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11) Which is best used as a sound absorbing material in partition walls ?
Correct Answer - Option
(C)
No Explanation found. Add Explanation and get +2 points.
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Learn NDA MCQs with answers [Page 2 of Department 58]
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12) A decibel is
Correct Answer - Option
(D)
No Explanation found. Add Explanation and get +2 points.
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13) Sound following a flash of lightning is called
Correct Answer - Option
(C)
Explanation :
Sound following a flash of lightning is called Thunder. Thunder or thunder clap always follows lightning because light travels faster than sound. Thunder is caused by the rush of air into the space, created by lightning as it travels from cloud to earth.
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14) Acceptable noise level for human ear
Correct Answer - Option
(C)
Explanation :
Because people can't hear all frequencies, or pitches of sound, A-weighted decibels (dBA) can be used to describe sound based on what human ears can actually hear. Sounds at or below 70 dBA are generally considered safe. Any sound at or above 85 dBA is more likely to damage your hearing over time.
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15) Decibel is a term connected with :
Correct Answer - Option
(C)
No Explanation found. Add Explanation and get +2 points.
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16) The speed of sound in air depends on
Correct Answer - Option
(B)
No Explanation found. Add Explanation and get +2 points.
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17) The unit of noise pollution (level) is :
Correct Answer - Option
(A)
No Explanation found. Add Explanation and get +2 points.
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18) The speed of sound travel fastest through
Correct Answer - Option
(B)
Explanation :
Of the three phases of matter (gas, liquid, and solid), sound waves travel the slowest through gases, faster through liquids, and fastest through solids.
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19) Compressions and Rarefactions are characteristic of
Correct Answer - Option
(A)
No Explanation found. Add Explanation and get +2 points.
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20) Least audible sound for most of the human ear is :
Correct Answer - Option
(B)
No Explanation found. Add Explanation and get +2 points.
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