36. Due to which of the following reasons a lightning conductor on top of a building is made into a pointed spike? A. Dust particles may not accumulate B. Charge per unit area becomes very high for lightening to discharge C. Rain drops may not collect D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
37. The useful magnetic flux obtainable from any closed surface is A. Unity B. Constant C. Both A and B D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
38. When the phase velocity of an EM wave depends on frequency in any medium the phenomenon is called A. Scattering B. Polarisation C. Absorption D. Dispersion Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
39. A satellite that simply reflect back the signals from one region of the earth to the other region is known as A. Orbiting satellite B. Geostationary satellite C. Active satellite D. Passive satellite Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
40. The main disadvantage of the two-hole directional coupler is A. Poor directivity B. Narrow bandwidth C. High standing wave ratio D. Low directional coupling Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
