Get to the point AIIMS (All India Institute of Medical Sciences) Physics questions for your exams. Q8. Sky wave propagation is preferred when the wave has to travel a longer distance. Propagation of Radio waves takes place by different modes, the mechanism being different in each case. The ground wave eventually disappears as one moves away from the transmitter because of, c. maximum single-hop distance limitation, 61. in electromagnetic waves, polarization means, a. the physical orientation of magnetic field in space, b. the physical orientation of electric field in space, d. the presence of positive and negative ions. Indicate which of the following frequencies cannot be used for reliable beyond-the-horizon terrestrial communications without repeaters, c. capable of use for long-distance communications on the moon, 55. MCQ quiz on Antenna and Wave Propagation multiple choice questions and answers on antenna and wave propagation MCQ questions quiz on antenna and wave propagation objectives questions with answer test pdf. New Post! ANSWER: Sky wave propagation. A Skywave Propagation: The electromagnetic waves emitted by transmitting antenna are received after being reflected from the ionosphere are called sky waves and this type of propagation is called Sky wave Propagation. b. increase the range of the ground wave . Ground wave propagation c. Sky wave propagation d. All of the above. 40. Ground wave propagation C. Sky wave propagation D. All of the above Ans: Sky wave propagation 41. Space (Tropospheric) waves 3. 92. Try this amazing Quiz: Trivia Questions On Electromagnetic Wave! quiz which has been attempted 1361 times by avid quiz takers. A. Q10. Line of sight communications is not a factor in which frequency range? Answer: (C) Both a and b. Which of the following is a good indicator of the possibility of sky-wave propagation on the 6 meter band? signals? 93. The electric field and magnetic field of a radio wave are (A) Perpendicular to each other (B) Perpendicular to the direction of propagation (C) Both a and b (D) None of the above. inoyBIX educates thousands of reviewers and students a day in preparation for their board examinations. Microwave signals propagate by way of the, 91. Light enters a glass plate at an angle of incidence of 40 degrees and is refracted at an angle refraction of 25 degrees. Always seems more than its actual depth, c. May seems more than its actual depth, depending on the index of refraction of the liquid, d. May seem less or more than its actual depth depending on the angle of view, 78. Transducer is a device used for converting a one form of energy into another. The index refraction of the glass is, 86. 63. the absorption of a radio waves by the atmosphere depends on, a. is caused by reflections from the ground, b. arises only with spherical wave fronts, c. will occur when the waves pass through a large slot, d. may occur around the edge of a sharp object, 65. Learn important MCQs (with solutions) for CBSE Class 12th Physics Board Exam 2020 (Chapter 15 - Communication Systems). MCQ S Radiowave Propagation Radio Propagation Scribd. 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These MCQs are very useful for other competitive exams like UPSEE 2020, JEE Main 2020, WBJEE 2020 etc. The ionosphere is responsible for, d. The ability of satellites to orbit the earth, 69. 2 MHz to 30 MHz frequencies are propagating through the sky waves. The minimum transmission distance is. The radio waves can be sent from one place to another through ground wave propagation, sky wave propagation and space wave propagation. 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Local and distant skywave propagation. Q2. The ionosphere is a region of the upper atmosphere, from about 80 km to 1000 km in altitude, where … The radio waves can be sent from one place to another through ground wave propagation, sky wave propagation and space wave propagation. When the light ray approaches a glass-air interface from the glass side at the critical angle, the angle of refraction is, 80. The ionosphere in the upper portion of the Modulation is the process of superposing, (a) high frequency audio signal on low frequency audio signal, (b) high frequency message signal on low frequency audio waves, (c) low frequency message signal on high frequency waves, (d) low frequency radio signal on high frequency audio waves. Explanation: No explanation is available for this question! Indicate which one of the following terms applies to troposcatter propagation, 52. States that power density is inversely proportional to the distance from its source. Students preparing for CBSE Class 12th Physics Board Exam 2020 usually ask about important MCQs (Multiple Choice Questions) & here we have provided important questions (with solution), based on Chapter 15 (Communication Systems) of Class 12th Physics NCERT textbook. The mode of communication used for T.V. At 300 GHz, the wavelength is 1 mm and at 3 kHz it is 100 km. UNIT VIII Wave Propagation – II: Antenna and wave propagation pdf; Sky Wave Propagation — Introduction. An antenna is an electrical conductor or system of conductors. 75. Trans- mission can be received (Radius of earth = 8 X 106 m)? 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