A. 25
B. 50
C. 80
D. 120
Related Mcqs:
- Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about _______________ decibels?
A. 105
B. 135
C. 160
D. 185 - Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about ______________ decibels?
A. 75
B. 95
C. 120
D. 140 - Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about ______________ decibels?
A. 90
B. 120
C. 150
D. 180 - The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about ____________ decibels?
A. 60
B. 90
C. 105
D. 120 - Noise level in a quiet private business office is about _____________ decibels?
A. 25
B. 50
C. 70
D. 85 - Noise level heard at a distance of about 100 metres from a jet engine with after burner is about _____________ decibels?
A. 120
B. 140
C. 170
D. 200 - Noise level inside a jet airliner in normal flight is about ______________ decibels?
A. 80
B. 100
C. 125
D. 150 - Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about ____________ decibels?
A. 3
B. 30
C. 7
D. 70 - Noise level during normal conversation among men is about ______________ decibels?
A. 10
B. 45
C. 90
D. 115 - Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about ______________ decibels?
A. 20
B. 60
C. 90
D. 120
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