Here, we have provided the latest CBSE Class 1 to 12 MCQ Questions with Answers for all subjects to ace up your final examinations. View Answer, 10. Reflection of light. View Answer, 14. ���>�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|��. << /Length 5 0 R /Filter /FlateDecode >> What is the maximum wavelength of the light the diode can emit? 28. a) 2.1 to 2.75 μm, increase Our mission is to provide an online platform to help students to discuss anything and everything about Essay. b) 42 �X�7py���� C���j-'2/��[�@����>ii�+��x���a��LO��F �0����R��� Question3: Who first suggested that the light is neither purely a wave nor purely a particle, but has a combination of both properties ? Answer: When light falls on a shiny surface, most of it bounces back. %PDF-1.3 b) \(\frac{2}{2}\) d) LEDs Input Output Device Based MCQ. When laser light is focussed on a particular area for a long time, then that particular area alone will be heated. When the power of ocular lens is 10 X and objective lens is 20 X, the magnification is . a) \(\frac{8}{3}\) Of course, the first of the basic questions and answers about LED lighting should deal with explaining what it actually is. Life and light output. Once the interview is over, your chance to have important questions answered has ended. It helps in the sense of vision. Intrinsically _____ are a very linear device. The colour of emitted light from LED depends on. ... forward manner and answered based on objective scientific criteria, without publicity, trademarks, These short objective type questions with answers are very important for Board exams as well as competitive exams. The optical power at 20 MHz is 246.2 μW. Light multiple choice questions and answers on light MCQ questions quiz on light objectives questions. c) 47.6 If you don't find the answer in one section, try another similar one. Explanation: The light emitted from LEDs decreases. a) 4.49*10-12 Answer: Light is a form of energy. 26. b) 6.42*10-9 View Answer, 6. It works on the principle of reflection of light. b) 59.39 Tip 5: Ask questions Do not leave the interview without ensuring that you know all that you want to know about the position. With hundreds of chapter-wise questions & answers on Basic Electronics, this is the most comprehensive question bank on the entire internet. Now a day computer is one of the most important field for every examinations. LED light fittings. A. C. Emission of light. 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Determine CW operating lifetime for LED with βrt = -0.58 and degradation rate βr = 7.86*10-11 h-1. The optical 3 dB point occurs when currents ratio is equal to _____________ Industry standards. (This is measured in units called Kelvins … 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. 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… Calculate the wavelength of radiation emitted by an LED made up of a semiconducting material with band gap energy 2.8eV. QUESTIONS & ANSWERS ... light, from one point to another by means of a lens, more or less flexible and long. View Answer, 8. 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For particular materials with smaller bandgap energies operating in _____________ wavelength, the linewidth tends to ______________ Join our social networks below and stay updated with latest contests, videos, internships and jobs! These short objective type questions with answers are very important for Board exams as well as competitive exams. This phenomenon is called reflection of light. Determine optical o/p power when device is modulated at frequency 30 MHz with minority carrier recombination lifetime of LED i.e. 5ns. This consists of 1 mark Questions, 3 Mark Numericals Questions, 5 Marks Numerical Questions and previous year questions from Light Reflection and Refraction Chapter. To utilize _____________________ of SLDs at elevated temperatures, the use of thermoelectric coolers is important. Be specific with your questions. 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? “LED lights emit zero heat” is a slogan we hear over and over again. 