Learn

Friday, 9 October

JEE Main Physics · Waves

Doppler Effect in JEE Main

Doppler Effect (Physics, Waves) came 4 times in 4 of the 42 JEE Main shifts Lumi analysed, across 3 distinct ideas. 0 of them came in 2024–26; it was last asked in 2023.

Questions
4
in 4 shifts
Ideas asked
3
1 asked more than once
Numerical answer
3
75% of its questions
Pattern
Frequent
rarely asked since 2024
Questions each year
0241’170’200’212’221’230’240’250’26

In the shifts Lumi analysed for each year.

Difficulty and format
Easy 0Medium 4Hard 0

Format

  • Numerical value3 Q
  • Single correct1 Q
Ideas inside the topic
3 ideas
Where it sits

Part of Waves, which had 27 questions in all. Doppler Effect accounts for 15% of them. In Lumi's JEE taxonomy it belongs to Waves and SHM.

Some questions sit in other chapters too: Dual Nature of Radiation and Matter.

Every question

All 4 Doppler Effect questions

Newest first, each with its options and official answer.

  1. 6 Apr 2023, Shift 1 · Q51A person driving car at a constant speed of 15 m/s is approaching a vertical wall. The person notices a change of 40 Hz in the frequency…MediumNumerical value
  2. 25 Jul 2022, Shift 1 · Q55An observer is riding on a bicycle and moving towards a hill at 18 km h−118\ \mathrm{km\,h^{-1}}. He hears a sound from a source at some distance…MediumNumerical value
  3. 28 Jul 2022, Shift 1 · Q57The frequency of echo will be __________ Hz if the train blowing a whistle of frequency 320 Hz is moving with a velocity of 36 km/h…MediumNumerical value
  4. 2 Apr 2017 (offline) · Q13An observer is moving with half the speed of light towards a stationary microwave source emitting waves at frequency 10 GHz. What is the…MediumSingle correct