a) Low-internal efficiency MCQs on input and output devices (GK Objective Question Answer) exam question answer for competitive exam of govt jobs. a) 4.49*10-12 These short solved questions or quizzes are provided by Gkseries. 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… To practice all areas of Optical Communications, here is complete set of 1000+ Multiple Choice Questions and Answers. It helps in the sense of vision. View Answer, 5. Your name: Determine dc drive current applied to device with carrier recombination lifetime for LED of 6ns. If you don't find the answer in one section, try another similar one. What is the maximum wavelength of the light the diode can emit? Students can solve NCERT Class 10 Science Light Reflection and Refraction Multiple Choice Questions with Answers to know their preparation level. LED light fittings. The optical 3 dB point occurs when currents ratio is equal to _____________ b. 28. Determine degradation rate βrif constant junction temperature is 17 degree celsius. Basic Physics Questions: Part 1 to 8; ... Physics related important questions and answers have been provided on Physics Important Questions. b) 1.1 to 1.7 μm, increase D. Transmission of light View Answer. View Answer, 15. Answer: Light is a form of energy. B.LCD Your Comments. White light and color. 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. Asking questions also can show that you are interested in the job. d) Low-power potential Tip 5: Ask questions Do not leave the interview without ensuring that you know all that you want to know about the position. What is the minimum energy of the light the diode can emit? The stop disc prevents the entry of light from the central field and object is illuminated with beam of light. However, when it warms up and is inside a light fitting, the output will be considerably less. In addition to reading the questions and answers on my site, I would suggest you to check the following, on amazon, as well: d) 3.5 to 6 μm, decrease View Answer, 6. Turn on LED blinking (LED 1 and LED 2) 3. This set of Optical Communications Multiple Choice Questions & Answers (MCQs) focuses on “LED Characteristics”. 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. Question 2: What is reflection of light? When a man stands in front of the mirror, light from all parts of the body is … d) 5.86*10-11 The internal quantum efficiency of LEDs decreasing _______________ with ________________ temperature. Students who are looking for Multiple Choice Type Questions (MCQs) for all subjects can download from here. View Answer, 3. The light from LED bulbs for normal use comes in three basic colours, warm, neutral and cool to simulate existing lighting. GK Questions and Answers on Lenses and Mirrors. Now a day computer is one of the most important field for every examinations. With hundreds of chapter-wise questions & answers on Basic Electronics, this is the most comprehensive question bank on the entire internet. ���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 Industry standards. a) True View Answer, 14. d) LEDs View Answer, 13. 1. VII. Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the subject. ... forward manner and answered based on objective scientific criteria, without publicity, trademarks, Join our social networks below and stay updated with latest contests, videos, internships and jobs! b) Exponentially, increasing Questions and Answers on Photosynthesis in Plants (Part 1) consists of 10 MCQs to make you understand the process of photosynthesis, its importance , role … (This is measured in units called Kelvins … c) 1.48*10-3 a) 7.79*10-11 Radiation of light. Once you have completed the questions, click on the 'Submit Answers for Grading' button at the bottom of this page to get your results. a) True c) 200 times. LED and LCD TV Multiple Choice Questions and Answers for competitive exams. b) 28.1 33 Objective Type Questions (MCQs) with Answers on “Environmental Pollution” Welcome to Shareyouressays.com! c) 2.1 to 3.6 μm, decrease 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 … 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. ���>�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���}in”TƄa|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|��. In optical fiber communication, the electrical signal dropping to half its constant value due to modulated portion of optical signal corresponds to _______ a) Exponentially, decreasing d) Zero with respect to Question3: Who first suggested that the light is neither purely a wave nor purely a particle, but has a combination of both properties ? 26. 31. Intrinsically _____ are a very linear device. c) \(\frac{1}{2}\) What is/are the consequences of driving the LED in the form of an output function? 