Tag: towards green energy

Answer is D.

A non-renewable resource (also called a finite resource) is a resource that does not renew itself at a sufficient rate for sustainable economic extraction in meaningful human time-frames. An example is carbon-based, organically-derived fuel. The original organic material, with the aid of heat and pressure, becomes a fuel such as oil or gas. Earth minerals and metal ores, fossil fuels (such as coal, petroleum, and natural gas), nuclear fuels, and groundwater in certain aquifers are all non-renewable resources.
Natural resources such as coal, petroleum (crude oil) and natural gas take thousands of years to form naturally and cannot be replaced as fast as they are being consumed. Eventually it is considered that fossil-based resources will become too costly to harvest and humanity will need to shift its reliance to other sources of energy. 
Hence, fossil fuels are non-renewable resources.

Answer is A.

Carbon monoxide, nitrogen oxides, and hydrocarbons are released when fuel is burned in an internal combustion engine and when air/fuel residuals are emitted through the vehicle tailpipe. Gasoline vapors also escape into the atmosphere during refueling and when fuel vaporizes from engines and fuel systems caused by vehicle operation or hot weather.
The pollutants in vehicle emissions are known to damage lung tissue, and can lead to and aggravate respiratory diseases, such as asthma. Motor vehicle pollution also contributes to the formation of acid rain and adds to the greenhouse gases that cause climate change.
Pollutants emitted directly from vehicles are not the only cause for concern. On warm, sunny days, hydrocarbons react with oxides of nitrogen to create a secondary pollutant, ozone. In many urban areas, motor vehicles are the single largest contributor to ground-level ozone which is a common component of smog. Ozone causes coughing, wheezing and shortness of breath, and can bring on permanent lung damage, making it a cause of crucial public health problems.
Hence, CNG gas is used to control the air pollution. ompressed natural gas, or CNG, is natural gas under pressure which remains clear, odorless, and non-corrosive. Although vehicles can use natural gas as either a liquid or a gas, most vehicles use the gaseous form compressed to high pressures.

Hydrogen has the highest calorific value of 150 kJ/g. Among the hydrocarbon, methane has the highest calorific value of 55 kJ/g.

Other than dry cells, i.e., the battery cells, all the three devices have been invented to make use of solar energy.

Coal, petroleum and natural gas are conventional source of energy. Nuclear power is a non-conventional source of energy.

Geothermal energy is described from heated ground water.

Wood and animal dung are major source of energy for cooking in rural areas. It is readily available and is cheap form of energy, while solar energy is not abundantly used because its difficult to harness solar energy and coal is not cost efficient.

Geothermal energy is heat from within the Earth. The core and lower part of mantle generates large amount of heat. Deep, super heated water present, can be pumped to surface and used to produce electricity.