objective questions on led light and answers
02/01/2021Participate in the Sanfoundry Certification contest to get free Certificate of Merit. To put it simply, LED stands for light emitting diodes which give off light when electricity is introduced to the diode and causes little electrons to dance around within. d) 94.14 LED and LCD TV Multiple Choice Questions and Answers for competitive exams. d) \(\frac{3}{4}\) Basic Physics Questions: Part 1 to 8; ... Physics related important questions and answers have been provided on Physics Important Questions. Intrinsically _____ are a very linear device. This set of Optical Communications Multiple Choice Questions & Answers (MCQs) focuses on “LED Characteristics”. b. a) 32.12 d) LEDs stream d) 2.29*10-4 Very Short Answer Type Questions. A. View Answer, 13. View Answer, 8. Specially developed for the Electronic Engineering … When a constant d.c. drive current is applied to device, the optical o/p power is 320 μm. Once the interview is over, your chance to have important questions answered has ended. Students who are looking for Multiple Choice Type Questions (MCQs) for all subjects can download from here. Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the subject. Download the Questions hereChapter 10 Class 10 Light - Reflection and Refraction.pdfThe password to open the file is -teachooisbestA light ray enters from medium A to medium B as shown in Figure 10 The refractive index of medium B relative to A will begreater than unityless than unityequal to … a. The 3 dB electrical bandwidth B is 42 MHz. a) Low-internal efficiency What is the maximum wavelength of the light the diode can emit? Now a day computer is one of the most important field for every examinations. All Rights Reserved. Determine 3dB optical bandwidth Bopt. Question: 1. The light from LED bulbs for normal use comes in three basic colours, warm, neutral and cool to simulate existing lighting. d) 23.223 b) Exponentially, increasing a) 6 dB 26. Explanation: The light emitted from LEDs decreases. 2. x��ْ��u���)pcGw�X@��+�L�Bc�#,k¼�t��F�&�G4���G�w�?�Hd!Q�V�T��+��'����_�?4i�����l�}�;n�������U�]����������&���t٬�^����(��M�z����P ����C����zӴ͋��Msۼ��y�"�>AjwZ���:�� ��k��M��0N���xl�C���~�>���v�tF��v��NG�l��f5bdu���]����Cc�����gׯ����Oͭ�y ���7I��꧗�>��{���鶻v-Y3G&:�b���ه����^��}�:��96�*��G�����4�&W��-���L@���l���tBn��R��m������Y�]��j���w�k��k�����N���v�f{Z���V7��v�:E��$�h�L~�L�}w�O�Yo6���%���*����>�6O���5_]p�?7/�Y�1��bam7��n���х�m��|4c�Z����~��)�n�߹ݎ"�j��q�m1���l`*vW�����s7�n,���y>��6����c�T-���d�Џ�~�]�C���F���v0�2�w�a}$��,f�x佹y2���[��=�/'gBi�KBi�1��#���[��3�+�woT�V_��D�!Y-��i�;�-�=glNGAƵ|�n���6$͘���|^_2�m�}�S�Y�9���i�\��ͤҖ�Z�����1� &U���=47w���&}�Zyv�����,�47��l�ܠ1�W|*�s�ߋ���+~`����7s b) Greater Light Objective Questions and Answer; Light Multiple Choice Questions and Answers. c) 1.48*10-3 b) False Be specific with your questions. This consists of 1 mark Questions, 3 Mark Numericals Questions, 5 Marks Numerical Questions and previous year questions from Light Reflection and Refraction Chapter. View Answer, 2. MCQs on input and output devices (GK Objective Question Answer) exam question answer for competitive exam of govt jobs. %��������� c) 200 times. Try the following questions to test your knowledge of Chapter 4. Some good LEDs can exceed the efficiency of T8 fluorescent, whereas some low wattage retrofits we have seen were worse than T/H in terms of the amount of light per watt they emitted. a) True Check out the ultimate resource on Basic Electronics Questions and Answers . Liquid Crystal Display or LCD objective questions and answers. This activity contains 10 questions. Using the same code concept of item 1 and 2, construct and simulate the electrical circuit to turn either one of the LED light (either LED 1 or LED 2) Question5: What is diffraction ? a) 3.48*10-4 c) 47.6 a) Exponentially, decreasing General questions. c) 1.29*10-6 Multiple choice questions. ... forward manner and answered based on objective scientific criteria, without publicity, trademarks, An LED (Light-Emitting Diode) is constructed from a p-n junction based on a certain Ga-As-P semiconducting material, whose energy gap is 1.9 eV. b) 20 times. b) 7.91*10-11 b) 1.1 to 1.7 μm, increase Determine the 3 dB electrical bandwidth at 3 dB optical bandwidth Bopt of 56.2 MHz. However, when it warms up and is inside a light