CBSE Class 8 Science Notes Chapter 18 Pollution of Air and Water Pollution of Air and Water Class 8 Notes Understanding the Lesson 1. Agents or substances that pollute water, air or soil are called pollutants. 2. The term air pollution is defined as the accumulation of harmful substances or increase in the quantity of any…
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CBSE Class 8 Science Notes Chapter 17 Stars and the Solar System Stars and the Solar System Class 8 Notes Understanding the Lesson 1. The science dealing with the study of the universe is called astronomy. 2. The scientist who study the universe are called astronomers. 3. The stars, the planets, the moon and many…
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CBSE Class 8 Science Notes Chapter 16 Light Light Class 8 Notes Understanding the Lesson 1. Light is a form of energy. 2. When light reaches our eyes after striking an object, we are able to see an object. 3. The bouncing back of light into the same medium after it falls on a surface is…
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CBSE Class 8 Science Notes Chapter 15 Some Natural Phenomena Some Natural Phenomena Class 8 Notes Understanding the Lesson 1. Lightning is an electric spark on a huge scale. It is caused by the accumulation of charges in the clouds. 2. Some objects can be charged by rubbing with other objects. These objects are called…
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CBSE Class 8 Science Chapter 14 Notes Chemical Effects of Electric Current Chemical Effects of Electric Current Class 8 Notes Understanding the Lesson 1. The substances that allow the electric current to pass through them are called conductors; e.g., copper, aluminium, etc. 2. The substances that do not allow the electric current to pass through…
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CBSE Class 8 Science Chapter 13 Notes Sound Sound Class 8 Notes Understanding the Lesson 1. Sound is defined as a form of energy that travels through medium in the form of vibrations. 2. A sound can be produced by: beating rubbing blowing plucking 3. The movement that produces sound in rapid to and fro…
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CBSE Class 8 Science Notes Chapter 12 Friction Friction Class 8 Notes Understanding the Lesson 1. Friction opposes the relative motion between two surfaces in contact. It acts on both the surfaces. 2. Friction always acts in a direction opposite to the direction of motion. 3. The force of friction always opposes the applied force.…
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CBSE Class 8 Science Notes Chapter 11 Force and Pressure Force and Pressure Class 8 Notes Understanding the Lesson 1. A push or pull on an object is called force. 2. Forces applied on an object in the same direction add to one another. 3. If two forces act in the opposite directions on an…
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CBSE Class 8 Science Notes Chapter 10 Reaching the Age of Adolescence Reaching the Age of Adolescence Class 8 Notes Understanding the Lesson 1. The period of life, when the body undergoes changes, leading to reproductive maturity, is called adolescence. It begins around the age of eleven and lasts upto eighteen or nineteen years of…
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CBSE Class 8 Science Notes Chapter 9 Reproduction in Animals Reproduction in Animals Class 8 Notes Understanding the Lesson 1. Reproduction is the process of continuation of similar kinds of individuals, generation after generation. In this process, all living beings produce their young ones for continuity of life on the planet earth. 2. There are…
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