odadmin

Attempt all 30 MCQs and check your score instantly. 1. RMS value of current is: I₀/√2 I₀ √2I₀ none 2. AC current varies: sinusoidally linearly constant none 3. Frequency unit: Hz Volt Ampere Joule 4. Angular frequency: 2πf f/2π f² none 5. Capacitive reactance: 1/ωC ωL R none 6. Inductive reactance: ωL 1/ωC R none 7. Impedance unit: Ohm Volt Ampere Watt 8. Power factor: cosφ sinφ tanφ none 9. Pure resistor phase: 0 90° 180° none 10. Pure inductor phase: 90° 0 180° none 11. Pure capacitor phase: -90° 0 90° none 12. Impedance formula: √(R²+(XL-XC)²) R+XL XC none 13. Resonance condition: XL=XC XL>XC XC>XL none 14. Resonant frequency: 1/2π√LC √LC LC none 15. At resonance impedance: minimum maximum zero none 16. RMS voltage: V₀/√2 V₀ √2V₀ none 17. Average AC over cycle: zero max min none 18. Power in AC circuit: VI cosφ VI I²R none 19. Inductor stores energy in: magnetic field electric field heat none 20. Capacitor stores energy in: electric field magnetic field heat none 21. AC generator works on: EMI Ohm law current none 22. Transformer core material: soft iron copper plastic none 23. Power factor for pure resistor: 1 0 -1 none 24. Power factor for pure inductor: 0 1 -1 none 25. Power factor for pure capacitor: 0 1 -1 none 26. LC circuit oscillation frequency: 1/2π√LC √LC LC none 27. Peak current relation: I = I₀ sinωt I=IR V=IR none 28. Phase difference unit: radian meter second none 29. AC is used because: easy transmission cheap stable none 30. RMS power formula: VI cosφ VI I²R none Submit NEET UG Physics Notes – Alternating Current (Set 11) Alternating Current (AC) is a very important and scoring chapter in NEET UG Physics. It focuses on circuits where current and voltage vary with time. Questions are mostly formula-based + concept-based, especially involving phase relationships, reactance, resonance, and power. 1. Alternating Current (AC) Alternating current is the current that changes magnitude and direction periodically. Equation: I=I0sin⁡(ωt)I = I_0 \sin(\omega t)I=I0​sin(ωt) Where: 2. Frequency and Angular Frequency Frequency (f): Angular Frequency: ω=2πf\omega = 2\pi fω=2πf 3. RMS Value (Root Mean Square) RMS value represents the effective value of AC.Irms=I02,Vrms=V02I_{rms} = \frac{I_0}{\sqrt{2}}, \quad V_{rms} = \frac{V_0}{\sqrt{2}}Irms​=2​I0​​,Vrms​=2​V0​​ Importance: 4. Average Value of AC 5. Reactance Reactance is opposition offered by inductors and capacitors. Inductive Reactance: XL=ωLX_L = \omega LXL​=ωL Capacitive Reactance: XC=1ωCX_C = \frac{1}{\omega C}XC​=ωC1​ 6. Impedance (Z) Total opposition in AC circuit:Z=R2+(XL−XC)2Z = \sqrt{R^2 + (X_L – X_C)^2}Z=R2+(XL​−XC​)2​ Unit: 7. Phase Difference Resistor: Inductor: Capacitor: 8. Power in AC Circuit P=VIcos⁡ϕP = VI \cos\phiP=VIcosϕ Where: Power Factor: cos⁡ϕ\cos\phicosϕ 9. Power Factor Cases Circuit Power Factor Pure Resistor 1 Pure Inductor 0 Pure Capacitor 0 10. Resonance in RLC Circuit Condition: XL=XCX_L = X_CXL​=XC​ Resonant Frequency: f=12πLCf = \frac{1}{2\pi \sqrt{LC}}f=2πLC​1​ Key Points: 11. Energy Storage Inductor: U=12LI2U = \frac{1}{2}LI^2U=21​LI2 Capacitor: U=12CV2U = \frac{1}{2}CV^2U=21​CV2 12. AC Generator Working Principle: Function: 13. Transformer Principle: Voltage Ratio: VpVs=NpNs\frac{V_p}{V_s} = \frac{N_p}{N_s}Vs​Vp​​=Ns​Np​​ Core Material: 14. Advantages of AC ✔ Easy transmission over long distances✔ Can be stepped up/down using transformers✔ Lower power loss 15. Important NEET Formulas 16. Common Mistakes ❌ Confusing RMS and peak values❌ Forgetting phase differences❌ Mixing up reactance formulas❌ Ignoring power factor 17. Quick Revision Tips Conclusion Alternating Current is a formula-heavy but easy scoring chapter in NEET. Focus on: 👉 With strong basics, you can easily score full marks in AC questions.