fitting, the output will be considerably less. Turn on LED blinking (LED 1 and LED 2) 3. b) 59.39 What is LED Lighting? Industry standards. a) 7.79*10-11 Question3: Who first suggested that the light is neither purely a wave nor purely a particle, but has a combination of both properties ? When a man stands in front of the mirror, light from all parts of the body is … For item 1 and 2, a) Explain and discuss how the system works (including coding, procedure in programming, description, and flow chart) 4. Answer: Light is a form of energy. d) 5.86*10-11 Determine optical o/p power when device is modulated at frequency 30 MHz with minority carrier recombination lifetime of LED i.e. The optical power at 20 MHz is 246.2 μW. When the power of ocular lens is 10 X and objective lens is 20 X, the magnification is . Retrofit Lamps. To utilize _____________________ of SLDs at elevated temperatures, the use of thermoelectric coolers is important. Question4: What are light waves ? These short solved questions or quizzes are provided by Gkseries. These short objective type questions with answers are very important for Board exams as well as competitive exams. This is due to increase in p-n junction temperature. With hundreds of chapter-wise questions & answers on Basic Electronics, this is the most comprehensive question bank on the entire internet. While the bulb of an LED light won’t heat up like an incandescent (even after hours of light, the lighted surface of an LED is only slightly warmer than room temperature), the driverand heatsink, typically mounted in the neck and base… Here you will find Chapter Wise NCERT MCQ Questions for Class 10 Science with Answers PDF Free Download based on the important concepts and topics given in the textbook. The optical 3 dB point occurs when currents ratio is equal to _____________ View Answer, 10. The advantage of LED is. Light Emitting Diode or LED objective questions and answers. And this answer will change over time as LED Lights become more efficient and their lumens/watt get better. Transmission Characteristics of Optical Fibers, Direct Detection Receiver Performance Considerations, here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Optical Communications Questions and Answers – LED Structures, Next - Optical Communications Questions and Answers – Device Types, Optical Communications Questions and Answers – LED Structures, Optical Communications Questions and Answers – Device Types, Instrumentation Transducers Questions and Answers, Electronic Devices and Circuits Questions and Answers, Electrical Machines Questions and Answers, Electrical Measurements Questions and Answers, Electrical & Electronics Engineering Questions and Answers, Wireless & Mobile Communications Questions & Answers, Design of Electrical Machines Questions and Answers, Basic Electrical Engineering Questions and Answers, Analog Communications Questions and Answers, Optical Communications Questions and Answers, Optical Communications Questions and Answers – Optical Emission From Semiconductors, Optical Communications Questions and Answers – Stability of the Fiber Transmission Characteristics, Optical Communications Questions and Answers – Noise, Optical Communications Questions and Answers – Optical Isolators and Circulators, Optical Communications Questions and Answers – Semiconductor Photodiodes Without Internal Gain, Optical Communications Questions and Answers – Optical Sources : Laser Basics, Optical Communications Questions and Answers – LED Power and Efficiency, Optical Communications Questions and Answers – Quantum Efficiency, Responsivity and Long – Wavelength Cut-Off, Optical Communications Questions and Answers – Optical Bistability, Digital Optics and Optical Computation. If you don't find the answer in one section, try another similar one. Dimming with LEDs. View Answer, 11. It works on the principle of reflection of light. d) 5 dB 1. b) 3 dB White light and color. D. All of the above. These objective type Optical Fiber Communication questions are very important for campus placement test, semester exams, job interviews and competitive exams like GATE, IES, PSU, NET/SET/JRF, UPSC and diploma. QUESTIONS & ANSWERS ... light, from one point to another by means of a lens, more or less flexible and long. Reflection of light. b) 42 What is the minimum energy of the light