In short: The CBSE Class 12 Physics SQP 2027 was released on Sep 21, 2026, confirming the same paper design as 2025-26. The paper has 33 questions across 5 sections totalling 70 marks in 3 hours. Physics is where derivations and numericals decide your score — the SQP reveals which derivations and numerical types CBSE considers priority. This guide gives you a ranked list of 10 must-practice derivations and 10 must-practice numerical types directly from the SQP pattern, plus section-wise strategy and chapter-wise marks distribution. CBSE confirmed no change in the assessment pattern: 50% competency-based + 50% constructed responses.
SQP 2027 Structure at a Glance
| Section | Question Type | No. of Questions | Marks per Q | Total Marks | Time to Spend |
|---|---|---|---|---|---|
| A | MCQs | 16 | 1 | 16 | 24 minutes |
| B | Short Answer (SA-I) | 5 | 2 | 10 | 20 minutes |
| C | Short Answer (SA-II) | 7 | 3 | 21 | 35 minutes |
| D | Case-Based | 2 | 4 | 8 | 16 minutes |
| E | Long Answer (LA) | 3 | 5 | 15 | 30 minutes |
| — | Total | 33 | — | 70 | ~125 min + 55 min buffer |
Note: Total paper time is 180 minutes. Physics is 70 marks (not 80 like Maths), so you have extra buffer time. Use it for checking numericals and completing derivations.
Section-Wise Analysis and Strategy
Section A — MCQs (16 Marks)
| Aspect | Details |
|---|---|
| Questions | 16 standard MCQs, 1 mark each |
| Coverage | All units — Electrostatics to Semiconductors |
| Types | Conceptual, formula-based, diagram-based, assertion-reason style |
| Strategy | Eliminate wrong options. Watch for unit traps (μC vs C, mA vs A). Don't spend more than 1.5 min/question. |
Section B — SA-I: 2-Mark Questions (10 Marks)
| Aspect | Details |
|---|---|
| Questions | 5 questions, 2 marks each |
| What it tests | Direct application — one concept, one calculation or explanation |
| Typical format | "State and explain…", "Calculate…", "Draw and label…" |
| Strategy | Formula (½) + substitution (½) + answer with unit (1). Or: statement (1) + explanation (1). |
Section C — SA-II: 3-Mark Questions (21 Marks)
| Aspect | Details |
|---|---|
| Questions | 7 questions, 3 marks each |
| What it tests | Multi-step calculations, short derivations, compare-and-contrast |
| Internal choice | Some questions have OR options |
| Strategy | Show every step. Write formula → substitute → simplify → answer with unit. Diagram = extra clarity. |
Section D — Case-Based (8 Marks)
| Aspect | Details |
|---|---|
| Questions | 2 case-based questions, 4 marks each (split as sub-questions) |
| Format | A paragraph describing a physics scenario + 4-5 sub-questions |
| Topics typically | Optics (lenses/mirrors), Electromagnetic induction, Semiconductor devices |
| Strategy | Read the case fully. Identify the physics concept. Each sub-question is usually independent — attempt all. |
Section E — Long Answers (15 Marks)
| Aspect | Details |
|---|---|
| Questions | 3 questions, 5 marks each |
| What it tests | Full derivations, multi-part numericals, comprehensive explanations |
| Internal choice | Each question has an OR option |
| Strategy | Pick the option you know better. Draw clear diagrams. Show complete derivation. For numericals: formula → values → calculation → answer with correct unit and significant figures. |
10 Must-Practice Derivations from SQP Pattern
These derivations appear in the SQP and have repeated in PYQs (2024-2026). They are the highest-priority derivations for 2027.
| Rank | Derivation | SQP Section | PYQ Frequency | Marks |
|---|---|---|---|---|
| 1 | Gauss's Law — Electric flux through a closed surface + application (infinite plane sheet of charge) | Section E (5 marks) | 3/3 years | 5 |
| 2 | Lens Maker's Formula — Derivation using refraction at two spherical surfaces | Section E (5 marks) | 3/3 years | 5 |
| 3 | Young's Double Slit Experiment (YDSE) — Fringe width derivation | Section E (5 marks) | 3/3 years | 5 |
| 4 | Bohr's Model of Hydrogen Atom — Energy levels and radius of nth orbit | Section C/E (3-5 marks) | 2/3 years | 3-5 |
| 5 | AC Generator — Working principle and EMF derivation | Section E (5 marks) | 2/3 years | 5 |
| 6 | Refraction through a Prism — Derivation of δ = (μ-1)A for thin prism | Section C (3 marks) | 2/3 years | 3 |
| 7 | Biot-Savart Law — Magnetic field at centre of a circular loop | Section C/E (3-5 marks) | 2/3 years | 3-5 |
| 8 | Ampere's Circuital Law — Magnetic field inside a solenoid | Section C (3 marks) | 2/3 years | 3 |
| 9 | Potentiometer — Principle and comparison of EMFs of two cells | Section C (3 marks) | 2/3 years | 3 |
| 10 | Photoelectric Effect — Einstein's equation derivation + threshold frequency | Section B/C (2-3 marks) | 3/3 years | 2-3 |
For the complete derivation list with step-by-step solutions, see our Class 12 Physics derivations list.
