Question 5 :
Mixture of which one of the following pairs of gases is the cause of occurrence of most of the explosions in mines?
Question 9 :
Which building material is least likely to be rapidly eroded by acid rain?<br>
Question 11 :
Assertion: Ney York City may submerge due to global warming.
Reason: Due to global warming, glaciers are melting and due to this sea-level will be certainly increasing which may cause flooding of cities situated at the bank of the sea. New York is one of them.
Question 12 :
The progressive warming up of the earth's surface is mainly due to :<br/>
Question 14 :
If heat radiated from Earth's surface is retained, outcome will be:<br/>
Question 17 :
The excess of fertilizers not consumed by crops are washed away from land by rain and pollute _____.<br>
Question 21 :
Which of the following is not a way to conserve water?<br>
Question 24 :
Oil refineries, paper factories, textile and sugar mills, chemical factories are responsible for water pollution.These industries discharge harmful chemicals into revers and streams, and pollute water. The chemicals released include ________.<br/>
Question 26 :
Carbon monoxide is naturally produced by oxidation of<u> X </u>, a gas present in swamp area while it can be produced by<u> Y </u> of fuels containing carbon.
Question 27 :
Deactivated filters in activated carbon method for defluoridation can be activated by:<br/>
Question 28 :
Assertion (A): Fluorosis results, if $F^{-}$ ionconcentration exceeds 3 ppm indrinking water.<br>Reason (R):Nalgonda technique requireslime and aluminum saltsfrom drinking water.<br>
Question 29 :
Process used to obtain pure water for industrial purpose is:  
Question 30 :
Which of the following causes excessive growth of algae and other aquatic plants?
Question 32 :
Which of the following is the most common household method for water purification?
Question 33 :
Which of the following is a step forIndustrial waste water treatment?
Question 34 :
_______ can remove chlorine from treated water, removing any residual protection remaining in the water protecting against pathogens.
Question 38 :
The waste water consisting of domestic sewage industrial effluents, thermal and radioactive pollutants receive some sort of treatment before mixing into water bodies. This measure to control water pollution is called  ________.
Question 43 :
In a small town, pasture is contaminated with airborne fluorides. Grazing animals of that area will suffer from  <span class="_wysihtml5-temp">
Question 45 :
Photochemical oxidants such as PAN and PBN are formed :<br/>A. by the action of nitrogen oxides on hydrocarbons in the presence of sunlight.<br/>B. by the action of carbon dioxide on hydrocarbons in the presence of sunlight.<br/>C. by the action of hydrogen sulphide on hydrocarbons in the presence of sunlight.<br/>
Question 46 :
Assertion: Carbon dioxide is one of the important greenhouse gases.
Reason: It is largely produced by respiratory function of animals and plants.
Question 48 :
Assertion: Emphysema disease is very common in Kanpur and Kolkata.
Reason: It is a disease of respiratory tract occuring due to pollution.
Question 51 :
Photochemical smog consists of excessive amount of $X$, in addition to aldehydes, ketones, peroxy acetyl nitrile (PAN), and so forth. $X$ is: 
Question 52 :
Which pollutant causes(a) Damage to neuron (b) Dryness in throat (c) Headache and blurred vision?
Question 53 : The correct match is:<br/><table class="table table-bordered"><tbody><tr><td> </td><td><b> List - I</b></td><td> </td><td> <b>List - II</b></td></tr><tr><td> A.</td><td> TLV</td><td> 1.</td><td> Oxygen required to oxidise organic substance present in polluted water.</td></tr><tr><td> B.</td><td> COD</td><td> 2.</td><td> Oxygen used by microorganisms present in water for 5 days</td></tr><tr><td> C.</td><td> DO</td><td> 3.</td><td> $O_2$ present in water is in dissolved state.</td></tr><tr><td> D.</td><td> BOD</td><td> 4.</td><td> Permissible level of pollutant that can be present in a mine.</td></tr><tr><td><br/></td><td> </td><td> 5.</td><td> $O_2$ that is present in atmosphere.</td></tr></tbody></table>
Question 54 :
Nitrogen oxides produced from the emission of automobiles and power plants, are the source of fine particles, which lead to
Question 59 :
Which among the following are found to be one of the pollutants of air pollution?
Question 60 :
Assertion: Heavy metals such as cadmium, mercury, nickel etc. are water pollutants.
Reason: Heavy metals are not harmful to humans.
