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
Category: Environmental Engineering Mcqs
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
The speed of sound through water is nearly
A.344 m/s
B.750 m/s
C.1500 m/s
D.3000 m/s
Bit is the unit of
A.Amount of rain recorded
B.Memory of computer
C.Quantity of electricity
D.Intensity of an earthquake
E.None of these
A fuel of octane rating 85 matches the antiknock qualities of a mixture consisting of
A.85% petrol + 15% diesel
B.15% petrol + 85% diesel
C.85% benzene + 15% methyl chloride
D.85% octane + 15% heptane
Which of the following is a cold cathode lamp?
A.Sodium vapour lamp
B.High pressure mercury vapour lamp
C.Low pressure mercury vapour lamp
D.Neon lamp
Term REM is used for
A.solar radiation
B.flame photography
C.radiation exposure
D.none of the above
Which of the following is unlikely to be the pollutant from a sulphuric acid plant?
A.Sulphur dioxide
B.Sulphur trioxide
C.Acid mist
D.Hydrogen sulphide
E.All of the above
In the jet propulsion, efficiency of the propulstion depends upon
A.The speed of the vehicle
B.Height at which the vehicle is travelling
C.Density of the medium in which the vehicle is travelling
D.All of the above
