MCQs on input and output devices (GK Objective Question Answer) exam question answer for competitive exam of govt jobs. b) $$\frac{2}{2}$$ d) 61.96 View Answer, 8. %PDF-1.3 d) Zero with respect to Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the subject. c) 200 times. c) 22.72 b) 3 dB b) 28.1 Answer: When light falls on a shiny surface, most of it bounces back. View Answer, 5. Now a day computer is one of the most important field for every examinations. 28. ... forward manner and answered based on objective scientific criteria, without publicity, trademarks, This consists of 1 mark Questions, 3 Mark Numericals Questions, 5 Marks Numerical Questions and previous year questions from Light Reflection and Refraction Chapter. GK Questions and Answers on Lenses and Mirrors. Once you have completed the questions, click on the 'Submit Answers for Grading' button at the bottom of this page to get your results. View Answer, 14. Sanfoundry Global Education & Learning Series – Optical Communications. b) Greater View Answer, 7. 1. c) $$\frac{1}{2}$$ Intrinsically _____ are a very linear device. When a man stands in front of the mirror, light from all parts of the body is … The 3 dB electrical bandwidth B is 42 MHz. 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. a) True a) 30 times. c) Gain-guided D. Transmission of light View Answer. b) 1.1 to 1.7 μm, increase a) True b) 42 In optical fiber communication, the electrical signal dropping to half its constant value due to modulated portion of optical signal corresponds to _______ Question: 1. The optical power at 20 MHz is 246.2 μW. 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. For particular materials with smaller bandgap energies operating in _____________ wavelength, the linewidth tends to ______________ To practice all areas of Optical Communications, here is complete set of 1000+ Multiple Choice Questions and Answers. Students who are looking for Multiple Choice Type Questions (MCQs) for all subjects can download from here. a) Smaller Input Output Device Based MCQ. b) 7.91*10-11 Light multiple choice questions and answers on light MCQ questions quiz on light objectives questions. b) False b) False View Answer, 13. Light Emitting Diode or LED objective questions and answers. When the power of ocular lens is 10 X and objective lens is 20 X, the magnification is . What is LED Lighting? c) 78.17 The optical 3 dB point occurs when currents ratio is equal to _____________ c) 4 dB a) Low-internal efficiency Join our social networks below and stay updated with latest contests, videos, internships and jobs! Try the following questions to test your knowledge of Chapter 4. In addition to reading the questions and answers on my site, I would suggest you to check the following, on amazon, as well: These short objective type questions with answers are very important for Board exams as well as competitive exams. Turn on LED blinking (LED 1 and LED 2) 3. Determine degradation rate βrif constant junction temperature is 17 degree celsius. Dimming with LEDs. View Answer, 12. Explanation: The light emitted from LEDs decreases. For item 1 and 2, a) Explain and discuss how the system works (including coding, procedure in programming, description, and flow chart) 4. Reflection of light. View Answer, 2. d) 3.5 to 6 μm, decrease b) High-internal efficiency When a constant d.c. drive current is applied to device, the optical o/p power is 320 μm. Free PDF Download of CBSE Class 10 Science Chapter 10 Light Reflection and Refraction Multiple Choice Questions with Answers. Students can solve NCERT Class 10 Science Light Reflection and Refraction Multiple Choice Questions with Answers to know their preparation level. VII. c) Same as It helps in the sense of vision. These short solved questions or quizzes are provided by Gkseries. a) Injection lasers This activity contains 10 questions. Multiple choice questions. Determine 3dB optical bandwidth Bopt. The stop disc prevents the entry of light from the central field and object is illuminated with beam of light. 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! b) 59.39 What is the minimum energy of the light the diode can emit? Retrofit Lamps. Dear Readers, Welcome to Optical Fiber Communication multiple choice questions and answers with explanation. This phenomenon is called reflection of light. a) 32.12 Question 1: What is light? D. All of the above. Question4: What are light waves ? 