{"id":5392,"date":"2025-12-26T16:32:23","date_gmt":"2025-12-26T16:32:23","guid":{"rendered":"https:\/\/mehnatt.com\/?p=5392"},"modified":"2025-12-26T16:32:24","modified_gmt":"2025-12-26T16:32:24","slug":"mcqs-based-on-environment-31","status":"publish","type":"post","link":"https:\/\/mehnatt.com\/?p=5392","title":{"rendered":"MCQs Based On Environment &#8211; (31)"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\">Q1. What does BOD (Biological Oxygen Demand) indicate in water quality testing?<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li style=\"font-size:17px\">Amount of bacteria in water<\/li>\n\n\n\n<li style=\"font-size:17px\">Total mineral content<\/li>\n\n\n\n<li style=\"font-size:17px\">Oxygen required by microorganisms to decompose organic matter<\/li>\n\n\n\n<li style=\"font-size:17px\">Level of radioactive pollution<\/li>\n<\/ol>\n\n\n\n<button class=\"acc\">View Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"padding-top:5px;color:#27302a;font-size:1.2rem;\"><b>Correct Option:<\/b> 3. Oxygen required by microorganisms to decompose organic matter  <br\/>\n<strong>Explanation:<\/strong> BOD is a measure of the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material in water. High BOD = high pollution.\n\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Q2. What is a major consequence of high nitrate levels in drinking water?<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li style=\"font-size:17px\">Liver cirrhosis<\/li>\n\n\n\n<li style=\"font-size:17px\">Fluorosis<\/li>\n\n\n\n<li style=\"font-size:17px\">Skin cancer<\/li>\n\n\n\n<li style=\"font-size:17px\">Blue baby syndrome<\/li>\n<\/ol>\n\n\n\n<button class=\"acc\">View Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"padding-top:5px;color:#27302a;font-size:1.2rem;\"><b>Correct Option:<\/b> 4. Blue baby syndrome  <br\/>\n<strong>Explanation:<\/strong> High nitrate levels can convert hemoglobin into methemoglobin, which cannot carry oxygen effectively, leading to blue baby syndrome in infants.\n\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Q3. Which of the following water pollutants is responsible for \u201cMinamata disease\u201d?<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li style=\"font-size:17px\">Arsenic<\/li>\n\n\n\n<li style=\"font-size:17px\">Lead<\/li>\n\n\n\n<li style=\"font-size:17px\">Mercury<\/li>\n\n\n\n<li style=\"font-size:17px\">Cadmium<\/li>\n<\/ol>\n\n\n\n<button class=\"acc\">View Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"padding-top:5px;color:#27302a;font-size:1.2rem;\"><b>Correct Option:<\/b> 3. Mercury  <br\/>\n<strong>Explanation:<\/strong> Minamata disease was caused by mercury poisoning through consumption of fish contaminated by methyl mercury in Japan\u2019s Minamata Bay.\n\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Q4. What is \u201cEutrophication\u201d?<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li style=\"font-size:17px\">Process of water purification using plants<\/li>\n\n\n\n<li style=\"font-size:17px\">Excess nutrients in water leading to algal blooms<\/li>\n\n\n\n<li style=\"font-size:17px\">Biological magnification of toxins in food chains<\/li>\n\n\n\n<li style=\"font-size:17px\">Process of oil extraction from water<\/li>\n<\/ol>\n\n\n\n<button class=\"acc\">View Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"padding-top:5px;color:#27302a;font-size:1.2rem;\"><b>Correct Option:<\/b> 2. Excess nutrients in water leading to algal blooms  <br\/>\n<strong>Explanation:<\/strong> Eutrophication results from excess nitrogen and phosphorus in water, which causes algal blooms. This depletes oxygen and harms aquatic life.\n\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Q5. Which method is NOT an effective water pollution control measure?<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li style=\"font-size:17px\">Use of water hyacinth to absorb toxins<\/li>\n\n\n\n<li style=\"font-size:17px\">Cooling industrial water before discharge<\/li>\n\n\n\n<li style=\"font-size:17px\">Dumping untreated sewage into rivers<\/li>\n\n\n\n<li style=\"font-size:17px\">Using oil zappers to clean oil spills<\/li>\n<\/ol>\n\n\n\n<button class=\"acc\">View Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"padding-top:5px;color:#27302a;font-size:1.2rem;\"><b>Correct Option:<\/b> 3. Dumping untreated sewage into rivers  <br\/>\n<strong>Explanation:<\/strong> Dumping untreated sewage is a major source of water pollution, not a control method. Other options are recognized pollution control techniques.\n\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Q1. What does BOD (Biological Oxygen Demand) indicate in water quality testing? View Answer Correct Option: 3. Oxygen required by microorganisms to decompose organic matter Explanation: BOD is a measure of the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material in water. High BOD = high pollution. Q2. What [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[19],"tags":[222,1027,21,30,59,31,1029,1028,221,20,1030],"class_list":["post-5392","post","type-post","status-publish","format-standard","hentry","category-environment","tag-bank-exams","tag-biological-oxygen-demand","tag-competitive-exams","tag-environment","tag-eutrophication","tag-mcq","tag-minamata-disease","tag-nitrate-levels","tag-rrb-exams","tag-ssc-cgl","tag-water-pollution-control-measure"],"_links":{"self":[{"href":"https:\/\/mehnatt.com\/index.php?rest_route=\/wp\/v2\/posts\/5392","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mehnatt.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mehnatt.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mehnatt.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mehnatt.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5392"}],"version-history":[{"count":8,"href":"https:\/\/mehnatt.com\/index.php?rest_route=\/wp\/v2\/posts\/5392\/revisions"}],"predecessor-version":[{"id":5400,"href":"https:\/\/mehnatt.com\/index.php?rest_route=\/wp\/v2\/posts\/5392\/revisions\/5400"}],"wp:attachment":[{"href":"https:\/\/mehnatt.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5392"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mehnatt.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5392"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mehnatt.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5392"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}