MAIN NOTES

Electromagnetic Wave

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Electromagnetic Wave Electromagnetic Wave are waves composed of undulating electrical fields and magnetic fields. The different kinds of electromagnetic waves, such as light and radio waves, form the electromagnetic spectrum. All electromagnetic waves have the same speed in a vacuum, a speed expressed by the letter c (the speed of light) and equal to about … Read more Electromagnetic Wave

Communication systems

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Communication System  The word communication has been derived from Latin ward ―communis‖ which means common. Thus communication means sharing of ideas is common. It can be defined as exchange of facts, ideas, opinions or emotions between two or more persons to create a common ground of understanding.  Communication is the process of passing … Read more Communication systems

Basics of Computer

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  Definition of digital computer, Elements of computer: Input unit, Output unit, Primary memory, Secondary memory and Processing unit.     Computer is an electronic device that is designed to work with Information. term computer is derived from the Latin term‘computare’, this means to calculateor programmable machine. Computer cannot do anything without a Program. It represents the decimal numbers through a string … Read more Basics of Computer

e-governance and e- commerce,

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E- Governance E-government refers to the delivery of national or local government information and services via the Internet or other digital means to citizens or businesses or other governmental agencies. E-government is a one-stop Internet gateway to major government services. E-government facilitates provision of relevant government information in electronic form to the citizens in a … Read more e-governance and e- commerce,

Types of missiles with reference to the India Missile Programme

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India’s Missile program   Introduction India’s missile programme took a shot from space programme, beginning 1967. In 1972, Rohini- a 560 two-stage, solid propulsion sounding rocket was developed and test fired India first launched its small 17-tonne SLV-3 space booster in 1979 India successfully injected the 35 kg Rohini I satellite into near-earth orbit in … Read more Types of missiles with reference to the India Missile Programme

Various chemical and biological weapons

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Various chemical and biological weapons chemical weapons A chemical weapon is any toxic chemical that can cause death, injury, incapacitation, and sensory irritation, deployed via a delivery system, such as an artillery shell, rocket, or ballistic missile. Chemical weapons are considered weapons of mass destruction and their use in armed conflict is a violation of … Read more Various chemical and biological weapons

Role of drdo in various fields (other than weapons)

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Role of drdo in various fields (other than weapons) The Defence Research and Development Organisation (DRDO) is an agency of the Republic of India, charged with the military’s research and development, headquartered in New Delhi, India. It was formed in 1958 by the merger of the Technical Development Establishment and the Directorate of Technical Development … Read more Role of drdo in various fields (other than weapons)

States of Matter

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States of Matter Solids are formed when the attractive forces between individual molecules are greater than the energy causing them to move apart. Individual molecules are locked in position near each other, and cannot move past one another. The atoms or molecules of solids remain in motion. However, that motion is limited to vibrational energy; … Read more States of Matter

Allotropes of carbon

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Allotropes of carbon Allotropy is the property of some chemical elements to exist in two or more different forms, or allotropes, when found in nature. There are several allotropes of carbon. Diamond Diamond is probably the most well known carbon allotrope. The carbon atoms are arranged in a lattice, which is a variation of the … Read more Allotropes of carbon