Matter in Our Surroundings · Class 9 Science · Chapter 1
🔬 Matter in Our Surroundings
CBSE Class 9 · Science · Chapter 1
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Six free PDFs + an editable PPTX cover every angle of this chapter — read the deck, drill the MCQs, sit the full paper, then check against the marking scheme.
📖Notes Deck
Full lecture deck with teaching paragraphs, misconception red-boxes, and glossary. Read this first.
Download PDF →📝Quick Drill
15 pattern-tagged MCQs with per-Q time budget. Drill under a 20-min timer.
Download PDF →📄Exam Paper
Full exam-pattern paper with sections. Sit it closed-book before checking the marking scheme.
Download PDF →✅Marking Scheme + Topper Templates
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Download PDF →⚡Cheat Sheet
1-page exam-day card: key points, top question patterns, 90-minute revision flow.
Download PDF →👨👩👧For Parents
1-page plain-language parent guide: what's being learned + questions to ask your child.
Download PDF →Top question patterns · CBSE annual / SQP aggregate
| 80% | Why does evaporation cause cooling? Give an example. — High-KE surface particles escape, absorb latent heat from surroundings → surroundings cool. Pair with sweat / matka example. | 3 MARKS |
| 70% | Compare the three states with particle-model reasoning — Table of shape/volume/compressibility/fluidity + one line per state on particle spacing & attraction. | 5 MARKS |
| 65% | Why is temperature constant during melting/boiling? — Heat absorbed = latent heat → used to change state / overcome attraction, NOT to raise temperature. | 3 MARKS |
| 55% | Factors affecting rate of evaporation — Surface area, temperature, humidity, wind speed — state direction of effect for EACH. | 3 MARKS |
| 60% | Convert °C ↔ K / define latent heat of vaporisation — K = °C + 273. Latent heat of vaporisation = heat to convert 1 kg liquid → gas at b.p. with no temp change. | 2 MARKS |
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