{"id":85809,"date":"2025-06-01T03:28:35","date_gmt":"2025-06-01T03:28:35","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=85809"},"modified":"2025-06-01T03:28:35","modified_gmt":"2025-06-01T03:28:35","slug":"which-one-of-the-following-does-not-convert-electrical-energy-into-l","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-does-not-convert-electrical-energy-into-l\/","title":{"rendered":"Which one of the following does not convert electrical energy into l"},"content":{"rendered":"

Which one of the following does not<\/b> convert electrical energy into light energy?<\/p>\n

[amp_mcq option1=”A candle” option2=”A light-emitting diode” option3=”A laser” option4=”A television set” correct=”option1″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CDS-2 – 2018<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe question asks which option does *not* convert electrical energy into light energy.
\nA) A candle: A candle produces light through the process of combustion, where chemical energy stored in the wax is converted into heat and light energy. It does not use electrical energy.
\nB) A light-emitting diode (LED): LEDs are semiconductor devices that convert electrical energy directly into light through electroluminescence.
\nC) A laser: Lasers produce light through stimulated emission. Many types of lasers, particularly semiconductor lasers, are powered by electrical energy. Other lasers may be powered by optical energy, but the principle is often related to electrical excitation or pumping.
\nD) A television set: A television set’s display screen (whether CRT, LCD, LED, or Plasma) converts electrical energy into light to form images.
\nTherefore, a candle is the only option that does not convert electrical energy into light energy.
\n<\/section>\n
\n– Identify the energy conversion process in each device.
\n– Electrical energy to light energy conversion is the key process to look for.
\n– Understand the working principle of each listed item.
\n<\/section>\n
\nIncandescent bulbs, fluorescent lamps, and gas discharge lamps are other common examples of devices that convert electrical energy into light energy. Photosynthesis in plants converts light energy into chemical energy.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following does not convert electrical energy into light energy? [amp_mcq option1=”A candle” option2=”A light-emitting diode” option3=”A laser” option4=”A television set” correct=”option1″] This question was previously asked in UPSC CDS-2 – 2018 Download PDFAttempt Online The question asks which option does *not* convert electrical energy into light energy. A) A candle: A … <\/p>\n

Detailed SolutionWhich one of the following does not convert electrical energy into l<\/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":[1088],"tags":[1114,1201,1128],"class_list":["post-85809","post","type-post","status-publish","format-standard","hentry","category-upsc-cds-2","tag-1114","tag-electric-current","tag-physics","no-featured-image-padding"],"yoast_head":"\nWhich one of the following does not convert electrical energy into l<\/title>\n<meta name=\"description\" content=\"The question asks which option does *not* convert electrical energy into light energy. A) A candle: A candle produces light through the process of combustion, where chemical energy stored in the wax is converted into heat and light energy. It does not use electrical energy. B) A light-emitting diode (LED): LEDs are semiconductor devices that convert electrical energy directly into light through electroluminescence. C) A laser: Lasers produce light through stimulated emission. Many types of lasers, particularly semiconductor lasers, are powered by electrical energy. Other lasers may be powered by optical energy, but the principle is often related to electrical excitation or pumping. D) A television set: A television set's display screen (whether CRT, LCD, LED, or Plasma) converts electrical energy into light to form images. Therefore, a candle is the only option that does not convert electrical energy into light energy. - Identify the energy conversion process in each device. - Electrical energy to light energy conversion is the key process to look for. - Understand the working principle of each listed item.\" \/>\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-does-not-convert-electrical-energy-into-l\/\" \/>\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 does not convert electrical energy into l\" \/>\n<meta property=\"og:description\" content=\"The question asks which option does *not* convert electrical energy into light energy. A) A candle: A candle produces light through the process of combustion, where chemical energy stored in the wax is converted into heat and light energy. It does not use electrical energy. B) A light-emitting diode (LED): LEDs are semiconductor devices that convert electrical energy directly into light through electroluminescence. C) A laser: Lasers produce light through stimulated emission. Many types of lasers, particularly semiconductor lasers, are powered by electrical energy. Other lasers may be powered by optical energy, but the principle is often related to electrical excitation or pumping. D) A television set: A television set's display screen (whether CRT, LCD, LED, or Plasma) converts electrical energy into light to form images. Therefore, a candle is the only option that does not convert electrical energy into light energy. - Identify the energy conversion process in each device. - Electrical energy to light energy conversion is the key process to look for. - Understand the working principle of each listed item.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-does-not-convert-electrical-energy-into-l\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T03:28:35+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":"Which one of the following does not convert electrical energy into l","description":"The question asks which option does *not* convert electrical energy into light energy. 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