Scoring top marks in the Tamil Nadu Class 12 (Higher Secondary Second Year / Plus Two) Science examinations demands conceptual precision, systematic derivation mastery in Physics, and thorough reaction mechanism practice in Chemistry. Higher secondary students aiming for top cut-offs in engineering (TNEA), medicine (NEET), and university degrees should maintain a balanced revision strategy across all group subjects including Part-I Language (Tamil), Part-II English, Mathematics (கணிதம்), Physics, Chemistry, Biology & Computer Science, and Commerce & Accountancy via our dedicated 12th Plus Two Study Materials Hub.
For both Physics and Chemistry, the state board theory paper carries 70 marks, supported by 20 practical marks and 10 internal assessment marks, totaling 100 marks per subject. Passing requires a minimum of 15 marks out of 70 in theory with an overall subject aggregate of 35 marks. However, scoring above 95 marks requires mastering the recurring “Golden Questions” — the vital 2-mark definitions, 3-mark analytical problems, and 5-mark extended derivations that appear consistently across district revision and board public examinations. Students can consult official theory from our Samacheer Kalvi 12th Standard Textbooks, track exam dates on the TN 12th Public Exam Time Table 2027 and TN Half Yearly Exam Time Table, and practice with our 12th Plus Two Question Papers Archive and 12th PTA Question Bank (6 Sets). This guide presents the Volume 1 & Volume 2 Golden Questions and verified answer keys in PDF format.
தமிழ்நாடு 12-ஆம் வகுப்பு (+2 / Plus Two) இயற்பியல் மற்றும் வேதியியல் (Physics & Chemistry) — தொகுதி 1 மற்றும் 2 பாடங்களுக்கான மிக முக்கியமான கோல்டன் வினாக்கள் (Golden Questions), 2, 3, 5 மதிப்பெண் வினா-விடைகள் PDF தொகுப்பு கீழே கொடுக்கப்பட்டுள்ளது.
📥 Download 12th Physics & Chemistry Golden Questions: Access Volume 1 & 2 derivations, named reactions & PTA model papers → 12th Science Study Materials Hub | 12th PTA Question Bank | 12th Textbooks PDF | 12th Question Papers Archive.
Overview
| Applicable Class & Stream | Class 12 (Plus Two / HSC Second Year) • Science Group |
|---|---|
| Covered Subjects | Physics (இயற்பியல்) & Chemistry (வேதியியல்) |
| Syllabus & Curriculum | Tamil Nadu State Board (Samacheer Kalvi Volume 1 & 2) |
| Medium of Instruction | English Medium (EM) & Tamil Medium (TM) |
| Theory Written Examination | 70 Marks (Time: 3 Hours • Min. Pass Mark: 15/70) |
| Practical & Internal Score | 20 Marks Practical + 10 Marks Internal (30 Marks total) |
| Total Subject Marks | 100 Marks (Aggregate passing requirement: 35/100) |
| Question Blueprint | Part I: 15 MCQs (15M) • Part II: 6/9 x 2M (12M) • Part III: 6/9 x 3M (18M) • Part IV: 5/5 x 5M with internal choice (25M) |
| Compulsory Questions | Q.No. 24 (2-Mark Problem) and Q.No. 33 (3-Mark Problem) |
| Download Resource Formats | Free Printable Unit-Wise Golden Question PDFs with Solved Answer Keys |
TN 12th Physics & Chemistry Exam Blueprint (70 Marks Theory)
Both Physics and Chemistry share the exact same structural blueprint under the Tamil Nadu Directorate of Government Examinations (DGE) evaluation scheme:
| Section / Part | Question Category | Total Questions | To Answer | Mark Allocation | Total Section Marks |
|---|---|---|---|---|---|
| Part I | Multiple Choice Questions (MCQs) | 15 Questions | 15 (All compulsory) | 1 Mark each | 15 Marks |
| Part II | Short Answer Questions | 9 Questions | 6 (Q.24 Compulsory) | 2 Marks each | 12 Marks |
| Part III | Brief Analytical Questions | 9 Questions | 6 (Q.33 Compulsory) | 3 Marks each | 18 Marks |
| Part IV | Long Derivations / Comprehensive | 5 Questions | 5 (Either / Or Choice) | 5 Marks each | 25 Marks |
| Total | DGE Board Theory Paper | 38 Questions | 32 Questions | — | 70 Marks |
Passing Requirement: Candidates must secure at least 15 marks out of 70 in the theory examination. However, for engineering (TNEA) and university ranking cut-offs, students aim for 65+ marks in theory.
