{"id":38914,"date":"2024-04-24T07:51:37","date_gmt":"2024-04-24T07:51:37","guid":{"rendered":"https:\/\/edukemy.com\/blog\/?p=38914"},"modified":"2024-04-24T07:51:38","modified_gmt":"2024-04-24T07:51:38","slug":"upsc-prelims-2015-question-18","status":"publish","type":"post","link":"https:\/\/edukemy.com\/blog\/upsc-prelims-2015-question-18\/","title":{"rendered":"UPSC Prelims 2015 &#8211; Question 18"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full is-resized\"><a href=\"https:\/\/edukemy.com\/upsc\/upsc-prelims-test-series?utm_source=Blog&amp;utm_medium=Blog&amp;utm_campaign=Blog-%20PTS\" target=\"_blank\" rel=\"noreferrer noopener\"><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2024\/02\/Prelims-Test-Series-eng-and-hindi-1280\u00d7330.svg\" alt=\"UPSC Prelims Mock Test - ECONOMY 2\" class=\"wp-image-24924\" width=\"779\" height=\"199\"\/><\/a><\/figure>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<label for=\"ez-toc-cssicon-toggle-item-6a528bcc0a79d\" class=\"ez-toc-cssicon-toggle-label\"><p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-cssicon\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6a528bcc0a79d\"  \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-2015-question-18\/#Q_With_reference_to_%E2%80%98fly_ash_produced_by_the_power_plants_using_coal_as_fuel_which_of_the_following_statements_isare_correct\" >Q: With reference to \u2018fly ash\u2019 produced by the power plants using coal as fuel, which of the following statements is\/are correct?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-2015-question-18\/#The_correct_answer_is%E2%80%AF1_and_2\" >The correct answer is\u202f1 and 2.&nbsp;<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-2015-question-18\/#Fly_ash%E2%80%AF\" >Fly ash\u202f\u00a0<\/a><ul class='ez-toc-list-level-5' ><li class='ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-2015-question-18\/#Benefits_of_Fly_Ash\" >Benefits of Fly Ash\u00a0<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-2015-question-18\/#In_case_you_still_have_your_doubts_contact_us_on_9811333901\" >In case you still have your doubts, contact us on 9811333901.&nbsp;<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-2015-question-18\/#Visit_our_YouTube_Channel_%E2%80%93_here\" >Visit our YouTube Channel &#8211;&nbsp;here<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q_With_reference_to_%E2%80%98fly_ash_produced_by_the_power_plants_using_coal_as_fuel_which_of_the_following_statements_isare_correct\"><\/span>Q: With reference to \u2018fly ash\u2019 produced by the power plants using coal as fuel, which of the following statements is\/are correct?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ol class=\"wp-block-list\"><li>Fly ash can be used in the production of bricks for building construction.<\/li><li>Fly ash can be used as a replacement for some of the Portland cement contents of concrete.<\/li><li>Fly ash is made up of silicon dioxide and calcium oxide only, and does not contain any toxic elements.<\/li><\/ol>\n\n\n\n<p>Select the correct answer using the code given below:<\/p>\n\n\n\n<p>a) 1 and 2<\/p>\n\n\n\n<p>b) 2 only<\/p>\n\n\n\n<p>c) 1 and 3<\/p>\n\n\n\n<p>d) 3 only<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"The_correct_answer_is%E2%80%AF1_and_2\"><\/span>The correct answer is\u202f<strong>1 and 2<\/strong>.&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Fly_ash%E2%80%AF\"><\/span><strong>Fly ash<\/strong>\u202f\u00a0<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>It is the finely divided residue that results from the combustion of pulverised coal and is transported from the combustion chamber by exhaust gases.<\/strong>\u00a0<\/li><li>It is produced by coal-fired electric and steam-generating plants.\u00a0<\/li><li><strong>It is\u202fused annually in a variety of engineering applications that\u202finclude: Portland cement concrete (PCC), soil and road base stabilization, flowable fills, grouts, structural fill and asphalt filler.