Fluid Mechanics
🟢 Lite — Quick Review (1h–1d)
Rapid summary for last-minute revision before your exam.
Fluid Mechanics — Key Facts Pressure: P = F/A = ρgh (hydrostatic); Pascal’s Law: pressure transmitted equally in all directions Archimedes’ Principle: Buoyant force B = ρVg (weight of displaced fluid) Continuity: A₁v₁ = A₂v₂ (incompressible fluid, conservation of mass) Bernoulli: P + ½ρv² + ρgh = constant (along a streamline) ⚡ Exam tip: Bernoulli is for horizontal flow OR when h is constant — use P + ½ρv² = constant
🟡 Standard — Regular Study (2d–2mo)
Standard content for students with a few days to months.
Fluid Mechanics — NEET/JEE Study Guide Archimedes: B = ρ_fluid × V_submerged × g; compare densities by weighing in fluid Floatation: fraction submerged = ρ_object/ρ_fluid; for ice floating in water: 9/10 submerged Continuity: Av = constant → v ∝ 1/A; for pipe narrowing, velocity increases Bernoulli application: Venturi meter (measure flow rate), Pitot tube (measure speed of aircraft), sprayer Surface tension: γ = F/L (force per unit length); excess pressure inside soap bubble = 4γ/r (2 surfaces) Capillarity: height h = 2γcosθ/(ρgr); rise if θ < 90° (water glass), fall if θ > 90° (mercury glass)
🔴 Extended — Deep Study (3mo+)
Comprehensive coverage for students on a longer study timeline.
Fluid Mechanics — Comprehensive Notes Navier-Stokes equation (terminal form): η ∇²v = ∇P - ρg for viscous flow at low Reynolds number Poiseuille’s law: volume flow rate Q = (πr⁴ΔP)/(8ηL); highly sensitive to radius (r⁴!) Stokes’ law: viscous drag F = 6πηrv; terminal velocity v_t = (2r²/9η)(ρ-σ)g for sphere Reynolds number: Re = ρvD/η; Re < 2000 → laminar; Re > 4000 → turbulent Venturi meter: Q = A₁A₂√(2gh/(A₁²-A₂²)) where h = difference in manometer levels Surface tension detailed: Laplace pressure ΔP = 2γ/r (sphere), ΔP = 4γ/r (soap bubble); drives capillary action Dimensional analysis: Buckingham Pi for drag force on sphere F = ηvD, Re = ρvD/η
📊 NEET UG Exam Essentials
| Detail | Value |
|---|---|
| Questions | 200 (180 mandatory + 10 optional) |
| Time | 3h 20min |
| Marks | 720 |
| Section | Physics (50), Chemistry (50), Biology (100) |
| Negative | −1 for wrong answer |
| Qualifying | 50th percentile (general category) |
| Topic Weightage | ~3% (based on 2023–2025 paper analysis) |
🎯 High-Yield Topics for NEET UG
- Human Physiology — 18 marks
- Genetics & Evolution — 16 marks
- Ecology & Environment — 12 marks
- Organic Chemistry (Reactions) — 15 marks
- Electrodynamics (Physics) — 18 marks
- Chemical Equilibrium — 10 marks
📝 Previous Year Question Patterns
- Q: “A particle moves in a circle…” [2024 Physics — 2 marks]
- Q: “Identify the incorrect statement about DNA…” [2024 Biology — 4 marks]
- Q: “The major product ofFriedel-Crafts acylation is…” [2024 Chemistry — 3 marks]
💡 Pro Tips
- NCERT Biology is the single most important resource — 80%+ questions are from NCERT lines
- Focus on Human Physiology, Genetics, and Ecology — together they make ~40% of Biology
- In Physics, master Electrostatics + Current Electricity + Magnetism (combined ~20%)
- Organic Chemistry: learn named reactions with mechanisms — they repeat across years
🔗 Official Resources
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📐 Diagram Reference
Clean educational diagram showing Fluid Mechanics with clear labels, white background, labeled arrows for forces/fields/vectors, color-coded components, exam-style illustration
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