12th Physics Volume 1 & 2 Top Golden Questions
Physics questions in the Tamil Nadu board exam are divided into conceptual definitions, ray/circuit diagrams, and rigorous mathematical derivations.
Top 5-Mark Golden Derivations (Physics Volume 1 & 2)
- Unit 1 (Electrostatics): Calculate electric field due to an electric dipole at points on the axial line and equatorial line.
- Unit 1 (Electrostatics): State Gauss’s Law and apply it to find the electric field due to an infinitely long straight wire and uniformly charged spherical shell.
- Unit 1 (Electrostatics): Principle, construction, and working of Van de Graaff Generator with labelled schematic diagram.
- Unit 2 (Current Electricity): Obtain the condition for bridge balance in Wheatstone’s Bridge using Kirchhoff’s laws (P/Q = R/S).
- Unit 3 (Magnetism & Magnetic Effects): Apply Biot-Savart law to derive the magnetic induction at a point on the axis of a circular current-carrying coil.
- Unit 3 (Magnetism & Magnetic Effects): Working principle and construction of Cyclotron, with resonance condition and limitation formulas.
- Unit 4 (Electromagnetic Induction & AC): Show that the average power consumed over a complete cycle in a series RLC circuit is P = Vrms Irms cosφ.
- Unit 6 (Optics): Derive the Mirror Equation (1/f = 1/v + 1/u) and obtain the expression for lateral magnification.
- Unit 6 (Optics): Derive the Lens Maker’s Formula (1/f = (μ − 1)(1/R1 − 1/R2)) with sign conventions.
- Unit 9 (Semiconductors): Working of Full-Wave Rectifier with circuit diagram, input/output waveforms, and efficiency calculation.
Top 2-Mark & 3-Mark Recurring Conceptual Questions (Physics)
- Define Electric Flux and state its SI unit: The number of electric field lines crossing a given area held normal to the lines of force (ΦE = E • A). Unit: N•m²/C or V•m.
- State Kirchhoff’s Current Law (KCL) and Voltage Law (KVL): KCL represents conservation of charge (ΣI = 0); KVL represents conservation of energy (ΣIR = ΣΕ).
- State Curie’s Law in Magnetism: Susceptibility of a paramagnetic material is inversely proportional to its absolute temperature: χm = C / T.
- State Faraday’s Laws of Electromagnetic Induction: The magnitude of induced EMF is directly proportional to the rate of change of magnetic flux linkage: ε = −dΦB/dt.
- State Brewster’s Law: The tangent of the polarizing angle is numerically equal to the refractive index of the reflecting medium: tan(ip) = μ.
- What are de Broglie Wavelength and Matter Waves? Every moving particle is associated with a wave whose wavelength is given by λ = h / p = h / (mv).
- Define Half-Life and Mean Life of a Radioactive Substance: Half-life (T1/2 = 0.693 / λ) is the time required for half the original number of radioactive nuclei to decay; Mean life (τ = 1 / λ) is the sum of lifetimes of all atoms divided by the total number.
12th Chemistry Volume 1 & 2 Top Golden Questions
Chemistry board exams test theoretical principles in physical chemistry, mineralogy in inorganic chemistry, and named reactions/mechanisms in organic chemistry.
