Fundamentals of Sound - Mechanical Engineering (MCQ) questions and answers

1)   Which part of the human ear is divided by the basilar membrane?

a. Ear drum
b. Helicontrema
c. Cochlea
d. Eustachian tube
Answer  Explanation 

ANSWER: Cochlea

Explanation:
No explanation is available for this question!
2)   Elastomeric foam used as a sound absorber is made of ___________

a. Non-porous material
b. Porous material
c. Perforated material
d. Resonator
Answer  Explanation 

ANSWER: Porous material

Explanation:
No explanation is available for this question!
3)   The resonant frequency of a mass-spring system depends upon ________

a. stiffness
b. surface density
c. depth of air space
d. all of the above
Answer  Explanation 

ANSWER: all of the above

Explanation:
No explanation is available for this question!
4)   What happens when sound waves impinge on fiber boards?

a. Sound energy is converted into vibrational energy
b. Sound energy is converted into heat energy
c. Sound energy is converted into mechanical energy
d. All of the above
Answer  Explanation 

ANSWER: Sound energy is converted into heat energy

Explanation:
No explanation is available for this question!
5)   When a person enters a far field from a near field, the sound pressure level drops off at the rate of _______

a. 2 dB per 1/4th distance from point source
b. 2 dB per doubling the distance from point source
c. 4 dB per half distance from point source
d. 6 dB per doubling the distance from point source
Answer  Explanation 

ANSWER: 6 dB per doubling the distance from point source

Explanation:
No explanation is available for this question!
6)   What will be the sound power level, if a machine generates 20 W power?

a. 124 dB
b. 133 dB
c. 150 dB
d. 200 dB
Answer  Explanation 

ANSWER: 133 dB

Explanation:
No explanation is available for this question!
7)   Which of the following is the reference pressure often referred to as threshold of hearing at 1000 Hz?

a. 5 x 10-5 N/m2
b. 3 x 10-5 N/m2
c. 2 x 10-5 N/m2
d. None of the above
Answer  Explanation 

ANSWER: 2 x 10-5 N/m2

Explanation:
No explanation is available for this question!
8)   What is the range of audible sound pressure to which a human ear can be subjected to?

a. 10-5 N/m2 to 10-12 N/m2
b. 10-12 W/m2 to 10 W/m2
c. 2 x 10-5 N/m2 to 200 N/m2
d. 2 x 10-5 N/m2 to 300 N/m2
Answer  Explanation 

ANSWER: 2 x 10-5 N/m2 to 200 N/m2

Explanation:
No explanation is available for this question!
9)   Sound wave has a frequency of 8 kHz at 22o C. Determine its wavelength.

a. 0.043 m
b. 0.039 m
c. 0.125 m
d. 0.0125 m
Answer  Explanation 

ANSWER: 0.043 m

Explanation:
No explanation is available for this question!
10)   Determine velocity of sound in air at 50o.

(For air, γ = 1.4)

a. 1002.5 m/s
b. 360.45 m/s
c. 350 m/s
d. None of the above
Answer  Explanation 

ANSWER: 360.45 m/s

Explanation:
No explanation is available for this question!

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