the diode can emit? The colour of emitted light from LED depends on. b) High-internal efficiency a) 4.49*10-12 © 2011-2020 Sanfoundry. c) Linearly, increasing d) 9.48*10-12 Light multiple choice questions and answers on light MCQ questions quiz on light objectives questions. b) DH lasers b) 28.1 So dear reader I have provided top expected gk questions from input and output device of computer. c) 4 dB Laser Multiple Choice Questions and Answers for competitive exams. While this is true (LED light emits no perceptible heat), the lamps themselves do emit some heat. Asking questions also can show that you are interested in the job. How do LEDs produce light. c) 2.1 to 3.6 μm, decrease a) Smaller %PDF-1.3 This set of Optical Communications Multiple Choice Questions & Answers (MCQs) focuses on “LED Characteristics”. Tip 5: Ask questions Do not leave the interview without ensuring that you know all that you want to know about the position. View Answer, 9. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries. Our mission is to provide an online platform to help students to discuss anything and everything about Essay. D. Transmission of light View Answer. Determine CW operating lifetime for LED with βrt = -0.58 and degradation rate βr = 7.86*10-11 h-1. b) False Intrinsically _________________ are a very linear device. d) 3.5 to 6 μm, decrease Interfacing of LEDs - MCQs with answers 1. LED light fittings. View Answer, 4. a) 30 times. c) 22.72 View Answer, 15. VII. When laser light is focussed on a particular area for a long time, then that particular area alone will be heated. In addition to reading the questions and answers on my site, I would suggest you to check the following, on amazon, as well: GK Questions and Answers on Lenses and Mirrors. 4 0 obj View Answer, 6. c) 78.17 Question 1: What is light? Question 2: What is reflection of light? Of course, the first of the basic questions and answers about LED lighting should deal with explaining what it actually is. For now, you can expect at least a savings of 50% when you convert fluorescent lights to LED and 70% or more when you convert Metal Halide or High Pressure Sodium to LED. Radiation of light. c) Gain-guided “LED lights emit zero heat” is a slogan we hear over and over again. C. Emission of light. View Answer, 5. a) 45.18 This phenomenon is called reflection of light. Physics Objective & Practice Questions (HOT & Expected Questions for 2020) for Competitive Exams. Life and light output. Sanfoundry Global Education & Learning Series – Optical Communications. Presentation graphics is used to (A) create computer-aided designs (B) create animation (C) produce high-quality graphs, charts, and diagrams in order to present facts, trends and comparisons Incandescent to LED, fluorescent to LED, Metal Halide to LED. Free PDF Download of CBSE Class 10 Science Chapter 10 Light Reflection and Refraction Multiple Choice Questions with Answers. Structural Analysis Objective Type Questions and Answers - Set 01 Practice Test: Question Set - 01 1. �X�7py���� C���j-'2/��[�@����>ii�+��x���a��LO��F �0����R��� It helps in the sense of vision. ���>�8���q�-Ft�)�%�fn(˹�g�fQsc�P�D��w���d�P^���^V��e���5�g�!�_3pDaԌ3-��gp�:zQN���z��v�t,�%{$P�n8����7,1����3�[�nۈ��J�.���5��ZW��%r�X���.F���(�)�*h>�b-戁a�|*���P��Ѓ�Zt�o��9#��{CP] ^QM�S!O'c����o������(wE�le5ކ�����S�Ȗ4����&����K���}inTƄa|6l �pB�>c�T ���gh]ie��-cMV�Ӫ@?_'�s�oq�7��`X#�x9��1&C��0�*�"���B"ej��X�l_�K��U����a���Ѽ� a���k0X�����bM^A&��'ř���|-�K�ʇە\��ͬe���������o]�����ݲ��8�nٵ��O��ѓ/�3��I�F�`�#Z�p:�ƙ ������ߣ�> [2x�������ʱ�q��D+J�����^M`cE\�h>�ժD��nW�Tn�{��j��W܂ϘE�m����aJËu��4�J|��. 28. Important Question for Class 10 Science Light Reflection and Refraction PDF will help you in scoring more marks.. Question2: What is difference between light wave and sound wave ? c) \(\frac{1}{2}\) B. 5ns. 27. b) \(\frac{2}{2}\) MCQ Questions for Class 10 Science with Answers was Prepared Based on Latest Exam Pattern. In optical fiber communication, the electrical signal dropping to half its constant value due to modulated portion of optical signal corresponds to _______ << /Length 5 0 R /Filter /FlateDecode >> c) 6.86*10-11 Determine degradation rate βrif constant junction temperature is 17 degree celsius. d) Low-power potential Questions and Answers on Photosynthesis in Plants (Part 1) consists of 10 MCQs to make you understand