Attempt all 30 MCQs and check your score instantly. 1. Faraday’s law states EMF is proportional to: dΦ/dt Φ I R 2. Unit of magnetic flux: Weber Tesla Volt Ampere 3. Lenz law gives: direction magnitude resistance current 4. Induced EMF formula: -dΦ/dt IR V none 5. Magnetic flux is: BA cosθ B/A A/B none 6. Self inductance unit: Henry Tesla Volt Ohm 7. Inductor opposes: change in current voltage resistance none 8. Energy stored in inductor: ½LI² LI I² none 9. Eddy currents are: induced currents direct current AC none 10. Fleming right hand rule gives: direction of induced current force voltage none 11. Mutual inductance depends on: geometry current voltage none 12. Transformer works on: mutual induction self induction Ohm law none 13. EMF induced due to motion is: motional EMF static EMF none zero 14. Motional EMF formula: Blv IR V none 15. Induced current direction by Lenz law: opposes cause supports cause random none 16. Inductance depends on: geometry current voltage none 17. Time constant (LR): L/R R/L LR none 18. Induced EMF sign negative due to: Lenz law Ohm law Newton law none 19. Transformer voltage ratio: Vp/Vs = Np/Ns Vs/Vp none zero 20. Efficiency of transformer: high low zero none 21. Back EMF is: opposing EMF aiding EMF zero none 22. Inductor behaves as: resistance to change capacitor conductor none 23. Magnetic energy stored depends on: current voltage resistance none 24. Eddy currents cause: heat loss gain zero none 25. Laminated core reduces: eddy currents voltage current none 26. Generator works on: EMI Ohm law motion none 27. Induced current exists when: flux changes constant flux zero flux none 28. Magnetic flux unit: Weber Tesla Volt none 29. Self induction occurs in: same coil different coil none zero 30. Mutual induction occurs in: two coils one coil none zero Submit NEET UG Physics Notes – Electromagnetic Induction (Set 10) Electromagnetic Induction (EMI) is a high-scoring and concept-based chapter in NEET UG Physics. It focuses on how changing magnetic fields produce electric currents. This chapter is very important because it forms the basis of generators, transformers, and many real-life electrical devices. 1. Magnetic Flux (Φ) Magnetic flux represents the total magnetic field passing through a surface.Φ=BAcos⁡θ\Phi = B A \cos\thetaΦ=BAcosθ Key Points: 2. Faraday’s Laws of Electromagnetic Induction First Law: Whenever magnetic flux linked with a circuit changes, an EMF is induced. Second Law: EMF=−dΦdt\text{EMF} = -\frac{d\Phi}{dt}EMF=−dtdΦ​ Important Insight: 3. Lenz’s Law Lenz’s law gives the direction of induced current. Statement: The induced current always opposes the cause producing it. Meaning: The negative sign in Faraday’s law represents this. 4. Motional EMF When a conductor moves in a magnetic field, EMF is induced.EMF=Blv\text{EMF} = B l vEMF=Blv Where: 5. Self Induction Self induction occurs when change in current in a coil induces EMF in the same coil.EMF=−LdIdt\text{EMF} = -L \frac{dI}{dt}EMF=−LdtdI​ Self Inductance (L): 6. Mutual Induction Occurs when change in current in one coil induces EMF in another coil.EMF=−MdIdt\text{EMF} = -M \frac{dI}{dt}EMF=−MdtdI​ Key Points: 7. Energy Stored in Inductor U=12LI2U = \frac{1}{2} L I^2U=21​LI2 Insight: 8. Eddy Currents Eddy currents are loops of induced currents in conductors. Effects: Applications: 9. Reduction of Eddy Currents Method: Reason: 10. Transformer A transformer transfers electrical energy using mutual induction. Voltage Ratio: VpVs=NpNs\frac{V_p}{V_s} = \frac{N_p}{N_s}Vs​Vp​​=Ns​Np​​ Types: Efficiency: 11. Back EMF Back EMF is induced EMF that opposes applied EMF. Occurs in: 12. Time Constant (LR Circuit) τ=LR\tau = \frac{L}{R}τ=RL​ Meaning: 13. Generator A generator converts mechanical energy into electrical energy. Principle: 14. Conditions for Induced Current Induced current exists only when: ✔ Magnetic field changes✔ Area changes✔ Angle changes 👉 If flux is constant → No induced current 15. Important NEET Concepts Must Remember: 16. Common Mistakes ❌ Ignoring negative sign (Lenz law)❌ Confusing flux with magnetic field❌ Forgetting conditions for induction❌ Mixing self and mutual induction 17. Quick Revision Tips Conclusion Electromagnetic Induction is a concept + formula-based chapter and very scoring in NEET. If you focus on: 👉 You can easily score full marks from this chapter.

