McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
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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