Category: Chemical Environmental Engineering

A. Anaerobic
B. Saprophytic
C. Aerobic
D. Parasitic

A. Explosion
B. Non biodegradable foam
C. Undesirable plant growth
D. Corrosion

A. Coagulation and flocculation of colloids
B. Oxidation of carbonaceous matter to CO2
C. Nitrification or oxidation of ammonia derived from breakdown of nitrogenous organic matter
to the nitrite and eventually to the nitrate
D. All A., B. and C.

A. Refrigerators
B. Xerox machines
C. Dermatological photo-therapy equipments
D. High voltage electrical equipments

A. 1
B. 25
C. 150
D. 650

A. The concentric atmosphere layer just above troposphere is called stratosphere, which is rich in
ozone
B. Mesosphere is characterised by very low atmospheric pressure and low temperature
C. Troposphere is a dusty zone containing water vapor and clouds
D. The radio waves used in the long distance radio communication are reflected back to earth by
stratosphere

A. Hydrocarbons
B. Hydrogen fluoride
C. Hydrogen sulphides
D. Nitrogen dioxide

A. Mufflers (silencers)
B. Acoustic absorbent
C. Lagging of noisy duct
D. None of these

A. 10
B. 200
C. 1000
D. 2000

A. Aluminium sulphate
B. Ferrous sulphate
C. Hydrated lime
D. Chloramine