{"id":93148,"date":"2025-06-01T11:42:51","date_gmt":"2025-06-01T11:42:51","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=93148"},"modified":"2025-06-01T11:42:51","modified_gmt":"2025-06-01T11:42:51","slug":"which-one-of-the-following-is-not-detected-by-fire-detectors","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-not-detected-by-fire-detectors\/","title":{"rendered":"Which one of the following is not detected by fire detectors ?"},"content":{"rendered":"

Which one of the following is not detected by fire detectors ?<\/p>\n

[amp_mcq option1=”Radiation” option2=”Heat” option3=”Light” option4=”Smoke” correct=”option1″]<\/p>\n

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\n
This question was previously asked in<\/div>\n
UPSC CISF-AC-EXE – 2022<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nFire detectors are designed to detect signs of fire: Smoke, Heat, or specific types of Radiation (like UV or Infrared) emitted by flames. Standard fire detectors do not typically detect other forms of radiation, such as X-rays or nuclear radiation, which are not characteristics of a typical fire. While flame detectors detect UV\/IR radiation from the fire itself, the term ‘Radiation’ alone is broad and can encompass types not related to fire. Given the other options (Heat, Light, Smoke) are directly detected by common types of fire detectors (heat detectors, smoke detectors, flame detectors), ‘Radiation’, interpreted broadly (e.g., X-rays), is the phenomenon not typically detected by fire detectors.
\n<\/section>\n
\n– Fire detection methods include sensing smoke, heat, and flame.
\n– Flame detectors specifically detect UV and IR radiation from flames.
\n– Standard fire detectors do not detect other forms of radiation like X-rays or nuclear radiation.
\n<\/section>\n
\nCommon types of fire detectors are smoke detectors (ionization and photoelectric), heat detectors (fixed temperature and rate-of-rise), and flame detectors (UV, IR, or UV\/IR). While ‘Light’ could refer to visible light (less common for primary detection than UV\/IR), and ‘Radiation’ specifically refers to the UV\/IR detected by flame detectors, the option ‘Radiation’ alone is broad enough to include types not related to fire, making it the least likely phenomenon detected by *fire* detectors in a general sense. Assuming ‘Radiation’ is not limited to UV\/IR from flame, it is the correct answer.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following is not detected by fire detectors ? [amp_mcq option1=”Radiation” option2=”Heat” option3=”Light” option4=”Smoke” correct=”option1″] This question was previously asked in UPSC CISF-AC-EXE – 2022 Download PDFAttempt Online Fire detectors are designed to detect signs of fire: Smoke, Heat, or specific types of Radiation (like UV or Infrared) emitted by flames. Standard … <\/p>\n

Detailed SolutionWhich one of the following is not detected by fire detectors ?<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1089],"tags":[1108,1113],"class_list":["post-93148","post","type-post","status-publish","format-standard","hentry","category-upsc-cisf-ac-exe","tag-1108","tag-information-and-communication-technology","no-featured-image-padding"],"yoast_head":"\nWhich one of the following is not detected by fire detectors ?<\/title>\n<meta name=\"description\" content=\"Fire detectors are designed to detect signs of fire: Smoke, Heat, or specific types of Radiation (like UV or Infrared) emitted by flames. Standard fire detectors do not typically detect other forms of radiation, such as X-rays or nuclear radiation, which are not characteristics of a typical fire. While flame detectors detect UV\/IR radiation from the fire itself, the term 'Radiation' alone is broad and can encompass types not related to fire. Given the other options (Heat, Light, Smoke) are directly detected by common types of fire detectors (heat detectors, smoke detectors, flame detectors), 'Radiation', interpreted broadly (e.g., X-rays), is the phenomenon not typically detected by fire detectors. - Fire detection methods include sensing smoke, heat, and flame. - Flame detectors specifically detect UV and IR radiation from flames. - Standard fire detectors do not detect other forms of radiation like X-rays or nuclear radiation.\" \/>\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\/which-one-of-the-following-is-not-detected-by-fire-detectors\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which one of the following is not detected by fire detectors ?\" \/>\n<meta property=\"og:description\" content=\"Fire detectors are designed to detect signs of fire: Smoke, Heat, or specific types of Radiation (like UV or Infrared) emitted by flames. Standard fire detectors do not typically detect other forms of radiation, such as X-rays or nuclear radiation, which are not characteristics of a typical fire. While flame detectors detect UV\/IR radiation from the fire itself, the term 'Radiation' alone is broad and can encompass types not related to fire. Given the other options (Heat, Light, Smoke) are directly detected by common types of fire detectors (heat detectors, smoke detectors, flame detectors), 'Radiation', interpreted broadly (e.g., X-rays), is the phenomenon not typically detected by fire detectors. - Fire detection methods include sensing smoke, heat, and flame. - Flame detectors specifically detect UV and IR radiation from flames. - Standard fire detectors do not detect other forms of radiation like X-rays or nuclear radiation.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-not-detected-by-fire-detectors\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T11:42:51+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":"Which one of the following is not detected by fire detectors ?","description":"Fire detectors are designed to detect signs of fire: Smoke, Heat, or specific types of Radiation (like UV or Infrared) emitted by flames. 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