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
Category: Environmental Engineering Mcqs
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
The permissible level of HCN in drinking water is
A.Less than 0.01 mg/litre
B.Around 1 mg/litre
C.Around 5 mg/litre
D.Between 10 to 20 mg/litre
E.More than 50 mg/litre
The volume fraction of ozone in atmospheric air is nearly
A.0.02 ppm
B.0.2 ppm
C.2 ppm
D.20 ppm
The emission of carbon monoxide in automobile exhaust will be low when the vehicle is
A.Idling
B.Cruising at low speed
C.Cruising at high speed
D.Accelerating
E.Decelerating
