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Yogita Ingle 6 years, 10 months ago
Lightning is observed as a bright streak of light during a thunderstorm. Lightning is always accompanied by the sound of thunder. The transfer of charge from clouds to the earth or from cloud to cloud is called lightning. In simple words; lightning is an electric spark which happens on a grand scale in the sky.
Mechanism of Lightning
- During a thunderstorm, the air currents move upward and water droplets move downward. These movements take at very fast pace and it results in separation of charges in the clouds.
- The positive charges accumulate at the upper edges of the clouds and the negative charges accumulate at the lower edges of the clouds. Scientists are yet to understand the exact reason for this.
- At the same time, the ground becomes positively charged.
Saloni Pant 6 years, 10 months ago
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Meghna Thapar 5 years, 11 months ago
A planet is a celestial body that is in orbit around the Sun and has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape. However, asteroids are small bodies smaller than planets and mostly irregular shape orbiting Sun.
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Meghna Thapar 5 years, 11 months ago
Earth’s has a mean radius of 6,371 km (3,958.8 mi), and a mass of 5.97 × 1024 kg, whereas Jupiter has a mean radius of 69,911 ± 6 km (43441 mi) and a mass of 1.8986×1027 kg. In short, Jupiter is almost 11 times the size of Earth, and just under 318 times as massive.
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On September 28, 1928, Scottish scientist Alexander Fleming discovered penicillin, now one of the world's leading antibiotic medications. Penicillin is an antibiotic; it kills disease-causing bacteria. The invention of penicillin was a milestone in the practice of medicine. It changed the way doctors treated diseases.
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Yogita Ingle 6 years, 10 months ago
The main reasons of revolt among Indian rulers during the revolt of 1857 are:
1. Indian soldiers were ill treated and also their wages were less than the British soldiers and the rank of Indian soldiers were lower than the Britishers.
2. There was a major cut in their salaries due to the withdrawal of their foreign service allowance.
3. They were not allowed to use their religious symbols.
4. The rules laid in 1856 made the soldiers mandatory to serve overseas.
5. The Soldiers were forced to travel overseas through sea route and if someone insisted for a land route, they were punished.
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Yogita Ingle 6 years, 10 months ago
Nana Sahib, Rao Sahib (nephew of Nana), Tantia Tope, Azimullah Khan (advisor of Nana Sahib) led the revolt of 1857 at Kanpur.
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D.J Alok 6 years, 10 months ago
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