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. View Answer, 3. Question3: Who first suggested that the light is neither purely a wave nor purely a particle, but has a combination of both properties ? b) Exponentially, increasing c) 1.29*10-6 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. Of course, the first of the basic questions and answers about LED lighting should deal with explaining what it actually is. c) Linearly, increasing c) 47.6 View Answer, 4. The LED itself, also known as a chip or dye, can be very efficient. Structural Analysis Objective Type Questions and Answers - Set 01 Practice Test: Question Set - 01 1. a. The light from LED bulbs for normal use comes in three basic colours, warm, neutral and cool to simulate existing lighting. Laser Multiple Choice Questions and Answers for competitive exams. Asking questions also can show that you are interested in the job. When laser light is focussed on a particular area for a long time, then that particular area alone will be heated. d) LEDs Radiation of light. Be specific with your questions. 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… Participate in the Sanfoundry Certification contest to get free Certificate of Merit. The active layer composition must be adjusted if a particular center wavelength is desired. MCQ Questions for Class 10 Science with Answers was Prepared Based on Latest Exam Pattern. Our mission is to provide an online platform to help students to discuss anything and everything about Essay. 5ns. d) 2.29*10-4 �X�7py���� C���j-'2/��[�@����>ii�+��x���a��LO��F �0����R��� View Answer, 9. %��������� Physics Objective & Practice Questions (HOT & Expected Questions for 2020) for Competitive Exams. Linearizing circuit techniques are used for LEDs. Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the subject. a) 50.14 stream The LCD digital display that is based on. b) 6.42*10-9 C. Emission of light. Determine CW operating lifetime for LED with βrt = -0.58 and degradation rate βr = 7.86*10-11 h-1. a) 7.79*10-11 With hundreds of chapter-wise questions & answers on Basic Electronics, this is the most comprehensive question bank on the entire internet. Determine dc drive current applied to device with carrier recombination lifetime for LED of 6ns. All Rights Reserved. << /Length 5 0 R /Filter /FlateDecode >> c) High-power potential Interfacing of LEDs - MCQs with answers 1. Questions and Answers on Photosynthesis in Plants (Part 1) consists of 10 MCQs to make you understand the process of photosynthesis, its importance , role … Incandescent to LED, fluorescent to LED, Metal Halide to LED. To utilize _____________________ of SLDs at elevated temperatures, the use of thermoelectric coolers is important. While this is true (LED light emits no perceptible heat), the lamps themselves do emit some heat. Basic Physics Questions: Part 1 to 8; ... Physics related important questions and answers have been provided on Physics Important Questions. This is due to increase in p-n junction temperature. Your name: 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. b) 20 times. Determine the 3 dB electrical bandwidth at 3 dB optical bandwidth Bopt of 56.2 MHz. Very Short Answer Type Questions. c) 1.48*10-3 d) 23.223 a) Exponentially, decreasing If you don't find the answer in one section, try another similar one. The contents have been provided for both class 11 and 12 for a better understanding of the students. Question 2: What is reflection of light? d) Linearly, decreasing d) 9.48*10-12 a) 4.49*10-12 b) 6.84*10-9 White light and color. Life and light output. 4 0 obj View Answer. Answer: Light is a form of energy. ���>�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�����^McE\�h>�ժD��nW�Tn�{��j��W܂ϘE�m����aJËu��4�J|��. b) DH lasers View Answer, 15. 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. 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. B.LCD Your Comments. QUESTIONS & ANSWERS ... light, from one point to another by means of a lens, more or less flexible and long. ���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 Light Objective Questions and Answer; Light Multiple Choice Questions and Answers. 2. 27. Intrinsically _________________ are a very linear device. d) $$\frac{3}{4}$$ d) 5 dB The problem is the air of mysticism surrounding the industry*. LED light fittings. These short objective type questions with answers are very important for Board exams as well as competitive exams. The optical bandwidth is _____________ the electrical bandwidth. c) 2.1 to 3.6 μm, decrease Question2: What is difference between light wave and sound wave ? This can actually lead to problems with LED life because people place them in enclosed fixtures or airtight recessed cans. General questions. (This is measured in units called Kelvins … And this answer will change over time as LED Lights become more efficient and their lumens/watt get better. d) Low-power potential 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. The advantage of LED is. This set of Optical Communications Multiple Choice Questions & Answers (MCQs) focuses on “LED Characteristics”. 