JEE Main · Physics · Waves
Beats: JEE Main previous year questions
4 questions in the 108 JEE Main shifts Lumi analysed, in 3 of 8 years. Pattern: Comes in cycles. 1 came in 2024–26. Here is how it is asked and which ideas come back.
- Questions
- 4
- in 4 of 108 shifts
- Years asked
- 3/8
- last asked 2025
- Weighted estimate
- 0.0
- model; history: 0.0 a shift on average, typically 0.0–0.1
Key findings
- 01
Asked in 3 of 8 years with analysed shifts and in 4 of 108 shifts: 4 questions, #192 of 196 topics. The years that asked it were 2.0 apart on average. Last asked in 2025.
- 02
100% of its questions since 2020 tested an idea no earlier year had asked; none repeated an idea from the year before.
- 03
No idea in this topic has been asked twice: every question tested something new.
- 04
JEE Main has asked 4 of the 58 ideas in this topic; 52 have never been asked, directly or inside another question.
- 05
Mostly asked as single correct (75%); 25% need a numerical answer, 25% are easy and 0% hard.
- 06
The skill tested most is calculation (75%), then application (25%).
Questions a shift, year by year
Out of the 25 Physics questions in a shift. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift.
Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 1 in 24 shifts · 2022: 2 in 24 shifts · 2023: 0 in 12 shifts · 2024: 0 in 18 shifts · 2025: 1 in 8 shifts · 2026: 0 in 9 shifts.
- Up to 2023
- 0.0
- a shift, of 25
- Since 2024
- 0.0
- 0.0
- Usual gap
- 2.0 yrs
- between years asking it
- Shifts with it
- 4/108
- 4% of analysed shifts
How it is asked
Difficulty, format and skill
Across all 4 questions on Beats since 2017.
Difficulty
QUESTIONS- Easy1 · 25%
- Medium3 · 75%
- Hard0 · 0%
Format
SHARE- Single correct · 3 Q75%
- Numerical value · 1 Q25%
Skill tested
SHARE- Calculation · 3 Q75%
- Application · 1 Q25%
Repeats
New idea, or one asked before?
Each column is a year. Blue questions tested an idea no earlier year had asked; navy ones went back to an idea from an earlier year. 2017 is the first year, so everything in it counts as new. Heights are question counts, and Lumi analysed 1 to 24 shifts a year, so compare the split inside a column rather than heights across years.
- Idea asked for the first time
- Idea asked in an earlier year
Coverage of the topic
JEE Main has asked 4 of the 58 ideas in this topic. 52 have never been asked yet.
- Asked directly4 · 7%
- Touched inside another question2 · 3%
- Never asked52 · 90%
Ideas come from Lumi’s JEE syllabus map. A never-asked idea is not a safe skip: across all of JEE Main, 22% of questions since 2024 tested an idea no earlier year had asked.
Drill down
Idea, year, question
Every idea JEE Main tested in this topic, with its eight years. Open one to read the questions.
- 28 Jun ’22 S1 · Q50The velocity of sound in a gas, in which two wavelengths 4.08m and 4.16m produce 40 beats in 12s, will be :
mediumSingle correctNew idea
- 28 Jun ’22 S1 · Q50
Squares are the 8 years with analysed shifts, 2017 to 2026. A number is the questions that year when there is more than one; the shade is scaled to one shift, so a year with more analysed shifts (1 to 24 a year) does not look darker. Share is of the level above.
Ideas
Every idea inside this topic
4 different ideas were tested; none came more than once.
beat period from resultant wave equation
Single correct · 1 shiftwave speed from beats and wavelengths
Single correct · 1 shiftfrequency of last fork in beat series
Numerical value · 1 shift · 1 numericalunknown frequency from beats after filing fork
Single correct · 1 shift
| Idea | Years asked | Times | Shifts | Format | Numerical |
|---|---|---|---|---|---|
| Resultant Wave Equation in Beatsbeat period from resultant wave equation | 1 | 1 | Single correctCalculation | – | |
| Beat Frequency Calculationwave speed from beats and wavelengths | 1 | 1 | Single correctCalculation | – | |
| Frequency Calculation in a Tuning Fork Seriesfrequency of last fork in beat series | 1 | 1 | Numerical valueCalculation | 1 | |
| Effect of Filing Forkunknown frequency from beats after filing fork | 1 | 1 | Single correctApplication | – |
Times and shifts count every analysed shift. Across JEE Main, 78% of questions since 2024 went back to an idea an earlier year had asked; the rest were new. All repeated ideas
Every question
Beats questions, year by year
The opening words of each question as it appeared in the official paper, with the idea it tested. Open one for its options and the official answer.
JEE Main 20251 question in 1 shift
- 7 Apr, Shift 1Q34Two harmonic waves moving in the same direction superimpose to form a wave where t is in seconds. Find the…
Idea: Resultant Wave Equation in Beats
New ideaMediumSingle correct
JEE Main 20222 questions in 2 shifts
- 26 Jun, Shift 2Q56A set of 20 tuning forks is arranged in a series of increasing frequencies. If each fork gives 4 beats with respect to the preceding fork…
Idea: Frequency Calculation in a Tuning Fork Series
New ideaMediumNumerical value - 28 Jun, Shift 1Q50The velocity of sound in a gas, in which two wavelengths 4.08m and 4.16m produce 40 beats in 12s, will be :
Idea: Beat Frequency Calculation
New ideaMediumSingle correct
JEE Main 20211 question in 1 shift
- 26 Feb, Shift 2Q3A tuning fork A of unknown frequency produces 5 beats/s with a fork of known frequency 340 Hz. When fork A is filed, the beat frequency…
Idea: Effect of Filing Fork
New ideaEasySingle correct
Questions from the official JEE Main Paper 1 shifts published by NTA (CBSE for 2017). Questions NTA dropped are left out. Topic and idea tags, counts and notes are Lumi’s.