CBSE Class 10 Science SQP 2027 — Assertion Reason and Diagram Based Strategy
CBSE Class 10 Science SQP 2027 complete analysis — 39 questions, 80 marks, 3 hours. Deep guide on assertion-reason questions (4 in Science vs 2 in Maths), diagram-based question strategy, section-wise breakdown, chapter-wise SQP mapping, and solving strategies for every section type.
In short: The CBSE Class 10 Science SQP 2027 was released on Sep 21, 2026 along with its marking scheme. The paper has 39 questions across 5 sections (A-E) totalling 80 marks in 3 hours. A critical difference from Maths: Science has 4 assertion-reason questions (Q17-Q20) compared to Maths' 2 — meaning 4 marks depend on your ability to evaluate assertion-reason pairs. Diagram-based questions appear across all sections and are a major scoring opportunity if you know which diagrams repeat. CBSE confirmed no change in the question paper design for 2026-27 — the same 50% competency-based + 50% constructed response pattern continues.
SQP 2027 Structure at a Glance
Section
Question Type
No. of Questions
Marks per Q
Total Marks
Time to Spend
A
MCQs (Q1-Q16) + Assertion-Reason (Q17-Q20)
20
1
20
30 minutes
B
Very Short Answer (VSA)
6
2
12
18 minutes
C
Short Answer (SA)
7
3
21
35 minutes
D
Long Answer (LA)
3
5
15
30 minutes
E
Case-Based / Integrated
3
4
12
25 minutes
—
Total
39
—
80
~138 min + 42 min buffer
Note: Total paper time is 180 minutes. The allocation above uses ~138 minutes for writing, leaving ~42 minutes for reading, revision, and diagram completion.
Section A — MCQs and Assertion-Reason (20 Marks)
MCQ Breakdown (Q1-Q16)
Aspect
Details
Standard MCQs
16 questions, 1 mark each
Coverage
Physics, Chemistry, and Biology — roughly equal split
Competency-based
Most MCQs are application-based, not direct recall
Diagram-based MCQs
2-3 MCQs include a diagram or figure to interpret
Assertion-Reason Deep Dive (Q17-Q20)
Science has 4 assertion-reason questions — double what Maths has. This is significant because:
Comparison
Maths
Science
Number of AR questions
2
4
Total AR marks
2
4
Percentage of Section A
10%
20%
Typical topics
Geometry theorems, Number theory
Physics laws, Chemical properties, Biological processes
The 4-Option AR Format
Option
Meaning
(a)
Both Assertion and Reason are true, and Reason is the correct explanation of Assertion
(b)
Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion
(c)
Assertion is true but Reason is false
(d)
Assertion is false but Reason is true
AR Solving Strategy — 3-Step Independent Evaluation
Step
Action
What You're Checking
Step 1
Evaluate the ASSERTION alone — is this statement scientifically correct?
Ignore the Reason completely
Step 2
Evaluate the REASON alone — is this statement scientifically correct?
Ignore the Assertion completely
Step 3
IF both are true → Does the Reason DIRECTLY CAUSE or EXPLAIN the Assertion?
Check for causal link, not just topic similarity
Common AR Topics from SQP Pattern
Subject Area
Typical Assertion
Typical Reason
Common Answer
Physics — Electricity
"A thicker wire has lower resistance"
"Resistance is inversely proportional to area of cross-section"
(a) — Reason explains Assertion
Chemistry — Metals
"Sodium is stored under kerosene"
"Sodium is a very reactive metal"
(a) — Reason explains Assertion
Biology — Reproduction
"DNA copying is essential in reproduction"
"DNA copying creates variation"
(b) — Both true, but variation is a consequence, not the reason for copying being essential
Physics — Light
"Concave mirror is used in headlights"
"Concave mirror converges light"
(b) — Both true, but headlights use diverging beam from focus, not convergence
Section B — Very Short Answers (12 Marks)
Aspect
Details
Questions
6 questions, 2 marks each
Answer length
2-4 lines or a small diagram with label
Internal choice
Some questions offer OR option
Key skill
Precision — say exactly what's asked, nothing more
Diagram tip
A labelled diagram can replace a paragraph and score full marks
Section B Strategy
Strategy
Why It Works
If asked "Name the…" or "State the…" → give the fact directly
Don't write paragraphs for 2-mark questions
If a diagram can answer the question → draw it
"Draw a ray diagram for image formation in a concave lens" = 2 marks for a correct diagram
Show the formula before solving numerical VSAs
1 mark for formula + 1 mark for correct answer
Don't skip any — these are the easiest marks after MCQs
12 marks from 6 short questions is very achievable
Section C — Short Answers (21 Marks)
Aspect
Details
Questions
7 questions, 3 marks each
Answer length
Half a page (8-10 lines) or calculation with diagram
Key skill
Structured answers — point-wise or step-wise
Common formats
