Updated for 2025-26 Board Exam Pattern | 50% CBQ Weightage | Science + Maths Chapter-wise Strategies
| 50% of Paper | 40 Marks at Stake | 3 CBQ Types | Feb 25, 2026 |
|---|---|---|---|
| CBQs in every Class 10 board paper | Out of 80 marks are competency-based | Case Study · Assertion-Reason · App MCQ | Class 10 Science board exam date |
Half your CBSE Class 10 board paper is now competency-based — and most students aren’t ready for it. Starting from the 2024-25 academic session, CBSE raised the weightage of Competency-Based Questions (CBQs) to 50% of every 80-mark theory paper in both Science and Maths. That’s 40 out of 80 marks testing whether you can apply knowledge to real-world situations — not just recall what you memorised from NCERT.
The 2025 board exams confirmed what experts predicted: students who only memorised formulas and definitions struggled badly. Teachers reported that the Maths paper had “no straightforward questions,” and nearly 15–20% of students found Algebra, Trigonometry, and case-study questions significantly harder than expected.
The good news? CBQs are not harder concepts — they are the same NCERT concepts in unfamiliar packaging. Once you understand how each CBQ type works and practise a repeatable solving strategy, these 40 marks become your biggest scoring opportunity, not your biggest weakness.
This complete guide gives you everything: the official exam pattern, chapter-wise CBQ breakdowns, proven solving strategies for each question type, time management blueprints, and the most commonly made mistakes — based on real CBSE sample papers and 2025 board exam analysis.
What’s in This Guide
- What is a Competency-Based Question?
- The New 2026 Paper Pattern — Marks Breakdown
- The 3 Types of CBQs — And What Each Tests
- Chapter-wise CBQ Frequency Table — Science
- Chapter-wise CBQ Frequency Table — Maths
- How to Solve Case-Study Questions (7-Step Method)
- How to Crack Assertion-Reason Questions
- How to Eliminate Wrong Options in Application MCQs
- Time Management Blueprint
- The 5 Costliest CBQ Mistakes
- How Step-Marks Work in Your Favour
- Best Books and Free Resources
What is a Competency-Based Question?
According to CBSE’s official framework, Competency-Based Questions are designed to assess a student’s ability to apply knowledge and skills in practical or unfamiliar situations, rather than testing rote recall. The April 2024 CBSE circular (Acad-15/2024) describes the goal as creating “an educational ecosystem that moves away from rote memorisation towards learning focused on creative, critical, and systems thinking.”
Traditional Questions vs Competency-Based Questions
| Feature | Traditional Question | Competency-Based Question |
|---|---|---|
| What it tests | Memory and recall | Understanding and application |
| Format | Define / State / Write / Calculate | Case passage / Scenario / Data table |
| Example (Electricity) | “State Ohm’s Law” | “A 60W and 100W bulb are in series. Which heats more? Explain.” |
| Example (Maths) | “Find the nth term of 2, 5, 8, 11…” | “A staircase has 12 steps, each 20 cm wide and 10 cm high. What distance does a person walk to reach the top?” |
| Bloom’s Level | Remember / Understand | Apply / Analyse / Evaluate |
| % in 2026 paper | 50% | 50% |
The New 2026 Paper Pattern — Exact Marks Breakdown