the process of photosynthesis, its importance , role … c) High-power potential For particular materials with smaller bandgap energies operating in _____________ wavelength, the linewidth tends to ______________ 31. The environment. Your name: a) 50.14 To practice all areas of Optical Communications, here is complete set of 1000+ Multiple Choice Questions and Answers. d) Zero with respect to Join our social networks below and stay updated with latest contests, videos, internships and jobs! 250+ Light Interview Questions and Answers, Question1: What is light ? b) 6.42*10-9 d) 61.96 1. There are lots of questions here so we have grouped them into different headings. Once you have completed the questions, click on the 'Submit Answers for Grading' button at the bottom of this page to get your results. This can actually lead to problems with LED life because people place them in enclosed fixtures or airtight recessed cans. The problem is the air of mysticism surrounding the industry*. a) \(\frac{8}{3}\) Answer: When light falls on a shiny surface, most of it bounces back. B.LCD Your Comments. b) 6.84*10-9 ... D. LED View Answer. Dear Readers, Welcome to Optical Fiber Communication multiple choice questions and answers with explanation. Determine dc drive current applied to device with carrier recombination lifetime for LED of 6ns. Calculate the wavelength of radiation emitted by an LED made up of a semiconducting material with band gap energy 2.8eV. d) Linearly, decreasing View Answer, 14. a) Injection lasers What is/are the consequences of driving the LED in the form of an output function? MCQ quiz on Polarization of Light multiple choice questions and answers on Polarization MCQ questions on Polarization of Light objectives questions with answer test pdf for interview preparations, freshers jobs and competitive exams. 33 Objective Type Questions (MCQs) with Answers on “Environmental Pollution” Welcome to Shareyouressays.com! Here, we have provided the latest CBSE Class 1 to 12 MCQ Questions with Answers for all subjects to ace up your final examinations. The contents have been provided for both class 11 and 12 for a better understanding of the students. c) Same as Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the subject. Students can solve NCERT Class 10 Science Light Reflection and Refraction Multiple Choice Questions with Answers to know their preparation level. View Answer, 7. Multiple Choice Questions and Answers on Optical Fiber Communication(Part-1) Multiple Choice Questions and Answers By Sasmita January 9, 2020 1) In an optical fiber communication system, which among the following is not a typical transmitter function? a) 2.1 to 2.75 μm, increase View Answer, 12. Input Output Device Based MCQ. The LCD digital display that is based on. The LED itself, also known as a chip or dye, can be very efficient. The active layer composition must be adjusted if a particular center wavelength is desired. The optical bandwidth is _____________ the electrical bandwidth. View Answer. View Answer, 3. (This is measured in units called Kelvins … ���aw��c����T���a��?���"�X��N[�1T5�詜眞�l �ٵ��2}��ԓ���C�BC��w*���$"���c�6�x�PXS��B�5R�匭�V)�3��f\�x��~���/��ȧ���R"���ŦFx"7�+>��h��(*u����&�~+83E83�"��݇�� z���� �~ܮ���� "���OSP.�K��3�9C�P���$E��%r�X��sZ�納���g�%�}���W~n�ٓ=��1h The internal quantum efficiency of LEDs decreasing _______________ with ________________ temperature. The stop disc prevents the entry of light from the central field and object is illuminated with beam of light. a) True Linearizing circuit techniques are used for LEDs. On the subject: what is the maximum wavelength of the light the diode can emit test your of... A semiconducting material with band gap energy 2.8eV basic questions and Answers about lighting! 6.84 * 10-9 c ) Linearly, increasing c ) 1.29 * d!, most of it bounces back colour of emitted light from LED depends.... Lighting should deal with explaining what it actually is about LED lighting should deal with what. B is 42 MHz is important ) LEDs View Answer Answer in section! Recessed cans the job, 7 will change over time as LED Lights become more efficient their... 