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Ask QuestionPosted by Vijay Kumar 5 years, 9 months ago
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Meghna Thapar 5 years, 7 months ago
Friction depends on the smoothness or roughness of the two surfaces which are in contact with each other. When the two surfaces are smooth, then the friction between them are small. As the degree of roughness of the two surfaces in contact increases, the friction also increases.
Posted by Su Uraj 5 years, 9 months ago
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Meghna Thapar 5 years, 7 months ago
Francium is a radioactive alkali metal with the atomic symbol Fr, and atomic number 87. The mass numbers of known isotopes are 204-213, 217-224. Its valence is +1.
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Yogita Ingle 5 years, 9 months ago
One of the simplest way is to put them water and see the seeds that float on water and eliminate them as these seeds have holes between them and are not healthy.
Hand picking is the process in which the components of the mixture are separated by hand. Here one of the components should be present in small quantity. And the other component should be differ in shape, size , colour.
Posted by Charu Mathi 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
PET is a abbreviation of the synthetic polymer called Poly Ethylene Terephthalate. PET can be made into a fibre or plastic.
Posted by Bala Kunju 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
When we see a fan rotating around its axis, by standing just below it, we can observe that center point of a fan, about which it is rotating, is not changing its position.
Similarly, the pole star is situated in the direction of the earth’s axis and that is why it does not appear to move even though all stars appear that they are moving because of the rotation of the earth.
Posted by Eknath Patil 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
The growth hormone is produced by the anterior pituitary. It is made up of 191 amino acids that make a long single-chain polypeptide. It is synthesized in somatotropic cells found in the anterior pituitary gland. These cells also store and release the hormone.
The growth hormone is responsible for the regulation of several physiological processes such as growth and metabolism. It is also used as a drug in animals and plants.
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Yogita Ingle 5 years, 9 months ago
Nitrogen cycle is all about the movement of nitrogen between various elements on Earth (like air, soil, living organisms etc.) The amount of nitrogen in the atmosphere remains constant.
- Atmosphere has approx. 78% nitrogen.
- Atmospheric Nitrogen is fixed into the soil
- N2 fixing microbes convert atm. N2 into nitrogen compounds like NH3
- Plants utilize nitrogen from soil through their roots
- Animals utilize nitrogen, feeding on plants
- When Plants & animals die, Nitrogenous wastes are returned to soil
- Decomposers convert some part to nitrogen compounds to be used by plants
- Denitrifying bacteria convert into atm. N2
Posted by Manasa Gade 5 years, 9 months ago
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Posted by Tanu Saini 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
|
Conductors |
Insulators |
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They allow electricity to pass through them. |
They do not allow electricity to pass through them. |
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They have electric charges free to move. |
They have electric charges which are not free to move. |
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When some charge is transferred to a conductor, it readily distributes over the entire surface. |
When some charge is transferred to an insulator, it remains at the same place over the surface. |
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Most metals are conductors. |
Most non-metals are insulators. |
Posted by Ujjwal Kumar 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
Non conductor or insulater are the materials or substances which resist or don’t allow the current to flow through them. They are mostly solid in nature and are finding use in a variety of systems. They do not allow the flow of heat as well. The property which makes insulators different from conductors is its resistivity.
Wood, cloth, glass, mica, and quartz are some good examples of insulators.
Posted by Kiran Kiran Kumar 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
CNG : Compressed natural gas
It consist mainly of methane (about 85%), ethane (about 10%) propane (about 3%) and butane when natural gas is compressed at high pressure then it is called CNG (compressed natural gas).
Posted by Shweta Rathod 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
Non contact force
1.Non contact force is a force which on an object without coming physically in contact with.
2.The most familiar example of a non contact force is weight.
3.All four interactions are non contact forces.
Contact force
1. A contact force is a force applied to a body by another body.
2. Examples of contact forces are - Biological force, muscular force
3. Thus a contact force is a force that requires contact to occur.
Posted by Sulthana Jakir 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
We should connect the iron spoon to the cathode and the copper item to the anode of a battery. Then we should dip them in CuSO4solution. When electric current is passed through the circuit, CuSO4 dissociates into Cu+ ion and SO4- ion. The Cu+ ions get deposited on the iron spoon and the copper particles from the anode replace the Cu+ ions in the solution.
Sulthana Jakir 5 years, 9 months ago
Posted by Karanjot Singh 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
Electrolytes
It is an ionic compound which in the fused state or in aqueous solution allows the passage of an electric current and is decomposed by it.
Examples of electrolytes
Acids – H2SO4, HNO3, HCl, H3PO4
Bases – NaOH, KOH, NH4OH, Ca (OH) 2
Salts – NaCl, CuSO4 , PbBr2
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Meghna Thapar 5 years, 7 months ago
A meteorite is a fragment of spatial matter that falls to the surface of a planet. Most meteorites that fall to Earth come from the Asteroid Belt.
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