A. Fatty

B. Dissolved

D. Organic

A. Oxidation followed by settling & filtration

C. Lime soda process or manganese zeolite process

D. Ion exchange process

B. Anaerobic

C. Parasitic

D. Saprophytic

A. Scale formation

B. Corrosion

D. Water-borne disease

A. Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended

B. Are large shallow artificial lakes also known as clarification lakes, maturation ponds or

D. dation ponds

E. Use micro-organisms/bacteria in presence of dissolved oxygen

F. id < 1 mg/litre and BOD = 3.8 mg/litre

A. Preheating of feed water

B. Eliminating H2S in feed water

D. Keeping the pH value of feed water just below 7

A. Indeterminate

B. None of these

C. Negative

A. Path control of noise

B. Protection of operating personnel

C. Suppression of noise at the source itself

B. 9 to 10

C. 15 to 20

D. 1 to 2

A. 400

B. 4000

D. 100

A. CO2, H2S & NO2

B. SO3, NO2 & CO2

C. CO2, NO & SO3

A. 13.4

B. 1.8

D. 6.2

A. Chlorination only

B. Chemical coagulation

D. Simple filtration

B. Below triple point

C. Boiling point

D. Always

A. Hydrated lime

B. Ferrous sulphate

D. Aluminium sulphate

A. May increase or decrease; depends on the chemical characteristics of polluted water

B. Increases

D. Remain constant

A. 2000

C. 1000

D. 10

A. Shrinkage of filtering media

B. Expansion of filtering media

D. Air binding

A. CO2

C. CO

D. H2

B. None of these

C. Silica

D. Coal

A. Gravitational force on

B. Diffusion of

D. Electrostatic force on

B. Trickling filters

C. Aerated lagoons

D. Biological oxygen pond

A. Nitrogen dioxide

C. Dust particles

D. Sulphur dioxide

A. Biological oxygen treatment

B. Coagulation and filtration

D. None of these

A. Low T, low P

B. Low T, high P

D. High T, high P

B. Smoke

C. Grit

D. Aggregates

A. Metallic powder

B. Woolen clothes

C. None of these

A. Rhombus

B. Trapezoid

C. Circle

A. 10 to 15

B. 15 to 20

C. 0.1 to 1

B. None of these

C. Catalytically convert SO2 to SO3 in

D. Increase the dew point of

A. Reflects and absorbs the longer wavelength (infra-red) radiations

B. Prevents solar heat being radiated out completely, resulting in heat trap i.e., global warming

D. Allows visible solar radiation (ultraviolet) of short wave-length to pass through

A. 105

C. 35

D. 95

A. Dust & mists

C. Photochemical smog & soot

D. Smoke & fumes

A. Evaporation & chemical precipitation

C. Fixing into a solid mass with cement and sinking deep in the sea

D. Biological methods & adsorption in ion exchange materials

B. 1 to 1.5

C. 4 to 5

D. 13 to 14

A. NO2

B. NH3

C. SO2 & SO3

A. Temporary hardness

B. None of these

C. Reduction in its dissolved oxygen content

A. Enthalpy does not remain constant

B. Temperature remains constant

D. Entire apparatus is exposed to surroundings

A. Highly

C. Extremely

D. Very extremely

A. Nitrification or oxidation of ammonia derived from breakdown of nitrogenous organic matter

B. the nitrite and eventually to the nitrate

D. Oxidation of carbonaceous matter to CO2

E. Coagulation and flocculation of colloids

A. Natural aeration of water stream

B. Photosynthetic action of algae

D. Neither A. nor B.

A. 357

B. 0.5

D. 1097

A. Photochemical oxidation of organic matter

B. Industrial chimney exhaust

C. Forest fire

A. characterised by a steady decrease in temperature is called stratosphere</strong>

B. Troposphere is a turbulent dusty zone containing much of water vapor and clouds

C. The earths atmosphere is an envelope of gases extending upto a height of about 200 kms

D. Stratosphere is rich in ozone and is located just above the troposphere

A. Sodium aluminate

C. Ferric chloride

D. Lime

A. Tooth decay

B. Gastroenteritis

C. Asphyxiation

A. Turbidity

C. Dissolved oxygen

D. Suspended silica

A. Hydrocarbons

B. CO2

D. NO

A. Asphyxiation

B. Shortness of breath

C. Tuberculosis

A. Black

B. Red

D. Dark brown