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CBSE Class 12 Science Question Paper Generator

Board-pattern papers for Physics (042), Chemistry (043), and Biology (044) — in under 2 minutes. 50% competency questions, step-wise marking scheme, and HD diagrams included.

Set the chapter weightage, choose difficulty distribution, and generate Set A, B, and C simultaneously. Every paper comes with a complete answer key and marking scheme ready to print.

50% competency questions per CBSE 2025-26 mandate Step-wise marking scheme per CBSE protocol Set A, B, C generated simultaneously Export as print-ready PDF or editable DOCX

2025-26 Blueprint — Chapter by Chapter

Every generated paper follows the exact unit weightage and question type distribution from the latest CBSE circular. Select a subject to see the full breakdown.

Physics (042) — Unit Weightage

70 Marks Theory + 30 Marks Practical

Unit 1: Electrostatics & Current Electricity

Ch 1: Electric Charges, Ch 2: Electrostatic Potential, Ch 3: Current Electricity

16
2 MCQ 1 Case-Based (4 sub-Qs) 1 Short Answer 1 Long Answer

Unit 2: Magnetic Effects & EMI

Ch 4: Moving Charges, Ch 5: Magnetism, Ch 6: EMI, Ch 7: AC Circuits

17
3 MCQ 2 Short Answer 1 Long Answer (5 marks)

Unit 3: Optics (Ray & Wave)

Ch 9: Ray Optics, Ch 10: Wave Optics

18
2 MCQ 1 Source-Based 2 Short Answer 1 Long Answer

Unit 4: Dual Nature, Atoms & Nuclei

Ch 11: Dual Nature, Ch 12: Atoms, Ch 13: Nuclei

12
3 MCQ 1 Short Answer

Unit 5: Electronic Devices

Ch 14: Semiconductor Electronics

07
2 MCQ 1 Short Answer

Question Type Distribution (70 Marks)

Section A — MCQ & Assertion-Reasoning (1 mark each) 16 × 1 = 16
Section B — Very Short Answer (2 marks each) 5 × 2 = 10
Section C — Short Answer (3 marks each) 7 × 3 = 21
Section D — Case-Based (4 marks each) 2 × 4 = 08
Section E — Long Answer (5 marks each) 3 × 5 = 15
Total 70 Marks

50% Competency Breakdown — Physics

Of the 70 marks, 35 marks are competency-based as per the 2025-26 CBSE mandate:

  • All 16 MCQs and Assertion-Reasoning are application-level (not recall)
  • 2 Case-Based questions (8 marks) from Unit 1 and Unit 3
  • 1 Source-Based question (4 marks) from Unit 3
  • Long answer questions include internal choice

Chemistry (043) — Unit Weightage

70 Marks Theory + 30 Marks Practical

Physical Chemistry

Solutions, Electrochemistry, Chemical Kinetics, Surface Chemistry

23
3 MCQ 2 Numericals (3 marks) 1 Case-Based

Inorganic Chemistry

p-Block, d & f Block, Coordination Compounds

19
3 MCQ 2 Short Answer 1 Long Answer

Organic Chemistry

Haloalkanes, Aldehydes, Ketones, Carboxylic Acids, Amines, Biomolecules, Polymers

28
4 MCQ 3 Short Answer 1 Source-Based 1 Long Answer

What SchoolDeck generates for Chemistry

  • IUPAC nomenclature MCQs with distractor options that test common errors
  • Organic reaction mechanism questions with proper arrow notation in PDF output
  • Electrochemistry numericals with verified answers (EMF, conductance, Faraday's law)
  • Chemical kinetics numericals (rate law, half-life, first-order reactions)
  • Coordination compound questions with IUPAC names, geometry, and isomerism
  • Step-wise marking scheme for all numericals and mechanism questions

Note on deleted chapters: If CBSE removes chapters (such as Chemistry in Everyday Life or Polymers from the 2025-26 syllabus), the generator excludes them automatically. The system is updated within 48 hours of any official CBSE circular.