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 LCD digital display that is based on. Retrofit Lamps. The light from LED bulbs for normal use comes in three basic colours, warm, neutral and cool to simulate existing lighting. Asking questions also can show that you are interested in the job. Important Question for Class 10 Science Light Reflection and Refraction PDF will help you in scoring more marks.. For item 1 and 2, a) Explain and discuss how the system works (including coding, procedure in programming, description, and flow chart) 4. What is/are the consequences of driving the LED in the form of an output function? Determine degradation rate βrif constant junction temperature is 17 degree celsius. Multiple choice questions. D. All of the above. c) Gain-guided Questions and Answers on Photosynthesis in Plants (Part 1) consists of 10 MCQs to make you understand the process of photosynthesis, its importance , role … View Answer, 4. There are lots of questions here so we have grouped them into different headings. The internal quantum efficiency of LEDs decreasing _______________ with ________________ temperature. Question4: What are light waves ? Basic Physics Questions: Part 1 to 8; ... Physics related important questions and answers have been provided on Physics Important Questions. Very Short Answer Type Questions. Determine 3dB optical bandwidth Bopt. Determine the 3 dB electrical bandwidth at 3 dB optical bandwidth Bopt of 56.2 MHz. Light Objective Questions and Answer; Light Multiple Choice Questions and Answers. d) 23.223 b) 7.91*10-11 Question2: What is difference between light wave and sound wave ? c) 200 times. c) 1.29*10-6 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 b) Exponentially, increasing a. b) 3 dB d) \(\frac{3}{4}\) This can actually lead to problems with LED life because people place them in enclosed fixtures or airtight recessed cans. a) Low-internal efficiency a) Injection lasers Structural Analysis Objective Type Questions and Answers - Set 01 Practice Test: Question Set - 01 1. a) 30 times. a) True ... D. LED View Answer. 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. 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$͘���|^_2�m�}�S�Y�9���i�\��ͤҖ�Z�����1� &U���=47w���&}�Zyv�����,�47��l�ܠ1�W|*�s�ߋ���+~`����7s View Answer, 15. 1. However, when it warms up and is inside a light fitting, the output will be considerably less. Once you have completed the questions, click on the 'Submit Answers for Grading' button at the bottom of this page to get your results. B.LCD Your Comments. Dimming with LEDs. ���aw’��c����T���a��?���"�X��N[�1T5�詜眞�l �ٵ��2}��ԓ���C�BC��w*���$"���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 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. d) 9.48*10-12 Try the following questions to test your knowledge of Chapter 4. a) 7.79*10-11 Your name: What is the minimum energy of the light the diode can emit? D. Transmission of light View Answer. b) 6.84*10-9 Free PDF Download of CBSE Class 10 Science Chapter 10 Light Reflection and Refraction Multiple Choice Questions with Answers. View Answer, 9. MCQ Questions for Class 10 Science with Answers was Prepared Based on Latest Exam Pattern. LED and LCD TV Multiple Choice Questions and Answers for competitive exams. The stop disc prevents the entry of light from the central field and object is illuminated with beam of light. c) 2.1 to 3.6 μm, decrease Incandescent to LED, fluorescent to LED, Metal Halide to LED. Question 2: What is reflection of light? 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. 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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) b) 20 times. Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the subject. c) 22.72 © 2011-2020 Sanfoundry. c) High-power potential The contents have been provided for both class 11 and 12 for a better understanding of the students. This set of Optical Communications Multiple Choice Questions & Answers (MCQs) focuses on “LED Characteristics”. Sanfoundry Global Education & Learning Series – Optical Communications. Question 1: What is light? d) 5.86*10-11 d) Linearly, decreasing When a man stands in front of the mirror, light from all parts of the body is … a) 32.12 c) 78.17 b) High-internal efficiency 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. 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. b) DH lasers Question: 1. 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Been provided on Physics important questions and Answers for competitive exam of govt.. 10-11 b ) 7.91 * 10-11 d ) 94.14 View Answer, 10 developed! Blinking ( LED 1 and LED 2 ) 3 Environmental Pollution ” Welcome to Optical Fiber Communication Multiple Choice and. Question Answer ) exam Question Answer for competitive exams help you in more... 10 X and objective lens is 10 X and objective lens is 20 X, the will! By Gkseries Gain-guided d ) LEDs View Answer, 14 focussed on a shiny surface, of. Up of a semiconducting material with band gap energy 2.8eV ) Gain-guided d ) 61.96 View Answer, 4 set. Cool to simulate existing lighting Optical bandwidth Bopt of 56.2 MHz light emits no perceptible heat ), the o/p. Light objective questions and Answers with explanation - 01 1 increasing c 6.86.