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McqMate
Chapters
1. |
Which part of human ear converts sound vibrations into electrical signals |
A. | Hammer |
B. | Stirrup |
C. | Tympanic membrane |
D. | Cochlea |
Answer» D. Cochlea |
2. |
Sound is measured by units that are called |
A. | Hertz (Hz) |
B. | Decibels (dB) |
C. | Meters (m) |
D. | Pascal (Pa) |
Answer» B. Decibels (dB) |
3. |
'Eardrum' bursts at |
A. | 40 dB |
B. | 80 dB |
C. | 160 dB |
D. | 320 dB |
Answer» C. 160 dB |
4. |
The loudness of sound varies directly with the vibrating body's |
A. | Intensity |
B. | Amplitude |
C. | Pitch |
D. | Quality |
Answer» B. Amplitude |
5. |
The scale to measure the intensity level of sound is called |
A. | Vector scale |
B. | Measuring ruler |
C. | Bel scale |
D. | decibel scale |
Answer» D. decibel scale |
6. |
Pitch of the sound depends upon |
A. | Frequency |
B. | Distance of sound |
C. | Amplitude |
D. | Temperature |
Answer» A. Frequency |
7. |
Noise is |
A. | An unwanted noise |
B. | An irritant |
C. | A source of stress |
D. | all of the above |
Answer» D. all of the above |
8. |
Following scale is used for loudness of sound or noise |
A. | Linear scale |
B. | Logarithmic scale |
C. | Exponential scale |
D. | None of the above |
Answer» B. Logarithmic scale |
9. |
Sound Intensity is given by. |
A. | I=w/s |
B. | I=s/w |
C. | w=I/s |
D. | s=w/I |
Answer» A. I=w/s |
10. |
Unit for Reference sound intensity is_________. |
A. | W/m2 |
B. | W/mm3 |
C. | W/cm3 |
D. | None of the above |
Answer» A. W/m2 |
11. |
Sound power of a machine whose specified sound power level is 125 dB |
A. | 3.16 w |
B. | 4.2w |
C. | 5w |
D. | 31.6w |
Answer» A. 3.16 w |
12. |
The process of maintaining appropriate noise level without considering economic factors is called as _____ |
A. | noise control |
B. | noise reduction |
C. | both a. and b. |
D. | none of the above |
Answer» B. noise reduction |
13. |
Basic elements of noise control are |
A. | Source ,Path ,Receiver of noise |
B. | Amplitude and Frequency |
C. | Time period |
D. | A and B both |
Answer» A. Source ,Path ,Receiver of noise |
14. |
All sound is noise. |
A. | TRUE |
B. | False |
C. | none |
D. | none |
Answer» B. False |
15. |
Main sources of noise pollution are |
A. | Transportation equipment only |
B. | Heavy machinery only |
C. | Musical instruments |
D. | Transportation equipment and heavy machinery |
Answer» D. Transportation equipment and heavy machinery |
16. |
The sound can travel in air when: |
A. | Particles of medium travel from one place to another |
B. | There is no moisture in the atmosphere |
C. | Disturbance travel from one place to another |
D. | Both particles as well as disturbance travel from one place to another |
Answer» C. Disturbance travel from one place to another |
17. |
White noise is random noise that has a audible frequency rangefrom |
A. | 320 to 100 KHz |
B. | 20 to 20KHtz |
C. | 120 to 20KHtz |
D. | 220 to 20KHtz |
Answer» B. 20 to 20KHtz |
18. |
Which among the following has a constant power spectral density over a wide frequency range? |
A. | White noise |
B. | Black noise |
C. | Pink noise |
D. | Blue noise |
Answer» A. White noise |
19. |
Which is correct option for ear protection equipment? |
A. | Headphone |
B. | Use of cotton in ears |
C. | Ear defeders ,Ear plugs |
D. | All the above |
Answer» C. Ear defeders ,Ear plugs |
20. |
The technique or method to absorb undesirable sounds by soft and porous |
A. | Acoustic protection |
B. | Unacoustic protection |
C. | Audible protection |
D. | Decibel protection |
Answer» A. Acoustic protection |
21. |
When sound interacts with materials and boundaries, it displays all the |
A. | Heat |