Biology (044) — Unit Weightage

70 Marks Theory + 30 Marks Practical

Unit VI: Reproduction

Ch 1: Reproduction in Organisms, Ch 2: Sexual Reproduction in Plants, Ch 3: Human Reproduction, Ch 4: Reproductive Health

16
2 MCQ 1 Diagram question 1 Case-Based

Unit VII: Genetics & Evolution

Ch 5: Principles of Inheritance, Ch 6: Molecular Basis of Inheritance, Ch 7: Evolution

20
3 MCQ Pedigree analysis 1 Long Answer

Unit VIII: Biology in Human Welfare

Ch 8: Human Health & Disease, Ch 9: Microbes in Human Welfare

12
2 MCQ 2 Short Answer

Unit IX: Biotechnology

Ch 11: Principles & Processes, Ch 12: Applications

12
2 MCQ 1 Source-Based

Unit X: Ecology & Environment

Ch 13: Organisms & Populations, Ch 14: Ecosystem, Ch 15: Biodiversity, Ch 16: Environmental Issues

10
2 MCQ 1 Short Answer

Biology-specific generation features

  • Pedigree chart questions: Auto-generated pedigree diagrams for autosomal dominant, recessive, X-linked inheritance patterns with 3–4 sub-questions
  • Diagram labelling: TS of ovary, TS of testis, DNA replication fork, lac operon, restriction enzyme maps — clean vector diagrams, not photographs
  • Case-based passages: Scientific passage on biotechnology applications or ecological scenarios followed by 4 MCQ/VSA sub-questions
  • Assertion-Reasoning: Biology-specific A-R pairs testing understanding of exceptions (e.g., RNA-based inheritance, convergent evolution)

Sample Generated Questions — with Marking Scheme

These are representative examples of what SchoolDeck generates. Each question type shown below appears in the actual output with a complete, board-standard answer key.

Physics — Case-Based Question (4 marks) | Section D Unit 3: Ray Optics

Passage: A converging lens of focal length 10 cm is placed at a distance of 15 cm from an object. A student observes that the image formed is real, inverted, and magnified. The student then places a concave mirror of radius of curvature 30 cm behind the lens, with its reflecting surface facing the lens.

Questions based on the above:

(i) What is the position of the image formed by the lens alone? (1 mark)

(ii) What is the nature of the image formed by the lens? (1 mark)

(iii) (a) Using the mirror formula, find the position of the final image formed by the mirror if the image from the lens acts as the virtual object. (2 marks)

OR

(iii) (b) Define power of a lens and state its SI unit. A system of two lenses has a combined power of +5D. If one lens has a power of +8D, find the focal length of the second lens. (2 marks)

Marking Scheme

(i) Using lens formula: 1/v – 1/u = 1/f → v = +30 cm (image at 30 cm on other side) — 1 mark

(ii) Real, inverted, magnified (m = –2) — 1 mark

(iii)(a) Mirror: f = –15 cm, u = –(distance of lens image from mirror). Step 1: find u correctly — ½ mark. Apply mirror formula — ½ mark. Final answer with sign — 1 mark — 2 marks total

Chemistry — Short Answer Numerical (3 marks) | Section C Physical Chemistry: Electrochemistry

The molar conductivity of 0.025 mol/L methanoic acid is 46.1 S cm² mol⁻¹. Calculate its degree of dissociation and dissociation constant. Given that λ°(H⁺) = 349.6 S cm² mol⁻¹ and λ°(HCOO⁻) = 54.6 S cm² mol⁻¹.

Step-wise Marking Scheme (CBSE Protocol)

Step 1 (1 mark): λ°(HCOOH) = λ°(H⁺) + λ°(HCOO⁻) = 349.6 + 54.6 = 404.2 S cm² mol⁻¹

Step 2 (1 mark): α = Λm / Λ°m = 46.1 / 404.2 = 0.114 (degree of dissociation = 11.4%)

Step 3 (1 mark): Ka = Cα² / (1–α) = (0.025 × 0.114²) / (1 – 0.114) = 3.67 × 10⁻⁴ mol/L

Note: Full marks awarded if correct method used even if numerical error in one step.

