Engineering :: Environmental Engineering

@ : Home > Chemical Engineering > Environmental Engineering

11.

The per cent of total solids in most domestic sewage is approximately

A.	0.01	B.	0.1
C.	1	D.	10

12.

For protection of acquatic life in a fresh water stream sewage effluent should never lower the dissolved oxygen content lower than

A.	15 ppm	B.	10 ppm
C.	5 ppm	D.	20 ppm

13.

Ecological system or ecosystem refers to

A.	a group of individuals of any one kind of organism	B.	all of the population occupying a given area
C.	the community and non-living environment working together	D.	a portion of the earth where living objects can be found

14.

Chloramines are used in water treatment

A.	for disinfection	B.	for taste and colour control
C.	as algicides	D.	for weed control in reservoirs

15.

The most suitable equipment for removing the fine dust particle (<1micron diameter) from air below its dew point will be

A.	bag filter	B.	electrostatic precipitator
C.	cyclone separator	D.	wet scrubber

16.

The most efficient equipment for removal of sub micron dust particles from blast furnace gas is

A.	venturi scrubber	B.	gravity settling chamber
C.	electrostatic precipitator	D.	cyclone separator

17.

Man dies in an atmosphere of carbon monoxide because

A.	it combines with oxygen present in the body to form carbon dioxide	B.	it reduces the organic matter of tissues
C.	it combines with the haemoglobin of the blood making it capable of absorbing oxygen	D.	it drives up the blood

18.

The lowest layer of atmosphere is called

A.	ionosphere	B.	troposphere
C.	stratosphere	D.	exosphere

19.

Which of the following nitrogen oxides is neutral in character?

A.	N2O4	B.	N2O5
C.	N2O	D.	N2O3

20.

Arrange the following in ascending order of their occurrence in the atmosphere: (1) oxygen (2) Nitrogen (3) Carbon dioxide (4) Argon

A.	Nitrogen Oxygen Carbon dioxide Argon	B.	Argon Carbon dioxide Oxygen Nitrogen
C.	Carbon dioxide Argon Oxygen Nitrogen	D.	Nitrogen Oxygen Argon Carbon dioxide