\u202fHence, Statement 1 is correct.<\/strong>\u00a0<\/li><li>Portland cement, Embankment, Soil stabilization, Flowable fill, Asphalt concrete, Geopolymers, Roller compacted concrete, Bricks, Metal matrix composites, Waste treatment and stabilization, Catalyst.<\/li><\/ul>\n\n\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Benefits_of_Fly_Ash\"><\/span><strong>Benefits of Fly Ash<\/strong>\u00a0<span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>extending the lifespan of concrete structures and roadways by enhancing concrete durability, Hence, Statement 2 is correct.<\/strong>\u00a0<\/li><li>a decrease in energy consumption, greenhouse gas emissions, and other harmful air emissions when fly ash is utilised in place of or in addition to made cement,\u00a0<\/li><li>a decrease in the volume of coal combustion waste that must be dumped in landfills, and\u00a0<\/li><li>protection of other materials and natural resources.\u00a0<\/li><li><strong>It consists primarily of oxides of silicon, aluminium iron and calcium. Magnesium, potassium, sodium, titanium, and sulphur are also present to a lesser degree.\u202fHence, Statement 3 is not correct.<\/strong>\u00a0<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><a href=\"https:\/\/edukemy.com\/upsc\/upsc-essay?utm_source=Blog&amp;utm_medium=Banner&amp;utm_campaign=Essay\" target=\"_blank\" rel=\"noreferrer noopener\"><img decoding=\"async\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2024\/06\/UPSC-Essay-Course-1280\u00d7300-1-3.svg\" alt=\"\" class=\"wp-image-42688 lazyload\" width=\"781\" height=\"182\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 781px; --smush-placeholder-aspect-ratio: 781\/182;\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"block-c6ab63ae-7083-4831-b519-cb89dacafb18\"><span class=\"ez-toc-section\" id=\"In_case_you_still_have_your_doubts_contact_us_on_9811333901\"><\/span><strong>In case you still have your doubts, contact us on 9811333901.<\/strong>&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p id=\"block-52c5a91b-6ed6-46e3-b781-7cc0c63a0b76\">For UPSC Prelims Resources,&nbsp;<a href=\"https:\/\/edukemy.com\/upsc-cse-prelims-resource-centre\" target=\"_blank\" rel=\"noreferrer noopener\">Click here<\/a><\/p>\n\n\n\n<p id=\"block-d014fe86-d628-49d8-82ce-6c60dc6e7a73\">For Daily Updates and Study Material:<\/p>\n\n\n\n<p id=\"block-38177954-e668-4d8d-b250-d0fbd5a09390\">Join our Telegram Channel &#8211;&nbsp;<a href=\"https:\/\/t.me\/WithEdukemy4IAS\" target=\"_blank\" rel=\"noreferrer noopener\">Edukemy for IAS<\/a><\/p>\n\n\n\n<ul class=\"wp-block-list\" id=\"block-49ca2fe3-109f-4a88-b72e-9df49c3d328e\"><li>1. 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Mains Answer Writing Practice &#8211;&nbsp;<a href=\"https:\/\/bit.ly\/3mZuVxl\" target=\"_blank\" rel=\"noreferrer noopener\">here<\/a><\/li><\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"block-43ccddc1-5348-445f-ab6b-7baaf29fe58d\"><span class=\"ez-toc-section\" id=\"Visit_our_YouTube_Channel_%E2%80%93_here\"><\/span>Visit our YouTube Channel &#8211;&nbsp;<a href=\"https:\/\/www.youtube.com\/@EduKemyforIAS\" target=\"_blank\" rel=\"noreferrer noopener\">here<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n","protected":false},"excerpt":{"rendered":"<p>Q: With reference to \u2018fly ash\u2019 produced by the power plants using coal as fuel, which of the following statements is\/are correct?<\/p>\n","protected":false},"author":21,"featured_media":38915,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"_lmt_disableupdate":"","_lmt_disable":"","footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[1644],"tags":[232,231,3256,179,140],"class_list":["post-38914","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-upsc-prelims","tag-upsc","tag-upsc-prelims","tag-upsc-prelims-2015","tag-upsc-prelims-strategy","tag-upsc_preparation_strategy"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.9 - 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