A. Stratosphere
B. Troposphere
C. Ionosphere
D. None of these
A. CO2
B. SO2
C. Hydrocarbons
D. CFC (chloro fluoro carbon)
A. Characterisation of solid wastes
B. Organic concentration in gaseous effluents
C. Characterisation of liquid effluents
D. Characterisation of boiler feed water
A. Acetylene
B. Petrol vapor
C. Hydrogen
D. Carbon monoxide
A. Grinding
B. Machining
C. Cutting
D. Polishing
A. Insufficient supply of combustion air and insufficient time for combustion
B. Poor quality of fuel and improper mixing of fuel & combustion air
C. Poor design & overloading of furnace
D. All A., B. and C.
A. Mufflers (silencers)
B. Acoustic absorbent
C. Lagging of noisy duct
D. None of these