Characteristics of matter INTRODUCTION: Substances undergo a wide variety of changes. Many changes take place in nature, for example, the change of weather, the change of a plant into a tree, the formation of cloud, the change of a child into an adult etc, which terms as characteristics of matter. Some of these changes are …
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IMAGE FORMED BY PLANE MIRROR Light is a form of energy which excites the sensation of light. We see an object because of the light it reflects due to which image formed by plane mirror. A continuous and great experiment proved that light always travels in a straight line under an …
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REACHING THE AGE OF ADOLESCENCE INTRODUCTION (reaching the age of adolescence) The WORLD HEALTH ORGANISATION (WHO) define adolescence as the period of life between 11 and 19 years of age. Since, adolescence period covers the teen period (13 – 19 years) . Girls and Boys reaching the age of adolescence are called teenagers. This is …
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ANIMAL TISSUE INTRODUCTION On the basis of the function and occurrence ,tissues present in animal body is called animal tissue. These animal tissue is classified into the following four types: EPITHELIAL TISSUE ANIMAL TISSUE: FUNCTIONS: It protects the underlying cells from drying, injury, infections and also from harmful effects of chemicals. TYPES OF EPITHELIAL TISSUE …
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SOLAR SYSTEM DRAWING INTRODUCTION: If we look at the sky of the solar system drawing in a dark and clear night, we will notice that the entire sky dotted with countless stars, some bright and some not so bright . We must notice that the moon is the brightest objects in the night sky. The …
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ESSAY ON ENVIRONMENTAL POLLUTION INTRODUCTION Human activities directly affect the environment. Air and water are the two most important natural resources, whose pollution is frequently in the news in essay on environment pollution. The presence …
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CALORIMETRY INTRODUCTION: Heat is a kind of energy that make a substance colder or hotter while temperature is the degree of hotness or coldness of a substance in calorimetry. DEFINITION OF CALORIMETRY: It is a science of measurement which deals with heat and temperature. We know that one calorie of heat energy is defined …
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CHEMICAL EFFECTS OF ELECTRIC CURRENT Introduction When electric current is passed through conducting liquids, then chemical changes take place. This is called chemical effects of electric current. So, it is important that we should know some new terms like, electrolyte, electrode and electrolytic cell. TERMS RELATED TO CHEMICAL EFFECTS OF ELECTRIC CURRENT: Electrolyte: It is …
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ANGLE OF FRICTION INTRODUCTION: When one body moves over the surface of the other, the surface opposes the relative motion of the moving object. The opposing force is called frictional force in angle of friction. FACTORS AFFECTING FRICTIONAL FORCE: The nature of two surfaces and the force …
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