Magdhan

    In the sixth country B.C. North India was divided into sixteen kingdoms out of which Avanti, Vatsa, Kosala and Magadha rose into prominence by aggrandizing upon other weaker states.These four states involved themselves in internecine quarrel in which Magadha emerged as the most powerful state and acquired mastery in the political domain of … Read more

Emergence of Socialism-

Emergence of socialism in the 1920s in the nationalist ranks JL Nehru and SC Bose Raised the question of internal class oppression by capitalists and landlords MN  Roy became the first Indian to be elected to the leadership of the Communist International Muzaffer Ahmed and SA Dange were tried in the Kanpur Conspiracy Case 1925: … Read more

Noise Pollution

  Sound is measured in decibels (dB). An increase of about 10 dB is approximately double the increase in loudness. A person’s hearing can be damaged if exposed to noise levels over 75 dB over a prolonged period of time. The World Health Organization recommends that the sound level indoors should be less than 30 … Read more

 Global warming

  An increase in the average temperature of Earth’s near surface air and oceans since the mid-20th century 4th assessment report of IPCC: global temperature increased 74+0.18 degree C during the 20th century. Caused by greenhouse gases Water vapour, Co2, Methane, Nitrous Oxide, Ozone, CFCs (in order of abundance) Since the industrial revolution, the burning of fossil fuels has increased … Read more

The Working Class Movements

There were some working class movements in second half of 19th century. However, they were impulsive and not very well organized. The early nationalists had a lukewarm attitude towards the question of workers. This war because initially Congress wanted to focus on issues which were of common concern to all the people of India. There … Read more

Origin of the Aryans

    The Aryans came to India in several waves. The earliest wave is represented by the Rig Vedic people who appeared in the subcontinent in about 1500 BC. They came into conflict with the indigenous inhabitants called the Dravidians mentioned as Dasa or Dasyus in Rig Veda. The Rig Veda mentions the defeat of … Read more

Characteristics of Under Development

The term underdevelopment refers to that state of an economy where levels of living of masses are extremely low due to very low levels of per capita income resulting from low levels of productivity and high growth rates of population. Underdeveloped countries are now known as ‘developing countries’ signifying that such nations are capable of … Read more

 Climatic changes

    It is the long term change in the statistical distribution of weather patterns over periods of time Though it has been happening naturally for millions of years, in recent years it has accelerated due to anthropogenic causes and has been causing global warming. UNFCCC defines climate change as – “a change of climate … Read more

Aquatic Zones

  Aquatic systems are not called biomes, The major differences between the various aquatic zones are due to salinity, levels  of dissolved nutrients; water temperature, depth of sunlight penetration.   Fresh Water Ecosystem-Fresh water ecosystem are classified as lotic (moving water) or lentic (still or stagnant water).   Marine Ecosystem- Estuaries-Coastal bays, river mouths and … Read more

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