Last seen: Sep 30, 2021
Yes, sun is the ultimate source of energy. Directly or indirectly, all the forms of energy are derived from solar energy. Fossil fuels like coal, petr...
Environmental consequences of using fossil fuels are: (i) They are the largest emitters of greenhouse gases such as carbon dioxide and methane. ...
Ocean thermal energy and tidal energy can be harnessed from ocean.
There is a need to harness non-conventional sources of energy because: (i) fossil fuels are limited sources and are depleting fast. (ii) burning...
Conversion of hydro energy into electrical energy High rise dams are constructed on the river to obstruct the flow of water to collect it at a sui...
(a) To avoid loss of heat from solar cooker to the surroundings. (b) Black surface absorbs more heat radiations of incident energy. (c) Transparen...
The waste obtained from nuclear power plants is highly radioactive in nature which emits harmful radiations, whereas waste produced in a thermal power...
Methane, carbon dioxide, hydrogen and hydrogen sulphide. Advantages of using biogas over fossil fuels are: Biogas burns without smoke, leaves no...
When wood is burnt in a limited supply of oxygen, volatile materials present in it get removed and cooled to get wood tar and wood gas. The black re...
Limitations in harnessing wind energy are: Speed of wind is not available at all time and at all places. To establish the wind energy farm, a lar...
(a) A vast variety of plants get submerged in water, rot under anaerobic conditions and produce large amount of greenhouse gases such as methane. (...
(a) The heat energy obtained from the molten rocks formed in the deeper hot regions inside the earth are called geothermal energy. (b) Advantages of...
(a) Charcoal is considered to be a better fuel than wood because: It burns without flames. It is comparatively smokeless. It has higher calorifi...
Hazards of nuclear wastes are: (i) Nuclear waste contains radioactive substances which emit harmful nuclear radiations. (ii) There is a high risk ...
The solar cooker which was covered with a plane glass slab would be more efficient. The glass lid allows the heat radiation from sun to enter the sola...
A large number of solar cells combined in an arrangement to obtain large electrical power is called solar cell panel. Applications of solar cell pan...
Advantages of nuclear energy are: (i) A small quantity of nuclear fuel is needed to produce a large amount of useful energy. (ii) Nuclear power ...
(i) It is the source of excellent manure, rich in nitrogen and phosphorous which can be obtained from the biogas plant in addition to biogas. (ii) ...
Practical uses of biogas in rural area are: (i) It is an excellent fuel which burns without smoke with high heating capacity. (ii) It is also used...
Starting material for biogas is mainly cow dung. So, it is also known as gobar gas.