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wbcsgurucomwbcsgurucompdfWBCSPrelimsPaperpdf · A to bring oxygen for breathing B so that sunlight may enter the room C to maintain convectional currents keep the air src=https:reader034vdocumentsnetreader034viewer20220421015e7e003d76fb0c2c33750589html5thumbnails8jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 9button div class=ts-image amp-img class=ts-thumb alt=Page 9: wbcsgurucomwbcsgurucompdfWBCSPrelimsPaperpdf · A to bring oxygen for breathing B so that sunlight may enter the room C to maintain convectional currents keep the air src=https:reader034vdocumentsnetreader034viewer20220421015e7e003d76fb0c2c33750589html5thumbnails9jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 10button div class=ts-image amp-img class=ts-thumb alt=Page 10: wbcsgurucomwbcsgurucompdfWBCSPrelimsPaperpdf · A to bring oxygen for breathing B so that sunlight may enter the room C to maintain convectional currents keep the air 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