<div> <h4 id="successchaptersuccess"><Success>Chapter</Success></h4> <h4 id="successenvironmental-issuessuccess"><Success>Environmental Issues</Success></h4> </div>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <div> <h4 id="primarymultiple-choice-questions-mcqsprimary"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> </div>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-1"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ques.</strong> Non-biodegradable pollutants are created by</p> <p class="fragment">(a) Nature <br> (b) Excessive use of resources <br> (c) Humans <br> (d) Natural disasters </p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-2"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Thinking Process</strong></p> <ul> <li>On the basis of degradation/natural disposal, pollutants may be biodegradable and non-biodegradable.</li> <li>Nature and natural disasters don’t generate non-biodegradable waste.</li> </ul> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-3"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ans.</strong> (c)</p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-4"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <font size ="5"> <p><strong>Sol.</strong> Non-biodegradable pollutants have a slow or zero rate of degradation by general biological processes.</p> <ul> <li> <p>They include plastics, tin container, heavy metals, radioactive substances, etc.</p> </li> <li> <p>These are created by human activities.</p> </li> <li> <p>like industrilisation.</p> </li> <li> <p>Biodegradable pollutant are degraded or disposed quickly by biological processes.</p> </li> <li> <p>Some biodegradable pollutant created by human are paper, house hold waste like peel of vegetables, fruits and sewage.</p> </li> </ul> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-5"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ques.</strong> According to the Central Pollution Control Board, particles that are responsible for causing great harm to human health are of diameter</p> <p class="fragment">(a) 2.50 micrometers <br> (b) 5.00 micrometers <br> (c) 10.00 micrometers <br> (d) 7.5 micrometers </p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-6"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Thinking Process</strong></p> <ul> <li>Air pollutants are gaseous material, radioactive substances and particulate matter.</li> </ul> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-7"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ans.</strong> (a)</p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-8"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Sol.</strong> Particulate air pollutant like soot, flyash, dust of various types, pollens, spores, fur, hair, etc., can be differentiated as setteable $(10 \mu \mathrm{m}$ or more) and suspended, (less than $10 \mu \mathrm{m})$ particulate matter pollutant.</p> <p><Success>Sol. to be continued</Success></p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-9"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <ul> <li>Their effect (on the environment) depends on the size of particles.</li> <li>According to CPCB particulate matter of $2.5 \mu \mathrm{m}$ or less in diameter are responsible for causing great harm to human health.</li> <li>The particular matter of 2.5 or less in size are inhaled deep into the respiratory tract (upto lungs) and causes respiratory problems and may even lead to death.</li> </ul> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-10"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ques.</strong> The material generally used for sound proofing of rooms like a recording studio and auditorium etc., is</p> <p class="fragment">(a) Cotton <br> (b) Coir <br> (c) Wood <br> (d) Styrofoam </p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-11"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ans.</strong> (d)</p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-12"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Sol.</strong> The material generally used for sound proofing of rooms like recording studio, cinema hall, auditorium which absorb sound and facilitate in proofing is styrofoam.</p> <ul> <li>Ear plugs (device used by working person of commercial and industrial zone) are made up of very fine glass wood or cotton wood impregnanted with wax while ear muffs contain fluid seals or plastic foam for absorbing sound.</li> </ul> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-13"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ques.</strong> Compressed Natural Gas (CNG) is</p> <p class="fragment">(a) Propane <br> (b) Methane <br> (c) Ethane <br> (d) Butane </p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-14"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ans.</strong> (b)</p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-15"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <font size ="6"> <p><strong>Sol.</strong> Compressed Natural Gas (CNG) is the best and cheap fuel.</p> <ul> <li> <p>It has replaced petrol and diesel fuel as it is considered as clean fuel.</p> </li> <li> <p>CNG consists of around $90 \%$ methane, by compressing it to less than $1 \%$ of volume it occupies at standard atmospheric pressure.</p> </li> <li> <p>Propane and butane together form LPG or liquified petroleum gas while ethane is used in chemical industry to produce ethene.