Question 5. With the help of an example, explain how diffusion of gases in water is essential? Class 9 Science NCERT Textbook – Page 9 This will also help in various competitive exams also . She dissolved some salt with the help of a glass rod and recorded water level again. Due to this expansion of gases the balloon bursts. a minute ago. Kinetic energy between particles is more than that in solids. (a) 293 K (b) 470 K. You must attend the quiz and test your concepts and knowledge . (a) What is CNG? ... Matter in Our Surroundings (Class - IX) By : Anonymous; 20 min 17 Ques Start Test. kanjetam_97117. 1 kg. Answer: Solids have fixed shape due to strong intermolecular force of attraction between them. Chapter- 1, Matter in Our Surroundings, The following page provides you NCERT book solutions for class 9 SCIENCE, SCIENCE class 9 notes in pdf are also available in the related links between the texts. Interested student can buy science notes for 9 th class. Answer: A —> Liquefication/melting/fusion B —> Vapourisation/evaporation C—>Condensation D—> Solidification E —> Sublimation F —> Sublimation. What are fluids? NCERT Solutions Class 9 Science Chapter 1 Matter in Our Surroundings – Here are all the NCERT solutions for Class 9 Science Chapter 1. (b) an iron almirah is a solid at room temperature. Latent heat: The heat energy that is required to change the state of a substance without causing any ruse in the temperature of the substance is called latent heat. Ex-plane this in detail. Question 18. Buy Books. This contains 10 Multiple Choice Questions for Class 9 Matter In Our Surroundings, Science, Class 9 - Test (mcq) to study with solutions a complete question bank. CLASS - 9 - MATTER IN OUR SURROUNDINGS. Name the factors that affix l evaporation. Answer: The air holds water vapour, this air with water is called humid air and the phenomenon is called humidity. Why are we able to sip hot tea or milk faster from a saucer rather than a cup? But in case of liquids and gases, their molecules have intermolecular space and hence they don’t have large mass concentrated in small volume. Liquids generally have lower density as compared to solids. What is normal atmospheric pressure? (c) solid changes into gas (d) gas changes into solid Question 18. The molecules of air get energy, and vibrate faster thereby exerting large force on the walls of the balloon. Matter In Our Surroundings Share. (b) Suggest one more method of keeping the house cool in summer. This shows that the particles have spaces between them and are continuously moving on their own. Watch Now. Convert the following temperatures to the Celsius scale. This property is called compressibility. Question 15. Enlist four properties of this state of matter. All these topics are included in CBSE solved test papers of class 9 Science chapter Matter in Our … Question 2. The fusion is the process in which (1) Solids have fixed shape and are rigid. This test is a practice test of Matter in our Surroundings (CPE). (a) water boils at 100°C (b) water boils at <100°C What are the characteristics of the particles of matter? Why does temperature remain constant during the boiling of water even though heat is being supplied continuously? (B) The particles of matter have spaces between them. The particles of gases (or vapours) produced by burning the incense stick move rapidly in all directions and mix with the moving particles of air in the room. (b) An iron almirah is a solid at room temperature because melting point of iron is higher than room temperature. Question 3. (i) Rigidity: The tendency of a substance to retain/maintain their shape when subjected to outside force. (b) Air is compressible because it has large intermolecular space. (b) A gas exerts pressure on the walls of the container because the molecules of the gas are in constant random motion due to high kinetic energy. … Predict the nature of the substance. b) Classification of matter :- i) Early Indian philosophers classified in the form of five basic elements as air, earth, fire, sky and water called Panch Tatva. (2) an increase of temperature, Solve ten important MCQ questions of Matter in our Surroundings to score full marks in CBSE Class 9 school exams. Give reasons for the following observation: quiz which has been attempted 8828 times by avid quiz takers. Question 10. The characteristics of the particles of matter are following : (A) Matter consists of tiny particles which cannot be seen by an individual with naked eye. Question 17. These particles have spaces between them. Arrange the following in decreasing order of force of attraction: Water, Salt, Oxygen, and give reasons. 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