{"id":87599,"date":"2025-06-01T06:48:31","date_gmt":"2025-06-01T06:48:31","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=87599"},"modified":"2025-06-01T06:48:31","modified_gmt":"2025-06-01T06:48:31","slug":"light-year-is-a-unit-for-measurement-of","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/light-year-is-a-unit-for-measurement-of\/","title":{"rendered":"Light year is a unit for measurement of"},"content":{"rendered":"

Light year is a unit for measurement of<\/p>\n

[amp_mcq option1=”age of universe” option2=”very small time intervals” option3=”very high temperature” option4=”very large distance” correct=”option4″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-1 – 2018<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe correct answer is D.
\n<\/section>\n
\nA light-year is defined as the distance that light travels in vacuum in one Julian year (365.25 days). Since the speed of light is constant and very high, a light-year represents a very large distance. It is commonly used in astronomy to measure the distances between celestial objects, such as stars and galaxies. It is not a unit of time, temperature, or a measure related to the age of the universe (although the size of the observable universe is often expressed in light-years, its age is in years).
\n<\/section>\n
\nOne light-year is approximately 9.461 trillion kilometers (5.879 trillion miles). Other units for measuring astronomical distances include the Astronomical Unit (AU) and the Parsec.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Light year is a unit for measurement of [amp_mcq option1=”age of universe” option2=”very small time intervals” option3=”very high temperature” option4=”very large distance” correct=”option4″] This question was previously asked in UPSC NDA-1 – 2018 Download PDFAttempt Online The correct answer is D. A light-year is defined as the distance that light travels in vacuum in one … <\/p>\n

Detailed SolutionLight year is a unit for measurement of<\/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":[1114,1140,1128],"class_list":["post-87599","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-1","tag-1114","tag-measurement-unit","tag-physics","no-featured-image-padding"],"yoast_head":"\nLight year is a unit for measurement of<\/title>\n<meta name=\"description\" content=\"The correct answer is D. A light-year is defined as the distance that light travels in vacuum in one Julian year (365.25 days). Since the speed of light is constant and very high, a light-year represents a very large distance. It is commonly used in astronomy to measure the distances between celestial objects, such as stars and galaxies. It is not a unit of time, temperature, or a measure related to the age of the universe (although the size of the observable universe is often expressed in light-years, its age is in years).\" \/>\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\/light-year-is-a-unit-for-measurement-of\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Light year is a unit for measurement of\" \/>\n<meta property=\"og:description\" content=\"The correct answer is D. A light-year is defined as the distance that light travels in vacuum in one Julian year (365.25 days). Since the speed of light is constant and very high, a light-year represents a very large distance. It is commonly used in astronomy to measure the distances between celestial objects, such as stars and galaxies. 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