Attempt all 30 MCQs and check your score instantly. 1. Magnetic force on charge is: qvB sinθ qE mv²/r IR 2. Unit of magnetic field: Tesla Volt Ampere Ohm 3. Direction of magnetic force: Fleming left Fleming right Lenz law Ohm law 4. Force on current carrying conductor: BIL sinθ qvB IR none 5. Motion of charge in uniform B (perpendicular): circular straight random none 6. Radius of circular motion: mv/qB qB/mv mv²/qB none 7. Cyclotron frequency: qB/2πm mv/qB qE/m none 8. Biot-Savart law gives: magnetic field electric field force voltage 9. Magnetic field around wire: concentric circles straight lines radial none 10. Ampere law relates: B & current E & charge V & I none 11. Magnetic field inside solenoid: uniform zero infinite none 12. Force between parallel currents: attract repel none zero 13. Torque on current loop: NIBA IR V none 14. Magnetic moment: IA IR V none 15. Earth acts like: magnet conductor insulator none 16. Magnetic dipole field varies as: 1/r³ 1/r² r constant 17. Lorentz force: q(E+v×B) IR mv² none 18. Magnetic field unit: Tesla Volt Joule none 19. Right hand thumb rule gives: direction of B current voltage none 20. Magnetic field due to loop: along axis radial zero none 21. Torque on dipole: MB sinθ IR qv none 22. Magnetic lines form: closed loops open lines straight none 23. Magnetic field at center of loop: μ₀I/2R μ₀I/R μ₀I/4R none 24. Solenoid field: μ₀nI μ₀I nI none 25. Magnetic force does: no work work infinite work none 26. Cyclotron works on: magnetic force gravity friction none 27. Velocity selector uses: E & B only E only B none 28. Magnetic permeability unit: H/m Tesla Volt none 29. Magnetic susceptibility: dimensionless unit Tesla none 30. Diamagnetic materials: weak repelled attracted strong attracted none Submit NEET UG Physics Notes – Magnetism & Moving Charges (Set 9) Magnetism and Moving Charges is a high-concept and moderately numerical chapter in NEET UG Physics. It combines ideas from electricity and motion, focusing on how moving charges create and experience magnetic fields. 1. Magnetic Force on Moving Charge A charged particle moving in a magnetic field experiences a force.F=qvBsin⁡θF = qvB \sin\thetaF=qvBsinθ Key Points: 2. Lorentz Force When both electric and magnetic fields are present:F=q(E+v×B)F = q(E + v \times B)F=q(E+v×B) Understanding: 3. Motion of Charged Particle in Magnetic Field Case 1: Perpendicular Motion r=mvqBr = \frac{mv}{qB}r=qBmv​T=2πmqBT = \frac{2\pi m}{qB}T=qB2πm​ Case 2: At an Angle Important Insight: 4. Cyclotron A device used to accelerate charged particles. Cyclotron Frequency: f=qB2πmf = \frac{qB}{2\pi m}f=2πmqB​ Principle: 5. Magnetic Field Due to Current Biot-Savart Law: Gives magnetic field due to a current element. Straight Wire: B=μ0I2πrB = \frac{\mu_0 I}{2\pi r}B=2πrμ0​I​ Circular Loop (Center): B=μ0I2RB = \frac{\mu_0 I}{2R}B=2Rμ0​I​ 6. Ampere’s Circuital Law ∮B⋅dl=μ0I\oint B \cdot dl = \mu_0 I∮B⋅dl=μ0​I Use: 7. Magnetic Field in Solenoid B=μ0nIB = \mu_0 n IB=μ0​nI Where: Key Feature: 8. Force Between Parallel Currents Formula: F∝I1I2rF \propto \frac{I_1 I_2}{r}F∝rI1​I2​​ 9. Magnetic Dipole A current loop behaves like a magnetic dipole. Magnetic