CBSE Class 9 Science Matter In Our Surroundings Worksheet Set B

CBSE Class 9 Science Worksheet - Matter in Our Surroundings

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Matter in Our Surroundings

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1. Which state of matter is characterized by the following properties :

(0 A substance with a fixed arrangement of particles.

(I'O A substance that has large distances between the particles.

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2. Why the states of matter differ?

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3. Define melting point.

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4. Inspite of being solid a sponge is compressible. Comment.

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5. What produces more severe burns, boiling water or steam?

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6. Arrange the following substances in increasing order of force of attraction between the

particles - water, sugar, and oxygen.

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7. Suggest a method to liquify atmospheric gases.

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8. Arrange the particles of the three states of matter in order of increasing randomness.

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9.What is the name of the process due to which dry ice changes into carbon dioxide gas ?

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10. Name the process which describes the mixing of copper sulphate crystals and water kept in

a beaker on its own ?

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11. Even two-three crystals of potassium permanganate can impart colour to a large

volume of water. Which characteristic property of particles of matter is illustrated by this

observation ? 1

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12. Why do we call sponge a solid when it is easily compressible ?

Exam Questions NCERT Class 9 Science Chapter 1 Matter in Our Surroundings

Question What happens 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.

Question Liquids and gases can be compressed but it is difficult  to compress solids. Why?
Ans : Liquids and gases have intermolecular space; on applying pressure externally on them the molecules can come closer thereby minimizing the space between them. But in case of solids, there is no intermolecular space to do so.

Question A balloon when kept in Sun, bursts after some time. Why?
Ans : The balloon has air filled in it. The balloon when kept in Sun gets heated and the air inside it also gets heated. The molecules of air get energy, and vibrate faster thereby exerting large force on the walls of the balloon. Due to this expansion of gases the balloon bursts.

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

Question. Define matter.
Ans : Anything that occupies space and has mass and is felt by senses is called matter.

Question Why do people perspire a lot on a hot humid day?
Ans : On a hot humid day, due to the heat our body starts sweating and gives cooling effect by evaporation. But the air cannot hold any more water on a humid day and therefore, the sweat or perspiration is seen.

Question Why is it advisable to use pressure cooker at higher altitudes?
Ans : At higher altitudes, the atmosphere pressure is low and the water boils very fast and evaporates at faster rate, therefore, the pressure is required to increase the cooking process and this is done by using pressure cooker which increases the pressure inside the container and cooks food faster.

Question What happens if you put copper sulphate crystals in water?
Ans : Copper sulphate crystals mixed between the spaces of molecules of water and disappear.

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