</p> </li> </ul> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-16"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ques.</strong> World’s most problematic aquatic weed is</p> <p class="fragment">(a) Azolla <br> (b) Wolffia <br> (c) Eichhornia <br> (d) Trapa </p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-17"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ans.</strong> (c)</p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-18"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Sol.</strong> Eichhornia (water hyacinth) has been introduced in India to check water pollution, as this weed absorbs mercury, cadmium, lead and nickel from sewage water.</p> <ul> <li>It is considered as worlds most problematic weed as it is on invasive species.</li> <li>If not controlled, water hyacinth covers the enitre pond or ake and impacts water flow.</li> <li>Blocks sunlight, acts as prime habitat for mosquito (vector) snails host for flatworm and starves water of oxygen.</li> </ul> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-19"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ques.</strong> Which of the following causes biomagnification?</p> <p class="fragment">(a) $\mathrm{SO}_{2}$ <br> (b) Mercury <br> (c) DDT <br> (d) Both (b) and (c) </p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-20"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ans.</strong> (d)</p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-21"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Sol.</strong> Biomagnification, also called as bioaccumulation is the accumulation of non-biodegradable toxic material like $\mathrm{Hg}$, DDT, etc,, in different trophic levels.</p> <p><Success>Sol. to be continued</Success></p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-22"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <ul> <li>In the process of bioaccumulation, the concentration of non- biodegradable pollulants increases at each successive trophic level of the food chain, thus harming the environment/ecosystem at an alarming rate, whereas $\mathrm{SO}_{2}$ (Isulphur dioxide) is an air pollutant and acts as precursor of acid rain.</li> </ul> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-23"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ques.</strong> The expanded form of DDT is</p> <p class="fragment">(a) Dichloro diphenyl trichloroethane <br> (b) Dichloro diethyl trichloroethane <br> (c) Dichloro dipyrydyl trichloroethane <br> (d) Dichloro diphenyl tetrachloroacetate </p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-24"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ans.</strong> (a)</p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-25"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Sol.</strong> The expanded form of DDT is dechloro diphenyl trichloroethane.</p> <ul> <li>It is an insectiside which was first synthesised in 1874.</li> <li>in insects it opens the sodium ion channels in neurons which leads to spas on and eventual death DDT, BHC are organic compound which were effectively used against pest during 1970 and 1980.</li> <li>But, now these are banned due to their less or no degradation.</li> </ul> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-26"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ques.</strong> Which of the following material takes the longest time for biodegradation?</p> <p class="fragment">(a) Cotton <br> (b) Paper <br> (c) Bone <br> (d) Jute </p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-27"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ans.</strong> (c)</p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-28"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Sol.</strong> Out of the given options, bone takes the longest time for biodegradation, whereas cotton, paper and jute can be easily degraded by the action of microbes.</p> <ul> <li>Bone is made up of a protein fraction, mineral fraction and organic compounds.</li> </ul> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-29"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <font size ="6"> <p><strong>Ques.</strong> Choose the incorrect statement.</p> <p class="fragment">(a) The Montreal protocol is associated with the control of emission of ozone depleting substances <br> (b) Methane and carbon dioxide are green house gases <br> (c) Dobson units are used to measure oxygen content <br> (d) Use of incinerators is crucial to disposal of hospital wastes </p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-30"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ans.</strong> (c)</p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-31"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Sol.</strong> <strong>Dobson unit is</strong> used to express the column on dessity of trace gases e.g., ozone.</p> <ul> <li>On the other hand, oxygen sensors are used to measure the exhaust gas concentration of oxygen</li> </ul> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-32"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ques.</strong> Among the following which one causes more indoor chemical pollution?</p> <p class="fragment">(a) Burning coal <br> (b) Burning cooking gas <br> (c) Burning mosquito coil <br> (d) Room spray </p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-33"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ans.</strong> (a)</p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-34"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Sol.