cbq-engine

target	495+/500
author	Senior Sibling
name	cbq-engine
description	12th Grade Competency-Based Question (CBQ) Engine. Strategies for Case Studies (Section E), Assertion-Reason, and Data-Interpretation (Physics/Bio/CS).

CBQ Engine — Mastering 12th Grade Competency

CBSE 2026-27 papers are 50% Competency-Based. This means you cannot rely on rote memorization. You must be able to Apply 12th Grade concepts to real-world scenarios, experimental data, and case studies.

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1. Case Study Strategy (Section E - 4 Marks each)

🔭 Physics Case Study

• The Pattern: Usually a passage on a modern application (e.g., MRI using Superconductivity, or Fiber Optics for high-speed internet).
• The Questions: 1 direct, 1 conceptual, and 2 application-based.
• Example Scenario: A passage on Total Internal Reflection in optical fibers.
  • Q1: State the conditions for TIR. (Direct).
  • Q2: Why is the cladding's refractive index lower than the core? (Conceptual).
  • Q3: Calculate the critical angle if $n_{core} = 1.5$. (Numerical).

🧪 Chemistry Case Study

• The Pattern: Passage on an industrial process (e.g., Haber process, Fuel cells) or a complex organic chain.
• Example Scenario: A passage on Electrochemistry in rechargeable batteries.
  • Q1: Define the term 'Primary Cell'.
  • Q2: Write the overall cell reaction during discharging.
  • Q3: Why does the cell potential remain constant in Mercury cells?

🧬 Biology Case Study

• The Pattern: Experimental data or a medical case (e.g., Pedigree analysis or IVF results).
• Example Scenario: Data on Genetics showing a cross between two plants.
  • Q1: Identify the genotype of the F1 generation.
  • Q2: Explain the law of Independent Assortment.
  • Q3: Predict the ratio of the F2 generation using a Punnett Square.

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2. Assertion-Reasoning (AR) Logic (1 Mark each)

The AR questions are the "Mark-Siphoners". You must follow the Senior Sibling 2-Step Check:

1. Independent Verification: Read Assertion (A) and Reason (R) separately. Are they both true?
   • If one is False, the answer is fixed (C or D).
2. The "BECAUSE" Link: If both are True, read them as one sentence: "[A] because [R]".
   • Does it make logical sense?
   • Example: (A) Phenol is more acidic than Alcohols. (R) Phenoxide ion is resonance stabilized.
   • Check: Phenol is more acidic because phenoxide ion is resonance stabilized. (True → Option A).

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3. Data-Interpretation (Computer Science & Physics)

• Physics: Interpreting V-I graphs for non-ohmic conductors or Photoelectric current vs Intensity graphs.
• Computer Science: Interpreting the results of a SQL GROUP BY query on a table of 50+ rows.
• Biology: Interpreting a population growth curve (S-shaped vs J-shaped).

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🚀 The /cbq-practice Command

Use this command to generate a targeted session:

• Input: /cbq-practice physics "Optics" 2
• Output: 2 Case Studies specifically designed to mimic the 2027 Board level, including data interpretation and multi-part questions.

Senior Sibling Tip: In a Case Study, the answer to part (i) often provides a clue or a value needed for part (ii). Solve them sequentially.