Matter in Our Surroundings
Uttar Pradesh Board · Class 9 · Science
Flashcards for Matter in Our Surroundings — Uttar Pradesh Board Class 9 Science. Quick Q&A cards covering key concepts, definitions, and formulas.
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Explore the full setWhat is matter? Give examples.
Answer
Matter is anything that occupies space and has mass. Examples include air we breathe, food we eat, stones, clouds, stars, plants, animals, water droplets, and sand particles. Everything in the univers…
What are the Panch Tatva according to ancient Indian philosophers?
Answer
The Panch Tatva are five basic elements according to ancient Indian philosophers: air, earth, fire, sky, and water. They believed that everything, living or non-living, was made up of these five basic…
What happens when salt is dissolved in water? What does this tell us about matter?
Answer
When salt is dissolved in water, it disappears and spreads throughout the water without changing the water level. This shows that matter is made up of tiny particles, and the salt particles fit into t…
How small are the particles of matter? Give evidence.
Answer
Particles of matter are extremely small - beyond our imagination. Evidence: Just 2-3 crystals of potassium permanganate can color about 1000 L of water even after repeated dilutions. This shows millio…
What is diffusion? Give an example.
Answer
Diffusion is the intermixing of particles of two different types of matter on their own. Example: The smell of incense stick spreading throughout the room, or ink spreading in water without stirring.
Why does diffusion occur faster at higher temperatures?
Answer
At higher temperatures, particles have more kinetic energy and move faster. This increased movement allows them to intermix more quickly. For example, copper sulphate crystals diffuse faster in hot wa…
Do particles of matter attract each other? How do we know?
Answer
Yes, particles of matter attract each other. Evidence: (1) We cannot cut water surface easily, (2) It takes force to break solids like iron nail or chalk, (3) Different materials have different streng…
What are the three states of matter?
Answer
The three states of matter are: (1) Solid - definite shape and volume, (2) Liquid - definite volume but no fixed shape, takes shape of container, (3) Gas - no definite shape or volume, highly compress…
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