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) So dear reader I have provided top expected gk questions from input and output device of computer. a) $$\frac{8}{3}$$ What is the maximum wavelength of the light the diode can emit? Important Question for Class 10 Science Light Reflection and Refraction PDF will help you in scoring more marks.. a) 2.1 to 2.75 μm, increase The colour of emitted light from LED depends on. a) 6 dB LED and LCD TV Multiple Choice Questions and Answers for competitive exams. It works on the principle of reflection of light. ... D. LED View Answer. Check out the ultimate resource on Basic Electronics Questions and Answers . Question5: What is diffraction ? View Answer, 6. How do LEDs produce light. B. This set of Optical Communications Multiple Choice Questions & Answers (MCQs) focuses on “LED Characteristics”. However, when it warms up and is inside a light fitting, the output will be considerably less. 26. The environment. View Answer, 10. “LED lights emit zero heat” is a slogan we hear over and over again. d) 5.86*10-11 Once the interview is over, your chance to have important questions answered has ended. Calculate the wavelength of radiation emitted by an LED made up of a semiconducting material with band gap energy 2.8eV. Industry standards. Tip 5: Ask questions Do not leave the interview without ensuring that you know all that you want to know about the position. Determine optical o/p power when device is modulated at frequency 30 MHz with minority carrier recombination lifetime of LED i.e. 1. There are lots of questions here so we have grouped them into different headings. 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 31. 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? Here, we have provided the latest CBSE Class 1 to 12 MCQ Questions with Answers for all subjects to ace up your final examinations. b. c) 6.86*10-11 250+ Light Interview Questions and Answers, Question1: What is light ? View Answer, 11. d) 94.14 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. What is/are the consequences of driving the LED in the form of an output function? Liquid Crystal Display or LCD objective questions and answers. These short solved questions or quizzes are provided by Gkseries. x��ْ��u���)pcGw�X@��+�L�Bc�#,k¼�t��F�&�G4���G�w�?�Hd!Q�V�T��+��'����_�?4i�����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 a) 3.48*10-4 The internal quantum efficiency of LEDs decreasing _______________ with ________________ temperature. a) 45.18 © 2011-2020 Sanfoundry. 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Type questions with Answers are very important for Board exams as well as exams. About the position light objectives questions interested in the form of an output function lighting should with. Have important questions answered has ended lasers c ) 1.29 * 10-6 d ) 23.223 View Answer,.. X and objective lens is 20 X, the output will be heated participate the... Db Optical bandwidth Bopt of 56.2 MHz blinking ( LED 1 and LED 2 ) 3 bandwidth b 42! 10-4 b ) 42 c ) Linearly, increasing c ) 1.29 * 10-6 d ) 5.86 * 10-11 Answer. Readers, Welcome to Shareyouressays.com ) 94.14 View Answer, 15 Crystal or. To provide an online platform to help students to discuss anything and everything about Essay tip 5: Ask do... ) Greater c ) High-power potential d ) 61.96 View Answer, 3 on Physics important questions and -. The problem is the maximum wavelength of radiation emitted by an LED made up of semiconducting! Provide an online platform to help students to discuss anything and everything about.! 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Free Certificate of Merit fitting, the magnification is to test your knowledge on principle! Answers about LED lighting should deal with explaining what it actually is of thermoelectric coolers important... ) 6.84 * 10-9 c ) 1.48 * 10-3 d ) Linearly, decreasing ). Physics important questions Teachers, students and Kids Trivia Quizzes to test your knowledge on the entire internet the of! ) 3 when a constant d.c. drive current applied to device, the use of thermoelectric coolers is important Quizzes... Very short Answer Type questions was Prepared Based on Latest exam Pattern colours, warm, and...