Amitabh Bachchan

Name: Amitabh Harivansh Srivastava Date of Birth: 11th October, 1942. Place of Birth: Allahabad, Uttar Pradesh (U.P.) Father: Sh. Harivansh Rai Bachchan (Well known poet) Mother: Teji Bachchan Wife: Jaya Bachchan nee Bhaduri Son: Abhishek Bachchan (married to Aishwarya Rai) Daughter: Shweta Nanda (married to Nikhil Nanda) Education: He is double M.A.(Master of arts). He completed his education from Sherwood college, Nainital and Kirori Mal […]

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Allotrope

The term allotrope was first suggested by Swedish chemist J. J. Berzelius (1779-1848). Allotropes are two or more forms of the same element in the same physical state (solid, liquid, or gas) that differ from each other in their physical and sometimes chemical properties. The most notable examples of allotropes are found in groups 14, […]

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Alkali Metals

The first column on the periodic table of the chemical elements is collectively called the alkali metals. These metals include lithium, sodium, potassium, rubidium, cesium, and francium. Because their outer electron structure is similar, they all have somewhat similar chemical and physical properties. Some of the properties of alkali metals are All the metals are […]

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Acid Rain

Increasing acidity in natural water and soil has become a global concern. Acidification and climate change are interrelated as the sources responsible for acidification and greenhouse gases are the same. Unpolluted rain water normally is always slightly acidic, because CO2 in atmosphere dissolves in it forming carbonic acid (H2CO3).The pH of unpolluted rain water is about […]

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Acceleration

The rate of change of velocity is known as acceleration. An object is said to be accelerating if its rate of change of velocity is increasing or decreasing over a period of time and/or if its direction of motion is changing. The term acceleration is a vector quantity. This means that acceleration contains both magnitude […]

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5-S

Five-S (5-S): These five words are developed by Japanese which helps in quality and productivity improvement. They have proved that the first step towards quality improvement is work space utilization. SEIRI (Proper Arrangement): It means unnecessary items should not be kept in a workplace because they occupy space and create confusion. SEITON (Orderliness): It means everything should […]

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Pollution

When there are some physical, chemical or biological changes occur in our physical environment it is known as pollution and the substances which brings these changes are known as pollutants. The sources for the pollution can be natural or man made. Following are the types of Environmental pollution. Air pollution Water pollution Soil pollution Noise […]

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The Solar System

The solar system consists of a sun and all the objects those are revolving around it. The objects revolving around it includes 8 planets (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune) along with their satellites (moons) that travel around planets.   Asteroids which are planet like objects. Chunks of iron and stone called meteoroids. […]

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Fuels

A fuel is a substance which gives heat energy on combustion. A fuel contains carbon and hydrogen as main combustible elements. Calorific value of fuel: The amount of heat liberated in Kilocalorie or Kilojoules by the complete combustion of 1 Kg of fuel. Fuels can be divided into three main categories Solid fuels Liquid fuels […]

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United Nations

It is an association of nations which have pledged themselves to maintain peace and they will co-operate in solving the social, economic and cultural problems of the world. It was founded in 1945. A charter is signed by 51 nations on 26th June 1945 at San Francisco conference. The charter came into force on 24th October 1945 […]

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