A. Alum (aluminium sulphate)
B. Lime
C. Ferric chloride
D. Sodium aluminate
A. 85
B. 105
C. 125
D. 145
A. 5
B. 50
C. 500
D. 5000
A. Chemical coagulation
B. Floatation & skimming
C. Centrifugation
D. Ultra filtration
A. Automobile exhaust
B. Flue gas of coal based power plant
C. Exhaust of nitric acid plant
D. Exhaust of sulphuric acid plant
A. Tanneries
B. Glass & ceramic
C. Beverages
D. Any of these
A. ‘Green house’ (made of glass) allows visible sunlight (i.e., short wavelength solar radiation
like ultra-violet rays) to pass through the glass and heat up the soil thereby warming up plants
inside it
B. The emitted longer wavelength radiation (e.g., infrared) is partly reflected and partly absorbed
by the glass of the green house
C. ‘Green house effect’ in earth’s atmosphere is due to increasing CO2 level in atmosphere, where
CO2 acts like the glass of ‘green house’ thereby warming up the earth’s surface
D. ‘Green house’ is colder than the outside atmosphere