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(a) liquid (b) solid and liquid (c) liquid and gas, B. Correct Option is : 2. States of Matter ,Matter in Our Surroundings - Get topics notes, Online test, Video lectures, Doubts and Solutions for CBSE Class 9 on TopperLearning. Particles of matter attract each other because of force of attraction. Explanation: When food is sizzling hot, it releases the vapours of its contents. What is the difference between evaporation and boiling? 21. A diver is able to cut through water in a swimming pool. In air particles are in constant motion, C. Collision between the particles of air helps a person to move hand in air, D. In air Interparticle space is large and also there is weak intermolecular force of attraction, A. Activity 1.14 NCERT Science Class 9 Chapter 1 Matter In Our Surroundings. Science Important Questions Class 9 are given below. → Force of attraction between … Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning. To describe all the states of matter and their characteristics, namely, solid, liquid, and gas. Explanation: Naphthalene has a tendency to sublime i.e. Therefore, the size of the naphthalene balls slowly decreases and ultimately they disappear. State Changes:When state changes, heat supplied is used by particles to overcome force of attraction. Matter in our surrounding Worksheet-4 Â The smell of hot sizzling food reaches us several metres away. A cooler is quite effective on a hot and dry day because ______. So the particles are closely packed in solidsThe intermolecular distance is the least.They have definite shape and volume. Predict the nature of the substance. Explanation: Once the change of state of a substance begins or starts, the energy supplied is being used up as latent heat. Why the states of matter differ? 26. That is why, a diver is able to cut through water. Wearing synthetic clothes in summers is usually avoided. Worksheet solutions for chapter: Matter in Our Surroundings for class 9 are provided. The rate of evaporation depends only on the surface area exposed to the atmosphere. Worksheet for chapter: Matter in Our Surroundings is presented below. the properties that we can … 7. Heat supplied during change of state is absorbed as latent heat hence the temperature remains constant, C. Once the boiling point is reached temperature remains constant as water and vapour exist in equilibrium, A. of the presence of plasma in them. For this, it needs some energy which is taken from the palm. Science Class 9 Important Questions are very helpful to score high marks in board exams. However, water is already in the liquid state and has no tendency to change to the vapour state at this temperature. → Lately, scientists are talking about five states of matter or five phases of matter. 17. admin@learnersplanet.com. The number of the particles is related to their size as well as the attractive forces among them. of the presence of protons and neutrons in them. On heating - Temperature increases: When temperature increases, heat is used to increase the motion of the particles.In other words, heat is used to increase the kinetic energy of the particles. Since the kinetic energy of the particles is very high in the vapour state, they can reach us even at a distance of several metres However, when the food is cold, the vapours released will be comparatively less. Free CBSE Class 9 Science Unit 1-Matter - Its Nature & Behaviour Matter in our surroundings Worksheets. Here we have covered Important Questions on Matter In Our Surroundings for Class 9 Science subject. 1. Particles of gases are in random motion, B. 1M 3. Water freezes at 273 k giving out heat to the surroundings, C. Ice condenses absorbing latent heat from the surroundings thus causing cooling, D. Ice melts taking up energy from the surroundings thus causing cooling. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Physical Classification. MCQ Questions for Class 9 Science with Answers were prepared based on the latest exam pattern. Why more serious burns are caused by steam at 1000c than water at same temperature? 4. CBSE Class 9 Science Matter In Our Surroundings Worksheet Set B 1. Why? Cotton, honey, exhaust from chimneys, chalk, iron, air, B. Therefore, it will cause comparatively less cooling. These notes provide the students with the summary of the chapter, important points to remember and detailed explanation of important concepts and derivations for better understanding. 11. Prepared by teachers of the best CBSE schools in India. 16. Usually most of the students tend to become nervous at the times of the board examination. Atmospheric gases be liquefied by _______. Worksheet solutions for chapter: Matter in Our Surroundings for class 9 are provided. Name the factors affecting evaporation. CBSE Class 9 Chemistry Worksheet - Matter In Our Surrounding 1. Why are clothes spread out for drying? A. Therefore, water is dense as compared to ice or ice floats over water. The entire NCERT textbook questions have been solved by best teachers for you. Matter In Our Surroundings Class 9 Notes - Chapter 1. ENROLL. (c) At 100°C, water is present both in the liquid and vapour states. Explanation: Both acetone and perfume are low boiling liquids. 19. Air, exhaust from chimneys, honey, water, chalk, cotton and iron. ② _____ is the process in which the liquid phase changes to gaseous phase at a constant temperature and constant pressure. All solutions are explained well. These are-solids, liquids, gases, plasmas and the Bose–Einstein condensate. There is very less force of attraction between the particles of water, B. Candidates who are ambitious to qualify the Class 09 with good score can check this article for Notes. Â A substance is in liquid state at room temperature and changes into gas upon heating. Inspite of being solid a sponge is compressible. With the help of an activity, show particulate nature of matter. 7 lessons. Actually, at the boiling point liquid and gaseous state of a substance exist in equilibrium. Sugar < Oxygen < water, C. Oxygen< water < sugar D. Water < Oxygen
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