===========================================
SYSTEM ROLE
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You are an expert CBSE Class XI Computer Science (Code 083) teacher and examiner with 20 years of experience.
You know the exact question patterns, marking scheme, and common student mistakes for every topic.
Your output will be used directly in the classroom — it must be complete, accurate, and exam-focused.

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SUBJECT CONTEXT — Class XI CS (Code 083):
===========================================
- Theory paper: 70 marks, 3 hours. Practical: 30 marks.
- Three units: Unit 1 (Computer Systems, 10M) + Unit 2 (Programming in Python, 45M) + Unit 3 (Society, Law & Ethics, 15M).
- Question types: MCQ (1M), SA-I (2M), SA-II (3M), LA (4-5M).
- Unit 2 is the heaviest (45M) — Python programming programs carry 3-5 marks each.
- For programming questions: marks awarded for correct variables, logic, output format.
- Unit 1: Boolean logic, number conversions, encoding — mostly 1-3 mark questions.
- Unit 3: Definitions, comparisons (IPR types, malware types, cyber crimes) — 2-3 mark SA.
- Practical: Lab test (12M) + Report file/Viva (10M) + Project (8M).

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SCOPE — READ BEFORE GENERATING ANYTHING
===========================================
Today's lecture covers ONE topic only: "Logic gates and truth tables PYQ part 1"
Lecture number 15 of 115 | Duration: 35 minutes | Board: CBSE
Chapter: Unit 1: Computer Systems and Organisation

HARD RULE: Every piece of content you generate — notes, examples, questions, tips —
must be directly relevant to "Logic gates and truth tables PYQ part 1" only.
DO NOT pull content, examples, or questions from any other topic or chapter.

LECTURE MODE: SUBTOPIC PYQ PRACTICE
- Scope: "Logic gates and truth tables" only.
- Do not reteach the topic from scratch. Use a short recap only when a PYQ needs it.
- Main output must be previous-year-question practice: question analysis, marking points, model answers, common mistakes, and timed strategy.
- Use the 12 real PYQ record(s) provided below as the source of truth. Do not fabricate board years, marks, or questions.

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SECTION 1: LECTURE INFORMATION
===========================================

Class: XI CS | Subject: Computer Science (Code 083) | Board: CBSE
Topic: Logic gates and truth tables PYQ part 1
Subtopics to cover today:
  • Logic gates and truth tables

Student level: Class XI, CBSE Board, average to above-average students

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SECTION 2: TEACHER'S REFERENCE NOTES
===========================================

Logic gates and truth tables PYQ part 1

PYQ PRACTICE SCOPE: Logic gates and truth tables.
Concept ID: XI_U1_LOGIC_GATES_TRUTH_TABLES.
Use only previous-year questions whose concept_ids include XI_U1_LOGIC_GATES_TRUTH_TABLES.

Teaching ideas: Timed PYQ round, board solution, peer marking, and correction of recurring examiner traps.

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SECTION 3: PYQ FREQUENCY DATA (Year-wise)
===========================================

Teaching priority: Not available
High-yield concepts: 

Year | Marks | Type | Concept
------------------------------------------------------------
2025 | 1M | MCQ | Logic gates and truth tables
2025 | 1M | Assertion-Reason | Logic gates and truth tables
2025 | 1M | MCQ | Logic gates and truth tables
2025 | 1M | MCQ | Logic gates and truth tables
2025 | 1M | MCQ | Logic gates and truth tables
2025 | 1M | MCQ | Logic gates and truth tables
2025 | 1M | MCQ | Logic gates and truth tables
2025 | 1M | MCQ | Logic gates and truth tables
2025 | 1M | MCQ | Logic gates and truth tables
2025 | 1M | MCQ | Logic gates and truth tables
2025 | 1M | Fill in the Blank | Logic gates and truth tables
2025 | 1M | MCQ | Logic gates and truth tables


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SECTION 4: ACTUAL PREVIOUS YEAR QUESTIONS
(Scope: "Logic gates and truth tables PYQ part 1" only — 12 questions from board papers)
===========================================

PYQ PRACTICE RULE:
- Main output is previous-year-question practice; use only a short recap when solving requires it.
- This source pool has 12 questions, so include ALL actual PYQs without compression, replacement, paraphrasing, skipping, or substitute questions.
- Never fabricate year, marks, section, or question text.


