Introduction Everything in our surroundings are known as matter. They may be the food we eat, the vehicles, the gadgets, the day to day materials that we use, the air we breathe or the water that we drink. All of these things occupy some space and have mass and volume. For instance, in classrooms theContinue reading “Chapter 01––>Matter in Our Surroundings”
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Chapter 02––>Is Matter Around Us Pure?
Introduction Everything around us is made up of matter. For example: – Wood, paper, even human beings are made up of matter. All the matter present around us is not pure. It can be pure or impure. We will try to learn whether matter around is pure or not. And what all techniques we canContinue reading “Chapter 02––>Is Matter Around Us Pure?”
Chapter 03––>Atoms and Molecules
Introduction The entire Universe is composed of matter and energy. Energy is the aptitude to perform a work. On the other hand matter has mass and occupies space. Maharishi kannad postulated that if we go on dividing matter we will derive smaller and smaller particles which on further division gives off further smaller particles finallyContinue reading “Chapter 03––>Atoms and Molecules”
Chapter 04––>Structure of the Atom
Introduction Atoms and molecules are the building blocks of matter. The word atom has been derived from the Greek word “a-tomio” which means “un-cuttable” or “non-divisible”. Earlier it was believed that atoms are indivisible and don’t have any inner structure. At the end of 19th century scientists carried out the experiments which proved that the atomsContinue reading “Chapter 04––>Structure of the Atom”
Chapter 10––>Gravitation
Introduction If earth can attract an apple why not moon or other celestial bodies? If moon is attracted by earth why it does not fall towards it? Why earth is not moving towards apple? These are some questions which came to Newton when he saw an apple falling from a tree. He conjectured that theContinue reading “Chapter 10––>Gravitation”
Chapter 14––>Natural Resources
Introduction to Natural Resources Earth is the only one on which life exists. The resources of the earth are land, water and air. Other resources include fossil fuels, sunlight, wind, minerals, etc. Biotic factors are referred to as living things in the ecosystem. Air, water and soil form the non-living or abiotic components of the biosphere.Continue reading “Chapter 14––>Natural Resources”
Chapter 10–>Light; Reflection and Refraction
Topics In this Chapter Light Nature of Light Light incident on another medium Characteristics of light Properties of light Reflection of light by other media Laws of Reflection Propogation of light Fermat’s Theorem Characteristics of Images Image formation by a plane mirror Principle of Reversibility of light Spherical mirror Relationship between focus and radius ofContinue reading “Chapter 10–>Light; Reflection and Refraction”
Chapter 05––>The Fundamental Unit of Life
Every organism in this universe are made of tiny basic structural units called cells. Cells were discovered by Robert Hooke in 1665. Cells are the building blocks of an element that cannot be seen with naked eyes but can be seen under a microscope. Every living-element is made up of numerous tiny cells. There areContinue reading “Chapter 05––>The Fundamental Unit of Life”
Chapter 06––>Tissue
Introduction Till now we studied that all the organisms are made of cells. On the basis of cell they are divided into unicellular (single-celled) and/or multicellular (two or more celled). Example-Amoeba (unicellular), in case of amoeba all the functions are carried out by the single cell, whether it is digestion, excretion, respiration, but in caseContinue reading “Chapter 06––>Tissue”
Chapter 13––>Why do we fall ill?
Introduction The condition of body to function physically, socially and mentally well is called its health. A body with good physical and mental condition we call it a healthy body. It is not just a body free from disease or weakness but a state of thorough physical, mental and social well-being. A particular abnormal conditionContinue reading “Chapter 13––>Why do we fall ill?”
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