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Meghna Thapar 5 years, 5 months ago
In terms of evolution, organisms belonging to the same species have more in common than organisms belonging to different species of the same genus or different genus. We have more in common with a Chinese school-boy because both belong to the same species of Homo sapiens, and thus, share a common ancestor.
Posted by Mahi..... ♾ 5 years, 6 months ago
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Lucifer?? Morningstar?? 5 years, 6 months ago
Posted by Mahi..... ♾ 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
Some concave mirror uses are listed in the points below.
- Shaving mirrors
- Head mirrors
- Ophthalmoscope
- Astronomical telescopes
- Headlights
- Solar furnaces
Some convex mirror uses are listed in the points below.
- Inside buildings
- Vehicle mirrors
- Magnifying glass
- Security purposes
Posted by Mahi..... ♾ 5 years, 6 months ago
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Samirul Fauziya 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
During a single cycle blood goes twice in the heart which is known as double circulation. It is necessary in human being to separate oxygenated and de-oxygenated blood because this makes their circulatory system is more efficient and helps in maintaining constant body temperature.
Lucifer?? Morningstar?? 5 years, 6 months ago
Posted by Lucifer ? Morningstar? 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
Soviet cosmonaut Valentina Tereshkova became the first woman to fly to space when she launched on the Vostok 6 mission June 16, 1963.
Posted by Lucifer ? Morningstar? 5 years, 6 months ago
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Gaurav Seth 5 years, 6 months ago
Roald Amundsen
The first person to reach the South Pole was Norwegian explorer Roald Amundsen
Posted by Lucifer ? Morningstar? 5 years, 6 months ago
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Gaurav Seth 5 years, 6 months ago
Physical Properties of Carbon:
Carbon is a unique element. It occurs in many forms. Some of the examples of the pure form of carbon are coal and soot. It is soft and dull grey or black in color. One of the most important compounds of carbon is the charcoal, which is formed when carbon is heated in the absence in of air. It occurs in a number of allotropic forms. Allotropes are nothing but forms of an element with varying physical as well as chemical properties. The density of the different forms of carbon depends upon the origin of these elements. You will find some forms of carbon which are pure and some forms which are not pure like coal which is the mixture of both carbon and hydrogen.
Posted by Lucifer ? Morningstar? 5 years, 6 months ago
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Gaurav Seth 5 years, 6 months ago
| Diamond | Graphite |
| It has crystalline nature | It has layered structure |
| Each C is sp3 hybridzed and forms 4 covalent bonds with neighboring C atoms. | Each C atom is sp2 hybridized and forms 3 sigma bonds with 3 other C atoms. Fourth electron forms pi bond. |
| The geometry is tetrahedral. | The geometry is planar |
| C-C bond length is 154 pm | C-C bond length is 141.5 pm |
| It has rigid covalent boning which is difficult to break. | It is soft. Its layers can be separated easily. |
| It is an electrical insulator. | It is good conductor of electricity. |
Posted by Ankita Singh 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
- We might be using computers in our day to day lives but never wondered the presence of a magnet inside it. Magnetic elements present on a hard disk helps to represent computer data which is later ‘read’ by the computer to extract information.
- Magnets are used inside TVs, Sound speakers and radios. The small coil of wire and a magnet inside a speaker transforms the electronic signal to sound vibrations.
- Magnets are used inside a generator to transform mechanical energy to electrical energy where there are other kinds of motors which use magnets to change electrical energy to mechanical energy.
- Electrically charged magnets can help cranes to move large metal pieces.
- Magnets are used in filtering machines which separates metallic ores from crushed rocks.
- It is also used in food processing industries for separating small metallic pieces from grains etc.
- Magnets are used in MRI machines which are used to create an image of the bone structure, organs, and tissues. Even magnets are used to cure cancer.
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