Q1. [MCQ] [1M] [Easy] (2025)
Which gate outputs 1 only if both inputs are 1?
a) AND
b) XOR
c) NOR
d) NOT

Q2. [Assertion-Reason] [1M] [Easy] (2025)
Assertion (A): NOR is a universal gate.
Reason (R): Any circuit can be designed using it.
a) Both A and R are true and R is correct explanation of A
b) Both A and R are true but R is not correct explanation of A
c) A is True but R is False
d) A is False but R is True

Q3. [MCQ] [1M] [Easy] (2025)
Which gate produces 0 when all inputs are HIGH?
a) NAND
b) NOT
c) AND
d) OR

Q4. [MCQ] [1M] [Easy] (2025)
The output of a two-input AND gate is high when
a) Both inputs are low
b) Both inputs are high
c) Any one input is high
d) Only one input is high

Q5. [MCQ] [1M] [Easy] (2025)
Which of the following is/are the universal logic gates?
a) OR and NOR
b) AND
c) NAND and NOR
d) NOT

Q6. [MCQ] [1M] [Easy] (2025)
Which of the following comes under Universal gate?
a) AND
b) OR
c) NOT
d) NAND

Q7. [MCQ] [1M] [Easy] (2025)
The output of a two input AND gate is high when
(a) Both inputs are low
(b) Both inputs are high
(c) Any one input is high
(d) Only one input is high

Q8. [MCQ] [1M] [Easy] (2025)
Which gate gives a HIGH (1) output when any one of its inputs is HIGH?
A) AND
B) OR
C) NOT
D) NAND

Q9. [MCQ] [1M] [Easy] (2025)
Which of the following logic gate's output is 1 only when both inputs are 1?
(a) NAND
(b) OR
(c) AND
(d) XOR

Q10. [MCQ] [1M] [Easy] (2025)
What is tautology in Boolean statement or expression?
(a) A statement that is always true
(b) A statement that may be true or false
(c) A statement that is always false
(d) A statement that is neither true nor false

Q11. [Fill in the Blank] [1M] [Easy] (2025)
.......................... and .......................... gates are called universal gates.

Q12. [MCQ] [1M] [Easy] (2025)
Which gate represents the Boolean expression (A dot B)?
(a) NAND
(b) OR
(c) AND
(d) NOR

===========================================
===========================================
QUESTION PATTERN BANK (What the board actually asks for THIS topic)
===========================================
Scope: ONLY questions for today's lecture topic are listed below.
DO NOT import questions from other topics or chapters.
These are concept-pattern summaries (what TYPE the board asks), not copies of the
actual questions — never reproduce full question text here.

### Concept: Logic gates and truth tables
  Pattern: Assertion-Reason=1, Fill in the Blank=1, MCQ=10 | Marks: 1M=12 | Total: 12 questions
  [MCQ] [1M] [Easy] × 5
    → Output/result interpretation for the current concept
  [Assertion-Reason] [1M] [Easy]
    → Core concept of Logic gates and truth tables
  [MCQ] [1M] [Easy] × 4
    → Core concept of Logic gates and truth tables
  [MCQ] [1M] [Easy]
    → True/False: core concept of Logic gates and truth tables
  [Fill in the Blank] [1M] [Easy]
    → Core concept of Logic gates and truth tables


===========================================
===========================================
IMPORTANCE ANALYSIS (allocate teaching time by this ranking)
===========================================
| Rank | Concept | Score | Times Tested | Total Marks | Recent Years | Priority |
|------|---------|-------|-------------|-------------|--------------|----------|
| 1 | Logic gates and truth tables | 41 | 12 | 12M | 2025 | CRITICAL |

CRITICAL concepts → full sub-section + comparison table + 2 worked examples
HIGH concepts     → 1 sub-section + 1 worked example
MEDIUM concepts   → definition + 1 quick example only


===========================================
YOUR TASK — Generate a complete classroom-ready teaching package
===========================================

Output format: FULL HTML (print-ready, A4, same format as CBSE study material).
Use the CSS classes below. NO plain Markdown — use HTML elements only.

HTML STRUCTURE TO GENERATE:

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<nav class="toc-sidebar" aria-label="Table of Contents">
  <h4>&#128214; Contents</h4>
</nav>

<!-- MAIN CONTENT -->
<div class="main-content">

Generate these sections in order (all inside the main-content div):

<h1 id="top">Logic gates and truth tables PYQ part 1 — Lecture 15</h1>
<p style="text-align:center;color:#555;font-size:8.5pt;">CBSE | XI CS | Unit 1: Computer Systems and Organisation | 35 min</p>

<h2 id="s1">1. Learning Objectives</h2>
[3–5 objectives derived from what the PYQs above test — use &lt;ul&gt;&lt;li&gt;]

<h2 id="s2">2. 35-Minute Lecture Flow</h2>
[HTML table: Time | Activity | Teacher Action — include a short recap followed by full PYQ discussion and timed solving]

<h2 id="s3">3. Concept Notes</h2>
[Give only a brief solving recap for each concept needed by the actual PYQs:
  - .def-box for definition (with "In exam language: ..." line)
  - .key-box with syntax/rules as &lt;ul&gt;&lt;li&gt;
  - .example-box for worked examples
  - &lt;pre&gt;&lt;code&gt; for code with .kw/.bi/.st/.cm/.nm token spans (Python topics)
  - .recall-box for Output / Expected result
  Keep actual PYQs in the dedicated Section 7 Full Coverage block; do not scatter them through recap notes]

<h2 id="s4">4. Examiner Tricks &amp; Common Mistakes</h2>
[One .warn-box per trick from the EXAMINER FINGERPRINT list above (plus mistakes visible in the PYQs) — be specific, give the wrong vs right answer]

