{"id":2433,"date":"2025-05-02T12:31:01","date_gmt":"2025-05-02T07:01:01","guid":{"rendered":"https:\/\/lotusarise.com\/qna\/?p=2433"},"modified":"2025-05-02T12:31:02","modified_gmt":"2025-05-02T07:01:02","slug":"q-consider-the-following-statements-144","status":"publish","type":"post","link":"https:\/\/lotusarise.com\/qna\/upsc\/q-consider-the-following-statements-144","title":{"rendered":"Q. Consider the following statements :"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Statement-I :<\/strong>&nbsp;Giant stars live much longer than dwarf stars.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Statement-II<\/strong>&nbsp;: Compared to dwarf stars, giant stars have a greater rate of nuclear reactions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Which one of the following is correct in respect of the above statements?<\/p>\n\n\n\n<ul class=\"wp-block-list mcq\">\n<li>Both Statement-I and Statement-II are correct and Statement-II explains Statement-I<\/li>\n\n\n\n<li>Both Statement-I and Statement-II are correct, but Statement-II does not explain Statement-I<\/li>\n\n\n\n<li>Statement-I is correct, but Statement-II is incorrect<\/li>\n\n\n\n<li>Statement-I is incorrect, but Statement II is correct<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Answer:&nbsp;(d) Statement-I is incorrect, but Statement II is correct<\/strong><\/p>\n<\/blockquote>\n\n\n\n<h5 class=\"wp-block-heading\" id=\"notes\">Notes:<\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Giant stars do not live much longer than dwarf stars. In fact,\u00a0<strong>giant stars have shorter lifespans than dwarf stars<\/strong>. Giant stars,\u00a0<strong>due to their larger mass and higher core temperatures, burn through their nuclear fuel much more rapidly<\/strong>, leading to shorter lifespans.\n<ul class=\"wp-block-list\">\n<li><strong>Dwarf stars, especially red dwarfs, can have lifespans of tens to hundreds of billions of years<\/strong>, while giant stars typically live for millions to a few billion years.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Giant stars have a much higher rate of nuclear reactions compared to dwarf stars<\/strong>. This is\u00a0<strong>because they have larger masses and hotter, denser cores, which accelerate the fusion processes.<\/strong><\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Feature<\/th><th>Giant Stars<\/th><th>Dwarf Stars<\/th><\/tr><\/thead><tbody><tr><td><strong>Mass<\/strong><\/td><td>8-100 times the mass of the Sun<\/td><td>Less than 5 times the mass of the Sun<\/td><\/tr><tr><td><strong>Size<\/strong><\/td><td><strong>Much larger<\/strong>&nbsp;than the Sun (up to 1,000 times wider)<\/td><td>Smaller than the Sun<\/td><\/tr><tr><td><strong>Lifespan<\/strong><\/td><td><strong>Shorter,<\/strong>&nbsp;millions to a few billion years<\/td><td>Longer, tens to hundreds of billions of years<\/td><\/tr><tr><td><strong>Luminosity<\/strong><\/td><td><strong>Much brighter<\/strong>&nbsp;than the Sun<\/td><td>Dimmer than the Sun<\/td><\/tr><tr><td><strong>Core Temperature<\/strong><\/td><td>Higher than dwarf stars<\/td><td>Lower than giant stars<\/td><\/tr><tr><td><strong>Nuclear Reactions<\/strong><\/td><td><strong>Higher rate<\/strong>&nbsp;of nuclear reactions<\/td><td>Lower rate of nuclear reactions<\/td><\/tr><tr><td><strong>Evolutionary Path<\/strong><\/td><td><strong>Can become red giants or supergiants<\/strong>&nbsp;before ending as neutron stars or black holes<\/td><td>Typically become&nbsp;<strong>white dwarfs or red dwarfs<\/strong>&nbsp;after the main sequence<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><img decoding=\"async\" src=\"https:\/\/lotusarise.com\/wp-content\/uploads\/2025\/04\/Stellar-evolution-1024x649.webp\" alt=\"Stellar evolution\" class=\"wp-image-51778\" style=\"width:832px;height:auto\" title=\"UPSC Prelims Research: Science and Tech 2024 2\"\/><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Statement-I :&nbsp;Giant stars live much longer than dwarf stars. Statement-II&nbsp;: Compared to dwarf stars, giant stars have a greater rate of nuclear reactions. Which one of the following is correct in respect of the above statements? Answer:&nbsp;(d) Statement-I is incorrect, but Statement II is correct Notes: Feature Giant Stars Dwarf Stars Mass 8-100 times the&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[1,3],"tags":[44],"years":[49],"class_list":["post-2433","post","type-post","status-publish","format-standard","hentry","category-upsc","category-prelims","tag-science-and-tech","years-49"],"acf":[],"taxonomy_info":{"category":[{"value":1,"label":"UPSC"},{"value":3,"label":"Prelims"}],"post_tag":[{"value":44,"label":"Science and Tech"}],"years":[{"value":49,"label":"2024"}]},"featured_image_src_large":false,"author_info":{"display_name":"LotusArise","author_link":"https:\/\/lotusarise.com\/qna\/author\/team-lotusarise"},"comment_info":0,"category_info":[{"term_id":1,"name":"UPSC","slug":"upsc","term_group":0,"term_taxonomy_id":1,"taxonomy":"category","description":"","parent":0,"count":1269,"filter":"raw","cat_ID":1,"category_count":1269,"category_description":"","cat_name":"UPSC","category_nicename":"upsc","category_parent":0},{"term_id":3,"name":"Prelims","slug":"prelims","term_group":0,"term_taxonomy_id":3,"taxonomy":"category","description":"","parent":1,"count":1251,"filter":"raw","cat_ID":3,"category_count":1251,"category_description":"","cat_name":"Prelims","category_nicename":"prelims","category_parent":1}],"tag_info":[{"term_id":44,"name":"Science and Tech","slug":"science-and-tech","term_group":0,"term_taxonomy_id":44,"taxonomy":"post_tag","description":"","parent":0,"count":167,"filter":"raw"}],"_links":{"self":[{"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/posts\/2433","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/comments?post=2433"}],"version-history":[{"count":0,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/posts\/2433\/revisions"}],"wp:attachment":[{"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/media?parent=2433"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/categories?post=2433"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/tags?post=2433"},{"taxonomy":"years","embeddable":true,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/years?post=2433"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}