

9. Which of the following separates the outer ear from the middle ear?
a) Ear canal
b) Pinna
c) Auditory nerve
d) Eardrum

Explanation: The three sections of human ear are the outer ear, the middle ear and the inner ear. The ear drum separates the outer ear from the middle ear, and much like the skin on a drum it is a thin membrane that vibrates in response to a sound wave.

10. Which tube connects the middle ear with the mouth?
a) Eardrum
b) Eustachian
c) Ear canal
d) Fallopian

Explanation: Eustachian tube connects the middle ear with the mouth to ensure that the inside of the ear drum is maintained at atmospheric pressure. This is necessary for the drums to be able to respond to the small variations in pressure from atmospheric pressure that make up the sound wave.

Sanfoundry Global Education & Learning Series – Audio Engineering.

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