14 chapter playbooks behind every NDA Physics question

34 q · 3% HARD — the bank's lowest-HARD chapter. Properties of sound (amplitude, pitch, loudness), v=fλ plug-in, SONAR, beats, ear anatomy. Pure recall + one-step calc.

25 q · 0% HARD. Atomic structure, nuclear fission/fusion, photoelectric effect (qualitative), E=hf dimension, scientist–discovery pairs, acronyms (LED, LASER). Every question is recall.

14 q · 7% HARD. SI vs CGS unit recall, dimensional formulas (G, h, force, pressure), 'which is dimensionless?', precision/least-count. Mostly EASY; one HARD per paper at most.

4 q · 0% HARD across 10 years. Light year, parsec, planets-by-size, black hole = star remnant. Easiest 4 marks in the bank — read once, memorise once, done.

2 q · 0% HARD across 10 years. Conventional vs non-conventional, bio-mass identification. Don't over-invest — but don't skip either, it's a recall freebie.

97 q · 10% HARD — the largest chapter. Hybrid: half recall (Light Phenomena, Optical Instruments, Eye defects), half formula-apply (mirror formula, lens formula, Snell's law, lens-power calc). Drill Light Phenomena + Optical Instruments first for fast marks.

41 q · 10% HARD. Newton's three laws (statements + applications), momentum conservation in collisions/recoil/explosions, impulse=Δp. The chapter that grew 3× in 2023–24.

24 q · 25% HARD. Small chapter, heavy HARD load. v=u+at, s=ut+½at², v²=u²+2as plug-in dominates, plus V-T/X-T graph reading and the lone Vectors-and-Position subtopic at 67% HARD.

23 q · 9% HARD. KE=½mv², PE=mgh, W=Fd cosθ, P=W/t. Conservation between KE↔PE in free-fall and on inclined planes. Simple Machines (lever class identification) is the recall corner.

17 q · 12% HARD. F=Gm₁m₂/r², g=GM/R², escape velocity √(2gR), orbital period T²∝R³ (Kepler 3rd), weightlessness in free-fall. The 'planet-scaled' ratio question is the recurring HARD shape.

13 q · 15% HARD. Simple pendulum T=2π√(L/g) (period-vs-length-vs-mass-vs-g ratios), SHM displacement/velocity/acceleration sign mapping, wave property statements. Small chapter, formula-rich.

93 q · 22% HARD — the bank's #1 HARD pool. Combination of Resistors (16 q at 38% HARD) carries the chapter. Series-vs-parallel resistor reasoning, V=IR, P=I²R, charge-in-magnetic-field force direction, electrostatics shell theorem. The single highest-leverage chapter for HARD-pool prep.

39 q · 21% HARD. Calorimetry mixing (heat-balance equations with phase change) + thermodynamic process variants (PV=nRT, PVⁿ=const, P=kT) are the HARD pools. Temperature-scale conversions and latent-heat statement-truth are the EASY plumbing.

23 q · 30% HARD — the chapter with the highest %HARD in the bank. Buoyancy with density mixing (ρ₁+ρ₂ by equal-volume vs equal-mass), pressure P=hρg, surface tension. Small chapter, dense traps.