A. 60
B. 90
C. 105
D. 120
A. 0.001 to 0.01
B. 0.2 to 0.3
C. 2 to 3
D. 5 to 10
Maximum permissible residual chlorine in treated water should be ____________ mg/litre? Read More »
Chemical Environmental Engineering A. Asphyxiation (suffocation)
B. Shortness of breath
C. Tuberculosis
D. All A., B. and C.
A. 2 to 4
B. 8 to 12
C. 16 to 20
D. 24 to 32
In a sedimentation tank, the detention period for water ranges from _____________ hours? Read More »
Chemical Environmental Engineering A. Fats
B. Carbohydrates
C. Salts of metals
D. Protein
Inorganic impurities causing water pollution is ____________________? Read More »
Chemical Environmental Engineering A. Air
B. Water
C. Noise
D. Radioactive
Ringelmann chart is used for the evaluation of _____________ pollution? Read More »
Chemical Environmental Engineering A. Refrigerators
B. Xerox machines
C. Dermatological photo-therapy equipments
D. High voltage electrical equipments
Which of the following is not a source of ozone emission in the atmosphere? Read More »
Chemical Environmental Engineering A. By reaction of hydrocarbon & nitric oxide in presence of sunlight
B. Appears only on sunny days
C. Is harmful for crops and trees also besides causing eye irritation & asthma
D. All A., B. & C.
Photochemical smog is formed from automobile exhaust ________________? Read More »
Chemical Environmental Engineering A. Stratosphere
B. Troposphere
C. Ionosphere
D. None of these
The lowest layer of atmosphere is known as the_____________________? Read More »
Chemical Environmental Engineering A. Chlorine
B. Alkalis
C. Benzene hexachloride
D. Alkyl benzene sulphonate (ABS)