Class 10 Science (Code 086) — 39 Questions, 80 Marks
| Section | Subject | Marks | CBQ Types Included |
|---|---|---|---|
| Section A | Biology | 30 marks | MCQs, A-R, Case Study (Q15) |
| Section B | Chemistry | 25 marks | MCQs, A-R, Case Study (Q28) |
| Section C | Physics | 25 marks | MCQs, A-R, Case Study (Q38) |
| Total Theory | — | 80 marks | ~40 marks are CBQs (50%) |
Class 10 Maths Standard (Code 041) — 38 Questions, 80 Marks
| Section | Format | Questions | Marks | CBQ % |
|---|---|---|---|---|
| Section A | MCQs + 2 Assertion-Reason | 20 (Q1–Q20) | 20 | High |
| Section B | Very Short Answer (2 marks) | 5 (Q21–Q25) | 10 | Medium |
| Section C | Short Answer (3 marks) | 6 (Q26–Q31) | 18 | Medium |
| Section D | Long Answer (5 marks) | 4 (Q32–Q35) | 20 | Medium |
| Section E | Case Study (4 marks each) | 3 (Q36–Q38) | 12 | 100% CBQ |
| TOTAL | 38 | 80 | ~50% CBQ |
Unit-wise Marks Weightage in Maths
| Unit | Mark Weight | Most CBQ-heavy Chapters |
|---|---|---|
| Algebra | 20 marks | Arithmetic Progressions, Quadratic Equations |
| Geometry | 15 marks | Triangles, Circles |
| Trigonometry | 12 marks | Introduction to Trig, Heights & Distances |
| Statistics & Probability | 11 marks | Statistics, Probability |
| Mensuration | 10 marks | Surface Areas & Volumes, Areas Related to Circles |
| Number Systems | 6 marks | Real Numbers |
| Coordinate Geometry | 6 marks | Coordinate Geometry |
The 3 Types of CBQs — And What Each Tests
Case-Study / Source-Based Questions
What it looks like: A paragraph, data table, or experimental description (50–120 words) followed by 3–4 sub-questions. In Science these are Q15, Q28, and Q38. In Maths these are Section E questions Q36–Q38.
Marks: 4 marks each. Science: 3 case studies = 12 marks. Maths Section E: 3 case studies = 12 marks.
What it tests: Your ability to extract information from a context and apply the relevant NCERT concept. The answer is almost never directly stated in the passage.
Assertion-Reason (A-R) Questions
What it looks like: Two statements — an Assertion (A) and a Reason (R) — with four fixed options testing whether both are true and whether R correctly explains A.
Marks: 1 mark each. Science: 4 A-R questions = 4 marks. Maths: 2 A-R questions = 2 marks.
The 4 fixed options:
- (A) Both true, and R is the correct explanation of A
- (B) Both true, but R does NOT explain A
- (C) A is true, R is false
- (D) A is false, R is true (or both false)
Application-Based MCQs
What it looks like: Standard 4-option MCQs framed around a real-world scenario. Requires applying the correct concept rather than recalling a fact.
Marks: 1 mark each. These account for the bulk of CBQ marks across Sections A–D in both subjects.
Chapter-wise CBQ Frequency — Science
Focus your preparation based on this frequency map, built from the official CBSE SQP 2025-26 and past board papers:
| Chapter | Marks Weight | Case Study | A-R | App MCQ | Priority |
|---|---|---|---|---|---|
| Life Processes (Ch 6) | 8–10 marks | ★★★ | ★★ | ★★★ | 🔴 HIGH |
| Electricity (Ch 12) | 7–10 marks | ★★★ | ★★ | ★★★ | 🔴 HIGH |
| Light — Reflection & Refraction (Ch 10) | 7–9 marks | ★★★ | ★★★ | ★★★ | 🔴 HIGH |
| Acids, Bases and Salts (Ch 2) | 7–8 marks | ★★★ | ★★★ | ★★ | 🔴 HIGH |
| Metals and Non-Metals (Ch 3) | 7–8 marks | ★★ | ★★ | ★★★ | 🟠 MEDIUM-HIGH |
| Carbon and Its Compounds (Ch 4) | 6–7 marks | ★★ | ★★★ | ★★ | 🟠 MEDIUM-HIGH |
