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Ask QuestionPosted by Pavan G 7 years ago
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Posted by Pavan G 7 years ago
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Gaurav Seth 7 years ago
When a sweater is taken off, the woollen sweater gets charged because of the friction between the sweater and the body. Hence, one can hear a crackling sound during the given process.
Posted by Javaid Bhat 7 years ago
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Gaurav Seth 7 years ago
Kinetic Energy:
The energy possessed by a body due to its motion is called its kinetic energy.
Formula for kinetic energy:
Kinetic Energy = (½) x mass x velocity x velocity, shortly represented as the following KE = (½) mv2
Examples:
- The energy possessed by a moving road roller
- The energy possessed by a fired bullet from a gun.
- The energy possessed by an arrow released from a bow.
Posted by Javaid Bhat 7 years ago
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Meghna Thapar 5 years, 6 months ago
Cognitive development means how children think, explore and figure things out. It is the development of knowledge, skills, problem solving and dispositions, which help children to think about and understand the world around them. Brain development is part of cognitive development. An example of cognitive development is the neurological development which occurs in the brain. Such development is characterized by the neuroplasticity of the brain, which involves brain repair following injury and the ability of the brain to adapt to new environmental and physiological conditions.
Posted by Rishi Kishore 7 years ago
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Gaurav Seth 7 years ago
The conversion of atmospheric nitrogen into nitrogenous compounds is nitrogen fixation.You have learnt about the bacterium Rhizobium. It is involved in the fixation of nitrogen in leguminous plants (pulses). Recall that Rhizobium lives in the root nodules of leguminous plants, such as beans and peas, with which it has a symbiotic relationship. Sometimes nitrogen gets fixed through the action of lightning. But you know that the amount of nitrogen in the atmosphere remains constant.
Rhizobium bacteria living in the root nodules of legume plants, fix nitrogen from the atmosphere.Microorganisms in the soil convert atmospheric nitrogen into ammonium compounds, thereby enabling the survival of plants and animals.Nitrogen is an essential constituent of proteins, nucleic acids, chlorophyll and vitamins.Blue green algae are able to fix nitrogen from the atmosphere.Nitrogen from the atmosphere is fixed by biological nitrogen fixers like blue green algae and some bacteria.Fungi are decomposers that degrade organic waste compounds into simple substances, ready for reuse by plants
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Yogita Ingle 7 years ago
- Agriculture employs 67% of the labour in the country.
- It provides raw materials to the agro-based industries or the industries which depend on agriculture such as paper industry, natural textile industry etc.
- The country receives an important fraction of foreign exchange from agricultural export.
- This sector greatly contributes to the GDP of the country.
Gaurav Seth 7 years ago
Agriculture is the backbone of the Indian economy because :
(i) In India, about 63% people were engaged in agriculture sector in 2001.
(ii) Share in GDP was more than 40% in 1973.
(iii) Raw materials for secondary sectors are mostly supplied by agriculture. But now, the share of agriculture is declining in the GDP year by year. So, it is a matter of serious concern for all.
(iv) Share of agriculture in the GDP has declined from 44% to 24% during 1973 to 2003.
(v) The primary sector continues to be the largest employer even in 2000 but the production has not increased by this rate.
Posted by Adarsh U D 7 years ago
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Yogita Ingle 7 years ago
1. India is basically an agriculture-based country with 80% of its population in rural areas, whereas in the US, only a small number of people are involved in farming.
2. The average farm holdings in the India are of small sizes (2-3 hectares), whereas in the US, the farm holdings are large (250 hectares).
3. Most of the Indian farmers are uneducated or receive basic education in the village schools, whereas in the US, the farmers are mostly well educated and keep themselves updated with the latest developments in the agriculture field.
4. Indian farming is labor intensive and traditional methods of farming like plowing is used, whereas, in the US, heavy and advanced machinery is used for farming which is capital intensive.
5. Indian farming is weather dependent and farmers grow only 2-3 crops per year. In the US, the farmers use scientific techniques like soil testing etc. and grow multiple crops throughout the year.
6. The US farmlands give bigger returns to the farmer when compared to the Indian farmlands.
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Gaurav Seth 7 years ago
Lightning can be explained in terms of charges produced due to rubbing. During a thunderstorm, the air currents move upwards and the water droplets move downwards. And this caused the separation of charge due to this vigorous motion.
As a result of this process, the positive charges collect near the upper edge and the negative charges accumulate near the lower edge of the cloud and also near the ground. As the charge gets accumulated, its magnitude becomes very large. Water droplets in the air act as a conductor of this charge.
These charges flow to meet, thus producing strikes of lightning and thunder. For this phenomenon to occur, a sufficiently high electric potential between two regions and a high resistance medium must be present.
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