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General Knowledge for Competitive Exams

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Weather Disturbances

Nov 29, 2014
Weather is the state of the atmosphere, to the degree that it is hot or cold, wet or dry, calm or stormy, clear or cloudy.

Precipitation

Nov 29, 2014
Precipitation occurs when a portion of the atmosphere becomes saturated with water vapour, so that the water condenses and "precipitates".

Earth’s heat budget and its radiation balance

Nov 29, 2014
Earth's heat-budget or Earth's radiation balance refers to the net flow of energy into Earth in the form of shortwave radiation and the outgoing infrared long-wave radiation into space.

Atmospheric Circulation

Sep 15, 2012
Atmospheric circulation is a movement of air at a larger scale by which the earth's surface is covered and distributed over by thermal energy

Refractive Index: Lenses

Sep 14, 2012
  Thinner, lighter high-index lenses are especially recommended if you have a strong eyeglass prescription for nearsightedness, farsightedness or astigmatism.  

Dielectric Constant and Momentum

Sep 14, 2012
The dielectric constant is the relative permittivity of a dielectric material. It is an important parameter in characterizing capacitors. Momentum is a corner stone concept in Physics. It is a conserved quantity.  

Single and Multiple Scattering

Sep 14, 2012
Single and multiple scattering contributions to the circumsolar radiation along the almucantar and sun vertical have been computed by a Gauss-Seidel solution to the radiative transfer equation.

Compton Scattering

Sep 14, 2012
Compton observed the scattering of x-rays from electrons in a carbon target and found scattered x-rays with a longer wavelength than those incident upon the target.  

Scattering Theory

Sep 14, 2012
In mathematics and physics, scattering theory is a framework for studying and understanding the scattering of waves and particles.

Refraction and Reflectivity

Sep 14, 2012
The refractive index is retrieved from direct phase and amplitude measurements for transmission and reflection, which are all in excellent agreement with simulations. The reflection angle is equal to the incidence angle, and the amount of light that is reflected is determined by the reflectivity of the surface.

Rutherford Scattering

Sep 14, 2012
Rutherford Scattering is a phenomenon explained by Ernest Rutherford in 1911

Electromagnetic Scattering

Sep 14, 2012
Electromagnetic scattering is the physical effect of an electromagnetic wave, such as light or radio waves, hitting an object

Refractive Index: Phase Speed

Sep 13, 2012
The refractive index can be defined as the ratio of the speed of light in vacuum and the phase speed of light in a material.

Wind

Dec 10, 2010
Due to horizontal differences in air pressure, airflows from areas of high pressure to areas of low pressure. Horizontal movement of the air is called wind.

Clouds

Dec 10, 2010
Cloud is a mass of minute droplets of water or tiny crystals of ice formed by the condensation of water vapour in free air at  considerable elevations.

Major Climatic Regions of the world

Dec 10, 2010
Climate is the average weather condition and variations in both space and time over a large area. Humid Tropical Climates The Tropical Rain Forest/Equatorial Climate : This climate is found in a belt 0° to 25°N and S. The annual average temperature is 27°C and rainfall is heavy.

Atmosphere

Dec 10, 2010
The vast expanse of air which envelops the earth all around is called the atmosphere. It extends to thousands of kms. It protects the earth’s surface from the sun’s harmful, ultraviolet rays. It also regulates temperature, preventing the earth from becoming too hot or too cold. The major constituents of air in the atmosphere are Nitrogen (78%), Oxygen (21%), Argon (0.93%) and Carbon dioxide (0.03%). Besides water vapour, dust particles, smoke, salts and other impurities are present in air in varying quantities. On the basis of temperature, the atmosphere is divided into five layers:

Zones

Dec 10, 2010
The globe is divided into three temperature zones. 1. Tropical Zone : It extends between Tropic of Cancer and Capricorn. High temperature prevails throughout the year.

Pressure

Dec 10, 2010
The pressure exerted by the atmosphere as a result of its weight, above a unit area of the earth’s surface is called atmospheric pressure. It is expressed in millibars (mb) and measured.

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