- It does not corrode or rust like metals.
- Non-biodegradable and does not decompose naturally.
- Resistant to humidity, heat, and rain.
- It can be made in any desired colour.
- Easily moulded into various shapes.
- Poor conductor of heat and electricity, ideal for insulators.
- Lightweight and easy to carry.
- Durable and long-lasting.
- Cost-effective and widely available.
- Waterproof and resistant to most chemicals.
Topics
Crop Production and Management
- Crop and Its Types
- Soil Formation and Preparation for Agriculture
- Agricultural Implements
- Manuring (Biomanuring)
- Fertilizers
- Methods to Replenish Nutrients in Your Soil
- Improved methods of agriculture
- Food Security
- Weeding
- Harvesting of Crops
- Storage of Food Grains
- Animal Products used as Food
Microorganisms: Friend and Foe
Synthetic Fibres and Plastics
- Fibre
- Fabrics
- Man-made Fibre: Synthetic Fibres
- Rayon
- Nylon
- Dacron, Terylene, Terene
- Man-made Fibre: Plastics
- Biodegradable Plastics
- Harmful Effects of Plastics
- Recycling of Plastic
Coal and Petroleum
- Energy Resources > Conventional energy resources or non-renewable energy resources
- Carbon: A Versatile Element
- Special Features of Carbon
- Non-crystalline/Amorphous Forms: Coal
- Extraction of Coal
- Non-crystalline/Amorphous Forms: Coke
- Petroleum
- Refining of Crude Petroleum
- Conventional Sources of Energy > Natural Gas
- Some Natural Resources Are Limited
Materials: Metals and Non-metals
Combustion and Flame
- Chemical Properties of Carbon Compounds > Combustion
- Precautions and Safety Measures
- Types of Combustion
- Flame
- Fuel
- Types of Fuel
- Fuel Efficiency
Conservation of Plants and Animals
- Deforestation and Its Causes
- Consequences of Deforestation
- Conservation of Forests
- Conservation of Wildlife
- Endemic Species
- Migration
- Recycling of Paper
- Reforestation
Reproduction in Animal
- Fertilization in Human
- Embryo Formation in Viviparous and Oviparous Animals - Young Ones to Adults
Reaching the Age of Adolescence
- Secondary Sex Characteristics
- Role of Hormones in Initiating Reproductive Function
- Reproductive Phase of Life in Humans
- Hormones Other than Sex Hormones
- Role of Hormones in Completing the Life History of Insects and Frogs
- Nutritional Needs of Adolescents
- Personal Hygiene for Adolescence
Cell - Structure and Functions
Force and Pressure
- Force
- Force - Push or Pull
- Forces Are Due to an Interaction
- Exploring Forces
- A Force Can Change the State of Motion
- Force Can Change the Shape of an Object
- Effect of Force
- Types of Forces>Contact and Non-Contact Forces
- Thrust and Pressure
- Pressure of liquid
- Factors Affecting Liquid Pressure
- Atmospheric Pressure
Friction
- Force of Friction
- Factors Affecting Friction
- Friction - A Necessary Evil
- Effects of Friction
- Increasing and Reducing Friction
- Fluid Friction
Sound
Chemical Effects of Electric Current
- Conductor of Electricity: Liquid
- Electricity
- Chemical Effects of Electric Current
- Electrical Conduction in Solids
Some Natural Phenomena
- Lightning and Lightning Safety
- Force of Friction
- Electric Charge
- Types of Charges and Their Interaction
- Transfer of Charges
- Electroscope
- Lightning and Lightning Safety
- Earthquake
- Protection Against Earthquakes
Light
- Climatic Factors > Light
- Reflection of Light
- Terms Used in Reflection of Light
- Law of Reflection of Light
- Types of Reflection
- Multiple Reflections
- Prism
- Dispersion of Light
- The Human Eye
- Care of the Eyes
- Visual Impairment and Braille System
Star and Solar System
Pollution of Air and Water
- Pollution
- Case Study: The Taj Mahal
- Green House Effect
- Preventive Measures of Green House Effect
- Preventive Measures of Global Warming
- Case Study: Ganga Pollution and Ganga Action Plan
- Potable Water
- Purification of Water
- Materials
- Plastic: A Manmade Material
- Properties of Plastic
Maharashtra State Board: Class 8
Materials:
Materials are an essential part of our daily lives, used in everything from building houses to making household items and tools. These materials are broadly classified based on their origin and production process.
- Natural Materials: Materials that are directly obtained from nature without significant alteration by humans. These materials are often raw and form the base for creating other materials. Materials, like wood, water, and rocks, are found in nature and are called natural materials.
- Manmade Materials: Materials that are created or synthesised by humans using natural materials and scientific techniques. These are designed to improve upon the properties of natural materials and meet specific needs. Materials, such as plastic and glass, are created by humans using natural resources and scientific processes in factories; these are called manmade materials.
Maharashtra State Board: Class 8
Plastic: A Manmade Material
Plastic is a manmade material made from organic polymers and exhibits the property of plasticity (can be moulded into shapes).
Plastic material
Plastics have varying structures:
- Some are linear.
- Some are circular.
Types of Plastic Based on Heat Effect:
- Thermoplastics: Plastics that can be softened and reshaped by heating repeatedly. For example: polythene, PVC.
- Thermosetting Plastics: Plastics that cannot be reshaped once moulded. For example: bakelite, melamine.
Maharashtra State Board: Class 8
