Matter in our Surroundings — Flashcards
Karnataka Board · Class 9 · Science
20 flashcards for Matter in our Surroundings (Karnataka Board Class 9 Science) to test yourself on key terms and facts.
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Why does the smell of hot food reach you faster than cold food?
Answer
Hot food particles have more kinetic energy and move faster. They diffuse quickly into air particles and reach our nose in less time. Cold food particles move slowly, so diffusion is slower and smell …
A diver can cut through water but cannot pass through a wooden block. Why?
Answer
Water particles have weak forces of attraction and more space between them, allowing easy movement. Wood particles have strong forces of attraction and are closely packed, making it rigid and difficul…
How does evaporation cause cooling? Explain with an example.
Answer
During evaporation, surface particles absorb energy from surroundings to escape as vapor. This removes heat energy, causing cooling. Example: Sprinkling water on roof during summer cools it as water e…
What happens when you dissolve salt in water? Where does the salt go?
Answer
Salt particles break down and occupy spaces between water particles through diffusion. The salt doesn't disappear - it spreads uniformly throughout water. Water level remains almost same because salt …
Why can a gas be compressed easily but not a solid?
Answer
Gas particles have large spaces between them and weak attractive forces, allowing compression. Solid particles are closely packed with strong attractive forces, leaving no space for further compressio…
What is the process when camphor disappears without melting?
Answer
Sublimation - the direct change from solid to gas without becoming liquid. Camphor particles gain enough energy to overcome attractive forces and change directly to vapor state. The reverse process (g…
Convert 373 K to Celsius scale and explain its significance.
Answer
373 K = 373 - 273 = 100°C. This is the boiling point of water at atmospheric pressure. At this temperature, water particles have enough kinetic energy to overcome attractive forces and change from liq…
Why does ice at 273 K cool drinks more effectively than water at 273 K?
Answer
Ice absorbs latent heat of fusion (334 kJ/kg) to melt into water, removing more heat from surroundings. Water at same temperature can only remove heat through temperature change. Ice provides both lat…
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Sources & Official References
- Karnataka SSLC — kseeb.kar.nic.in
- Dept of Pre-University Education, Karnataka
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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