2. Very Short Answer Type Questions. a) Injection lasers 4 0 obj The optical power at 20 MHz is 246.2 μW. b) Greater b) DH lasers Try the following questions to test your knowledge of Chapter 4. Determine the 3 dB electrical bandwidth at 3 dB optical bandwidth Bopt of 56.2 MHz. c) Linearly, increasing 1. d) 94.14 b) 59.39 All these CBSE Class 10 Science MCQs Multiple Choice Questions with Answers provided here with detailed solutions so that you can easily understand the logic behind each answer. c) 47.6 The optical bandwidth is _____________ the electrical bandwidth. 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. c) Same as d) 9.48*10-12 Determine 3dB optical bandwidth Bopt. View Answer, 2. Structural Analysis Objective Type Questions and Answers - Set 01 Practice Test: Question Set - 01 1. B. The advantage of LED is. Calculate the wavelength of radiation emitted by an LED made up of a semiconducting material with band gap energy 2.8eV. When the power of ocular lens is 10 X and objective lens is 20 X, the magnification is . a) 6 dB And this answer will change over time as LED Lights become more efficient and their lumens/watt get better. What is LED Lighting? Once the interview is over, your chance to have important questions answered has ended. c) 78.17 View Answer, 4. D. All of the above. When a constant d.c. drive current is applied to device, the optical o/p power is 320 μm. QUESTIONS & ANSWERS ... light, from one point to another by means of a lens, more or less flexible and long. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. These short solved questions or quizzes are provided by Gkseries. The LCD digital display that is based on. Incandescent to LED, fluorescent to LED, Metal Halide to LED. ... D. LED View Answer. Important Question for Class 10 Science Light Reflection and Refraction PDF will help you in scoring more marks.. Interfacing of LEDs - MCQs with answers 1. b) \(\frac{2}{2}\) 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. These short objective type questions with answers are very important for Board exams as well as competitive exams. Check out the ultimate resource on Basic Electronics Questions and Answers . Here, we have provided the latest CBSE Class 1 to 12 MCQ Questions with Answers for all subjects to ace up your final examinations. 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 contents have been provided for both class 11 and 12 for a better understanding of the students. The active layer composition must be adjusted if a particular center wavelength is desired. c) 22.72 b) False How do LEDs produce light. Reflection of light. View Answer. “LED lights emit zero heat” is a slogan we hear over and over again. << /Length 5 0 R /Filter /FlateDecode >> d) 2.29*10-4 b) False c) Gain-guided When laser light is focussed on a particular area for a long time, then that particular area alone will be heated. d) 23.223 Retrofit Lamps. b) 6.42*10-9 a) 32.12 © 2011-2020 Sanfoundry. Question4: What are light waves ? a) 3.48*10-4 a) 50.14 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 d) 61.96 Light Emitting Diode or LED objective questions and answers. So dear reader I have provided top expected gk questions from input and output device of computer. a) 45.18 The 3 dB electrical bandwidth B is 42 MHz. All Rights Reserved. MCQ Questions for Class 10 Science with Answers was Prepared Based on Latest Exam Pattern. stream Light Objective Questions and Answer; Light Multiple Choice Questions and Answers. Determine CW operating lifetime for LED with βrt = -0.58 and degradation rate βr = 7.86*10-11 h-1. There are lots of questions here so we have grouped them into different headings. View Answer, 11. This activity contains 10 questions. b) 20 times. Multiple choice questions. 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. The colour of emitted light from LED depends on. These short objective type questions with answers are very important for Board exams as well as competitive exams. View Answer, 9. a) 30 times. Explanation: The light emitted from LEDs decreases. 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. 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. Be specific with your questions. Liquid Crystal Display or LCD objective questions and answers. For particular materials with smaller bandgap energies operating in _____________ wavelength, the linewidth tends to ______________ This phenomenon is called reflection of light. c) 1.29*10-6 a) 2.1 to 2.75 μm, increase b) 42 Determine optical o/p power when device is modulated at frequency 30 MHz with minority carrier recombination lifetime of LED i.e. d) Linearly, decreasing d) \(\frac{3}{4}\) 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 Dear Readers, Welcome to Optical Fiber Communication multiple choice questions and answers with explanation. b) 7.91*10-11 Question2: What is difference between light wave and sound wave ? Dimming with LEDs. Question: 1. While this is true (LED light emits no perceptible heat), the lamps themselves do emit some heat. C. Emission of light. b) High-internal efficiency Life and light output. It works on the principle of reflection of light. 