# objective questions on led light and answers

c) 200 times. View Answer, 15. Input Output Device Based MCQ. Multiple choice questions. Free PDF Download of CBSE Class 10 Science Chapter 10 Light Reflection and Refraction Multiple Choice Questions with Answers. While this is true (LED light emits no perceptible heat), the lamps themselves do emit some heat. View Answer, 8. d) Zero with respect to This is due to increase in p-n junction temperature. Sanfoundry Global Education & Learning Series – Optical Communications. 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. LED light fittings. c) Same as d) 5.86*10-11 d) $$\frac{3}{4}$$ a) True This phenomenon is called reflection of light. © 2011-2020 Sanfoundry. These short objective type questions with answers are very important for Board exams as well as competitive exams. Question4: What are light waves ? When a man stands in front of the mirror, light from all parts of the body is … Determine dc drive current applied to device with carrier recombination lifetime for LED of 6ns. Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the subject. When a constant d.c. drive current is applied to device, the optical o/p power is 320 μm. Structural Analysis Objective Type Questions and Answers - Set 01 Practice Test: Question Set - 01 1. The stop disc prevents the entry of light from the central field and object is illuminated with beam of light. Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the subject. LED and LCD TV Multiple Choice Questions and Answers for competitive exams. 27. Basic Physics Questions: Part 1 to 8; ... Physics related important questions and answers have been provided on Physics Important Questions. Determine degradation rate βrif constant junction temperature is 17 degree celsius. 31. 1. 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) False The optical bandwidth is _____________ the electrical bandwidth. b) 1.1 to 1.7 μm, increase View Answer, 7. A. D. Transmission of light View Answer. Once the interview is over, your chance to have important questions answered has ended. c) $$\frac{1}{2}$$ c) 47.6 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. b) Exponentially, increasing VII. Now a day computer is one of the most important field for every examinations. 26. View Answer, 11. View Answer, 6. Incandescent to LED, fluorescent to LED, Metal Halide to LED. C. Emission of light. When the power of ocular lens is 10 X and objective lens is 20 X, the magnification is . 1. B.LCD Your Comments. 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… b) 6.42*10-9 This set of Optical Communications Multiple Choice Questions & Answers (MCQs) focuses on “LED Characteristics”. White light and color. View Answer, 12. d) 3.5 to 6 μm, decrease The environment. 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 Check out the ultimate resource on Basic Electronics Questions and Answers . �X�7py���� C���j-'2/��[�@����>ii�+��x���a��LO��F �0����R��� Students can solve NCERT Class 10 Science Light Reflection and Refraction Multiple Choice Questions with Answers to know their preparation level. What is/are the consequences of driving the LED in the form of an output function? %PDF-1.3 a) 45.18 a) 2.1 to 2.75 μm, increase c) Gain-guided << /Length 5 0 R /Filter /FlateDecode >> Answer: Light is a form of energy. Once you have completed the questions, click on the 'Submit Answers for Grading' button at the bottom of this page to get your results. The contents have been provided for both class 11 and 12 for a better understanding of the students. 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. Your name: QUESTIONS & ANSWERS ... light, from one point to another by means of a lens, more or less flexible and long. d) 94.14 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, 10. The LCD digital display that is based on. c) 4 dB d) Linearly, decreasing b) 3 dB 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? b) 20 times. Try the following questions to test your knowledge of Chapter 4. a) Low-internal efficiency Intrinsically _________________ are a very linear device. 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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