With reference to ‘fuel cell’, consider the following statements:

1. A fuel cell converts hydrogen and oxygen into electricity, water and heat.
2. It produces electricity through a chemical reaction but without combustion.

Which of the statement(s) given above is/are correct?

With reference to second-generation 'biofuels’, consider the following statements:

1. Second-generation biofuels could significantly expand the volume and variety of sources that could be used for biofuel production.
2. Second-generation biofuels cannot be used in an internal combustion engine.

Which of the statement(s) given above is/are correct?

Which of the following is/are the disadvantages of alternate fuels?

1. Alternate fuels are highly viscous and thus need high injection pressure.
2. Excessive use of alternate fuels lead to carbon deposits in the engine.

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In what sense are the Run-of-the-River (ROR) projects considered better than the traditional hydropower projects?

1. These projects involve minimal environmental damage, because large- scale storage of water is not required.
2. Run-of-the-River (ROR) projects do not obstruct the flow of the river and thus can be constructed on international rivers.

Which of the statement(s) given above is/are correct?

Consider the following statements:

$1$. Ethanol can be produced from both edible and non-edible seeds including the jatropha plant.
$2$. Biodiesel is extracted from molasses, a byproduct of the sugar industry.

Which of the statement(s) given above is/are correct?

Below mentioned are two statements about the advantages of biogas:

1. Waste left in the biogas plant acts as a good fertilizer because of the significant presence of Nitrogen and Phosphorous.
2. Biogas can be used for a variety of purposes such as the generation of electricity, lighting and cooking food.

Which of the statement(s) given above is/are correct?

Which of the following states has the maximum potential for wind energy?

Consider the following statements:
1. Geothermal energy refers to the heat energy available on the surface of the earth in the form of hot geysers or steam, from the inside of the earth's crust.
2. The use of geothermal energy causes significant environmental damage, especially to the underground water resources.
Which of the statements given above is/are correct?

Which of the following are the advantages of a coal-based thermal power plant?

1. The initial cost of setting a coal-based power plant is far low as compared to other power plants.
2. It can be installed at any place irrespective of the existence of coal. The coal can be easily transported to the site.
3. The pollution generated by it has a temporary impact. The pollution settles at the surface in the form of ash.
4. It is cheaper to operate a coal-based power plant as compared to hydroelectric plants.

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