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Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceSingle correctEasyApplication

JEE Main 4 August 2021, Shift 1, Physics Q1

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

A wave of wavelength 0.75 cm is produced in air and travels at a speed of 300 m/s. Which of the following is most appropriate option ?
  1. (1)It is a sound wave.
  2. (2)It is an ultrasonic wave.
  3. (3)It is not audible.
  4. (4)It is an ultrasonic wave and It is not audible both are correct.Official answer

Official answer

Option 4

NTA final key.

Chapter
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 108 of the 174 JEE Main shifts held from 2017 to 2026.