Lines and Angles Line, line segment and ray We come across many shapes in daily life. Consider a triangle, a square or any other shape. To draw any of these figures, one begins with a line or a line segment or a curve. Depending upon the number and arrangement of these lines we get distinct […]
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Simple Equations Introduction to Simple Equations Variables and Expressions Variable is a quantity that can take any value, its value is not fixed. It is a symbol for a number whose value is unknown yet. Expressions are formed by performing operations like addition, subtraction, multiplication and division on the variables. Example: 6x – 3 is
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Data Handling Double Bar Graphs Double bar graphs are an effective tool to compare the values of two quantities for the same observation. For example, consider the marks obtained by five students of a class in two tests. Using a double bar graph, we can analyses which week students had better marks. Double Bar Graphs
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Fractions and Decimals Introduction: Fractions The word fraction derives from the Latin word “Fractus” meaning broken. It represents a part of a whole, consisting of a number of equal parts out of a whole. E.g. : slices of a pizza. 10, 39, 389 To know more about Fractions, visit here. Fractions play an important part
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Forests: Our Lifeline There are three major types of forests- tropical, temperate and boreal forests. Forest profile There are different kinds of plants of varied height and size in the forests. Parts of a tree above the stem, including the branches and leaves are collectively known as the Crown. Trees belonging to the genus Pinus
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Integers Properties of integers For a, b ϵ I, we have: a + b ϵ I a – b ϵ I a × b ϵ I If a, b ϵ I, then a + b = b + a a × b = b × a If a, b, c ϵ I, then a +
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Light Light Reflection of Light Laws of Reflection The laws of reflection are: Types of Reflection Regular Reflection Irregular Reflection or Diffused Reflection Left-Right Inversed Characteristics of an Image Spherical Mirrors Concave Mirror Uses of Concave Mirrors Convex Mirror Uses of Convex Mirrors Types of Images formed by a Mirror Virtual Image Real Image Example:
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Electric Current and its Effects Electric Current The flow of charges through a circuit is called electric current. The SI unit of electric current is ampere and donated by A. The direction of the electric current is conventionally from the positive terminal to the negative terminal of a cell. Electric Current and Its Effects: Electrical
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Motion and Time Motion Examples: Chairs of a dining table, a flower vase, table, blackboard etc. Examples: The blades of a rotating fan, the hands of a working wall clock etc. Slow and Fast Motion Rectilinear Motion Circular Motion Rotational Motion Periodic Motion Speed Average Speed Average speed Total distance covered Total time taken Measurement
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Heat Concept of Heat Temperature Thermometer Clinical Thermometer Laboratory Thermometer Maximum-Minimum Thermometer Scales of Temperaturesss Transfer of Heat Conduction Convection Radiation Examples: SUMMER AND WINTER CLOTHING: Important Questions Question 1. Which of the following is a good conductor of heat? (a) Iron (b) Steel (c) Aluminium (d) All of these Question 2. A device used
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