Moment: M=IAM = IAM=IA Torque on Dipole: τ=MBsin⁡θ\tau = MB \sin\thetaτ=MBsinθ 10. Magnetic Field Lines Properties: 11. Earth’s Magnetism Key Terms: 12. Velocity Selector Uses crossed electric and magnetic fields. Condition for straight motion: qE=qvB⇒v=EBqE = qvB \Rightarrow v = \frac{E}{B}qE=qvB⇒v=BE​ 13. Magnetic Materials Diamagnetic: Paramagnetic: Ferromagnetic: 14. Magnetic Permeability μ=μ0μr\mu = \mu_0 \mu_rμ=μ0​μr​ Unit: 15. Magnetic Susceptibility χ=MH\chi = \frac{M}{H}χ=HM​ Key Point: 16. Important NEET Concepts Must Remember: 17. Common Mistakes ❌ Confusing electric force with magnetic force❌ Forgetting magnetic force does no work❌ Wrong direction using Fleming rule❌ Mixing formulas of electric and magnetic fields 18. Quick Revision Tips Conclusion Magnetism is a concept + formula-based chapter. NEET questions are mostly: If you master: 👉 You can score full marks easily in this chapter.

Attempt all 30 MCQs and check your score instantly. 1. Electric current is defined as: Charge/time Voltage/time Energy/time Power/time 2. SI unit of current: Ampere Volt Ohm Watt 3. Ohm’s law is: V=IR P=VI E=mc² F=ma 4. Resistance unit: Ohm Volt Ampere Joule 5. Resistivity depends on: Material Length Area Shape 6. Resistance formula: ρL/A L/ρA A/ρL ρA/L 7. Current density is: I/A V/I IR P/V 8. Drift velocity is proportional to: Electric field Temperature Resistance Mass 9. Mobility is: v/E E/v I/V V/I 10. Ohmic conductor obeys: linear V-I nonlinear exponential none 11. Power formula: VI IR V/R I/V 12. Joule law: I²Rt IR V² none 13. Series resistance: add decrease multiply none 14. Parallel resistance: decrease increase same none 15. EMF is: energy/charge force current resistance 16. Internal resistance affects: current voltage only power only none 17. Terminal voltage: E – Ir E + Ir IR none 18. Kirchhoff’s law is based on: conservation laws motion gravity none 19. Wheatstone bridge condition: P/Q=R/S P+Q PQ none 20. Potentiometer measures: EMF current resistance power 21. Resistivity unit: Ωm Ohm Volt Ampere 22. Conductivity is: 1/ρ ρ R none 23. Temperature effect on metals: resistance increases decreases constant zero 24. Superconductors have: zero resistance high resistance variable resistance none 25. Electric power unit: Watt Volt Ampere Ohm 26. Energy unit: Joule Watt Volt Ampere 27. Ammeter resistance: low high infinite zero 28. Voltmeter resistance: high low zero none 29. Drift velocity increases with: electric field resistance length area 30. Ohm’s law valid for: metals semiconductors diodes none Submit NEET UG Physics Notes – Current Electricity (Set 8) Current Electricity is a high-scoring and formula-based chapter in NEET UG Physics. It is very important because it involves direct formula application, conceptual clarity, and numerical solving. This chapter also connects with practical applications like circuits, meters, and electrical devices. 