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Ask QuestionPosted by Santan Kumar Singh 6 years, 1 month ago
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Meghna Thapar 6 years, 1 month ago
Working of Human blood circulatory system takes place in the steps below:
(i) When the muscles of all the four chambers are relaxed, the pulmonary vein brings the oxygenated blood from the lungs in the left atrium of the heart.
(ii) When the left atrium contracts, the oxygenated blood is pushed into the left ventricle through valve V1.
(iii) When the left ventricle contracts, the oxygenated blood enters the main artery called aorta from which it goes to the different body organs through small branches called arterioles and capillaries.
(iv) The main artery carries the blood to all the organs of the body head, arms etc except the lungs. The oxygenated blood gives off oxygen, digested food and dissolved materials to the body cells. The carbon dioxide produced in the cells enters the blood. The deoxygenated blood enters main vein called vena cava which carried it to the right atrium of the heart.
(v) When the right atrium contracts, the deoxygenated blood enters right ventricle through valve V2.
(vi) When the right ventricle contracts, the deoxygenated blood enters the lungs through pulmonary artery and releases carbon dioxide and absorbs fresh oxygen from air. The blood becomes oxygenated again and is sent to the left atrium of heart by pulmonary vein for circulation in the body. This whole process is repeated continuously.
Posted by Mangat Rai Mangat Rai 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
Chinese school boy is a member of same species that we are of i.e., Homo sapiens. It is the environment that has caused some morphological variations.
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Posted by Akash Rai 6 years, 1 month ago
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Meghna Thapar 6 years, 1 month ago
Lenz’s law states that induced electromotive force with different polarities induces a current whose magnetic field opposes the change in magnetic flux through the loop in order to ensure that original flux is maintained through the loop when current flows in it.
Posted by Ankit Kumar Malhyan 6 years, 1 month ago
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Shivam Sanket 6 years, 1 month ago
Posted by Akash Rai 6 years, 1 month ago
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Meghna Thapar 6 years, 1 month ago
Transformer is a static device which convert electrical power from one circuit to another without changing its frequency.
Working principle: It works on the principle of mutual induction of two coils or Faraday Law’s Of Electromagnetic induction. When current in the primary coil is changed the flux linked to the secondary coil also changes. Hence an EMF is induced in the secondary coil due to Faraday law’s of electromagnetic induction.
Posted by Akash Rai 6 years, 1 month ago
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Meghna Thapar 6 years, 1 month ago
A transformer is a static device which transfers electrical energy from one circuit to another through the process of electromagnetic induction.
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Posted by Insha Naaz 6 years, 1 month ago
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Meghna Thapar 6 years, 1 month ago
Physical Properties of Metals:
- Physical State: All metals are solids at room temperature.
Exceptions: Mercury and gallium are liquids at room temperature.
- Lustre: All metals in their pure state have a shine and can be polished to give a highly reflective surface.
- Malleability: Metals have the ability to withstand high tensile strength and can be made into thin sheets. This property of metals is called malleability.
- Ductility: Metals can also be drawn into thin wires. The ability of metals to be drawn into wires is called ductility. Example: Gold and silver are the most ductile metals.
- Conduction of Heat: Metals are good conductors of heat and have high melting points. Example: Silver and copper are very good conductors of electricity.
Exceptions: Lead and mercury are poor conductors of heat.
- Conduction of Electricity: Metals are good conductors of electricity.
Example: All electric wires are made of copper.
- Hardness: Metals are generally hard, and their hardness varies from metal to metal. Alkali metals such as sodium and potassium are soft metals and can be easily cut with a knife.
- Melting and Boiling Points: Metals usually have high melting and boiling points. Tungsten has the highest melting point whereas sodium and potassium have low melting points.
- Sonorous: Metals which produce a sound on striking a hard surface are said to be sonorous.
Physical Properties of Non-Metals:
- Non-metals are either in the solid or gaseous state.
Exception: Bromine is an exception which exists in the liquid state.
- Non-metals do not have lustre.
Exception: Iodine crystals are lustrous.
- They do not possess the property of hardness.
Exception: Carbon in the form of diamond is the hardest substance, which has a high melting and boiling point.
- Non-metals are poor conductors of heat and electricity.
Exception: Graphite, an allotrope of carbon which conducts electricity.
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Yogita Ingle 6 years, 1 month ago
When white light falls on sea, longest wavelength light (i.e., red, orange and yellow) are absorbed by water and remaining short wavelength light blue gets reflected. That's why sea and as well sky looks blue in colour .
Posted by Nitin Tiwari 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
The sky appears dark from the surface of the moon because there are no atmospheric particles to scatter sunlight. At high altitudes, scattering of sunlight is not prominent.
Posted by Harsh Aryan 6 years, 1 month ago
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Posted by Nitin Tiwari 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
The earth’s atmosphere is a heterogeneous mixture of minute particles. These particles include smoke, tiny water droplets, suspended particles of dust and molecules of air. When a beam of light strikes such fine particles, the path of the beam becomes visible. The light reaches us, after being reflected diffusely by these particles. The phenomenon of scattering of light by the colloidal particles is called Tyndall effect.
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Meghna Thapar 6 years, 1 month ago
Watershed management implies an effective conservation of soil and water resources for sustainable production with minimum non point resources (NFS) pollutant losses. It involves management of land surface and vegetation so as to conserve the soil and water for immediate and long term benefits to the farmers, community and society as a whole.
The various measures adopted under soil and water harvesting is:
(a) Vegetative barriers
(b) Building of contour bunds along contours for erosion
(c) Furrow/Ridges and Furrow ridge method of cultivation across the slope.
(d) Irrigation water management through drip and sprinkler methods.
(e) Planting of horticultural contour species on bunds.
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Sparsh Tyagi 6 years, 1 month ago
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