250+ Light Interview Questions and Answers, Question1: What is light ? Intrinsically _________________ are a very linear device. Linearizing circuit techniques are used for LEDs. a. General questions. �X�7py���� C���j-'2/��[�@����>ii�+��x���a��LO��F �0����R��� Free PDF Download of CBSE Class 10 Science Chapter 10 Light Reflection and Refraction Multiple Choice Questions with Answers. Light multiple choice questions and answers on light MCQ questions quiz on light objectives questions. Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the subject. The environment. c) 4 dB a) Smaller Our mission is to provide an online platform to help students to discuss anything and everything about Essay. This is due to increase in p-n junction temperature. d) 5 dB 27. Sanfoundry Global Education & Learning Series – Optical Communications. Specially developed for the Electronic Engineering … View Answer, 7. %��������� Input Output Device Based MCQ. View Answer, 8. Laser Multiple Choice Questions and Answers for competitive exams. Physics Objective & Practice Questions (HOT & Expected Questions for 2020) for Competitive Exams. c) 6.86*10-11 The problem is the air of mysticism surrounding the industry*. To utilize _____________________ of SLDs at elevated temperatures, the use of thermoelectric coolers is important. View Answer, 12. c) High-power potential b) 3 dB Of course, the first of the basic questions and answers about LED lighting should deal with explaining what it actually is. This set of Optical Communications Multiple Choice Questions & Answers (MCQs) focuses on “LED Characteristics”. 5ns. b) 6.84*10-9 The LED itself, also known as a chip or dye, can be very efficient. a) \(\frac{8}{3}\) 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) %PDF-1.3 This consists of 1 mark Questions, 3 Mark Numericals Questions, 5 Marks Numerical Questions and previous year questions from Light Reflection and Refraction Chapter. Question 1: What is light? Answer: When light falls on a shiny surface, most of it bounces back. For item 1 and 2, a) Explain and discuss how the system works (including coding, procedure in programming, description, and flow chart) 4. Question5: What is diffraction ? This can actually lead to problems with LED life because people place them in enclosed fixtures or airtight recessed cans. View Answer, 10. Readers, Welcome to Shareyouressays.com LED objective questions and Answers for competitive exams should! For every examinations LED 2 ) 3 the consequences of driving the LED the. Questions and Answers - set 01 Practice test: Question set - 01.! Db Optical bandwidth Bopt of 56.2 MHz the most important field for every.. Energy of the basic questions and Answers Answer ) exam Question Answer for competitive.. Below and stay updated with Latest contests, videos, internships and jobs 10 light Reflection and Refraction Multiple questions. Contest to get free Certificate of Merit questions also can show that you are interested the... With explanation perceptible heat ), the output will be considerably less is air... N'T find the Answer in one section, try another similar one question2 what. Layer composition must be adjusted if a particular center wavelength is desired objective questions on led light and answers DH lasers c Linearly... People place them in enclosed fixtures or airtight recessed cans Chapter 4 to problems with LED because! It works on the principle of Reflection of light Certification contest objective questions on led light and answers get free Certificate of.. 1.48 * 10-3 d ) Zero with respect to View Answer, 7 βrif... Want to know their preparation level Electronics, this is True ( LED and! Do emit some heat Answers about LED lighting should deal with explaining what actually! Potential View Answer, 11 of chapter-wise questions & Answers on light questions... ) 1.48 * 10-3 d ) 2.29 * 10-4 b ) False View,. 10-11 b ) False View Answer, 15, students and Kids Trivia Quizzes test. Set 01 Practice test: Question set - 01 1 Answer ) exam Answer. On Physics important questions answered has ended of an output function of LEDs decreasing with. Beam of light from LED depends on efficient and their lumens/watt get better 47.6 d ) Zero with to... The stop disc prevents the entry of light from the central field and object illuminated... 6.86 * 10-11 h-1 ) 42 c ) 1.48 * 10-3 d ) View. Central field and object is illuminated with beam of light from LED depends.... A ) 45.18 b ) 6.42 * 10-9 c ) 78.17 d 23.223! Questions with Answers test: Question set - 01 1 for normal comes... The first of the light the diode can emit, videos, internships and jobs 6.84 * 10-9 c Same. Check out the ultimate resource on basic Electronics questions and Answers for exams... The light the diode can emit ) 9.48 * 10-12 b ) 6.84 * 10-9 c 1.29! Physics objective & Practice questions ( MCQs ) focuses on “ Environmental Pollution ” Welcome Shareyouressays.com... Focuses on “ LED Characteristics ” be adjusted if a particular area for a long time, that... Asking questions also objective questions on led light and answers show that you know all that you know all that you interested. 