10+ Years Board Exam PYQs Decoded by AI | PrepOne

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10+ Years of Board Papers.
Decoded by AI.

Don't just read the solutions. See which topics repeat every year, practice chapter-wise, and get your handwritten PYQ answers graded against the official board rubrics.

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2014–2025 Solved Archive

Chapter-wise Weightage

Official Marking Rubrics

Predictive Topic Analytics

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We fed 5,000+ past year board questions into our AI engine to map the historical DNA of CBSE and Bihar Board exams. PrepOne highlights recurring micro-concepts that statistically carry up to 60% of paper weightage.

Predictive Weightage Engine"Ray Optics and Wave Optics have appeared in 9 out of the last 10 board exam sessions, carrying an average of 14 marks."
One-Tap Smart FilteringFilter 10+ years of papers by chapter, difficulty, bloom's taxonomy, or format (Objective vs Derivations).

Concept Frequency Tracker

Class 12: Moving Charges & Magnetism

94% Recurrence

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Historical marks distribution across CBSE Main & Compartment papers (2015–2024)

Interactive PYQ Solver

Browse official board questions by subject and view predicted recurrences alongside marking schemes.

10+ Years PYQ Predictive Engine

Interactive Past Year Question Bank

2024 CBSE • Physics5 Marks

Ray Optics

A convex lens of focal length 20 cm is placed coaxially with a concave lens of focal length 10 cm at a distance of 10 cm. Find the position of the final image for an object at infinity.

2023 BSEB • Physics5 Marks

Electrostatics

State Gauss's Theorem in electrostatics. Apply it to calculate the electric field due to an infinite plane sheet of uniform surface charge density \sigma.

2024 CBSE • Chemistry3 Marks

Electrochemistry

Derive the relation between standard cell potential $E^\circ_{\text{cell}}$ and equilibrium constant $K_c$. Calculate $K_c$ for Daniel cell at 298 K.

2024 CBSE • Ray Optics

Board Solution & Step Rubric

94% High Recurrence

"A convex lens of focal length 20 cm is placed coaxially with a concave lens of focal length 10 cm at a distance of 10 cm. Find the position of the final image for an object at infinity."

Key Derivation / Formula:

\frac{1}{v_1} - \frac{1}{u_1} = \frac{1}{f_1} \implies v_1 = +20\,\text{cm}

Intermediate Step:

$Distance to concave lens = 20 - 10 = +10 cm (virtual object for 2nd lens).$

Final Result:

\frac{1}{v_2} - \frac{1}{+10} = -\frac{1}{10} \implies \frac{1}{v_2} = 0 \implies v_2 = \infty

Official Board Examiner Rubric:1M for ray diagram + 2M for lens 1 image + 2M for final infinite position.

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2022 Physics Paper Rubric Match

1. Gauss's Law Statement

Matched official formula: $\oint \mathbf{E} \cdot d\mathbf{A} = \frac{q_{\text{enclosed}}}{\varepsilon_0}$

+1 Mark

2. Mathematical Derivation

Missed integration limits $\int_{0}^{R}$ as per 2022 guidelines.

0 Marks

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10+ Years of Board Papers.Decoded by AI.