This set of Audio Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Sensitivity of Human Ear for Sound – 2”.
1. How many bones does middle ear have?
a) 1
b) 2
c) 3
d) 4
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Explanation: The middle ear has three small bones, called the hammer, anvil, and stirrup because of their shapes. They transfer the sound wave from the ear drum to the inner ear. It is similar to a hydraulic lift; the pressure is transferred from a relatively larger area to a smaller area.
2. What does the bones in the ear act like?
a) Audio amplifier
b) Video amplifier
c) Radio amplifier
d) Ultrasonic amplifier
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Explanation: According to Pascal’s principle, the pressure is constant. The force is smaller at the inner ear, but the work done at each end is equal, so the inner ear experiences a vibration with much larger amplitude than that at the eardrum. Thus, bones act as an audio amplifier.
3. The eardrum and the window to the outer ear have different acoustic properties.
a) True
b) False
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Explanation: The eardrum and the window to the inner ear have different acoustic properties. If they were directly connected together some energy would be reflected back. The three bones in the middle ear are designed to transfer sound energy from the eardrum to the inner ear without any energy lost to reflections.
4. Which of the following is the fluid-filled tube present in the inner ear?
a) Cochlea
b) Pinna
c) Auditory nerve
d) Fallopian
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Explanation: The inner ear contains a fluid-filled tube called the cochlea. The cochlea is coiled like a snail, it is about 3 mm in diameter, and is divided along its length by the basilar membrane. It also contains a set of hair cells that convert the sound wave into electrical pulses.
5. The human ear is most sensitive to sound of 3000 Hz.
a) True
b) False
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Explanation: The range of human hearing is quite large, both in terms of sound intensity and sound frequency. Humans can hear sounds between about 20 Hz and 20,000 Hz. The human ear is most sensitive to sound of about 3000 Hz.
6. Which age group of people can hear the frequencies above 20,000 Hz?
a) 70-80 years
b) 65-75 years
c) Young
d) 55-65 years
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Explanation: Frequencies above 20,000 Hz can only sometimes be sensed by young people. These are called ultrasonic sounds. Hearing loss is the first effect by high frequencies due to age and prolonged exposure to very loud noises.
7. What is the full form of Hi – Fi?
a) Highest fidelity
b) High fidelity
c) Huge fidelity
d) High frequency
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Explanation: The term Hi-Fi is a short form for High Fidelity. In the same way, Lo-Fi is a short form for Low Fidelity. To refer to high-quality reproduction of sound Hi-Fi is used by home enthusiasts and listeners.
8. What is the required frequency range for Hi-Fi programs?
a) 80 Hz to 5 KHz
b) 40 Hz to 15 KHz
c) 60 Hz to 55 KHz
d) 8 Hz to 66 KHz
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Explanation: There are two types of programs – Hi-Fi and Lo-Fi (Low Fidelity). The term Hi-Fi stands for High Fidelity. For high fidelity (Hi-Fi) entertainment program, the frequency range should be at least 40 Hz to 15 KHz.
9. What is the required frequency range for normal entertainment programs?
a) 80 Hz to 5 KHz
b) 40 Hz to 15 KHz
c) 60 Hz to 55 KHz
d) 8 Hz to 66 KHz
View Answer
Explanation: It has been experimented that low frequencies contain most of the energy, while high frequencies gives better articulation. The frequency range required for normal entertainment programs is 80 Hz to 5 KHz.
Sanfoundry Global Education & Learning Series – Audio Engineering.
To practice all areas of Audio Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.