| Chemical Reactions (Ch 1) | 6–7 marks | ★ | ★★★ | ★★★ | 🟠 MEDIUM-HIGH |
| Heredity (Ch 9) | 5–6 marks | ★ | ★★★ | ★★★ | 🟡 MEDIUM |
| Control & Coordination (Ch 7) | 5–6 marks | ★★ | ★★ | ★★★ | 🟡 MEDIUM |
| Reproduction (Ch 8) | 5 marks | ★★ | ★ | ★★ | 🟡 MEDIUM |
| Human Eye (Ch 11) | 3–5 marks | ★ | ★★★ | ★★ | 🟡 MEDIUM |
| Magnetic Effects (Ch 13) | 3–5 marks | ★ | ★★ | ★★ | 🟢 LOWER |
Chapter-wise CBQ Frequency — Maths
| Chapter | Unit Weight | Section E Frequency | MCQ CBQ Frequency | Priority |
|---|---|---|---|---|
| Arithmetic Progressions (Ch 5) | Algebra (20M) | ★★★ Very High | ★★★ High | 🔴 HIGH |
| Coordinate Geometry (Ch 7) | CoordGeo (6M) | ★★★ Very High | ★★ Medium | 🔴 HIGH |
| Trigonometry — Heights & Dist. (Ch 9) | Trig (12M) | ★★★ Very High | ★★★ High | 🔴 HIGH |
| Statistics (Ch 13) | Stat/Prob (11M) | ★★★ High | ★★ Medium | 🔴 HIGH |
| Surface Areas & Volumes (Ch 12) | Mensuration (10M) | ★★ Medium-High | ★★ Medium | 🟠 MEDIUM-HIGH |
| Areas Related to Circles (Ch 11) | Mensuration (10M) | ★★ Medium-High | ★★ Medium | 🟠 MEDIUM-HIGH |
| Quadratic Equations (Ch 4) | Algebra (20M) | ★ Occasional | ★★★ High | 🟠 MEDIUM-HIGH |
| Probability (Ch 14) | Stat/Prob (11M) | ★★ Medium | ★★★ High | 🟡 MEDIUM |
| Pair of Linear Equations (Ch 3) | Algebra (20M) | ★ Occasional | ★★ Medium | 🟡 MEDIUM |
| Triangles (Ch 6) | Geometry (15M) | ★ Occasional | ★★★ High | 🟡 MEDIUM |
| Real Numbers (Ch 1) | Number (6M) | ★ Rare | ★★ Medium | 🟢 LOWER |
| Circles (Ch 10) | Geometry (15M) | ★ Rare | ★★ Medium | 🟢 LOWER |
How to Solve Case-Study Questions — The 7-Step Method
The most important thing to understand: the passage gives you context, not the answer. The answer always comes from applying the relevant NCERT concept to that context. Students who treat these like reading comprehension waste time and lose marks.
- Read the full passage once (2 minutes max). Underline all numbers, units, and key terms. Identify the chapter.
- Identify the core concept. Match the scenario to your NCERT topic: staircase steps = AP; DSLR camera = Light/Optics.
- Treat each sub-question independently. Sub-parts (a), (b), (c) are separate — don’t assume they build on each other.
- Draw a diagram where applicable. For optics, circuits, coordinate planes, and heights/distances — draw and label before writing. Diagrams carry independent marks in the marking scheme.
- Write: Given → To Find → Formula → Solution. Use all four headers even for 1-mark sub-questions. This triggers step-mark credit from the examiner.
- Show every calculation step. CBSE awards ½ mark for the formula, ½ mark for substitution, and 1 mark for the correct answer with units. A wrong final answer can still earn partial marks.
- Apply a common-sense check. A building that comes out 0.3 m tall or a resistance of 500,000 Ω in a household circuit signals a calculation error. CBQs always use realistic values.
Worked Example — Maths AP Case Study (SQP Q36)
Passage: “Two boys Aryan and Roshan each write an AP. Aryan’s: −5, −2, 1, 4, … Roshan’s: 187, 184, 181, … Find the sum of their common differences. Find the 34th term of Aryan’s AP. Find the sum of the first 10 terms of Roshan’s AP.”
Q(a) — Sum of common differences: d₁ = 3, d₂ = −3. Sum = 3 + (−3) = 0.
Q(b) — 34th term of Aryan’s AP: T₃₄ = a + (n−1)d = −5 + (33)(3) = −5 + 99 = 94.