1. Electric Current Electric current is the rate of flow of electric charge.I=QtI = \frac{Q}{t}I=tQ​ Key Points: 2. Ohm’s Law Ohm’s law states that current through a conductor is directly proportional to voltage.V=IRV = IRV=IR Important Insights: 3. Resistance (R) Resistance is the opposition offered to current flow.R=VIR = \frac{V}{I}R=IV​ Factors Affecting Resistance: R=ρLAR = \rho \frac{L}{A}R=ρAL​ 4. Resistivity (ρ) Definition: Property of a material that determines resistance. Key Points: 5. Conductivity (σ) σ=1ρ\sigma = \frac{1}{\rho}σ=ρ1​ Insight: 6. Current Density (J) J=IAJ = \frac{I}{A}J=AI​ Relation: J=nqvdJ = nqv_dJ=nqvd​ 7. Drift Velocity Drift velocity is the average velocity of electrons under electric field.vd∝Ev_d \propto Evd​∝E Important Concept: 8. Mobility (μ) μ=vdE\mu = \frac{v_d}{E}μ=Evd​​ Meaning: 9. Electric Power P=VIP = VIP=VI Other Forms: P=I2R=V2RP = I^2R = \frac{V^2}{R}P=I2R=RV2​ Unit: 10. Heating Effect of Current (Joule’s Law) H=I2RtH = I^2RtH=I2Rt Applications: 11. Combination of Resistances Series Combination: R=R1+R2+R3R = R_1 + R_2 + R_3R=R1​+R2​+R3​ Parallel Combination: 1R=1R1+1R2\frac{1}{R} = \frac{1}{R_1} + \frac{1}{R_2}R1​=R1​1​+R2​1​ 12. EMF and Potential Difference EMF (E): Terminal Voltage: V=E−IrV = E – IrV=E−Ir Where: 13. Internal Resistance Definition: Resistance inside a cell. Effect: 14. Kirchhoff’s Laws 1. Junction Law (Current Law): ∑I=0\sum I = 0∑I=0 2. Loop Law (Voltage Law): ∑V=0\sum V = 0∑V=0 15. Wheatstone Bridge Used to measure unknown resistance. Balanced Condition: PQ=RS\frac{P}{Q} = \frac{R}{S}QP​=SR​ Key Feature: 16. Potentiometer Uses: Advantage: 17. Temperature Effect Metals: Semiconductors: 18. Superconductors Key Property: Applications: 19. Measuring Instruments Ammeter: Voltmeter: 20. Important NEET Tips Must Remember: 21. Common Mistakes ❌ Confusing resistivity with resistance❌ Using wrong formula for series/parallel❌ Ignoring internal resistance❌ Not converting units properly Conclusion Current Electricity is one of the easiest scoring chapters in NEET if concepts are clear. Focus on: 👉 Most questions are direct and formula-based, so strong fundamentals can guarantee full marks.

Attempt all 30 MCQs below and check your score instantly with detailed explanations. 1. Coulomb’s law states force is proportional to: 1/r² r² r constant 2. SI unit of electric field is: N/C Volt Joule Watt 3. Electric field due to point charge is: kq/r² kqr² q/r r/q 4. Electric potential is: Work/charge Charge/work Force/charge Energy 5. Unit of electric potential: Volt Ampere Joule Watt 6. Work done in moving charge depends on: Path Initial point Final point Both b & c 7. Electric field inside conductor is: Zero Maximum Infinite Constant 8. Gauss law relates: Charge & flux Force & mass Energy & work Current 9. Electric flux unit is: Nm²/C Volt Ampere Joule 10. Capacitance is defined as: Q/V V/Q QV V² 11. Unit of capacitance: Farad Volt Ampere Joule 12. Energy stored in capacitor: ½CV² CV V² QV 13. Capacitance increases with: Area Distance Charge None 14. Parallel plate capacitor depends on: Area & distance Charge only Voltage Time 15. Dielectric increases capacitance by: k times decreases zero none 16. Electric dipole moment is: q×d q/d d/q q+d 17. Field of dipole varies as: 1/r³ 1/r² r constant 18. Torque on dipole is: pE sinθ pE cosθ pE zero 19. Potential due to dipole varies as: 1/r² 1/r³ r constant 20. Electric lines of force: never cross cross