B. | Waves |
C. | Light |
D. | Electricity |
Answer» B. Waves |
22. |
Soft materials absorb a large amount of |
A. | Heat energy |
B. | Light energy |
C. | Electromagnetic waves |
D. | Sound energy |
Answer» D. Sound energy |
23. |
Reflection coefficient (Γ) is the rario of intensity of sound ______________. |
A. | Reflected / Incident. |
B. | Incident / Reflected. |
C. | Absorbed / Reflected. |
D. | None of the above. |
Answer» A. Reflected / Incident. |
24. |
Absorption coefficient (α) is the rario of intensity of sound ______________. |
A. | Absorbed / Incident. |
B. | Incident / Reflected. |
C. | Absorbed / Incident. |
D. | None of the above. |
Answer» C. Absorbed / Incident. |
25. |
Which best describe the sound wave? |
A. | It may be longitudinal |
B. | It is always transverse |
C. | It is always longitudinal |
D. | All of the above |
Answer» C. It is always longitudinal |
26. |
Which of the following can not travel through a vacuum? |
A. | Electromagnetic wave |
B. | Radio wave |
C. | Sound wave |
D. | Light wave |
Answer» C. Sound wave |
27. |
Through which medium does sound travel fastest? |
A. | Air |
B. | Steel |
C. | Water |
D. | Mercury |
Answer» B. Steel |
28. |
Sound wave has two main characteristics which are |
A. | Pitch and loudness |
B. | Tone and loudness |
C. | Highness and loudness |
D. | Rarefaction and compression |
Answer» A. Pitch and loudness |
29. |
When waves bend away from straight lines of travel, it is called |
A. | Reflection |
B. | Diffraction |
C. | Rarefaction |
D. | Refraction |
Answer» D. Refraction |
30. |
_________ is the sound power measured over the area upon which is received. |
A. | Sound pressure |
B. | Sound energy |
C. | Sound intensity |
D. | Sound pressure level |
Answer» C. Sound intensity |
31. |
It is an audio transducer that converts acoustic pressure in air into its equivalent electrical impulses |
A. | Loudspeaker |
B. | Amplifier |
C. | Baffle |
D. | Microphone |
Answer» D. Microphone |
32. |
_________ is a pressure type microphone with permanent coil as a transducing element. |
A. | Dynamic |
B. | Condenser |
C. | Magnetic |
D. | Carbon |
Answer» A. Dynamic |
33. |
A capacitor stores energy in the form of an electrostatic field is a ______. |
A. | Dynamic Microphone |
B. | Condenser Microphone |
C. | Magnetic Microphone |
D. | Carbon Microphone |
Answer» B. Condenser Microphone |
34. |
A microphone that uses the piezoelectric effect |
A. | Dynamic |
B. | Condenser |
C. | Crystal |
D. | Carbon |
Answer» C. Crystal |
35. |
It describes the output of a microphone over a range of frequencies. |
A. | Directivity |
B. | Sensitivity |
C. | Frequency response |
D. | All of the above |
Answer» C. Frequency response |
36. |
The most important terms that are used to describe the sound field around a sound emitting object |
A. | Far , Near Field |
B. | Free ,Diffuse Field |
C. | A and B both |
D. | None of the above |
Answer» C. A and B both |
37. |
The sound waves behave in a much more complex fashion, and there is no fixed relationship between ________________. |
A. | Sound pressure |
B. | pressure and distance |
C. | Sound energy |
D. | Sound intensity |
Answer» B. pressure and distance |
38. |
The sound far field is beginning at a distance of ____________ . |
A. | pressure and distance |
B. | Sound energy |
C. | Sound pressure |
D. | 2 wavelengths away from the sound source |
Answer» D. 2 wavelengths away from the sound source |
39. |
Measurement of noise can be made in following environment ____________ |
A. | Anechoic Chamber |
B. | Semi - anechoic Chamber |
C. | Reverberant Chamber |
D. | All the above |
Answer» D. All the above |
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