A. Inversely proportional to viscosity of gas

B. Proportional to the viscosity & density of the gas

C. Proportional to the pressure of the gas

A. Fumes

C. Mists

D. Smoke

A. Vibration damping

B. Tree plantation

C. Use of silencers

A. Natural aeration of water stream

B. Photosynthetic action of algae

D. Neither A. nor B.

A. 50

C. 2000

D. 1000

A. Chloride

B. Sulphate

C. Carbonate

A. logical decomposition of the organic matter present in water stream present as food for the

B. BOD is expressed in mg/litre (typically, BOD=2.5 mg/litre for potable water)

C. BOD is a measure of the amount of oxygen which will be demanded & used in 5 days by the

D. ing organism

E. Biological oxygen demand (BOD) is a characteristic and not a constituent of water

A. Iron and manganese

B. Foul smell and taste

D. Permanent hardness

B. t emitted by a four stroke engine

C. t emitted from a four stroke engine</strong>

D. Mercury as a pollutant can enter the blood stream & the digestive system/ lungs and is

E. ponsible for causing Minamata disease

F. Amount of unburnt hydrocarbons emitted by two stroke petrol engine is more as compared to

A. 12

B. 1

C. 8

A. Deforestation

C. Forest fire

D. None of these

A. Soluble and toxic organics

B. Suspended solids

C. Heavy metals and cyanides

A. 230 V AC

B. 30 to 70 kV AC

D. 230 V DC

A. Benzopyrene which causes cancer is present in traces in tobacco, charcoal & petrol driven

B. omobile exhaust

C. NO2 is capable of penetrating the troposphere and can absorb both ultraviolet & visible light

D. Hydrocarbon pollutants are produced by sweet gum, oak & natural rubber trees

F. dised to SO2</strong>

B. Decomposition of plants containing chlorophyll is a natural source of carbon monoxide in

C. osphere

D. Catalytic converter is fitted in automobiles to reduce carbon monoxide concentration in

E. aust emissions

F. Inhalation of pollutant carbon monoxide results in death by asphyxiation

A. Increase the dew point of

B. Catalytically convert SO2 to SO3 in

C. None of these

A. Benzopyrene

C. Photochemical smog

D. Polyacrylonitrile

A. 0.1

B. 1

C. 25

A. Iron & steel plant

B. Petroleum refinery

D. Municipal sewage treatment

A. Separation

B. Aerobic decomposition

D. None of these

B. Dissolved solids

C. Floating solids

D. Dissolved gases

A. 20

B. 200

C. 100

B. 0.5

C. 1097

D. 357

B. Respiratory ailments (e.g. bronchitis)

C. Silicosis

D. Blurred vision

A. Environmental pollution by NOx emission is much higher by four stroke petrol engines as

B. iation to come in but does not allow the short wavelength infra red radiation to escape out

D. Temperature in stratosphere rises with increasing altitude

E. mical oxygen demand (C.O.D.) value

F. pared to the two stroke engines

A. 2-Jan

C. 2000-3000

D. 10-May

A. Reduced strength of textiles

C. Fading of dyes on textiles

D. Corrosion, tarnishing & soiling of metals

B. Noise from vibrating chutes can be reduced by lining the metallic chute with rubber

C. Noise of conveyor belt system is reduced by using urethane coated cloth conveyor belts and

D. Noise from ball mills can be dealt with by fibre glass lined enclosures

E. ber/plastic covered metallic rollers

A. Nervous system disorder

C. Blood poisoning

D. Anaemia

A. 145

C. 125

D. 85

A. Destroys/removes pathogen from the sewage

C. Destroys/removes pathogen much more effectively if the sewage is chlorinated

D. Is not very effective for non-biodegradable substances (e.g. ABS) containing effluents

A. Respiratory disease (e.g. asthma)

B. Damage to building materials like marble

C. Retardation in crop growth