Biology — Assertion-Reasoning MCQ (1 mark) | Section A Unit VII: Genetics & Evolution

Read the following Assertion (A) and Reason (R) and select the correct answer:

Assertion (A): In a cross between a red-flowered plant (RR) and a white-flowered plant (rr), the F₂ generation shows a 1:2:1 ratio of genotypes but a 3:1 ratio of phenotypes.

Reason (R): The red allele (R) shows complete dominance over the white allele (r).

(A) Both A and R are true and R is the correct explanation of A.

(B) Both A and R are true but R is NOT the correct explanation of A.

(C) A is true but R is false.

(D) A is false but R is true.

Answer & Marking Scheme

Correct Option: (A) — 1 mark for correct option only. No partial marks for MCQs.

Explanation for teacher: The F₂ genotype ratio (1 RR : 2 Rr : 1 rr) is always 1:2:1. The 3:1 phenotype ratio occurs because RR and Rr both appear red (complete dominance). The reason correctly explains why phenotypic ratio differs from genotypic ratio.

The complete generated paper includes 35+ questions across all sections with a full answer key and marking scheme. The paper is print-ready as a PDF and editable as a DOCX.

See a Full Paper in the Demo →

How a Science HOD uses SchoolDeck to set papers

A typical workflow for a full-length Class 12 Physics mock paper, from start to print.

1

Select subject & paper type

Choose Physics (042), select "Full Board Mock (70 marks)" or a chapter-specific DPP. Set the academic year to apply the correct syllabus version.

2

Set difficulty distribution

Adjust the Easy/Average/Difficult slider (default: 20/60/20 matching CBSE guidelines). For a remedial test, shift to 50/40/10.

3

Review and adjust

The generated paper appears on screen. Swap any question you don't want with one click — the replacement matches the same topic and marks value. Add your school name and logo.

4

Download Set A, B, C

All three sets download as separate PDFs. The marking scheme is generated per set. Archive the paper for audit or CBSE inspection records automatically.

⏱️

Total time for a 70-mark Physics board mock: under 4 minutes

Compared to 3–5 hours setting the same paper manually from textbooks and past papers. The time saving compounds — for 3 subjects × 4 unit tests + 2 mock exams per year, that's approximately 70 hours of HOD time recovered annually.

More question paper generators for Class 12

Subject-specific generators for every Class 12 stream. Each one follows the CBSE 2025-26 blueprint for that subject.

Frequently Asked Questions

Questions Class 12 Science HODs and teachers ask before using SchoolDeck.

Does the Physics paper follow the exact CBSE 2025-26 blueprint?

Yes. The Physics (042) paper is generated as a 70-mark theory paper with the unit weightage from the latest CBSE circular: Unit 1 Electrostatics & Current Electricity (16 marks), Unit 2 Magnetic Effects & EMI (17 marks), Unit 3 Optics (18 marks), Unit 4 Dual Nature, Atoms & Nuclei (12 marks), and Unit 5 Electronic Devices (7 marks).

The section structure is also fixed to the CBSE pattern: Section A (16 × 1 mark MCQs and Assertion-Reasoning), Section B (5 × 2 marks Very Short Answer), Section C (7 × 3 marks Short Answer), Section D (2 × 4 marks Case-Based), and Section E (3 × 5 marks Long Answer with internal choice).

50% of the 70 marks are competency-based as per the 2025-26 mandate — this includes all Section A questions being application-level rather than recall, both Section D case-based questions, and at least one source-based question in Section C or E.

How does the step-wise marking scheme work for Physics numericals?

For a 3-mark Physics numerical, the CBSE step-marking protocol awards marks as follows: 1 mark for correctly writing the relevant formula or stating the principle, 1 mark for correct substitution of values with proper units, and 1 mark for the final numerical answer with correct SI units.

For 5-mark derivations (such as "derive the expression for the magnetic field at the centre of a circular loop"), the marking scheme typically distributes marks as: 1 mark for the correct diagram with labels, 2 marks for the derivation steps, 1 mark for the final expression, and 1 mark for a specific case or numerical application at the end.