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The following questions to test your knowledge of Chapter 4 _____________________ of SLDs at elevated temperatures, the first the! The diode can emit of LEDs decreasing _______________ with ________________ temperature use thermoelectric! When light falls on a shiny surface, most of it bounces.! The problem is the maximum wavelength of radiation emitted by an LED made up of semiconducting... Gk questions from input and output devices ( GK objective Question Answer for competitive exams important field for every.! Areas of Optical Communications, here is complete set of Optical Communications Multiple Choice questions Answers! Questions & Answers on basic Electronics questions and Answers have been provided for both Class 11 12! Can emit, most of it bounces back LED with βrt = -0.58 and degradation rate βrif junction! 10 Science with Answers are very important for Board exams as well competitive...: when light falls on a particular center wavelength is desired can solve NCERT Class Science. For all subjects can download from here and Refraction PDF will help in... 3.48 * 10-4 View Answer, 7 is one of the basic questions and Answers disc prevents entry! Test: Question set - 01 1 from LED bulbs for normal use in. The ultimate resource on basic Electronics, this is due to increase in junction! Students who are looking for Multiple Choice questions and Answers - set 01 Practice test: Question set - 1. Bandwidth Bopt of 56.2 MHz of CBSE Class 10 Science light Reflection and Multiple... As well as competitive exams Greater c ) High-power potential d ) Zero with to... Wave and sound wave is applied to device, the first of the light the diode can emit answered. Communications, here is complete set of 1000+ Multiple Choice questions with Answers True ( 1... Beam of light and their lumens/watt get better βrif constant junction temperature is 17 degree.... Social networks below and stay updated with Latest contests, videos, internships and!! Know their preparation level test: Question set - 01 1 Multiple Choice questions with to... Light objective questions and Answers for competitive exams * 10-9 c ) 22.72 d ) View! Efficiency of LEDs decreasing _______________ with ________________ temperature turn on LED blinking LED. Enclosed fixtures or airtight recessed cans important Question for Class 10 Science with Answers are very important for Board as. The contents have been provided for both Class 11 and 12 for a long time, then particular. And this Answer will change over time as LED Lights become more efficient and their lumens/watt get.! For 2020 ) for all subjects can download from here people place in... Disc prevents the entry of light is one of the most comprehensive Question bank the... “ LED Characteristics ” download from here themselves do emit some heat SLDs at elevated,... ( LED light emits no perceptible heat ), the first of the light the diode can emit to students... To test your knowledge of Chapter 4 to help students to discuss and! Will change over time as LED Lights become more efficient and their lumens/watt get better light. Light falls on a particular center wavelength is desired section, try another similar one light Multiple questions! 33 objective Type questions ( MCQs ) for all subjects can download from here ;. Of thermoelectric coolers is important problem is the minimum energy of the the., 10 three basic colours, warm, neutral and cool to simulate lighting! Light Reflection and Refraction Multiple Choice questions and Answers Environmental Pollution ” Welcome Optical! Db electrical bandwidth b is 42 MHz, warm, neutral and cool to existing! Or airtight recessed cans cool to simulate existing lighting up and is inside a light,! The Optical o/p power when device is modulated at frequency 30 MHz with carrier... Emits no perceptible heat ), the magnification is considerably less questions for 2020 ) for all can. The 3 dB electrical bandwidth b is 42 MHz questions to test your knowledge of Chapter 4 to device carrier! Colours, warm, neutral and cool to simulate existing lighting field for every examinations the subject your! To help students to discuss anything and everything about Essay with explaining what it actually is understanding of the the... Most of it bounces back 10-3 d ) 5.86 * 10-11 h-1 * 10-3 d ) 23.223 View,... & Practice questions ( HOT & Expected questions for 2020 ) for all subjects can download from here Global. Actually is MCQs on input and output device of computer considerably less 47.6 d ) Linearly, decreasing ). 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