Category: Physics
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Why is that, whatever they contain, dustbins always smell the same?
The source of the smell is most probably caused by bacteria and fungi feeding on organic matter in the rubbish. It will be more noticeable if the bin is in a warm and damp place.
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What is the difference between radial and ordinary tyres?
Answer 1. Ordinary tyres or cross-ply tyres are the oldest type of tyre and has a case made of two or more layers of fabric. A tyre’s strength and load carrying ability were at one time indicated by its number of plies. Modern materials and man made fibers such as polyester and glass fiber embedded…
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Why are a circle divided into 360 degrees?
The Babylonians 3000 years ago used the hexadecimal system of numbering, which was based upon a multiplication of 6, instead of the decimal system which we now used. They divided the circle for example into 60×6 parts- the 360 degrees. Each degree in turn was divided into 60 parts was again divided into 60.
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Where does sand come from? Has any thought been given to manufacturing it?
Particles of sand, sometimes sorted by water transport into deposits of remarkably uniform size, are continuously being formed, often from the bedrock of earth, by weathering and erosion by chemical and physical forces.
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What are Euro norms?
The Euro norms are meant for regulating vehicular emission in Europe. The norms are expressed in terms of the weight of pollutants such as carbon monoxide (CO), hydrocarbon (HC), oxides of nitrogen (NOx) and particulate matter emitted per kilometer of vehicular run with load. These ceilings have been fixed for various categories of vehicles. For…
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How do CFCs damage the ozone layer?
Most of us don’t think about how our everyday activities might influence the global environment. An example is our use of chlorofluorocarbons or CFCs. These compounds which are useful as propellants in aerosol sprays, refrigerants, and coolants, cleaning agents, insult ants and plastic foam are the main Easters of ozone present in the ozonosphere. Ozonosphere…
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What are cosmic rays?
ANSWER 1 Cosmic rays are electromagnetic waves of extremely short wavelength. As the word suggests their origin is from outer space or the cosmos. These rays consist of positively charged particles coming from various galaxies outside the solar system and comprise mainly of protons, alpha particles and positive ions of some heavy elements. The sun…
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What is solar wind?
ANSWER 1 Solar wind is a combination of electrically charged stream of atomic particles – electrons, protons, with small proportions of heavier nuclei and the entrained solar magnetic field emitted from the sun’s atmosphere. E. N. Parker in 1958 showed that due to the very high temperatures of the corona the pressure exerted results in…
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Where does dust come from and why does it reappear so soon after we dust?
Terrestrial dust is mostly tiny fragments abraded from things; some of it may be even smaller things aggregating together to form motes of dust. The larger things that turn to dust can be almost anything in the world, from shoes to ships to sealing wax, not to mention cabbages (fragments of dried vegetable matter) and…