A. 5
B. 100
C. 250
D. 500
Dissolved oxygen content in river water is around _____________ ppm? Read More »
Chemical Environmental Engineering A. 50
B. 1000
C. 2000
D. 5000
A. Organic
B. Fatty
C. Inorganic
D. Dissolved
A. Respiratory ailments (e.g. bronchitis)
B. Skin diseases (e.g. dermatitis)
C. Silicosis
D. Blurred vision
A. 30 to 70 kV DC
B. 30 to 70 kV AC
C. 230 V AC
D. 230 V DC
A. 10
B. 45
C. 90
D. 115
Noise level during normal conversation among men is about ______________ decibels? Read More »
Chemical Environmental Engineering A. Hydrogen sulphide
B. Mercury
C. Cadmium
D. Asbestos
A. Forest fire
B. Deforestation
C. Volcanic eruption
D. None of these
Which of the following acts as a natural source of air pollution ? Read More »
Chemical Environmental Engineering A. Fading of dyes on textiles
B. Corrosion, tarnishing & soiling of metals
C. Reduced strength of textiles
D. All A., B. and C.
A. Turbidity
B. Caustic embrittlement
C. Suspended silica
D. Dissolved oxygen
Tri-sodium phosphate is used in boiler water treatment to reduce____________________? Read More »
Chemical Environmental Engineering