Q(c) — Sum of first 10 terms of Roshan’s AP: S₁₀ = n/2 × [2a + (n−1)d] = 10/2 × [2(187) + 9(−3)] = 5 × 347 = 1735.
How to Crack Assertion-Reason Questions
Golden rule: evaluate each statement independently before connecting them. Never read both statements together — this creates false logical links that lead to wrong answers.
- Evaluate the Assertion alone. Is it factually correct based on NCERT? Ignore the Reason completely at this stage.
- If Assertion is FALSE → answer is (D). Stop here.
- If Assertion is TRUE, evaluate the Reason alone. Is it a correct standalone statement?
- If Reason is FALSE → answer is (C).
- If both TRUE: does R directly cause or explain A? If yes → (A). If not → (B).
Watch for absolute language. Words like ‘always’, ‘never’, ‘only’, and ‘all’ in a statement almost always signal it is false. Time target: 1–1.5 minutes per A-R question.
How to Eliminate Wrong Options in Application MCQs
- Dimensional / unit analysis. Eliminate options with wrong units or physically impossible magnitudes.
- Back-substitution (Maths). Plug each option back into the equation. Works well for Quadratic Equations, APs, and coordinate geometry CBQs.
- Extreme-value testing. Substitute boundary values (x = 0, n = 1, θ = 90°) to eliminate options that fail at simple cases.
- Spot the close-but-wrong option. CBSE deliberately includes a near-miss with a sign error, wrong unit, or swapped formula. Find the difference before committing.
- Absolute-language check. Options containing ‘always’, ‘never’, or ‘only’ are almost always incorrect.
- Common-sense check. CBQs are grounded in realistic scenarios. Eliminate any option that is physically absurd.
There is no negative marking in CBSE board exams. Always attempt every MCQ — eliminate two options and choose between the remaining two if unsure.
Time Management Blueprint for the 3-Hour Paper
The biggest challenge in 2025 was not difficulty — it was time. CBQs require reading, analysis, and solving, each step taking 2–3× longer than a direct recall question.
| Section / Type | Questions | Time Budget | Per Question |
|---|---|---|---|
| Section A: MCQs + A-R | 20 × 1 mark | 30–35 minutes | ~1.5 min |
| Section B: Very Short Answer | 5 × 2 marks | 15 minutes | ~3 min |
| Section C: Short Answer | 6 × 3 marks | 25–30 minutes | ~4–5 min |
| Section D: Long Answer | 4 × 5 marks | 30–35 minutes | ~7–8 min |
| Section E: Case Study | 3 × 4 marks | 20–25 minutes | ~7–8 min |
| Buffer / Review | — | 10–15 minutes | Re-attempt skipped Qs |
Three rules: Never spend more than 8 minutes on a single case study — write what you know and return in the buffer. Attempt MCQs and A-R questions first to bank easy marks. Use the official 15-minute reading time to preview Section E and identify which chapters the three case studies come from.
The 5 Costliest CBQ Mistakes
1. Not Writing the Formula
CBSE awards ½ mark for the correct formula even when the final answer is wrong. Students who skip straight to calculation lose these marks. Always write the formula on its own line before substituting.
2. Skipping Diagrams in Science
In optics, electricity, and biology questions, diagrams carry their own independent marks. An explanation in words without a diagram will not receive those marks. Draw first, label clearly, then explain.
3. Over-Reading the Case Study Passage
Spending more than 2 minutes reading the passage wastes time. Read once, underline numbers and key terms, and move to the questions. Answers come from NCERT knowledge, not from the passage.
4. Connecting A-R Statements Without Checking Each Independently
Reading both A-R statements together causes students to assume a connection that may not exist. Always evaluate each statement alone first. Apply the 5-step decision framework from Section 7.
5. Memorising Without Understanding
A student who memorises V = IR but doesn’t understand what the relationship means will fail every CBQ that uses Ohm’s Law in a new context. For every formula: ask what each variable means physically, when it applies, and give one real-world example.