Top 5-Mark Golden Questions & Named Reactions (Chemistry)
- Unit 1 (Metallurgy): Explain Mond’s Process for refining Nickel and Van Arkel method for refining Zirconium and Titanium.
- Unit 1 (Metallurgy): Ellingham Diagram principles, key observations, and limitations in predicting the thermodynamic feasibility of metallurgical reduction.
- Unit 5 (Coordination Chemistry): Postulates of Werner’s coordination theory and experimental verification using AgNO3 precipitation tests.
- Unit 5 (Coordination Chemistry): Crystal Field Theory (CFT) explanation of d-orbital splitting in octahedral and tetrahedral complexes.
- Unit 6 (Solid State): Derive the packing efficiency of Simple Cubic (SC: 52.4%), Body-Centered Cubic (BCC: 68%), and Face-Centered Cubic (FCC: 74%) unit cells.
- Unit 7 (Chemical Kinetics): Derive the integrated rate equation for a First-Order Reaction (k = (2.303 / t) log([A]0 / [A])) and its half-life expression.
- Unit 11 (Hydroxy Compounds): Dow’s Process for preparation of Phenol from Chlorobenzene and Kolbe’s Reaction / Reimer-Tiemann reaction.
- Unit 12 (Carbonyl Compounds): Aldol Condensation mechanism and Cannizzaro Reaction mechanism with structural intermediate steps.
- Unit 13 (Organic Nitrogen Compounds): Gabriel Phthalimide Synthesis for preparing aliphatic primary amines and Carbylamine test.
- Unit 14 (Biomolecules): Structure and mutarotation of Glucose and Fructose; differences between DNA and RNA.
Top 2-Mark & 3-Mark Recurring Concepts (Chemistry)
- What is Lanthanoid Contraction and state its consequences? The steady decrease in the size of Ln3+ ions with increase in atomic number due to poor shielding of 4f electrons. Consequences: similar chemical properties and difficulty in separation of lanthanoids.
- Define Coordination Number: The total number of ligand donor atoms directly bonded to the central metal atom or ion.
- Differentiate Schottky Defect and Frenkel Defect: Schottky defect involves missing equal numbers of cations and anions (decreases density); Frenkel defect involves a smaller ion occupying an interstitial site (density unchanged).
- Define Half-Life Period of a Reaction: The time required for the reactant concentration to decrease to one-half of its initial value: t1/2 = 0.693 / k for first-order reactions.
- State Ostwald’s Dilution Law: For a weak electrolyte, the degree of dissociation is inversely proportional to the square root of concentration: α = √(Ka / C).
- What is a Buffer Solution? Give an example: A solution which resists any drastic change in pH upon the addition of small amounts of acid or base (e.g., CH3COOH + CH3COONa).
- Lucas Test for Alcohols: Distinguishes 1°, 2°, and 3° alcohols using anhydrous ZnCl2 and conc. HCl (tertiary: immediate turbidity; secondary: turbidity after 5 minutes; primary: turbidity only on heating).
Important Numerical Problems & Key Formula Sheet
To prepare for compulsory problem questions (Q.No. 24 in Part II and Q.No. 33 in Part III), practice numerical examples using this state board formula sheet:
| Subject & Topic | Formula Expression | Key Parameters | Board Exam Question Target |
|---|---|---|---|
| Physics: Electrostatics | E = q / (4πε0r²) | ε0 = 8.854 × 10−12 C²/N•m² | Force & field between charges |
| Physics: Current Elec. | Reff = R1 + R2 (Series); 1/Reff = Σ(1/R) | Resistor networks in Ω | Potentiometer & meter bridge |
| Physics: AC Circuits | Z = √[R² + (XL − XC)²] | Impedance Z in Ω; ω = 2πf | Series RLC resonance & Q-factor |
| Physics: Optics | 1/f = (μ − 1)(1/R1 − 1/R2) | Radii of curvature in cm | Lens combination power & focal length |
| Chemistry: Solid State | ρ = (z × M) / (a³ × NA) | ρ in g/cm³, a in cm, z = atoms/cell | Density of crystal lattice calculation |
| Chemistry: Kinetics | t1/2 = 0.693 / k (1st order) | Rate constant k in s−1 | Calculations of reactant percentage decay |
| Chemistry: Ionic Eq. | pH = −log10[H+]; pH + pOH = 14 | [H+] in mol/L | pH of weak acids & buffer mixtures |
Formula Tip: Always specify numerical answers with correct units and significant figures. In board examinations, write given data, the applicable formula, the substitution step, and the final boxed answer with units for full credit.
