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Very Short Answers - Matter In Our Surroundings, Science, Class 9 PDF Download

Q1. Define matter.
Ans.
Anything that occupies space and has mass is called matter.

Q2. State different states of matter with an example.
Ans.
Matter has three different states

Very Short Answers - Matter In Our Surroundings, Science, Class 9

Q3. What is diffusion?
Ans.
The intermingling of molecules of one substance with that of the other is called diffusion.

Q4. What happen to the rate of diffusion if the temperature is increased?
Ans.
With increased temperature, the rate of diffusion also increases as the particles gain energy and vibrate more.

Q5. Name the state of matter that have the tendency to maintain their shape when subjected to outside force.
Ans.
Solid.

Q6. Define melting point.
Ans.
The minimum temperature at which a solid melts to become a liquid at the atmospheric pressure is called its melting point.

Q7. Define boiling point.
Ans.
The temperature at which a liquid starts boiling at the atmospheric pressure is known as its boiling point.

Q8. Define latent heat of vaporization.
Ans.
Latent heat of vaporization is the heat energy required to change 1 kg of a liquid to gas at atmospheric pressure at its boiling point.

Q9. Define latent heat of fusion.
Ans.
Latent heat of fusion is the amount of heat energy required to change 1 kg of solid into liquid at atmospheric pressure at its melting point.

Q10. Define sublimation.
Ans.
Sublimation is the change of gaseous state directly to solid state without going through liquid state.

Q11. What is dry ice?
Ans.
Solid carbon dioxide obtained by cooling and applying pressure on carbon dioxide gas. It does not melt so it is called dry ice.

Q12. What is humidity?
Ans.
The air holds water vapour, this air with water is called humid air and the amount of water vapour present in air is called humidity.

Q13. Give two properties of solid.
Ans.
(1) Solids have fixed shape and are rigid. (2) Solids cannot be compressed.

Q14. What will happen if the pressure is reduced on solid carbon dioxide (dry ice)?
Ans.
If the pressure is reduced on solid carbon dioxide it will directly change into gaseous state without melting.

Q15. Name any three substances that show sublimation.
Ans.
Ammonium chloride, camphor and naphthalene balls.

Q16. Sponge is solid, but we can still compress it. Why?
Ans.
Sponge is a solid with minute pores in it. When we press the sponge the air present in these pores is released out and hence we are able to compress it.

Q17. What is normal atmospheric pressure?
Ans.
The atmospheric pressure at sea level is 1 atmosphere and taken as the normal atmospheric pressure.

Q18. What is Kelvin?
Ans.
Kelvin is the SI unit of temperature (0°C = 273 K).

Q19. Give two examples of diffusion.
Ans.
Milk drops dissolved in water and perfume sprayed in a room.

Q20. Give the temperature at which water exists in two different phases/states.
Ans.
At 0°C water can be in solid or in liquid state. At 100°C water can be in liquid or in gaseous state

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FAQs on Very Short Answers - Matter In Our Surroundings, Science, Class 9

1. What is matter and why is it important?
Ans. Matter refers to anything that has mass and occupies space. It can exist in various forms such as solid, liquid, or gas. Matter is important because it is the building block of everything in the universe, including living organisms and non-living objects. Understanding matter helps us comprehend the physical properties and behavior of substances.
2. What are the three states of matter?
Ans. The three states of matter are solid, liquid, and gas. Solids have a fixed shape and volume, with particles closely packed together. Liquids have a definite volume but no fixed shape, with particles loosely packed and able to flow. Gases have neither a fixed shape nor volume, with particles widely spaced and constantly moving.
3. What is the difference between physical and chemical changes in matter?
Ans. Physical changes in matter are reversible changes that affect the physical properties of a substance without altering its chemical composition. Examples include changes in state, such as melting or boiling. Chemical changes, on the other hand, are irreversible changes that result in the formation of new substances with different chemical properties. Examples include burning, rusting, or fermentation.
4. How does temperature affect matter?
Ans. Temperature affects matter by influencing the kinetic energy of its particles. When the temperature increases, the particles gain energy and move faster, causing substances to expand and change from one state to another (e.g., from solid to liquid or gas). Conversely, when the temperature decreases, the particles lose energy, leading to contraction and changes in state (e.g., from gas to liquid or solid).
5. What is the significance of the concept of matter in our daily lives?
Ans. The concept of matter is significant in our daily lives as it helps us understand and explain various phenomena and processes. For example, knowing the properties of different states of matter enables us to cook, clean, and use various materials effectively. It also helps in understanding weather patterns, the behavior of substances in our environment, and even the functioning of our own bodies.
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