NEET UG Physics Practice Paper – Dual Nature & Atoms (Set 14) Attempt all 30 MCQs and check your score instantly. 1. Photoelectric effect proves: particle nature wave nature dual nature none 2. Einstein photoelectric equation: hf = KE + φ V=IR F=ma none 3. Threshold frequency depends on: material intensity wavelength none 4. Kinetic energy depends on: frequency intensity material none 5. De Broglie wavelength: h/p p/h hv none 6. Wave nature of electron proved by: Davisson-Germer Rutherford Bohr none 7. Bohr radius ∝: n² n 1/n none 8. Energy levels in atom: discrete continuous random none 9. Ionization energy: remove electron add electron move electron none 10. Spectral lines due to: transitions collisions motion none 11. Photon energy: hf h/v hv² none 12. Photon momentum: h/λ λ/h hv none 13. Work function is: minimum energy max energy zero none 14. Stopping potential depends on: frequency intensity material none 15. Mass-energy relation: E=mc² V=IR F=ma none 16. Electron charge: -1.6×10⁻¹⁹ C +1.6×10⁻¹⁹ C 0 none 17. Electron mass: 9.1×10⁻³¹ kg 10⁻²⁷ 10⁻²³ none 18. Energy levels depend on: n mass charge none 19. Frequency of emitted photon: ΔE/h h/ΔE none zero 20. Hydrogen spectrum: line spectrum continuous none zero 21. Atomic model by Bohr: quantized orbits random none zero 22. Electron transition: photon emission absorption none zero 23. De Broglie applies to: all particles only electrons only photons none 24. Wave nature visible for: small particles large bodies both none 25. Photon has: zero mass mass charge none 26. Photon speed: c v none zero 27. Photoelectric current depends on: intensity frequency material none 28. KE max formula: hf-φ φ-hf hf none 29. Energy quantization means: discrete continuous none zero 30. Planck constant unit: J·s J s none Submit NEET UG Physics Notes – Dual Nature of Matter & Radiation + Atoms (Set 14) This combined revision chapter is extremely important for NEET UG, as it covers modern physics, which is one of the most scoring areas. Questions are generally direct, formula-based, and conceptual, making it easier to secure marks with proper clarity. 1. Dual Nature of Radiation Light shows dual nature: 2. Photoelectric Effect When light falls on a metal surface, electrons are emitted. Key Observations: 3. Einstein’s Photoelectric Equation hf=KEmax+ϕhf = KE_{max} + \phihf=KEmax​+ϕ Where: 4. Work Function (φ) Minimum energy required to remove an electron.ϕ=hf0\phi = h f_0ϕ=hf0​ Depends on: 5. Stopping Potential Stopping potential is the potential needed to stop the fastest electrons.eV0=KEmaxeV_0 = KE_{max}eV0​=KEmax​ Important: 6. Effect of Intensity 7. Photon Light consists of particles called photons. Properties: 8. De Broglie Hypothesis All particles have wave nature.λ=hp\lambda = \frac{h}{p}λ=ph​ Important Insight: 9. Davisson-Germer Experiment 10. Bohr’s Model of Atom Postulates: 11. Radius of Orbit rn∝n2r_n \propto n^2rn​∝n2 Meaning: 12. Energy of Electron En=−13.6n2 eVE_n = -\frac{13.6}{n^2} \, \text{eV}En​=−n213.6​eV Key Insight: 13. Spectral Lines Produced due to electron transitions between energy levels. Frequency: ν=ΔEh\nu = \frac{\Delta E}{h}ν=hΔE​ 14. Hydrogen Spectrum Hydrogen emits line spectrum. Series: 15. Ionization Energy Energy required to remove electron from ground state. For Hydrogen: 16. Energy Transitions 17. Mass-Energy Relation E=mc2E = mc^2E=mc2 Importance: 18. Important NEET Formulas 19. Common Mistakes ❌ Thinking intensity affects kinetic energy❌ Forgetting threshold frequency condition❌ Mixing photon energy and electron energy❌ Ignoring units (eV, J, etc.) 20. Quick Revision Tips Conclusion Dual Nature and Atoms is a high-scoring and easy chapter in NEET. Focus on: 👉 With proper understanding, you can secure full marks from modern physics.

