(Objective/Short Type)
• What are SOx and NOx.?
Ans; The two oxides of sulpher are sulpher dioxide (SO 2 ) and sulpher trioxide (SO 3 ), which are collectively known as SOx , where x=2 or x=3.
There are several oxide of nitrogen (such as N 2 O, NO,NO 2 ,N2O 2 and N 2 O 5 ), Which are collectively known as NOx.
• List four hea vy me tals that pollute water.
Ans: heavy metals like Hg (murcury), Cd (cadmium), Pb (lead), As , Se and Sb.
• What is a septic tank ?
Ans : An important method used to process the domestic sewage is the septic tank, which is an underground sewage container madeof concrete.
• What are the c-wastes ?
Ans : It has been estimated that more than one billion PCs (personal computers) have already been sold globally and there has also been a spurt in the sales of other electronic items like refrigerators, air conditioners, cellular phones and personal stereos. As a result, the quantum of electronic As a result, the quantum of electronic waste (discarded electronic items or “ e-waste ”)
• What is ozone?
Ans : The ozone (O 3 ) is a variant of oxygen (O 2 ), which contains three oxygen atoms instead of the usual two, as in the case of the oxygen molcule.
• The common methods for the disposal of solid wastes are:
(A) Sanitary land-fill (b) Incineration
(c) Composting (d) None of these.
• India is a:
(a) Developed country among developing nations
(b) Developing country among developed nations
(c) Both
(d) Only (a).
• Thermal power plants use:
(a) Coal (b) Oil
(c) Uranium (d) Strontium
• Purification of gaseous pollutants maybe achieved by;
(a) Catalyric conversion (b) Adsorption
(c) Absorption (d) All of these.
• Complex soil pollutants include:
(a) Fly-ash (b) Plastics
(c) Both (d) Neither.
• Write true or false:
Qua : Herbicides, fungicides and insecticides belong to the family of pesticides.
Ans : True
• Write true or false—
Qua : Detergents are inorganic chemicals.
Ans : Detergents are organic chemicals.
• Write true or false:
Qua : Radioactive isotopes have a Very long half-life.
Ans : Radioactive isotopes have a short half-life.
• Write true or false:
Qua : Cadmium poisoning may lead to formation of kidney stones
Ans: Cadmium poisoning may lead to toxic effect
• Write true or false:
Qua : Increase in dissolved oxygen adversely affects the aquatic plants and animals.
Ans : Reduce in dissolved oxygen adversely affects the aquatic plants and animals.
8.23 Write true or false:
Qua : Lime can not be used to precipitate phosphorous.
Ans : Lime can be used to precipitate phosphorous.
• Write true or false:
Qua : The anaerobic treatment process is not effective for effluents containing high concentration of orgaiuc matters.
Ans: The anaerobic treatment process has been effective for effluents containing high concentration of orgaiuc matters.
• Fill up the blank:
Prolonged exposure to noise may cause hearing loss .
8.25 Fill up the blank:
Gobar gas is a mixture of methane (60% ) and carbon dioxide (35%)
8.27 Fill up the blank:
Heat is an example of Thermal pollutant
8.28 Match thefollowing:
(A) Noise pollution (a) Carcinogin
(B) Dioxin (b) Detritus tank
(C) Fly-ash (c) Auditory effect
(D) Sewage (d) Power plant
A-c,B-a,C-d,D-b
• Match the following:
(A) Brain damage (a) DDT
(B) Deforestation (b) Population
(C) Third World countries (c) Soil erosion
(D) White lung lung (d) Textiles
A-c,B-a,C-d,D-b
Write the odd ones :
(a) Greenhouse effect (b) Global warming
• Suspended particulate matters (d) Acid rain.
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