</strong> Burning coal is the cause of major indoor chemical pollution.</p> <ul> <li>It releases carbon content in the atmosphere which combines with oxygen to form carbon dioxide, a threat to environment or may result in the formation of carbon monoxide which is a threat to human health.</li> </ul> <p><Success>Sol. to be continued</Success></p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-35"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <ul> <li>Burning of coal also releases inhalable particlen nitrogen oxides sulphur dioxides metal and silicates.</li> <li>Although of mosquito coil and room spray causes indoor chemical pollution but their effects are long term.</li> </ul> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-36"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ques.</strong> The green scum seen in the freshwater bodies is</p> <p class="fragment">(a) Blue green algae <br> (b) Red algae <br> (c) Green algae <br> (d) Both (a) and (c) </p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-37"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ans.</strong> (d)</p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-38"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Sol.</strong> The green scum seen in the fresh water bodies mainly consists of green algae and blue-green algae, while the red algae is mostly marine.</p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-39"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ques.</strong> The loudness of a sound that a person can withstand without discomfort is about</p> <p class="fragment">(a) $150 \mathrm{~dB}$ <br> (b) $215 \mathrm{~dB}$ <br> (c) $30 \mathrm{~dB}$ <br> (d) $80 \mathrm{~dB}$ </p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-40"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ans.</strong> (d)</p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-41"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Sol.</strong> Relative loudness of sound ranges from $30 \mathrm{~dB}-60 \mathrm{~dB}$ and is generally not hazardous.</p> <ul> <li>The loudness above $60-80 \mathrm{~dB}$, is not much uncomfortable while prolonged exposure to noise level above $80 \mathrm{~dB}$ is painful and gradually leads to permanent loss of hearing ability or deafness.</li> </ul> <p><Success>Sol. to be continued</Success></p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-42"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <ul> <li>The premissible sound level in different areas is shown in the following table</li> </ul> <table> <thead> <tr> <th style="text-align:left"></th> <th style="text-align:center">Day</th> <th style="text-align:center">Night</th> </tr> </thead> <tbody> <tr> <td style="text-align:left">Industrial</td> <td style="text-align:center">$75 \mathrm{~dB}$</td> <td style="text-align:center">$70 \mathrm{~dB}$</td> </tr> <tr> <td style="text-align:left">Commercial</td> <td style="text-align:center">$65 \mathrm{~dB}$</td> <td style="text-align:center">$55 \mathrm{~dB}$</td> </tr> <tr> <td style="text-align:left">Residential</td> <td style="text-align:center">$55 \mathrm{~dB}$</td> <td style="text-align:center">$45 \mathrm{~dB}$</td> </tr> <tr> <td style="text-align:left">Silent</td> <td style="text-align:center">$50 \mathrm{~dB}$</td> <td style="text-align:center">$40 \mathrm{~dB}$</td> </tr> </tbody> </table> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-43"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ques.</strong> The major source of noise pollution, world wide is due to</p> <p class="fragment">(a) Office equipment <br> (b) Transport system <br> (c) Sugar, textile and paper industries <br> (d) Oil refineries and thermal power plants </p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-44"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ans.</strong> (b)</p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-45"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Sol.</strong> The major source of noise pollution, worldwide is transport system i.e., transport vehicles (both public and private).</p> <ul> <li>Whereas all machines (noise producing) wheather, agricultural or engine of motor, vehicle and machine employed in various industries like textile, printing, sugar, engineering and agricultural implements are also sources of noise pollution.</li> </ul> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-46"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ques.</strong> Match correctly the following and choose the correct option</p> <table> <thead> <tr> <th style="text-align:center">A.</th> <th style="text-align:center">Environment Protection Act</th> <th style="text-align:center">1. 1974</th> </tr> </thead> <tbody> <tr> <td style="text-align:center">B.</td> <td style="text-align:center">Air Prevention and Control of Pollution Act</td> <td style="text-align:center">2. 1987</td> </tr> <tr> <td style="text-align:center">C.</td> <td style="text-align:center">Water Act</td> <td style="text-align:center">3. 1986</td> </tr> <tr> <td style="text-align:center">D.</td> <td style="text-align:center">Amendment of Air Act to include noise</td> <td style="text-align:center">4. 