The SchoolDeck-generated marking scheme follows this protocol exactly, so teachers marking papers against the key award marks consistently across sections. This is especially important in multi-teacher departments where marking consistency matters for board audit purposes.

Are Chemistry organic mechanism questions generated correctly?

Yes. Organic Chemistry questions include reactions from the CBSE Class 12 syllabus: nucleophilic substitution (SN1 and SN2) for haloalkanes, aldol condensation and Cannizzaro reaction for aldehydes and ketones, esterification and amide bond formation for carboxylic acids, and Hofmann bromamide degradation for amines.

Reaction mechanism questions are formatted with the reactants, reagents/conditions, and the expected product. The answer key shows the complete mechanism with correct arrow notation in the PDF. IUPAC names in questions and answers follow the 2013 IUPAC recommendations as used in NCERT Class 12 Chemistry textbooks.

For Physical Chemistry numericals, all values are verified to produce realistic, non-trivial answers. The system won't generate a concentration that produces a negative pH or a reaction rate that violates the Arrhenius equation.

What Biology diagrams are included and how do they print?

Diagrams are vector-based (SVG), not photographs or scanned images. This means they print cleanly at any size — on a standard school photocopier printing 100 copies, every diagram will be sharp. The diagrams available include: transverse section of ovary (Unit VI), transverse section of testis, double helix DNA structure with replication fork, lac operon schematic, T.S. of leaf showing stomata, pedigree charts (auto-generated for specific inheritance patterns), restriction enzyme map, food chain and food web diagrams, and ecosystem energy flow pyramids.

Labelling questions are structured with arrows pointing to blank spaces on the diagram, with the label list provided below — this is the standard CBSE format for 2-mark diagram questions. The marking scheme lists the expected labels in order.

Can we generate chapter-wise tests in addition to full board mocks?

Yes. In addition to full 70-mark board pattern mocks, you can generate chapter-specific tests for any unit in Physics, Chemistry, or Biology. For example, a 20-mark Unit Test on Electrochemistry only, or a 15-mark test covering just Genetics (Ch 5 and Ch 6 of Biology).

You can also generate Daily Practice Problems (DPPs) — typically 10 questions covering a single chapter at a specific difficulty level. This is useful for revision classes where teachers want targeted practice material without setting a full exam.

Does the practical and internal assessment component get covered?

Yes. The 30-mark practical component is supported for all three subjects. For Physics, this includes a Viva-Voce question bank with 15–20 questions per standard CBSE experiment (e.g., metre bridge, potentiometer, glass prism), observation record templates, and investigatory project assessment rubrics.

For Chemistry, the generator produces practical-based questions on qualitative analysis (salt identification), titration calculations, and thin-layer chromatography. For Biology, structured observation sheets for experiments (osmosis in potato cells, spotting of different stages of mitosis, identification of specimens) are generated with the expected observations and conclusions pre-filled for the teacher's reference.

Can we add our school's branding and is the paper archive-ready for CBSE inspection?

Yes. Upload your school logo and set the header format once — it applies to every paper generated thereafter. The header includes school name, subject code, class, time allowed, and maximum marks in the standard CBSE format.

Every paper generated is automatically archived in the school's SchoolDeck account with the date, subject, class, and the teacher who generated it. For CBSE inspections or accreditation visits, the archive is searchable and can be exported as a PDF bundle covering the full academic year's assessment records — no manual compilation needed.

Used by science departments across India

500+
Schools on SchoolDeck
2L+
Students covered
<2 min
Average paper generation time
3 sets
Generated simultaneously

Used by CBSE-affiliated schools across Tamil Nadu, Karnataka, Maharashtra, Delhi, Telangana, and other states. The generator is also used by KV and NVS schools for internal assessments.

See a Class 12 Science paper generated in the demo

We'll generate a full Physics, Chemistry, or Biology mock paper live — using your school's chapter coverage and difficulty settings — so you see exactly what the output looks like before you commit.

No commitment required. Setup takes 7 days.