📊 PYQ Analysis — Last 10 Years
CBSE · JEE Main · JEE Advanced · NEET · Pattern dashboard · Difficulty level · Repeat patterns
This is a pattern analysis dashboard, not a question dump. Understanding why certain subtopics repeat is more valuable than seeing 100 past questions. Use the patterns to predict what's coming next.
CBSE Subtopic Frequency
Sample PYQ-Style Questions
Stress = Force/Area = [MLT⁻²]/[L²] = [ML⁻¹T⁻²] — NOT dimensionless.
Deviations: 0.01, 0.01, 0.02, 0.00, 0.02 → Mean abs error = 0.06/5 = 0.012 s
% Error = (0.012/2.00) × 100 = 0.6%
JEE Main Subtopic Frequency
Most Repeated Question Patterns
Matching Type
List I = physical quantities, List II = dimensions. Often 4-5 pairs. Tests breadth of dimensional knowledge in one question.
% Error in Formula
Given Q = aⁿbᵐ/cᵖ with errors in a, b, c. Find max % error. Power rule + addition. Appears almost every year.
Instrument Calculation
Vernier or screw gauge with specific scales. Find LC, read measurement, correct for zero error. 3 sub-parts often.
Option Elimination
Which expression could represent [quantity]? Eliminate dimensionally. 2-3 options are always wrong dimensionally.
Sample PYQ-Type
[μ₀/ε₀] = [M²L⁴T⁻⁶A⁻⁴] → [√(μ₀/ε₀)] = [ML²T⁻³A⁻²]
= [Resistance] (since R = V/I = ML²T⁻³A⁻²)
JEE Advanced Patterns (1980–2025)
Target: [L¹]
M: −a + b = 0 → b = a
L: 3a + 2b + c = 1
T: −2a − b − c = 0
Solving: a = b = ½, c = −3/2
So Y ∝ √(Gh/c³) — This is the Planck length!
NEET Subtopic Frequency
Options to check: angular momentum, angular velocity, angular impulse, linear momentum
Answer: Angular Momentum (L = mvr = [ML²T⁻¹])
🌡 Master Subtopic Heatmap
Frequency across all 4 exams. Use this to prioritize study.
| Subtopic | CBSE | NEET | JEE Main | JEE Advanced |
|---|---|---|---|---|
| SI Units & Base Quantities | High | Medium | Medium | Low |
| Dimensional Formulas | High | Very High | Very High | Very High |
| Least Count & Instruments | Medium | High | High | High |
| Significant Figures | High | High | High | Medium |
| Error Propagation | Medium | High | High | Very High |
| Constants (μ₀, ε₀, h, k_B) | Low | Medium | High | Very High |
| Experiment-Based Measurement | Medium | Medium | Medium | Dominant |
For CBSE: Focus on writing cleanly with correct SI symbols and sig figs. For NEET: Speed through dimensions and error formulas. For JEE Main: Drill dimensions of constants (μ₀, ε₀, h). For JEE Advanced: Master experimental error propagation and non-standard base units.