CBSE Class 10 Science 2026 | Most Repeated PYQs | 10 Years PYQ Marathon | Day 3

CBSE Class 10 Science 2026 | Most Repeated PYQs | 10 Years PYQ Marathon | Day 3
Class 10 Science PYQ 2025 (Set 3131) | Most Important Questions | CBSE Board Exam 2026 Preparation
Set 3131 practice with full concept logic (Chemistry + Biology + Physics) — not just answers, but 360° understanding for CBSE 2026.

Agar aap 2026 board ke liye prepare kar rahe ho, toh 2025 ke PYQ sets practice karna best strategy hai ✅
Is session me humne Set 3131 ko board pattern ke hisaab se solve kiya + confusing topics (Scattering, Solenoid, Refractive Index) ko crystal clear kiya.

⚠️ MUST WATCH (High-Score Sections)
• 1:00:16 Scattering of Light — Blue sky vs White clouds (most common confusion)
• 1:20:16 Solenoid — strength factors + electromagnets (repeated topic)
• 54:33 Refractive Index numericals (formula clarity)

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⏱️ CHAPTERS / TIMESTAMPS (Set 3131 INDEX)
0:00 Intro + Energy Check (2025 PYQ Set Practice)
3:11 Chemical Reactions – Balancing Al + Steam (Metal-Water Reaction Logic)
8:44 Acids Bases Salts – Family of Salts (Identification Trick)
10:20 Metals & Non-metals – Metal Extraction (Reduction with Carbon)
12:13 Carbon & its Compounds – Hydrocarbons & Isomers (Formula Logic)
18:45 Carbon & its Compounds – Hydrogenation of Vegetable Oil (Addition Reaction)
27:12 How do Organisms Reproduce – Female Reproductive System (Concept)
37:27 Control & Coordination – Brain Parts (Cerebrum vs Cerebellum)
43:01 Control & Coordination – Plant Hormones (Growth vs Inhibition)
46:13 How do Organisms Reproduce – Bisexual Flowers (Hibiscus/Mustard)
51:31 Life Processes – Gastric Glands (HCl, Pepsin, Mucus)
54:33 Light – Refractive Index Formula (Numericals)
1:00:16 Light – Scattering of Light (Why Sky is Blue?)
1:10:06 Electricity – Resistance & Wire Stretching Trick
1:14:45 Magnetic Effects – Magnetic Field Lines (Inside vs Outside)
1:20:16 Magnetic Effects – Solenoid Strength + Electromagnets
1:27:31 Our Environment – Aquarium Ecosystem (Biotic vs Abiotic)
1:37:18 Metals & Non-metals – Metals + Nitric Acid (Exception/Trap)
1:46:53 Our Environment – Biodegradable Waste + Jute Bags Logic
1:55:01 Hall of Fame + Homework

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📝 HOMEWORK (Give Answer in comments) | Hint: 1–2 lines
Q1) Blue sky blue kyu dikhta hai aur clouds white kyu?
Q2) Solenoid ka magnetic field strong karne ke 2 factors likho.
Q3) Very dilute HNO3 se H2 gas dene wale 2 metals ke naam likho.
Q4) Gastric glands ke 3 secretions aur unka function (1 line each).

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🏆 HALL OF FAME (Top Performers & best comments with timestamp)
Nikki Tomar, Harikesh, Badmosh, Chill, Satveer, Atharv, Aniket, Vinod,
Prince Kumar, Vikas, Pro, Arya Tripathi, Abhijit, Rajdeep, Mukul, Hridayali,
Raghav, Neha, Gavin Taneja, Priyatam, midknight,arti singh,lavii sharma
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DISCLAIMER: This video is for educational purposes for Class 10 CBSE, ICSE, and State Board students preparing for 2025-26 Exams.
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