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The plastics which has changes in its properties on application of heat and cooling are called thermoplastics. They gets softened on heating and becomes hard on cooling. These are soluble in specific solvents.Gets swell under specific conditions. They have good to resist the creep.
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Increasing soil fertility
Some bacteria and blue green algae are able to fix nitrogen gas from the atmosphere to enrich the soil with nitrogen compounds and increase its fertility
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A force is push or a pull which when applied ,would lead to change in the shape or size of the object .
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Biogas is produced from plant material and animal waste from households and some types of industrial wastes, such as fish processing, dairies and sewage treatment plants. It is a mixture of gases which include methane, carbon dioxide, hydrogen sulphide and water vapour. In this mixture, methane burns easily.
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Yogita Ingle 7 years, 6 months ago
Harmful effects of microorganisms:
- Bacteria: Causes various diseases such as typhoid, diarrhea, and cholera.
- Fungi: Causes a large number of diseases in plants and in animals such as rust diseases in plants, fruit rot in apple, red rot in sugar cane and ring worm disease in human beings.
- Algae: Algal boom in water (rapid growth of algae) causes poisonous effect after they die, which in turn results in the death of aquatic organisms.
- Protozoa: Causes Amoebic dysentery, pyorrhoea and sleeping sickness etc.
- Virus: Cause small fox, common cold, influenza, herpes, hepatitis, polio and rabies.
Posted by Akhil Tomar 7 years, 6 months ago
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Yogita Ingle 7 years, 6 months ago
Metals are malleable, i.e. they can be beaten into thin sheets. Metals are good conductors of heat and electricity. Metals are ductile, i.e. they can be drawn into thin wires. Metals are sonorous, i.e. they produce a typical metallic sound when hit with something. Metals have metallic shine; called lustre. For example : Iron, copper and silver.
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A wave is the disturbance produce in the medium from an equilibrium condition which travels with the finite velocity in the region of space. Wave motion transfers energy from one point to another, which may or may not displace particles of the medium.
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Yogita Ingle 7 years, 6 months ago
Macro means very small.
Microorganism: An organism which cannot be seen by naked eyes is called microorganism or microbe. We need a microscope to see a microbe.
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Yogita Ingle 7 years, 6 months ago
The types of motion are: (i) Uniform motion (ii) Non uniform motion
(i) Uniform motion: When equal distance is covered in equal interval of time, the motion is said to be in uniform motion.
(ii) Non Uniform motion: When unequal distances are covered in equal interval of time, the motion is said to be in non uniform motion.
We can even classify motion into three types: (i) Translatory motion (ii) Rotatory motion (iii) Vibratory motion
Translatory Motion :In Translatory motion, the particle moves from one point in space to another. This motion may be along a straight line or along a curved path.
They can be classified as:
(a) Rectilinear Motion: Motion along a straight line is called rectilinear motion.
(b) Curvilinear Motion: Motion along a curved path is called curvilinear motion.
(ii) Rotatory Motion: In Rotatory motion, the particles of the body describe concentric circles about the axis of motion.
(iii) Vibratory Motion: In Vibratory motion, the particles move to and fro about a fixed point.
Posted by Tamish Sejwal 7 years, 6 months ago
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Yogita Ingle 7 years, 6 months ago
Fossil Fuels: During the carboniferous age, the earth had large amounts of plant life and dense forests in swampy and low-lying wetland areas. Plants and other life forms, after their death, drifted down to the bottom of the swamps, where they were compressed and decomposed to form peat. Coal and petroleum were formed from dead remains of plants and animals which got buried millions of years ago. Due to this, coal and petroleum are called fossil fuels. Coal is also a fossil fuel.
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