10 Must-Practice Numerical Types from SQP Pattern
| Rank | Numerical Type | SQP Section | PYQ Frequency | Formula Required |
|---|---|---|---|---|
| 1 | Coulomb's Law — Force between two charges, equilibrium position of third charge | Section B/C | 3/3 years | F = kq₁q₂/r² |
| 2 | Kirchhoff's Rules — Find current in branches of a circuit (Wheatstone bridge) | Section C | 3/3 years | ΣV = 0, ΣI = 0 |
| 3 | Lens/Mirror Numericals — Image position, magnification, power | Section B/C | 3/3 years | 1/v − 1/u = 1/f, m = v/u |
| 4 | Photoelectric Effect — Threshold frequency, max KE of photoelectrons, stopping potential | Section B/C | 3/3 years | Kmax = hν − φ |
| 5 | de Broglie Wavelength — Wavelength of electron/proton at given potential | Section B | 2/3 years | λ = h/√(2meV) |
| 6 | Capacitor Combinations — Equivalent capacitance, energy stored, charge on plates | Section C | 2/3 years | C series, C parallel, E = ½CV² |
| 7 | Electromagnetic Induction — Induced EMF, flux change, Lenz's law application | Section C | 2/3 years | ε = −dΦ/dt |
| 8 | Nuclear Reactions — Mass defect, binding energy per nucleon | Section B/C | 2/3 years | ΔE = Δm × c² |
| 9 | AC Circuits — Impedance, resonant frequency, power factor (RLC circuit) | Section C | 2/3 years | Z = √(R² + (XL − XC)²) |
| 10 | Semiconductor Diode — Forward/reverse bias characteristics, Zener diode as voltage regulator | Section D (case) | 2/3 years | Qualitative + I-V graph |
For 20 repeated numerical types with shortcut methods, see our Physics numericals shortcuts guide.
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Chapter-Wise Marks Distribution from SQP
| Unit / Chapter | Section A | Section B | Section C | Section D | Section E | Total Marks |
|---|---|---|---|---|---|---|
| Electrostatics (Ch 1-2) | 3 | 2 | 3 | — | 5 | 13 |
| Current Electricity (Ch 3) | 2 | 2 | 3 | — | — | 7 |
| Magnetic Effects (Ch 4-5) | 2 | — | 3 | — | 5 | 10 |
| EMI and AC (Ch 6-7) | 2 | 2 | 3 | — | — | 7 |
| EM Waves (Ch 8) | 1 | — | — | — | — | 1 |
| Ray Optics (Ch 9) | 2 | 2 | — | 4 | 5 | 13 |
| Wave Optics (Ch 10) | 1 | — | 3 | — | — | 4 |
| Dual Nature (Ch 11) | 1 | 2 | — | 4 | — | 7 |
| Atoms and Nuclei (Ch 12-13) | 1 | — | 3 | — | — | 4 |
| Semiconductors (Ch 14) | 1 | — | 3 | — | — | 4 |
Key Observations
| Observation | Marks Impact |
|---|---|
| Electrostatics + Ray Optics together = ~26 marks (37% of paper) | These are your highest-priority chapters |
| Current Electricity + Magnetic Effects = ~17 marks | Second-priority block |
| EM Waves = only 1 mark (MCQ) | Don't over-invest time here |
| Dual Nature + Atoms/Nuclei = ~11 marks | Moderate priority — easy marks if you know the formulas |
See the complete analysis at Class 12 Physics chapter-wise weightage.
Derivation vs Numerical Split in SQP
| Question Type | Approximate Marks | Percentage of Paper |
|---|---|---|
| Derivation-based questions | 20-25 marks | ~30-35% |
| Numerical-based questions | 20-25 marks | ~30-35% |
| Conceptual/theory questions | 15-20 marks | ~20-25% |
| Diagram-based questions | 5-10 marks | ~10-15% |
This means roughly 40-50 marks of your 70-mark paper require either derivation writing or numerical solving. You CANNOT score well in Physics without practicing both.
