{"id":87699,"date":"2025-06-01T06:51:29","date_gmt":"2025-06-01T06:51:29","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=87699"},"modified":"2025-06-01T06:51:29","modified_gmt":"2025-06-01T06:51:29","slug":"a-fuse-wire-must-be","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/a-fuse-wire-must-be\/","title":{"rendered":"A fuse wire must be"},"content":{"rendered":"

A fuse wire must be<\/p>\n

[amp_mcq option1=”conducting and of low melting point” option2=”conducting and of high melting point” option3=”insulator and of high melting point” option4=”insulator and of low melting point” correct=”option1″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-1 – 2019<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe correct option is A) conducting and of low melting point. A fuse wire must possess these properties to function correctly as a safety device.
\n<\/section>\n
\n– A fuse wire is designed to protect electrical circuits and appliances from damage due to excessive current.
\n– It is connected in series with the circuit, so it must be able to conduct electricity under normal operating conditions. Thus, it must be **conducting**.
\n– When the current flowing through the circuit exceeds a specified limit (the fuse rating), the fuse wire heats up due to the Joule effect (heat = I\u00b2Rt).
\n– To break the circuit and stop the excessive current flow, the fuse wire must melt when it gets too hot. This requires it to have a **low melting point**.
\n– If the fuse wire had a high melting point or was an insulator, it would not serve its purpose as a safety device.
\n<\/section>\n
\nFuse wires are typically made of materials like tin, lead, or an alloy of tin and lead, which have relatively low melting points compared to the wires used in the rest of the circuit (like copper). The thickness and material of the fuse wire are carefully chosen to ensure it melts at the desired current level. Modern circuits often use circuit breakers instead of fuses, which are resettable switches that automatically trip when current is too high.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

A fuse wire must be [amp_mcq option1=”conducting and of low melting point” option2=”conducting and of high melting point” option3=”insulator and of high melting point” option4=”insulator and of low melting point” correct=”option1″] This question was previously asked in UPSC NDA-1 – 2019 Download PDFAttempt Online The correct option is A) conducting and of low melting point. … <\/p>\n

Detailed SolutionA fuse wire must be<\/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":[1093],"tags":[1119,1201,1128],"class_list":["post-87699","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-1","tag-1119","tag-electric-current","tag-physics","no-featured-image-padding"],"yoast_head":"\nA fuse wire must be<\/title>\n<meta name=\"description\" content=\"The correct option is A) conducting and of low melting point. A fuse wire must possess these properties to function correctly as a safety device. - A fuse wire is designed to protect electrical circuits and appliances from damage due to excessive current. - It is connected in series with the circuit, so it must be able to conduct electricity under normal operating conditions. Thus, it must be **conducting**. - When the current flowing through the circuit exceeds a specified limit (the fuse rating), the fuse wire heats up due to the Joule effect (heat = I\u00b2Rt). - To break the circuit and stop the excessive current flow, the fuse wire must melt when it gets too hot. This requires it to have a **low melting point**. - If the fuse wire had a high melting point or was an insulator, it would not serve its purpose as a safety device.\" \/>\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\/a-fuse-wire-must-be\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A fuse wire must be\" \/>\n<meta property=\"og:description\" content=\"The correct option is A) conducting and of low melting point. A fuse wire must possess these properties to function correctly as a safety device. - A fuse wire is designed to protect electrical circuits and appliances from damage due to excessive current. - It is connected in series with the circuit, so it must be able to conduct electricity under normal operating conditions. Thus, it must be **conducting**. - When the current flowing through the circuit exceeds a specified limit (the fuse rating), the fuse wire heats up due to the Joule effect (heat = I\u00b2Rt). - To break the circuit and stop the excessive current flow, the fuse wire must melt when it gets too hot. This requires it to have a **low melting point**. - If the fuse wire had a high melting point or was an insulator, it would not serve its purpose as a safety device.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/a-fuse-wire-must-be\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T06:51:29+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":"A fuse wire must be","description":"The correct option is A) conducting and of low melting point. 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Thus, it must be **conducting**. - When the current flowing through the circuit exceeds a specified limit (the fuse rating), the fuse wire heats up due to the Joule effect (heat = I\u00b2Rt). - To break the circuit and stop the excessive current flow, the fuse wire must melt when it gets too hot. This requires it to have a **low melting point**. - If the fuse wire had a high melting point or was an insulator, it would not serve its purpose as a safety device.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/a-fuse-wire-must-be\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T06:51:29+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\/a-fuse-wire-must-be\/","url":"https:\/\/exam.pscnotes.com\/mcq\/a-fuse-wire-must-be\/","name":"A fuse wire must be","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T06:51:29+00:00","dateModified":"2025-06-01T06:51:29+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The correct option is A) conducting and of low melting point. A fuse wire must possess these properties to function correctly as a safety device. - A fuse wire is designed to protect electrical circuits and appliances from damage due to excessive current. - It is connected in series with the circuit, so it must be able to conduct electricity under normal operating conditions. Thus, it must be **conducting**. - When the current flowing through the circuit exceeds a specified limit (the fuse rating), the fuse wire heats up due to the Joule effect (heat = I\u00b2Rt). - To break the circuit and stop the excessive current flow, the fuse wire must melt when it gets too hot. 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