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Gaurav Mavi 6 years, 5 months ago
Posted by Shiv Shankar 6 years, 5 months ago
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Yogita Ingle 6 years, 5 months ago
Cell is the fundamental structural and functional unit of all living organisms. Like humans and animals, plants are also composed of several cells.
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Sia ? 6 years, 5 months ago
A computer network is a digital telecommunications network which allows nodes to share resources.
An excellent example of a network is the Internet, which connects millions of people all over the world.
Posted by Shreyash Tiwari 6 years, 5 months ago
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Sia ? 6 years, 5 months ago
A trade war is an economic conflict resulting from extreme protectionism in which states raise or create tariffs or other trade barriers against each other in response to trade barriers created by the other party.
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Nasrin Narshad 6 years, 5 months ago
Athokpam Abhijeet 6 years, 5 months ago
Yashika Singh 6 years, 5 months ago
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Lalit Lalit 6 years, 5 months ago
Yogita Ingle 6 years, 5 months ago
There are some fibres that are prepared by man by using chemicals. These are called synthetic fibres. These are made of small units that join together to form long chains. Examples of synthetic fibres are rayon, nylon, polyester, acrylic, etc.
Posted by Kanchan Tgh 6 years, 5 months ago
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Yogita Ingle 6 years, 5 months ago
Physical properties of metal
- Metals are solid except mercury that is found in liquid state at room temperature.
- They are hard and tough except sodium and potassium that can be cut with a knife.
- They are lustrous i.e. they shine in light because metals possess free electrons that vibrates on getting in contact with light.
- They have high melting points except caesium and gallium have very low melting point.
- They are good conductors of heat and electricity. The best conductors of electricity are silver and copper whereas lead and mercury are comparatively poor conductors.
Physical properties of non-metals
- Non-metals may be either solids, liquids or gases.
- Solid non-metals are brittle and break down into powdery mass on striking with a hammer except diamond which is the hardest non-metal.
- They have a dull luster but iodine is lustorous.
- They have low melting points except diamond that has very high melting point.
- They are poor conductors of heat and electricity except graphite.
- They are not malleable.
- They are not ductile.
- They are not sonorous.
- Examples are carbon, Sulphur, oxygen, phosphorous and many more.
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Meghna Thapar 5 years, 10 months ago
Types of plastics: Plastics are of two types – thermoplastics and thermosetting plastics.
- Thermoplastics – Thermoplastics get soft when heated and hard again when they are cooled. Example – polythene and poly vinyl chloride. Such plastics are used in making toys, containers, plastic bags, raincoats and combs. Thermoplastics are used in making those articles which do not get too hot, and are flexible.
- Thermosetting plastics – Thermosetting plastics get soft only one, the first time they are heated after being made. When such plastics are heated for the first time, they become soft and can be moulded to make an article of any desired shape. On cooling, the article becomes hard and rigid. Example – Bakelite and melamine. They are used in making handles of cooking utensils, plates, cups, floor tiles, electrical fittings, telephone instruments, etc.
Posted by Manoj Shrivas 6 years, 5 months ago
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Meghna Thapar 5 years, 10 months ago
Types of plastics: Plastics are of two types – thermoplastics and thermosetting plastics.
- Thermoplastics – Thermoplastics get soft when heated and hard again when they are cooled. Example – polythene and poly vinyl chloride. Such plastics are used in making toys, containers, plastic bags, raincoats and combs. Thermoplastics are used in making those articles which do not get too hot, and are flexible.
- Thermosetting plastics – Thermosetting plastics get soft only one, the first time they are heated after being made. When such plastics are heated for the first time, they become soft and can be moulded to make an article of any desired shape. On cooling, the article becomes hard and rigid. Example – Bakelite and melamine. They are used in making handles of cooking utensils, plates, cups, floor tiles, electrical fittings, telephone instruments, etc.
Posted by Manoj Shrivas 6 years, 5 months ago
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Zafar Hussain 6 years, 5 months ago
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