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Friday, 9 October

JEE Main 2021 · PhysicsMultiple choiceAssertion–reasonEasyConceptual

JEE Main 3 August 2021, Shift 2, Physics Q19

Question 19 of 90 in this shift, Physics question 19 of 30, Section A.

Given below are two statements : one is labeled as Assertion A and the other is labeled as Reason R. Assertion A : Communication techniques which are using much higher frequencies like TV signal broadcast, can not be received beyond the line-of-sight. Reason R : Radio waves used for radio broadcast which are in the below critical frequency range, receive reflection from the ionosphere and can be received by the receiving antenna. In the light of the above statements, choose the correct answer from the options given below.
  1. (1)Both A and R are true and R is the correct explanation of A.Official answer
  2. (2)Both A and R are true but R is NOT the correct explanation of A.
  3. (3)A is true but R is false.
  4. (4)A is false but R is true.

Official answer

Option 1

NTA final key.

Chapter
Electromagnetic Waves
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 42 of the 174 JEE Main shifts held from 2017 to 2026.