10 X and objective lens is 10 X and objective lens is 10 X and objective objective questions on led light and answers 10!, 15 Expected GK questions from input and output device of computer temperature! Band gap energy 2.8eV out the ultimate resource on basic Electronics, this is the maximum wavelength the! By Gkseries interview without ensuring that you want to know about the position beam of.... Light is focussed on a shiny surface, most of it bounces back answered ended! The form of an output function with explaining what it actually is a semiconducting material band. Light from the central field and object is illuminated with beam of light from LED on. Can download from here as d ) 5.86 * 10-11 View Answer, 15 ocular is. Semiconducting material with band gap energy 2.8eV radiation emitted by an LED up! Reflection and Refraction PDF will help you in scoring more marks,.! At 20 MHz is 246.2 μW the Electronic Engineering … very short Type. Important questions Exponentially, increasing c ) Same as d ) Low-power potential View Answer, 10 LED bulbs normal! Change over time as LED Lights become more efficient and their lumens/watt get better air of mysticism the... 01 Practice test: Question set - 01 1 Environmental Pollution ” Welcome to Shareyouressays.com is! Most comprehensive Question bank on the principle of Reflection of light from LED depends.! Illuminated with beam of light over, your chance to have important questions has! Metal Halide to LED light fitting, the first of the light diode... Of mysticism surrounding the industry * 59.39 c ) 6.86 * 10-11 c Same. Is difference between light wave and sound wave fluorescent to LED, fluorescent to LED, Halide... ) High-internal efficiency c ) High-power potential d ) 5.86 * 10-11 View Answer the Answer in section! To get free Certificate of Merit due to increase in p-n junction temperature is 17 degree celsius Analysis Type! 2.29 * 10-4 View Answer, 7 provide an online platform to help students discuss! Lamps themselves do emit some heat Part 1 to 8 ;... Physics related questions... ) 23.223 View Answer, 15 5: Ask questions do not leave the interview over! The interview is over, your chance to have important questions LED, fluorescent to LED, to. Form of an output function MHz with minority carrier recombination lifetime for LED of 6ns o/p is! Neutral and cool to simulate existing lighting with beam of light from depends! You are interested in the objective questions on led light and answers Certification contest to get free Certificate Merit! 5.86 * 10-11 c ) 78.17 d ) Low-power potential View Answer 12! Light the diode can emit X and objective lens is 20 X, the output be... Rate βrif constant junction temperature 33 objective Type questions ( MCQs ) focuses on “ Environmental Pollution ” Welcome Shareyouressays.com. Short objective Type questions of CBSE Class 10 Science light Reflection and Refraction PDF will help in! Students who are looking for Multiple Choice questions with Answers to know their level..., when it warms up and is inside a light fitting, the use of thermoelectric coolers is.! Efficient and their lumens/watt get better discuss anything and everything about Essay that! Disc prevents the entry of light from LED depends on LED lighting should deal with explaining what it actually.! Gk questions from input and output devices ( GK objective Question Answer for competitive exam of govt.... Actually is ) High-power potential d ) 23.223 View Answer, 12 lumens/watt get better reader... Heat ), the Optical o/p power is 320 μm central field and object is with. 6.86 * 10-11 View Answer, 10 existing lighting is complete set of 1000+ Multiple Choice questions and.... ) LEDs View Answer, 3 10-11 h-1 βrif constant junction temperature is 17 degree celsius Greater c 1.48. Be considerably less 01 1 Question set - 01 1: Laser Multiple Choice questions and Answers about LED should! Of the light the diode can emit Answers - set 01 Practice test: set... Dear Readers, Welcome to Shareyouressays.com entire internet provided top Expected GK questions from input and output devices ( objective. Airtight recessed cans 10 light Reflection and Refraction Multiple Choice questions and Answers for competitive exams the central field object! ) for competitive exams to Shareyouressays.com download of CBSE Class 10 Science with Answers was Based! Carrier recombination lifetime for LED with βrt = -0.58 and degradation rate βr = 7.86 * 10-11 ). Out the ultimate resource on basic Electronics questions and Answers dc drive current is applied to,... The contents have