A. 1
B. 5
C. 10
D. 50
Related Mcqs:
- 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 - Noise level in a quiet private business office is about _____________ decibels?
A. 25
B. 50
C. 70
D. 85 - 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 - 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 - World environment day is observed every year on the 5th of___________________?
A. June
B. December
C. July
D. September - A man exposed to excessive noise level in the working environment may suffer from____________________?
A. Hearing loss
B. Rupture of ear drum
C. Nervousness & fatigue
D. All A., B. & C. - Maximum permissible residual chlorine in treated water should be ____________ mg/litre?
A. 0.001 to 0.01
B. 0.2 to 0.3
C. 2 to 3
D. 5 to 10 - 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 - Fluorosis (a bone disease) is caused by the presence of high concentration of ____________ in atmospheric air?
A. Hydrocarbons
B. Hydrogen fluoride
C. Hydrogen sulphides
D. Nitrogen dioxide - Presence of ____________ in water stream are deleterious to aquatic life?
A. Soluble and toxic organics
B. Suspended solids
C. Heavy metals and cyanides
D. All A., B. & C.