1981</td> </tr> </tbody> </table> <p><Success>Ques. to be continued</Success></p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-47"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <table> <thead> <tr> <th style="text-align:center"></th> <th style="text-align:center">A</th> <th style="text-align:center">B</th> <th style="text-align:center">C</th> <th style="text-align:center">D</th> </tr> </thead> <tbody> <tr> <td style="text-align:center">(a)</td> <td style="text-align:center">3</td> <td style="text-align:center">4</td> <td style="text-align:center">1</td> <td style="text-align:center">2</td> </tr> <tr> <td style="text-align:center">(b)</td> <td style="text-align:center">1</td> <td style="text-align:center">3</td> <td style="text-align:center">2</td> <td style="text-align:center">4</td> </tr> <tr> <td style="text-align:center">(c)</td> <td style="text-align:center">4</td> <td style="text-align:center">1</td> <td style="text-align:center">2</td> <td style="text-align:center">3</td> </tr> <tr> <td style="text-align:center">(d)</td> <td style="text-align:center">3</td> <td style="text-align:center">4</td> <td style="text-align:center">2</td> <td style="text-align:center">1</td> </tr> </tbody> </table> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-48"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ans.</strong> (a)</p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-49"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Sol.</strong> Environment Protection Act came into force on November 1986, at the birth anniversary of late Prime Minister of India Smt. Indira Gandhi.</p> <ul> <li>Air prevention and central of pollution Act came into force in 1981 which is meant for the preservation of quality air.</li> </ul> <p><Success>Sol. to be continued</Success></p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-50"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <ul> <li> <p>Water Act 1974 is meant for restoration of quality of all type of surface and ground water.</p> </li> <li> <p>In 1987 Amendment of Air Act to include noise came into existance (force).</p> </li> </ul> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-51"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ques.</strong> Catalytic converters are fitted into automobiles to reduce emission of harmful gases.</p> <ul> <li>Catalytic converters change unburnt hydrocarbons into</li> </ul> <p class="fragment">(a) Carbon dioxide and water <br> (b) Carbon mono oxide <br> (c) Methane <br> (d) Carbon dioxide and methane </p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-52"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ans.</strong> (a)</p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-53"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Sol.</strong> Catalytic converters contain costly metals like rhodium and platinum-palladium as catalysts, and when exhaust gas passes to fitted catalytic converter, the unburnt hydrocarbons (cause of cancer) are oxidised into water and carbon dioxide.</p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-54"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ques.</strong> Why is it necessary to remove sulphur from petroleum products?</p> <p class="fragment">(a) To reduce the emission of sulphur dioxide in exhaust fumes <br> (b) To increase efficiency of automobiles engines <br> (c) To use sulphur removed from petroleum for commercial purposes <br> (d) To increase the life span of engine silencers </p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-55"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ans.</strong> (a)</p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-56"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Sol.</strong> Removal of sulphur from petrolium product (diesel) reduces the emission of oxides of sulphur like $SO_{2}$ and $SO_{3}$ in the exhaust fumes.</p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-57"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ques.</strong> Which one of the following impurities is easiest to remove from waste water?</p> <p class="fragment">(a) Bacteria <br> (b) Colloids <br> (c) Dissolved solids <br> (d) Suspended solids </p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-58"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Thinking Process</strong></p> <ul> <li>Domestic sewage (household waste water) consists of everything which are transferred from residential blocks to sewer.</li> </ul> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-59"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ans.</strong> (d)</p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-60"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Sol.</strong> Three type of impurities are found in waste water, suspended particles (solids), colloidal impurities and dissolved material (inorganic and organic) like calcium, ammonia, toxic material, phosphate, sodium, calcium and nitrate.</p> <ul> <li>Out of them suspended solids like sand silt and clay impurities are easily removed, in sewage treatment plants.</li> </ul> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>

<div style='text-align : center'> <Success><font size="5"><b>Environmental Issues</b></font></Success> </div> <h4 id="primarymultiple-choice-questions-mcqsprimary-61"><Primary>Multiple Choice Questions (MCQs)</Primary></h4> <hr> <div class="text-container"> <p><strong>Ques.</strong> Which one of the following diseases is not due to contamination of water?</p> <p class="fragment">(a) Hepatitis-B <br> (b) Jaundice <br> (c) Cholera <br> (d) Typhoid </p> </font> </div> <hr> <font size ="4"> <div style='text-align : center'> <span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions </div> </font>