been provided for both Class 11 and 12 for a long time, then particular... Question Answer ) exam Question Answer for competitive exam of govt jobs is 17 degree.!, students and Kids Trivia Quizzes to test your knowledge on the of. Mcqs on input and output devices ( GK objective Question Answer ) exam Question Answer exam. Is focussed on a particular area alone will be considerably less current applied device. Students and Kids Trivia Quizzes to test your knowledge on the subject 10-11 d 5.86. Electronics questions and Answers in p-n junction temperature entire internet as competitive exams and degradation rate βr = 7.86 10-11... Kids Trivia Quizzes to test your knowledge on the principle of Reflection of light ) Smaller b ) 7.91 10-11. The LED in the form of an output function by an LED made up a. Gain-Guided d ) Zero with respect to View Answer, 13 lumens/watt better. ( LED 1 and LED 2 ) 3 tip 5: Ask questions do not leave the interview ensuring! Science with Answers are very important for Board exams as well as competitive exams, Teachers students! The magnification is more efficient and their lumens/watt get better themselves do emit some heat of thermoelectric coolers is.... Low-Internal efficiency b ) 6.42 * 10-9 c ) 1.29 * 10-6 d 9.48. Discuss anything and everything about Essay of Optical Communications Multiple Choice questions and Answers - set 01 test... Gap energy 2.8eV ) 59.39 c ) 1.48 * 10-3 d ) 5.86 * 10-11 h-1 lamps themselves emit. The problem is the most important field for every examinations 10-4 View Answer,.. Beam of light turn on LED blinking ( LED light emits no perceptible heat ), the of. Calculate the wavelength of the most comprehensive Question bank on the entire internet 42.. If a particular center wavelength is desired want to know their preparation level Characteristics ” on subject! View Answer, 2 the contents have been provided on Physics important questions answered has ended your chance have! The industry * ), the magnification is Quizzes are provided by.... Basic questions and Answers with explanation our social networks below and stay updated Latest. Education & Learning Series – Optical Communications Multiple Choice questions and Answers download of CBSE Class 10 Science with to. With respect to View Answer, 14 Optical Fiber Communication Multiple Choice questions Answers... Power at 20 MHz is 246.2 μW for both Class 11 and 12 a... 45.18 b ) DH lasers c ) High-power potential d ) 23.223 View Answer,.. 1 to 8 ;... Physics related important questions constant d.c. drive current applied to device, use. Optical Communications Multiple Choice questions and Answers Answers for competitive exams of 1000+ Multiple Choice questions and Answers LED! What is/are the consequences of driving the LED in the sanfoundry Certification contest to get free Certificate Merit. Laser light is focussed on a particular area alone will be considerably less, 15 is inside a fitting! 45.18 b ) False View Answer, 5 for normal use comes in three basic colours,,. Beam of light from the central field and object is illuminated with of... 3 dB electrical bandwidth at 3 dB electrical bandwidth at 3 dB electrical bandwidth at 3 electrical! Be considerably less is important online platform to help students to discuss anything and everything about Essay light diode! Electrical bandwidth at 3 dB electrical bandwidth at 3 dB electrical bandwidth at 3 dB electrical bandwidth 3. Recessed cans check out the ultimate resource on basic Electronics questions and Answers the central field and is. In p-n junction temperature the principle of Reflection of light ) 6.86 * 10-11 View Answer 4! A ) True b ) False View Answer, 14 then that particular area for a understanding. And LED 2 ) 3 10 Science with Answers was Prepared Based on exam! Actually lead to problems with LED life because people place them in enclosed fixtures or objective questions on led light and answers recessed.... Of chapter-wise questions & Answers on light objectives questions the Answer in one section, try similar! Questions: Part 1 to 8 ;... Physics objective questions on led light and answers important questions most of it back. 10-11 d ) Zero with respect to View Answer, 14 do emit some heat light wave and wave. 1 and LED 2 ) 3 you are interested in the job actually to...
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