circular none 21. Field at center of charged ring: zero max infinite constant 22. Equipotential surface: constant V varying V zero infinite 23. Potential energy of charge: qV V/q q/V none 24. Relation between E and V: E = -dV/dr V = Ed E = V none 25. Work done in closed path: zero max infinite constant 26. Electric field direction: + to – – to + random none 27. Capacitance in series: decreases increases same zero 28. Capacitance in parallel: increases decreases zero same 29. Breakdown occurs due to: high voltage low voltage zero voltage none 30. Permittivity unit: F/m N Volt Joule Submit NEET UG Physics Notes – Electrostatics (Set 7) Electrostatics is a high-weightage and concept-driven topic in NEET UG Physics. It forms the foundation for later topics like current electricity, capacitance, and electromagnetism. The questions in this set cover Coulomb’s law, electric field, potential, capacitance, Gauss law, and dipole concepts. 1. Coulomb’s Law Coulomb’s law describes the force between two point charges.F=kq1q2r2F = k \frac{q_1 q_2}{r^2}F=kr2q1​q2​​ Key Points: 2. Electric Field (E) Electric field is the force experienced per unit charge.E=FqE = \frac{F}{q}E=qF​ For a point charge:E=kqr2E = k \frac{q}{r^2}E=kr2q​ Important Concepts: 3. Electric Potential (V) Electric potential is the work done per unit charge.V=WqV = \frac{W}{q}V=qW​ For a point charge:V=kqrV = k \frac{q}{r}V=krq​ Key Insights: 4. Relation Between Electric Field and Potential E=−dVdrE = -\frac{dV}{dr}E=−drdV​ Meaning: 5. Electric Flux and Gauss’s Law Electric Flux: Φ=EAcos⁡θ\Phi = EA \cos\thetaΦ=EAcosθ Gauss Law: Φ=qencε0\Phi = \frac{q_{enc}}{\varepsilon_0}Φ=ε0​qenc​​ Applications: 6. Electric Field Lines Properties: 7. Equipotential Surfaces Surfaces where potential is constant. Important Facts: 8. Electric Dipole A system of two equal and opposite charges separated by distance. Dipole Moment: p=q×dp = q \times dp=q×d Electric Field: Torque on Dipole: τ=pEsin⁡θ\tau = pE \sin\thetaτ=pEsinθ 9. Capacitance Capacitance is ability to store charge.C=QVC = \frac{Q}{V}C=VQ​ Parallel Plate Capacitor: C=ε0AdC = \frac{\varepsilon_0 A}{d}C=dε0​A​ Where: 10. Effect of Dielectric If dielectric is inserted:C=kε0AdC = k \frac{\varepsilon_0 A}{d}C=kdε0​A​ Key Points: 11. Energy Stored in Capacitor U=12CV2U = \frac{1}{2}CV^2U=21​CV2 Other Forms: U=Q22C=12QVU = \frac{Q^2}{2C} = \frac{1}{2}QVU=2CQ2​=21​QV 12. Combination of Capacitors Series: 1C=1C1+1C2\frac{1}{C} = \frac{1}{C_1} + \frac{1}{C_2}C1​=C1​1​+C2​1​ Parallel: C=C1+C2C = C_1 + C_2C=C1​+C2​ 13. Potential Energy U=qVU = qVU=qV Important Insight: 14. Work Done in Electric Field W=q(V1−V2)W = q(V_1 – V_2)W=q(V1​−V2​) 15. Breakdown of Dielectric When electric field exceeds limit: 16. Permittivity ε0\varepsilon_0ε0​ Unit: F/mF/mF/m Role: 17. Important Exam Tips Must Remember: 18. Common Mistakes to Avoid ❌ Confusing electric field with potential❌ Ignoring negative sign in E=−dV/drE = -dV/drE=−dV/dr❌ Mixing up series and parallel capacitor formulas❌ Forgetting units Conclusion Electrostatics is formula-driven but concept-heavy. Most NEET questions are: If you master: 👉 You can easily score full marks in this chapter.