Common Mistakes in Physics Board Exam (from SQP Marking Scheme)
| Mistake | Where It Happens | Marks Lost |
|---|---|---|
| Missing vector arrows on diagrams (electric field, magnetic field) | Section C/E derivations | 0.5-1 |
| Writing final answer without unit | Numericals in all sections | 0.5 per question |
| Not writing the correct number of significant figures | Numericals | 0.5 |
| Incomplete derivation — skipping intermediate steps | Section E (5-mark) | 1-2 |
| Wrong sign convention (mirrors/lenses) | Ray Optics numericals | Full marks lost |
| Not drawing ray diagram when question says "with the help of ray diagram" | Section C/E | 1-2 |
| Confusing Biot-Savart Law with Ampere's Law | Section C | Full marks if wrong law used |
| Writing E = mc² for nuclear reactions without explaining mass defect | Section C | 1 |
5-Mark Question Strategy (Section E)
Each 5-mark question typically follows this marking scheme:
| Component | Marks |
|---|---|
| Diagram (clear, labelled) | 1 |
| Setting up the derivation (assumptions, initial equations) | 1 |
| Step-by-step derivation / calculation | 2 |
| Final expression / answer with units | 1 |
| Total | 5 |
Tips for 5-Mark Questions
| Tip | Why |
|---|---|
| Always start with a diagram even if not explicitly asked | Most marking schemes award 1 mark for a relevant diagram |
| State assumptions clearly ("Consider a thin lens with…") | Sets up the derivation properly |
| Number your steps | Examiners can quickly verify each step = each mark |
| Box or underline the final answer | Makes it easy for the examiner to find your result |
| If you forget a step mid-derivation, write what you remember and continue | Partial marks are awarded for correct steps |
Time Management for 70-Mark Physics Paper
| Phase | Time | Action |
|---|---|---|
| Reading time | 15 min | Read full paper, identify easy derivations/numericals |
| Section A (MCQs) | 24 min | Solve all 16 MCQs |
| Section B (2-mark) | 20 min | Quick formula-based answers |
| Section D (Case-based) | 16 min | Read cases carefully, solve sub-questions |
| Section C (3-mark) | 35 min | Multi-step numericals and short derivations |
| Section E (5-mark) | 30 min | Full derivations with diagrams |
| Revision | 40 min | Check numerical calculations, verify units, complete diagrams |
Physics gives you 180 minutes for 70 marks, which is generous. Use the extra time to double-check calculations and polish derivations. For a general board exam time strategy, see our 3-hour time management guide.
Assessment Pattern: 50-50 Competency Split
| Question Category | Percentage | Marks | Where in Paper |
|---|---|---|---|
| Competency-Based | 50% | 35 | MCQs, case-based, application numericals |
| Constructed Response | 50% | 35 | Derivations, theory questions, standard numericals |
CBSE confirmed this pattern is unchanged for 2026-27. Competency-based questions test whether you can APPLY physics concepts to unfamiliar situations — not just reproduce derivations from memory.
Frequently Asked Questions
Q1. How many derivations should I prepare for the Class 12 Physics board exam? Based on SQP + PYQ analysis, you need at least 10-12 derivations thoroughly prepared. The 10 listed in this guide are the highest priority. But also keep 5-6 backup derivations ready since the OR options in Section E give you choices. The complete derivation list is at Physics derivations — board must-know.
Q2. Are Section D case-based questions harder than regular numericals? Not harder mathematically — they test the same formulas. The challenge is extracting the right data from a paragraph and identifying which concept applies. Each sub-question within a case is usually 1 mark, so they're simpler than Section C or E questions individually. Practice reading physics scenarios and identifying the relevant formula.
Q3. What's the most common derivation in the SQP? Gauss's Law application (infinite plane sheet or uniformly charged sphere) and Lens Maker's Formula appear most consistently across SQPs and PYQs. YDSE fringe width derivation is the third most common. At least one of these three will almost certainly appear as a 5-mark question. Practice all three until you can write them from memory.
Q4. Should I focus more on numericals or derivations for the board exam? Both carry roughly equal weight (~20-25 marks each). You can't skip either. If you're short on time, prioritise the 10 numerical types and 10 derivations listed in this guide — they cover the highest-probability questions. Also, some questions combine both (derive a formula, then use it to solve a numerical).
Q5. Has the SQP pattern changed for 2027? No. CBSE confirmed that the 2026-27 question paper design and assessment pattern remain unchanged from 2025-26. The 33-question, 5-section, 70-mark format continues. The SQP was released on Sep 21, 2026 with the marking scheme.
Q6. How closely does the actual Physics paper match the SQP? Historical data shows about 60-65% match on question types and chapter weightage. The structure (sections, marks distribution) matches ~95%. Specific questions and numerical values differ. For detailed year-by-year comparison, see our SQP vs actual board paper analysis.
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