Quick Revision Notes – Mensuration 🔹 Plane Figures Closed 2D (two-dimensional) shapes are called plane figures. The boundary of a figure is called its perimeter. The surface enclosed by the boundary is called its area. 🟨 Perimeter 🧭 Definition Perimeter = Length of the boundary of
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Introduction The two World Wars were the most terrible wars in modern history. They changed the world and caused great human suffering.To understand how these wars started, we need to look at what happened in Germany after World War I.In this chapter, we will learn about
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Introduction Our earth is full of amazing natural treasures hidden under the ground. These treasures are called minerals. We also use various types of power resources to make our daily life easier — from switching on a light to driving a car or running a factory.Let’s
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🌟 Why Plants and Animals Need a Transportation System? All living beings need food, oxygen, and water to survive. These must reach each cell of the body for proper functioning. A transport system delivers nutrients, gases, and removes wastes. Animals use blood and vessels, plants use
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Introduction Adolescence is the stage of life between childhood and adulthood. It usually happens between the ages of 11 and 19. Children at this age are called teenagers because these years fall in the “teens.” During this period, the body becomes capable of reproduction and undergoes
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Chapter 1: Motion Brief: Motion describes how objects move – speed, velocity, acceleration, and equations of motion. Formulas & Explanations: Speed – how fast an object moves: s = speed, d = distance, t = time. Velocity – speed with direction: Acceleration – change of velocity
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Centripetal Force Force acting towards the centre of circular path. Example: Moon revolves around Earth due to Earth’s centripetal force. Newton’s Observations Apple falls because Earth attracts it. Apple also attracts Earth (Newton’s 3rd law). Conclusion: All objects attract each other → Gravitational Force. Universal Law
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What Makes Things Visible? We see objects when light from them enters our eyes. Two ways light reaches our eyes: Luminous objects → Emit their own light (Sun, candle, lamp). Illuminated objects → Reflect light from another source (Moon, book, table). In darkness → no light,
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The Rise of the East India Company in India Entry of the East India Company In 1600, Queen Elizabeth I gave the English East India Company the exclusive right to trade with the East. The Company searched for regions where production costs were low. But it
Read MoreSection A – Very Short Answer Questions (1 × 5 = 5 Marks) (Answer each question in one sentence) Define a chemical reaction. Give one example each of an exothermic and an endothermic reaction. What is the difference between a physical change and a chemical change?
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