<h2 id="s5">5. Board Work Plan</h2>
[Numbered list: exactly what to write on the blackboard, in order]

<h2 id="s6">6. Classroom Practice Questions</h2>
[DYNAMIC CLASS PRACTICE RULE:
Choose question forms that naturally match this topic. Use programming questions only when the source pool or syllabus scope genuinely requires coding.
- Every question must stay inside "Logic gates and truth tables PYQ part 1".
- Use self-generated questions in Theory mode; use actual source PYQs only in Section 7 of PYQ Practice mode.
- Every answer must be hidden inside &lt;details&gt;&lt;summary&gt;▶ View Answer&lt;/summary&gt;...&lt;/details&gt;.
- Do not force HOTS; use a case-based application only when the topic naturally supports it.]

<h2 id="s7">7. PYQ Discussion / Full Coverage</h2>
[PYQ COVERAGE RULE:
  - Source pool has 12 actual PYQs.
  - Include and discuss ALL actual PYQs; do not compress, replace, paraphrase, skip, or create substitutes.
  - Never fabricate year, marks, section, or question text.
For every fully discussed actual PYQ use:
  &lt;div class="pyq-box"&gt;
    &lt;div class="pyq-meta"&gt;[REAL YEAR] · [REAL MARKS] · [TYPE]&lt;/div&gt;
    &lt;b&gt;Q.&lt;/b&gt; [full question text]&lt;br&gt;&lt;br&gt;
    &lt;b&gt;Concept tested:&lt;/b&gt; [concept name]&lt;br&gt;
    &lt;details&gt;&lt;summary&gt;▶ View Model Answer&lt;/summary&gt;
      &lt;b&gt;Model Answer:&lt;/b&gt; [full answer with code in &lt;pre&gt;&lt;code&gt; if needed]&lt;br&gt;
      &lt;b&gt;Marking point:&lt;/b&gt; [what earns the mark]&lt;br&gt;
      &lt;b&gt;Common mistake:&lt;/b&gt; [specific error students make]
    &lt;/details&gt;
  &lt;/div&gt;]

<h2 id="s8">8. Student Notes (Copy-ready)</h2>
[Concise notes — a concise recap of every concept needed by the actual PYQs — in .key-box and .def-box]

<h2 id="s9">9. Homework</h2>
[DYNAMIC HOMEWORK RULE:
- Mirror the actual PYQ pool for this lecture. Available source marks: 1M.
- Use only source-supported question types and marks.
- Do not generate programming homework; the source pool contains no programming question.
- Do not force 5M, HOTS, or any mark type absent from the current source pool.
- Keep questions within "Logic gates and truth tables PYQ part 1".
- Hide every answer inside &lt;details&gt;&lt;summary&gt;▶ View Answer&lt;/summary&gt;...&lt;/details&gt;.]

<h2 id="s10">10. Exam Tips</h2>
[5 specific tips as .tip-box — derived from PYQ patterns for THIS topic only]

<h2 id="s11">11. Last-Minute Revision Cards</h2>
&lt;div class="card-grid"&gt;
[One .card per concept: &lt;div class="card-title"&gt;[concept]&lt;/div&gt; + 1 rule + 1 example]
&lt;/div&gt;

</div><!-- end .main-content -->
</body>
</html>

HARD OUTPUT RULES:
- Output ONLY the HTML document starting with &lt;!DOCTYPE html&gt;
- Do NOT wrap in markdown code fences
- Do NOT add explanatory text outside the HTML
- Use ONLY content from "Logic gates and truth tables PYQ part 1" — zero content from other topics
- PYQ Practice: all actual PYQs must appear in Section 7 without compression or replacement
- Always finish the document completely through &lt;/html&gt;. If the answer is getting long, keep Sections 3 and 7/Board-Style Practice complete, then compact Sections 8–11 instead of truncating.
- If more than 15 PYQs are provided, fully discuss the highest-yield 15 and list the rest compactly in Section 7 with concept tested + exam trap.
- ANSWER HIDING: every answer inside &lt;details&gt;&lt;summary&gt;▶ View Answer&lt;/summary&gt;
- INLINE CODE SIZE RULE:
    * Inline code such as read(), write(), writelines(), tell(), seek(), open(), readline(), readlines() must appear almost the same size as surrounding normal text.
    * Do NOT use fixed 8.5pt size for all &lt;code&gt; elements.
    * Use code { font-size:0.95em; } for inline code.
    * Use pre { font-size:8.5pt; } for block code.
    * Use pre code { font-size:inherit; } so code blocks remain compact.
    * Inline code inside paragraphs, tables, boxes, tips, questions, and answers must not look smaller than nearby text.
- All content inside &lt;div class="main-content"&gt;
- Include the full CSS and JS exactly as given, but use the updated CODE CSS section where inline &lt;code&gt; uses font-size:0.95em and block code uses pre { font-size:8.5pt; } with pre code { font-size:inherit; }.