The main parts of the human eye are: Cornea, Iris, Pupil, Ciliary muscles, Eye lens, Ratena and Optic nerve. The eye -ball is approximately spherical in shape having a diameter of about 2.5 cm. We will now describe the construction and working of the eye. Construction of the Eye The fro…

The materials which are burnt to. Produce heat energy are known as fuels. Examples of fuels are: wood, Coal, Cooking gas (LPG), Kerosene, Diesel and Petrol. In our day life, the most important source of energy are fuels. Fuels are, in fact, the concentrated store- house of energy. This …

A biogas plant consists of a well shaped, underground tank T called digester, which is made of bricks, and has a dome- shaped roof D, also made of cement and bricks. The disgester is a kind of sealed tank in which there is no air (or oxygen).  The dome of the digester tank acts as a gas…

The dead parts of plants and trees, and the waste materials of animals are called biomass. Biomass is called organic matter which is used as a fuel to produce energy. Biomass includes wood, agricultural wastes (crop residues) and cow-dung. Biomass contains chemical energy in the form of…

The energy from the sea can be obtained mainly in three forms: Tidal energy Wave energy, and Ocean thermal energy We will describe these means of obtained energy from the sea in somewhat detail. Tidal Energy The rise of sea water due to gravitational pull of the moon is called"high…