NEET UG Physics Practice Paper – Wave Optics (Set 13) Attempt all 30 MCQs and check your score instantly. 1. Interference occurs due to: superposition reflection refraction none 2. Constructive interference condition: path difference = nλ nλ/2 zero only none 3. Destructive interference: (2n+1)λ/2 nλ λ none 4. Young’s double slit experiment shows: wave nature particle dual none 5. Fringe width formula: λD/d D/λd λ/d none 6. Coherent sources have: same phase same amplitude same speed none 7. Diffraction occurs due to: bending of light reflection refraction none 8. Single slit diffraction minimum: a sinθ = nλ λ/a none zero 9. Central maximum is: widest narrow same none 10. Polarization proves: transverse nature longitudinal both none 11. Brewster angle formula: tanθ = n sinθ cosθ none 12. Fringe width increases with: wavelength slit width none zero 13. Fringe width decreases with: slit separation wavelength D none 14. Diffraction depends on: wavelength speed charge none 15. Coherence requires: fixed phase variable phase none zero 16. Fringe width unit: meter second Hz none 17. Light speed in vacuum: 3×10⁸ m/s 10⁶ 10⁵ none 18. Interference fringes are: equally spaced random unequal none 19. Diffraction pattern central maxima: brightest dim zero none 20. Path difference unit: meter second Hz none 21. Polarizer reduces intensity: yes no infinite none 22. Unpolarized light: random vibrations fixed none zero 23. Intensity ∝ amplitude: square linear none zero 24. Wavelength unit: meter second Hz none 25. Diffraction prominent when: slit ~ wavelength slit large none zero 26. Phase difference unit: radian meter second none 27. Interference requires: coherence reflection none zero 28. Diffraction pattern width: inversely slit direct slit none zero 29. Light nature: wave particle dual none 30. Interference intensity max when: waves in phase out phase none zero Submit NEET UG Physics Notes – Wave Optics (Set 13) Wave Optics is a concept-heavy and highly scoring chapter in NEET UG Physics. It explains the wave nature of light through phenomena like interference, diffraction, and polarization. Questions are usually direct formula-based or concept-based, making it a reliable scoring area. 1. Wave Nature of Light Light behaves as a wave in many phenomena. Key Evidence: 2. Principle of Superposition When two waves overlap, their displacements add up. Result: 3. Interference of Light Interference is the redistribution of intensity due to superposition. 4. Conditions for Interference Constructive Interference: Path difference=nλ\text{Path difference} = n\lambdaPath difference=nλ Destructive Interference: Path difference=(2n+1)λ2\text{Path difference} = \frac{(2n+1)\lambda}{2}Path difference=2(2n+1)λ​ 5. Young’s Double Slit Experiment (YDSE) Important Formula: β=λDd\beta = \frac{\lambda D}{d}β=dλD​ Where: Key Observations: 6. Coherent Sources Sources are coherent if: 7. Factors Affecting Fringe Width β∝λDd\beta \propto \frac{\lambda D}{d}β∝dλD​ Increases with: Decreases with: 8. Diffraction of Light Diffraction is bending of light around obstacles. Key Condition: 9. Single Slit Diffraction Minima Condition: asin⁡θ=nλa \sin\theta = n\lambdaasinθ=nλ Important Feature: 10. Difference Between Interference & Diffraction Feature Interference Diffraction Source Two sources Single slit Fringes Equal width Unequal Intensity Same Decreasing 11. Polarization of Light Polarization restricts light vibrations to one plane. Conclusion: 12. Polarizers Devices that produce polarized light. Effect: 13. Brewster’s Law tan⁡θB=n\tan\theta_B = ntanθB​=n At Brewster Angle: 14. Intensity of Light I∝A2I \propto A^2I∝A2 Where: 15. Path Difference and Phase Difference Δϕ=2πλ×path difference\Delta \phi = \frac{2\pi}{\lambda} \times \text{path difference}Δϕ=λ2π​×path difference Units: 16. Diffraction Pattern Features 17. Important NEET Formulas 18. Common Mistakes ❌ Confusing interference and diffraction❌ Forgetting coherence condition❌ Mixing constructive & destructive formulas❌ Ignoring units 19. Quick Revision Tips Conclusion Wave Optics is a high-yield and conceptual chapter. Focus on: 👉 With proper understanding, you can easily score full marks in this chapter.

NEET UG Physics Notes – Ray Optics (Set 12) Ray Optics is one of the most important and scoring chapters in NEET UG Physics. It deals with the behavior of light in terms of rays and includes concepts like reflection, refraction, lenses, mirrors, prisms, and optical instruments. Questions are mostly formula-based and conceptual, making it a high-scoring topic. 1. Reflection of Light Reflection occurs when light bounces back from a surface. Laws of Reflection: 2. Types of Mirrors Plane Mirror: Concave Mirror: Convex Mirror: 3. Mirror Formula 1f=1v+1u\frac{1}{f} = \frac{1}{v} + \frac{1}{u}f1​=v1​+u1​ Magnification: m=vum = \frac{v}{u}m=uv​ 4. Refraction of Light Refraction is bending of light when it passes from one medium to another due to change in speed. 5. Snell’s Law n1sin⁡θ1=n2sin⁡θ2n_1 \sin\theta_1 = n_2 \sin\theta_2n1​sinθ1​=n2​sinθ2​ Refractive Index: n=cvn = \frac{c}{v}n=vc​ 6. Total Internal Reflection (TIR) Occurs when light travels from denser to rarer medium and: Critical Angle Condition: sin⁡C=1n\sin C = \frac{1}{n}sinC=n1​ Applications: 7. Lenses Convex Lens: Concave Lens: 8. Lens Formula 1f=1v−1u\frac{1}{f} = \frac{1}{v} – \frac{1}{u}f1​=v1​−u1​ Magnification: m=vum = \frac{v}{u}m=uv​ 9. Power of Lens P=1fP = \frac{1}{f}P=f1​ Unit: Lens Combination: Ptotal=P1+P2P_{total} = P_1 + P_2Ptotal​=P1​+P2​ 10. Image Formation Real Image: Virtual Image: 11. Prism A prism refracts light and causes deviation. Angle of Deviation: Minimum Deviation: 12. Dispersion of Light Splitting of white light into its component colors. Order: Key Points: 13. Speed of Light in Medium v=cnv = \frac{c}{n}v=nc​ Insight: 14. Optical Fiber Works on Total Internal Reflection Uses: 15. Important NEET Formulas 16. Common Mistakes ❌ Confusing mirror and lens formulas❌ Wrong sign convention❌ Forgetting TIR conditions❌ Mixing real and virtual images 17. Quick Revision Tips Conclusion Ray Optics is a high-weightage and easy scoring chapter if concepts are clear. Focus on: 👉 With proper practice, you can score full marks in this chapter.

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.