General Knowledge: CHEMISTRY

Knowledge in Chemistry is essential for day to day living. Of course its essential to make scientific discoveries, and make things work. In competitive examinations Questions in General Knowledge are asked from Chemistry. Here are lessons useful for tests like UPSC Exam, SSC Exam, Bank PO Exam, Defence Exam, Teachers' Training Exam, Admission Test, Scholarship Tests etc.

Introduction to Chemistry

Atomic Structure

Periodic Classification of Elements

Chemical Bonding

Oxidation and Reduction

General Knowlegde: PHYSICS

Perhaps everyone know Einstein. Physics is the science that make you immortal. Personally I divide PHYSICS in two phases; Physics before Einstein and Physics after Einstein. General Knowledge of Physics is the study discipline everyone should know and understand. In competitive examinations like Bank PO, SSC, Railways, UPSC Exam, Scholarship Test, Admission Test etc  GK Questions are asked in PHYSICS. Here are general lessons in physics useful for writing selection test / admission test etc.

Units

List of Scientific Instruments and Uses

Inventions, Inventor, Country and Year

Important Physics Discoveries in Chronology Order

General Knowledge - Environmental Science

Environment Science in academics has emerged as a new discipline. Human race did massive damage to environment and now we need to take corrective measures to keep it healthy and habitable.  Everyone should know and learn about Environment. To measure your environmental awareness, in competitive examinations questions are asked. Here are lessons about Environmental Science useful for competitive examinations like UPSC Exam, Bank PO Exam, SSC Exam, Police Service Exam, Railway Recruitment Exam, Scholarship Test, and Admission Test Etc.

Environmental Science: An Overview 

Some Environmental Facts

Energy

Waste

Ozone Layer Depletion

Glossary – Environmental Science

Abundance – This refers to the number or amount of something found in the environment, generally in plenty.

Acid precipitation- This refers to the acidic rain, snow, or dry particles set down from the air owing to increased acids released by anthropogenic or natural resources.

Acids- This refers to the substances that liberate hydrogen ions (protons) in water.

Some Environmental Facts

The biggest energy source on the surface of the earth is	Solar radiation
The acid found in soil is	Humic acid
Burning of fossil fuels releases	Carbon-di-oxide
The place referred to as the Valley of Death is	Cubatao in Brazil

Energy

The energy is the ability to do work. In India 70% population resides in rural areas; thus supplying energy to villages is vital to maintain pace in development. 21% of villages and nearly 50% rural households are yet not electrified.

The per capita consumption of energy was 4816 KWH in 2010-11, according to Central Statistics Office.

Disaster

Disaster is a sudden, calamitous event bringing great damage, loss, and destruction and devastation to life and property. The damage caused by disasters is immeasurable and varies with the geographical location, climate and the type of the earth surface/degree of vulnerability. This influences the mental, socio-economic, political and cultural state of the affected area.

Waste

Waste, or rubbish, trash, junk, garbage, depending on the type of material or the regional terminology, is an unwanted or undesired material or substance. It may consist of the unwanted materials left over from a manufacturing process (industrial, commercial, mining or agricultural operations,) or from community and household activities. The material may be discarded or accumulated, stored, or treated (physically, chemically, or biologically), prior to being discarded or recycled. It is also used to describe something we use inefficiently or inappropriately.

Ozone Layer Depletion

Ozone is composed of three oxygen molecules and. is produced naturally by sunlight. At ground level ozone is a pollutant, but in the upper stratosphere (a segment of atmosphere extending approximately 9 miles to 30 miles above the earth's surface) it forms a layer that protects the earth from the sun's harmful ultraviolet radiation. Although ozone composes a small part of the atmosphere's total mass, it absorbs more than 99% of the sun's ultraviolet radiation.

Acid Rain

Acid rain is rain consisting of water droplets that are unusually acidic because of atmospheric pollution - most notably the excessive amounts of sulfur and nitrogen released by cars and industrial processes. Acid rain is also called acid deposition because this term includes other forms of acidic precipitation such as snow.