How Step-Marks Work in Your Favour
CBSE awards marks for correct intermediate steps even when the final answer is wrong. Understanding this can rescue 30–50% of marks on questions you only partially solve.
| Question Type | Marks | Step-Mark Breakdown |
|---|---|---|
| MCQ / A-R | 1 mark | All-or-nothing — correct answer only |
| Very Short Answer (2 marks) | 2 marks | Formula ½ + Substitution ½ + Answer with unit 1 |
| Short Answer (3 marks) | 3 marks | Concept/formula 1 + Working 1 + Answer 1 |
| Long Answer (5 marks) | 5 marks | Marks split across 2–3 sub-steps; partial credit throughout |
| Case Study sub-Q (2 marks) | 2 marks | Method 1 + Answer 1 |
A student who writes the parallel resistance formula and substitutes correctly but makes an arithmetic error still earns 2 out of 3 marks — but only if the formula and working are written clearly. The CBSE Marking Scheme PDFs also include ‘Commonly Made Errors’ and ‘Answering Tips’ sections; these are available free on cbseacademic.nic.in and reveal exactly what examiners look for.
Best Books and Free Resources for CBQ Practice
Foundation first: no supplementary book replaces deep NCERT understanding. Master NCERT first, then use CBQ practice books for application.
Free Official Resources
| Resource | Where to Find | Best Used For |
|---|---|---|
| CBSE SQP 2025-26 (Science + Maths) | cbseacademic.nic.in → Sample Question Papers → Class X | Understand exact CBQ format; practise all case studies |
| CBSE Marking Scheme (Science + Maths) | Same SQP page — MS PDF download | Learn step-marking pattern and examiner tips |
| CBSE Competency Focused Practice Qs (CFPQ) | cbseacademic.nic.in → CFPQ → Class 10 | Chapter-wise CBQ practice from the exam board itself — free and underused |
| NCERT Exemplar Problems | ncert.nic.in → Exemplar → Class 10 | Higher-order NCERT questions closest to CBQ style |
Recommended Books
| Book | Publisher | Best For |
|---|---|---|
| CBSE Question Bank Class 10 (Science + Maths) | Oswaal | Revision with ‘Why This Answer?’ explanations and mind maps |
| CBSE Educart Question Bank (Science + Maths) | Educart | Questions closely matching actual board paper CBQ formats |
| ScoreMore Case Study Questions | MTG | Specifically designed for case-study and A-R formats |
| 15 Sample Question Papers (Science + Maths) | Oswaal | Full exam simulation under timed conditions |
Your 30-Day CBQ Action Plan
| Week | Focus | Daily Action (30 min) |
|---|---|---|
| Week 1 | Understand format + High-priority chapters | Read this guide + 2 case studies daily from Life Processes and Electricity |
| Week 2 | Strategy practice + Maths Section E | 5 A-R questions daily + AP, Coordinate Geometry, Trig case studies |
| Week 3 | Full SQP simulation + Weak chapters | Solve official Science SQP under timed conditions + review marking scheme |
| Week 4 | Maths SQP + Final revision | Solve Maths Standard SQP + MCQ elimination practice + formula revision |
Final Thoughts
The shift to 50% competency-based questions is permanent under NEP 2020, and the 2026 boards will follow the same pattern as 2025. Three things should guide your preparation.
First: CBQ difficulty is a perception problem. The concepts are identical to what you have studied. Students who practise applying knowledge to new scenarios for even 30 minutes a day see marked improvement within two weeks.
Second: Chapter prioritisation matters. Life Processes, Electricity, and Light for Science; Arithmetic Progressions, Coordinate Geometry, and Trigonometry Applications for Maths. Master these six chapters for CBQs before moving to others.
Third: The marking scheme is your secret weapon. Writing formulas, drawing diagrams, and showing working rescue marks, even when your final answer is wrong. CBSE rewards the process, not just the answer.
Related Articles
- What Are Competency-Based Questions in CBSE? Definition & Examples →
- How to Solve Case-Study Questions: 7-Step Method with Examples →