NEET UG Physics Practice Paper – Part 6 (Modern Physics) Submit NEET UG Physics Notes – Modern Physics (Part 6) Modern Physics is one of the most scoring and conceptually rich sections for NEET UG. The questions in this quiz primarily revolve around photoelectric effect, atomic models, nuclear physics, and radiation phenomena. Understanding the core principles behind these topics is essential for solving both theoretical and numerical questions efficiently. 1. Photoelectric Effect The photoelectric effect explains the emission of electrons from a metal surface when light of sufficient frequency falls on it. This phenomenon strongly supports the particle nature of light. Key Concepts: Important Observations: 2. Photon Theory of Light According to Planck’s quantum theory: This explains phenomena like: 3. Dual Nature of Matter Louis de Broglie proposed that matter also behaves like waves. De Broglie Wavelength: λ=hp=hmv\lambda = \frac{h}{p} = \frac{h}{mv}λ=ph​=mvh​ Experimental Proof: Implication: 4. Bohr’s Atomic Model Bohr proposed a model for hydrogen atom explaining discrete energy levels. Key Postulates: Bohr Radius: rn∝n2r_n \propto n^2rn​∝n2 Spectral Lines: 5. Atomic Spectra When electrons transition between energy levels, photons are emitted or absorbed. Types of Spectra: Reason: Energy difference between levels:ΔE=hf\Delta E = hfΔE=hf 6. Nuclear Structure The nucleus consists of protons and neutrons (nucleons). Nuclear Radius: R=R0A1/3R = R_0 A^{1/3}R=R0​A1/3 Where: 7. Mass Defect and Binding Energy Mass Defect: Difference between actual mass of nucleus and sum of individual nucleon masses. Binding Energy: Energy required to break nucleus into individual nucleons.E=Δm c2E = \Delta m \, c^2E=Δmc2 Importance: 8. Radioactive Decay Radioactive substances decay spontaneously. Decay Law: N=N0e−λtN = N_0 e^{-\lambda t}N=N0​e−λt Where: Half-Life: T1/2=0.693λT_{1/2} = \frac{0.693}{\lambda}T1/2​=λ0.693​ Activity: A=λNA = \lambda NA=λN 9. Types of Radioactive Decay Alpha Decay (α): Beta Decay (β): Gamma Decay (γ): 10. Nuclear Reactions Nuclear Fission: Nuclear Fusion: 11. Energy Production in the Sun The Sun produces energy through nuclear fusion, primarily:4H→He+energy4H \rightarrow He + energy4H→He+energy Key Points: 12. Rutherford’s Atomic Model Rutherford’s gold foil experiment concluded: 13. Fundamental Particles Electron: Proton: Neutron: 14. Mass-Energy Equivalence Einstein’s famous relation:E=mc2E = mc^2E=mc2 Implication: 15. Important Exam Insights Frequently Tested Concepts: Common Mistakes: Conclusion Modern Physics is a high-yield, formula-based, and concept-driven topic for NEET UG. Most questions are direct applications of formulas or conceptual understanding rather than lengthy calculations. By mastering: you can easily secure full marks in this section. Focus on understanding why phenomena occur, not just memorizing formulas. This will help you tackle tricky conceptual questions with confidence.

NEET UG – Physics Practice Paper – Thermodynamics (Part 5) Total Questions: 30 | +4 Marks for Correct Answer | No Negative Marking 1. SI unit of temperature is: Kelvin Celsius Fahrenheit Joule 2. Absolute zero temperature is: 0 K -273°C Both None 3. Heat flows from: High to low temperature Low to high Both None 4. SI unit of heat is: Joule Calorie Watt Kelvin 5. Specific heat capacity unit is: J/kg·K J/K J/kg K 6. First law of thermodynamics is: Q = ΔU + W Q = W – ΔU Q = ΔU Q = W 7. Internal energy depends on: Temperature Volume Pressure None 8. Work done in isothermal process is: Non-zero Zero Infinite Constant 9. In isochoric process: Volume constant Pressure constant Temperature constant None 10. In isobaric process: Pressure constant Volume constant Temperature constant None 11. Efficiency of heat engine is: W/Q₁ Q₁/W Q₂/W None 12. Carnot engine efficiency depends on: Temperature Pressure Volume None 13. Ideal gas equation: PV = nRT PV = RT P = nRT V = nRT 14. SI unit of pressure: Pascal Joule Watt Newton 15. Heat capacity is: Q/ΔT ΔT/Q Q×T None 16. Second law of thermodynamics states: Heat cannot flow from cold to hot without work Energy conserved Work done is zero None 17. Entropy unit: J/K J K W 18. Adiabatic process means: No heat exchange Heat exchange Temperature constant Pressure constant 19. Work done in isochoric process: Zero Maximum Minimum Infinite 20. Work done in isobaric process: PΔV VΔP PV None 21. Ideal gas molecules have: No interaction Strong interaction Weak interaction None 22. RMS speed depends on: Temperature Pressure Volume None 23. Temperature is measure of: Average kinetic energy Potential energy Pressure Volume 24. Heat engine