Tag: towards green energy

Questions Related to towards green energy

Which of the following is not a source of bio-fuel?

  1. bio-ethanol

  2. bio-diesel

  3. bio-petrol

  4. animal fats/oils


Correct Option: C

Biomass based energy can be obtained from :

  1. direct burning of wood, agricultural residue etc.

  2. biomass may be converted in to some other form of fuel which can release energy.

  3. bacterial decomposition of organic matters like cow dung, agricultural wastes, human excreta etc. in presence of water in absence of air, a mixture of $CH _4, CO _2, H _2, H _2S $ etc.

  4. burning of industrial waste.


Correct Option: A,B,C
Explanation:

A biofuel is a fuel that is produced through contemporary biological processes, such as agriculture and anaerobic digestion, rather than a fuel produced by geological processes such as those involved in the formation of fossil fuels, such as coal and petroleum, from prehistoric biological matter. Biofuels can be derived directly from plants, or indirectly from agricultural, commercial, domestic, and/or industrial wastes. Renewable biofuels generally involve contemporary carbon fixation, such as those that occur in plants or microalgae through the process of photosynthesis. Other renewable biofuels are made through the use or conversion of biomass (referring to recently living organisms, most often referring to plants or plant-derived materials). This biomass can be converted to convenient energy-containing substances in three different ways: thermal conversion, chemical conversion, and biochemical conversion. This biomass conversion can result in fuel in solid, liquid, or gas form. This new biomass can also be used directly for biofuels.

Energy can be extracted by creating a reservoir or basin behind a barrage and then passing tidal waters through turbines in the barrage to generate electricity. This form of energy is known as

  1. solar energy

  2. wind energy

  3. hydro energy

  4. tidal energy


Correct Option: D
Explanation:

Tidal power, also called tidal energy, is a form of hydropower that converts the energy obtained from tides into useful forms of power, mainly electricity.

The average annual wind density is $3\ kW/m^2/day$ along the coastal lines of Gujarat, western ghat and central parts of India which may show a seasonal variation (i.e., in winter it may go up to $10\ kW/m^2/day$ ). This can be harnessed as

  1. non-conventional energy

  2. coastal energy

  3. wind energy

  4. None of these


Correct Option: A,C

The heat energy obtainable from hot rocks present inside the earth crust is termed as

  1. Nuclear energy

  2. Tidal energy

  3. Geothermal energy

  4. None of these


Correct Option: C
Explanation:

Geothermal energy is thermal energy generated and stored in the Earth. Thermal energy is the energy that determines the temperature of matter. The geothermal energy of the Earth's crust originates from the original formation of the planet and from radioactive decay of materials

Non-conventional forms of energy can be

  1. created.

  2. transduced from other forms of energy.

  3. exhausted in our lifetime.

  4. None of these


Correct Option: B

Which fuel has the highest energy content per unit of mass of any chemical fuel?

  1. Petrol

  2. Hydrogen

  3. Uranium

  4. Coal


Correct Option: B
Explanation:

Hydrogen fuel is a zero-emission fuel when burned with oxygen (if one considers water not as an emission) or used in a contained cell (allowing to react galvanically) also capable of 'reversing' the reaction if needed. It often uses electrochemical cells, or combustion in internal engines, to power vehicles and electric devices. It is also used in the propulsion of spacecraft and might potentially be mass-produced and commercialized for passenger vehicles and aircraft.

Non-conventional sources of energy are 

  1. pollution-free

  2. renewable

  3. inexhaustible

  4. exhaustible


Correct Option: A,B,C
Explanation:

 Natural resources like wind, tides, solar, biomass, etc generate energy which is known as "Non-conventional resources“. These are pollution free ,renewable,inexhaustible  and hence we can use these to produce a clean form of energy without any wastage.

The source of energy which is different from others is

  1. Lignite

  2. Natural gas

  3. Sun

  4. Coal


Correct Option: C

The generation of electricity from water energy

  1. Will never get exhausted

  2. Will not produce any environmental pollution

  3. Is renewable source of energy

  4. All the above are correct


Correct Option: D