## Subject: Environmental Pollution Control ##

Nitrogen oxides $($NOx$)$ is not produced in the

industry.

a$.$ any of these

b$.$ detergent

c$.$ nitric acid making

d$.$ nitrogenous fertiliser

What is meant by the effective stack height?

a$.$ Difference of stack height and plume rise

b$.$ Height of the plume

c$.$ Synonymous with the stack height

d$.$ Sum of stack height and plume rise

Most of the atmospheric air pollutants are present in large quantity in

a$.$ stratosphere

b$.$ trophosphere

c$.$ thermosphere

d$.$ mesosphere