converts: Heat to work Work to heat Heat to temperature None 25. Refrigerator works on: Reverse heat engine Heat engine Generator None 26. COP of refrigerator is: Q₂/W W/Q₁ Q₁/W None 27. Boyle’s law states: P ∝ 1/V V ∝ T P ∝ T None 28. Charles law: V ∝ T P ∝ T P ∝ V None 29. Avogadro law: V ∝ n P ∝ n T ∝ n None 30. SI unit of gas constant R is: J/mol·K J/K J/mol K/mol Submit Answers Detailed Notes for NEET UG Physics Practice Paper (Thermodynamics – Part 5) Thermodynamics is one of the most concept-driven and scoring sections in NEET Physics. The questions in this practice paper focus on building a strong foundation in thermal physics, including temperature, heat transfer, laws of thermodynamics, gas laws, and heat engines. Understanding these concepts deeply is essential because thermodynamics is not just about formulas—it is about interpreting physical processes and energy transformations. Temperature and Its Measurement Temperature is a fundamental concept in thermodynamics and is measured in Kelvin (K) in the SI system. The Kelvin scale is an absolute scale, meaning it starts from absolute zero, the lowest possible temperature. Absolute zero is: At this temperature, the molecular motion is minimum. In NEET, students must understand the relationship between Celsius and Kelvin:T(K)=T(∘C)+273T(K) = T(^\circ C) + 273T(K)=T(∘C)+273 This conversion is frequently used in numerical problems. Heat and Heat Transfer Heat is a form of energy transfer that occurs due to a temperature difference. Its SI unit is Joule (J). A key principle tested in the quiz is: There are three modes of heat transfer: Although not directly asked in basic MCQs, these concepts are important for conceptual clarity. Specific Heat Capacity Specific heat capacity is defined as the amount of heat required to raise the temperature of 1 kg of a substance by 1 Kelvin.c=QmΔTc = \frac{Q}{m\Delta T}c=mΔTQ​ Its unit is:J/kg⋅KJ/kg·KJ/kg⋅K This concept is important in problems involving heat exchange and calorimetry. First Law of Thermodynamics The first law is a statement of energy conservation:Q=ΔU+WQ = \Delta U + WQ=ΔU+W Where: This law connects heat, work, and internal energy, forming the backbone of thermodynamics. Internal Energy Internal energy refers to the total energy contained within a system due to molecular motion and interactions. For an ideal gas, internal energy depends only on temperature, not on pressure or volume. This concept is crucial because it simplifies many thermodynamic calculations. Thermodynamic Processes The quiz includes questions on different thermodynamic processes, each with unique characteristics: 1. Isothermal Process (Temperature Constant) 2. Isochoric Process (Volume Constant) 3. Isobaric Process (Pressure Constant) 4. Adiabatic Process Understanding these processes is essential for solving NEET problems involving PV diagrams and heat calculations. Second Law of Thermodynamics The second law introduces the concept of direction of processes. One common statement is: This law explains why certain processes are irreversible and introduces the concept of entropy. Entropy Entropy is a measure of disorder or randomness in a system. Its unit is:J/KJ/KJ/K In natural processes, entropy tends to increase. This concept is important for understanding the efficiency of heat engines and the direction of thermodynamic processes. Heat Engines and Efficiency A heat engine converts heat energy into mechanical work. The efficiency of a heat engine is given by:η=WQ1\eta = \frac{W}{Q_1}η=Q1​W​ Where: Efficiency is always less than 100% due to energy losses. Carnot Engine The Carnot engine is an ideal heat engine with maximum efficiency. Its efficiency depends only on the temperatures of the hot and cold reservoirs:η=1−T2T1\eta = 1 – \frac{T_2}{T_1}η=1−T1​T2​​ This shows that efficiency increases with a greater temperature difference. Refrigerators and Coefficient of Performance (COP) A refrigerator works as a reverse heat engine, transferring heat from a cold region to a hot region. The coefficient of performance (COP) is:COP=Q2WCOP = \frac{Q_2}{W}COP=WQ2​​ Where: Understanding COP is important for practical applications. Ideal Gas Equation The ideal gas equation is one of the most important equations in thermodynamics:PV=nRTPV = nRTPV=nRT Where: This equation combines all gas laws into a single relation. Gas Laws The quiz includes three fundamental gas laws: Boyle’s Law P∝1VP \propto \frac{1}{V}P∝V1​ (At constant temperature) Charles’s Law V∝TV \propto TV∝T (At constant pressure) Avogadro’s Law V∝nV \propto nV∝n These laws are frequently used in NEET numerical problems. Kinetic Theory of