The speed of sound through human body is around
A.344 m/s
B.688 m/s
C.1560 m/s
D.3120 m/s
Category: Environmental Engineering Mcqs
The percentage of krypton in atmospheric air is around
A.0.01 ppm
B.0.1 ppm
C.1 ppm
D.10 ppm
Which emission has generally least proportion from a diesel engine as compared to a petrol engine?
A.Oxides of nitrogen
B.Hydrocarbons
C.Carbon monoxide
D.All of the above
The flouride content in the drinking water should not exceed
A.200 mg/litre
B.150 mg/litre
C.100 mg/litre50 mg/litre
D.50 mg/litre
E.1 mg/litre
Which of the following gas can be analysed by chemiluminescence?
A.Ozone
B.Carbon dioxide
C.Nitrogen
D.All of the above
Which of the following constituent of air has the least percentage?
A.Argon
B.Carbon dioxide
C.Xenon
D.Neon
E.Helium
The science of poisons – their effects, antidotes and detection, is known as
A.Toxicology
B.Minerology
C.Petrology
D.Poisonology
E.Hermetilogy
When the trees are to be planted by the road side the minimum distance from the out edge of side width should be
A.0.5 to 1 metre
B.2 to 3 metres
C.5 to 8 metres
D.12 to 15 metres
The anitdote for the poisonous effects due to mercury, is
A.Vitamin K
B.BAL
C.Thiosulphate
D.Altropine
E.Any of the above
While comparing tungsten filament lamps with fluorescent tubes, all of the following are the advantages in favour of tungsten filament lamp EXCEPT:
A.Longer life
B.Low cost
C.More brightness
D.Simple installation
