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Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 22 July 2021, Shift 2, Physics Q1

Question 1 of 90 in this shift, Physics question 1 of 30, Section A.

What should be the height of transmitting antenna and the population covered if the television telecast is to cover a radius of 150 km ? The average population density around the tower is 2000/km2^2 and the value of Re=6.5×106\mathrm{R_e} = 6.5\times10^{6} m.
  1. (1)Height =1600= 1600 m Population Covered =2×105= 2\times10^{5}
  2. (2)Height =1241= 1241 m Population Covered =7×105= 7\times10^{5}
  3. (3)Height =1731= 1731 m Population Covered =1413×105= 1413\times10^{5}Official answer
  4. (4)Height =1800= 1800 m Population Covered =1413×108= 1413\times10^{8}

Official answer

Option 3

NTA final key.

Chapter
Communication Systems
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.