Download 12th Physics & Chemistry Golden Questions PDF
Access free unit-wise PDFs, previous public exam question papers, and official PTA model papers prepared by postgraduate teachers (PGT) across Tamil Nadu:
| Resource Title | Portions & Units | Medium | Download Action Link |
|---|---|---|---|
| 12th Physics Volume 1 Golden Questions PDF | Units 1 to 5 (Electrostatics to EM Waves) | English Medium (EM) | Download Physics Vol 1 PDF |
| 12th Physics Volume 2 Golden Questions PDF | Units 6 to 11 (Optics to Communication) | English Medium (EM) | Download Physics Vol 2 PDF |
| 12th Chemistry Volume 1 Golden Questions PDF | Units 1 to 7 (Metallurgy to Kinetics) | English Medium (EM) | Download Chemistry Vol 1 PDF |
| 12th Chemistry Volume 2 Golden Questions PDF | Units 8 to 15 (Ionic Eq. to Everyday Life) | English Medium (EM) | Download Chemistry Vol 2 PDF |
| 12th Physics & Chemistry Golden Questions (TM) | தொகுதி 1 & 2 முழு பாடங்கள் வினா-விடை | Tamil Medium (TM) | Download TM Golden Questions PDF |
| 12th PTA Model Question Papers (6 Sets) | Official Parent-Teacher Association Sets | Bilingual (TM & EM) | Download 12th PTA Bank PDF |
| 12th Previous Years Public Exam Papers (2020–2024) | Original DGE State Board Examination Papers | Bilingual (TM & EM) | Download Plus Two Public Papers |
Frequently asked questions
What are the "Golden Questions" for 12th Physics and Chemistry?
Golden Questions are the high-yield, recurring 2-mark definitions, 3-mark conceptual questions, and 5-mark major derivations that have appeared repeatedly in Tamil Nadu government model papers, PTA sets, and quarterly/half-yearly and public exams over the past five years.
What are the compulsory question numbers in the Class 12 board exam?
In both Physics and Chemistry, Question No. 24 in Part II (2-mark question) and Question No. 33 in Part III (3-mark question) are compulsory. They are typically numerical problems testing core formulas.
What is the minimum passing score in 12th Physics and Chemistry theory?
Out of 70 theory marks, candidates must secure at least 15 marks. Along with 20 marks in school practical evaluations and 10 internal marks, the student must achieve an aggregate passing score of 35 out of 100.
How many 5-mark questions must be answered in 12th Physics and Chemistry?
Part IV consists of 5 questions carrying 5 marks each (25 marks total). Each question features an internal “Either / Or” choice (e.g., Q.34 (a) or (b)), allowing students to choose the derivation or named reaction they know best.
Where can students download 12th PTA question banks with answer keys?
Students and teachers can download the complete 6 sets of PTA model question papers with verified answer keys directly from KalviMani’s dedicated Plus Two study materials and question papers repository.
Related pages on KalviMani
12th Science Study Materials Hub · 12th Plus Two Study Materials Hub · Samacheer Kalvi 12th Textbooks PDF · TN 12th Public Exam Time Table 2027 · TN Half Yearly Exam Time Table · 12th PTA Question Bank (6 Sets) · 12th Plus Two Question Papers Archive