{"id":7031,"date":"2024-04-15T02:37:59","date_gmt":"2024-04-15T02:37:59","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=7031"},"modified":"2024-04-15T02:37:59","modified_gmt":"2024-04-15T02:37:59","slug":"in-a-bod-test-1-0-ml-of-raw-sewage-was-diluted-to-100-ml-and-the-dissolved-oxygen-concentration-of-diluted-sample-at-the-beginning-was-6-ppm-and-it-was-4-ppm-at-the-end-of-5-day-incubation-at-20a","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/in-a-bod-test-1-0-ml-of-raw-sewage-was-diluted-to-100-ml-and-the-dissolved-oxygen-concentration-of-diluted-sample-at-the-beginning-was-6-ppm-and-it-was-4-ppm-at-the-end-of-5-day-incubation-at-20a\/","title":{"rendered":"In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20\u00c2\u00b0C. The BOD of raw sewage will be A. 100 ppm B. 200 ppm C. 300 ppm D. 400 ppm"},"content":{"rendered":"<p>[amp_mcq option1=&#8221;100 ppm&#8221; option2=&#8221;200 ppm&#8221; option3=&#8221;The BOD of raw sewage will be A. 100 ppm B. 200 ppm C. 300 ppm&#8221; option4=&#8221;400 ppm&#8221; correct=&#8221;option1&#8243;]<!--more--><\/p>\n<p>The correct answer is A. 100 ppm.<\/p>\n<p>BOD stands for Biochemical Oxygen Demand. It is a measure of the amount of oxygen that is used up by microorganisms in a sample of water over a period of time. The higher the BOD, the more polluted the water is.<\/p>\n<p>In this question, 1.0 ml of raw sewage was diluted to 100 ml. This means that the final concentration of the raw sewage in the sample was 1%. The dissolved oxygen concentration of the diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20\u00c2\u00b0C. This means that the microorganisms in the sample used up 2 ppm of oxygen during the 5 day incubation period.<\/p>\n<p>The BOD of the raw sewage is calculated by multiplying the initial dissolved oxygen concentration by the dilution factor and the percent decrease in dissolved oxygen. In this case, the BOD is calculated as follows:<\/p>\n<p>BOD = (6 ppm)(100\/1) x (1 &#8211; 4\/6) = 100 ppm<\/p>\n<p>Therefore, the correct answer is A. 100 ppm.<\/p>\n<p>Option B is incorrect because it is the BOD of the diluted sample, not the BOD of the raw sewage.<\/p>\n<p>Option C is incorrect because it is the BOD of the raw sewage after 5 days of incubation, not the BOD of the raw sewage at the beginning of the incubation period.<\/p>\n<p>Option D is incorrect because it is the BOD of the raw sewage after 1 day of incubation, not the BOD of the raw sewage at the beginning of the incubation period.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>[amp_mcq option1=&#8221;100 ppm&#8221; option2=&#8221;200 ppm&#8221; option3=&#8221;The BOD of raw sewage will be A. 100 ppm B. 200 ppm C. 300 ppm&#8221; option4=&#8221;400 ppm&#8221; correct=&#8221;option1&#8243;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[647],"tags":[],"class_list":["post-7031","post","type-post","status-publish","format-standard","hentry","category-environmental-engineering","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.2 (Yoast SEO v23.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20\u00c2\u00b0C. The BOD of raw sewage will be A. 100 ppm B. 200 ppm C. 300 ppm D. 400 ppm<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/in-a-bod-test-1-0-ml-of-raw-sewage-was-diluted-to-100-ml-and-the-dissolved-oxygen-concentration-of-diluted-sample-at-the-beginning-was-6-ppm-and-it-was-4-ppm-at-the-end-of-5-day-incubation-at-20a\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20\u00c2\u00b0C. The BOD of raw sewage will be A. 100 ppm B. 200 ppm C. 300 ppm D. 400 ppm\" \/>\n<meta property=\"og:description\" content=\"[amp_mcq option1=&#8221;100 ppm&#8221; option2=&#8221;200 ppm&#8221; option3=&#8221;The BOD of raw sewage will be A. 100 ppm B. 200 ppm C. 300 ppm&#8221; option4=&#8221;400 ppm&#8221; correct=&#8221;option1&#8243;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/in-a-bod-test-1-0-ml-of-raw-sewage-was-diluted-to-100-ml-and-the-dissolved-oxygen-concentration-of-diluted-sample-at-the-beginning-was-6-ppm-and-it-was-4-ppm-at-the-end-of-5-day-incubation-at-20a\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2024-04-15T02:37:59+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20\u00c2\u00b0C. The BOD of raw sewage will be A. 100 ppm B. 200 ppm C. 300 ppm D. 400 ppm","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/exam.pscnotes.com\/mcq\/in-a-bod-test-1-0-ml-of-raw-sewage-was-diluted-to-100-ml-and-the-dissolved-oxygen-concentration-of-diluted-sample-at-the-beginning-was-6-ppm-and-it-was-4-ppm-at-the-end-of-5-day-incubation-at-20a\/","og_locale":"en_US","og_type":"article","og_title":"In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20\u00c2\u00b0C. The BOD of raw sewage will be A. 100 ppm B. 200 ppm C. 300 ppm D. 400 ppm","og_description":"[amp_mcq option1=&#8221;100 ppm&#8221; option2=&#8221;200 ppm&#8221; option3=&#8221;The BOD of raw sewage will be A. 100 ppm B. 200 ppm C. 300 ppm&#8221; option4=&#8221;400 ppm&#8221; correct=&#8221;option1&#8243;]","og_url":"https:\/\/exam.pscnotes.com\/mcq\/in-a-bod-test-1-0-ml-of-raw-sewage-was-diluted-to-100-ml-and-the-dissolved-oxygen-concentration-of-diluted-sample-at-the-beginning-was-6-ppm-and-it-was-4-ppm-at-the-end-of-5-day-incubation-at-20a\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2024-04-15T02:37:59+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/in-a-bod-test-1-0-ml-of-raw-sewage-was-diluted-to-100-ml-and-the-dissolved-oxygen-concentration-of-diluted-sample-at-the-beginning-was-6-ppm-and-it-was-4-ppm-at-the-end-of-5-day-incubation-at-20a\/","url":"https:\/\/exam.pscnotes.com\/mcq\/in-a-bod-test-1-0-ml-of-raw-sewage-was-diluted-to-100-ml-and-the-dissolved-oxygen-concentration-of-diluted-sample-at-the-beginning-was-6-ppm-and-it-was-4-ppm-at-the-end-of-5-day-incubation-at-20a\/","name":"In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20\u00c2\u00b0C. 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