"Explain with diagram", "Compare X and Y", "Give 3 reasons"
Section C Scoring Tips
Tip
Marks Impact
Use bullet points or numbered points for "Give 3 differences"
1 mark per correct point — clean format helps examiners
Always draw a diagram when the question says "with diagram"
Diagram = 1 mark out of 3 in most cases
For chemical equations: balance + state symbols
Unbalanced equation = lose 0.5-1 mark
For Physics numericals: formula → substitution → calculation → answer with unit
Missing unit = lose 0.5 mark
Practice CBSE Science on Padhaao
AI tutor with 10 learning modes · Quiz, Flashcards, Exam Practice & more · 3 free chapters daily
Section A MCQ, Section C numerical, Section E case
Power
P = VI = I²R = V²/R
Section C numerical
Resistance in series
R = R₁ + R₂ + R₃
Section E case study
Resistance in parallel
1/R = 1/R₁ + 1/R₂ + 1/R₃
Section E case study
Mirror formula
1/v + 1/u = 1/f
Section C/D numerical
Lens formula
1/v − 1/u = 1/f
Section C/D numerical
Magnification
m = −v/u = h'/h
Section B/E
Power of lens
P = 1/f (in metres)
Section A MCQ
Chemistry Key Reactions from SQP
Reaction Type
Example
Where It Appears
Combination
2Mg + O₂ → 2MgO
Section A MCQ
Decomposition
2FeSO₄ → Fe₂O₃ + SO₂ + SO₃
Section C
Displacement
Fe + CuSO₄ → FeSO₄ + Cu
Section A MCQ
Double displacement
Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl
Section B
Neutralisation
NaOH + HCl → NaCl + H₂O
Section E case
Assessment Pattern: 50-50 Competency Split
Question Category
Percentage
Marks
Where in Paper
Competency-Based (application, analysis)
50%
40
MCQs, AR, case-based, some SA/LA
Constructed Response (knowledge, recall)
50%
40
VSA, SA, LA with direct answers
CBSE confirmed this split is unchanged for 2026-27. The 50% competency-based questions include all MCQs, assertion-reason, and case-study questions. The 30 most expected Science questions cover both types.
Time Management for the Full Paper
Phase
Time
Action
Reading time
15 min
Read full paper, mark easy/hard, plan order
Section A (MCQs + AR)
30 min
All 20 questions — no blanks, no negative marking
Section B (VSA)
18 min
Quick answers, show formula for numericals
Section E (Case-based)
25 min
Read carefully, extract data, solve sub-questions
Section C (SA)
35 min
Structured answers, diagrams where asked
Section D (LA)
30 min
Full answers with diagrams, pick best OR option
Revision
27 min
Recheck MCQs, complete diagram labels, verify units
Frequently Asked Questions
Q1. Why does Science have 4 assertion-reason questions but Maths only has 2?
CBSE designs each subject's SQP independently. Science has more scope for assertion-reason because Physics laws, chemical properties, and biological processes naturally lend themselves to cause-and-effect evaluation. The 4 AR questions in Science (Q17-Q20) mean 4 marks — that's 20% of Section A. Practice the 3-step independent evaluation method.
Q2. Which diagrams should I absolutely practice before the board exam?
Based on SQP + PYQ analysis: human heart (cross-section), ray diagrams for concave/convex mirror and lens, electric circuit (series + parallel), magnetic field lines around a solenoid, nephron, neuron, and flower L.S. for reproduction. These 8-10 diagrams appear repeatedly. For a complete list, check our 50 important Biology diagrams guide.
Q3. Are the case-based questions in Science harder than in Maths?
They're different, not necessarily harder. Science case studies often require you to identify a process or explain a phenomenon from the passage, while Maths case studies require calculations. The Science case studies test comprehension and concept application. Practice reading science passages and extracting key information.
Q4. Has the SQP pattern changed for 2027?
No. CBSE officially confirmed that the question paper design and assessment pattern for 2026-27 remain the same as 2025-26. The 39-question, 5-section format with 50% competency-based questions is unchanged. The SQP was released on Sep 21, 2026.
Q5. How should I split my revision between Physics, Chemistry, and Biology?
Based on the SQP marks distribution: Physics (Light + Electricity) carries the most marks (~18-20), followed by Biology (Life Processes + Heredity + Reproduction, ~18-20 marks), then Chemistry (~15-18 marks). But don't ignore any section — every chapter has at least 1 MCQ. For chapter-wise priorities, see our Science chapter-wise weightage guide.
Q6. Is it true that the actual board paper closely matches the SQP?
About 60-70% match on question types, chapter weightage, and difficulty. Specific questions differ. The structure (sections, marks per section, number of questions) matches almost exactly. For detailed historical comparison, see our SQP vs actual board paper analysis.
