{"id":88552,"date":"2025-06-01T07:14:35","date_gmt":"2025-06-01T07:14:35","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=88552"},"modified":"2025-06-01T07:14:35","modified_gmt":"2025-06-01T07:14:35","slug":"soaps-clean-surfaces-on-the-principle-based-on","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/soaps-clean-surfaces-on-the-principle-based-on\/","title":{"rendered":"Soaps clean surfaces on the principle based on"},"content":{"rendered":"

Soaps clean surfaces on the principle based on<\/p>\n

[amp_mcq option1=”Viscosity” option2=”Floatation” option3=”Elasticity” option4=”Surface tension” correct=”option4″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-2 – 2019<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nSoaps are surfactants, meaning they reduce the surface tension of water. Water molecules have strong cohesive forces, leading to high surface tension. This makes it difficult for water to spread and penetrate fabrics or surfaces. Soaps interfere with these forces, lowering surface tension and allowing water to wet surfaces more effectively. Additionally, soap molecules have a hydrophilic (water-attracting) head and a hydrophobic (oil-attracting) tail. The hydrophobic tails surround grease and dirt particles, forming tiny structures called micelles. These micelles, with their hydrophilic heads facing outwards, are soluble in water and can be easily washed away, carrying the dirt with them. This cleaning action is primarily based on the reduction of surface tension and the emulsification\/dispersion of dirt through micelle formation, both consequences of the surfactant properties related to surface tension effects.
\n<\/section>\n
\n– Soaps are surfactants.
\n– Surfactants reduce the surface tension of water.
\n– Reduced surface tension allows water to spread and penetrate effectively.
\n– Soap molecules emulsify grease and dirt by forming micelles.
\n– The fundamental principle involves the interaction of soap at surfaces (related to surface tension).
\n<\/section>\n
\nViscosity is the resistance of a fluid to flow. Floatation is based on buoyancy. Elasticity is the ability of a material to return to its original shape after deformation. While these properties exist, they are not the primary principles behind the cleaning action of soaps. The ability to lower surface tension is key to the wetting and emulsification processes central to how soaps remove dirt.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Soaps clean surfaces on the principle based on [amp_mcq option1=”Viscosity” option2=”Floatation” option3=”Elasticity” option4=”Surface tension” correct=”option4″] This question was previously asked in UPSC NDA-2 – 2019 Download PDFAttempt Online Soaps are surfactants, meaning they reduce the surface tension of water. Water molecules have strong cohesive forces, leading to high surface tension. This makes it difficult for … <\/p>\n

Detailed SolutionSoaps clean surfaces on the principle based on<\/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":[1094],"tags":[1119,1096,1445],"class_list":["post-88552","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-2","tag-1119","tag-chemistry","tag-detergents-and-soap","no-featured-image-padding"],"yoast_head":"\nSoaps clean surfaces on the principle based on<\/title>\n<meta name=\"description\" content=\"Soaps are surfactants, meaning they reduce the surface tension of water. Water molecules have strong cohesive forces, leading to high surface tension. This makes it difficult for water to spread and penetrate fabrics or surfaces. Soaps interfere with these forces, lowering surface tension and allowing water to wet surfaces more effectively. Additionally, soap molecules have a hydrophilic (water-attracting) head and a hydrophobic (oil-attracting) tail. The hydrophobic tails surround grease and dirt particles, forming tiny structures called micelles. These micelles, with their hydrophilic heads facing outwards, are soluble in water and can be easily washed away, carrying the dirt with them. This cleaning action is primarily based on the reduction of surface tension and the emulsification\/dispersion of dirt through micelle formation, both consequences of the surfactant properties related to surface tension effects. - Soaps are surfactants. - Surfactants reduce the surface tension of water. - Reduced surface tension allows water to spread and penetrate effectively. - Soap molecules emulsify grease and dirt by forming micelles. - The fundamental principle involves the interaction of soap at surfaces (related to surface tension).\" \/>\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\/soaps-clean-surfaces-on-the-principle-based-on\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Soaps clean surfaces on the principle based on\" \/>\n<meta property=\"og:description\" content=\"Soaps are surfactants, meaning they reduce the surface tension of water. Water molecules have strong cohesive forces, leading to high surface tension. This makes it difficult for water to spread and penetrate fabrics or surfaces. Soaps interfere with these forces, lowering surface tension and allowing water to wet surfaces more effectively. Additionally, soap molecules have a hydrophilic (water-attracting) head and a hydrophobic (oil-attracting) tail. The hydrophobic tails surround grease and dirt particles, forming tiny structures called micelles. These micelles, with their hydrophilic heads facing outwards, are soluble in water and can be easily washed away, carrying the dirt with them. This cleaning action is primarily based on the reduction of surface tension and the emulsification\/dispersion of dirt through micelle formation, both consequences of the surfactant properties related to surface tension effects. - Soaps are surfactants. - Surfactants reduce the surface tension of water. - Reduced surface tension allows water to spread and penetrate effectively. - Soap molecules emulsify grease and dirt by forming micelles. - The fundamental principle involves the interaction of soap at surfaces (related to surface tension).\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/soaps-clean-surfaces-on-the-principle-based-on\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T07:14:35+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":"Soaps clean surfaces on the principle based on","description":"Soaps are surfactants, meaning they reduce the surface tension of water. 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