Which of the following types of coal has the most carbon content?
- A.Bituminous
- B.Lignite
- C.Peat
- D.Anthracite
Correct answer
Explanation
The correct answer is D, anthracite. Anthracite is the oldest and hardest grade of coal, with the highest proportion of carbon, so it gives the most heat for its weight and burns with a clean, almost smokeless flame. Option A is wrong because bituminous coal, though the grade most widely used in industry and in power stations, stands below anthracite in carbon content and produces more smoke. Option B is wrong because lignite, also called brown coal, is a low grade with high moisture, used mainly in power stations built at the mine itself. Option C is wrong because peat is the first stage of the process, little more than partly decayed plant matter, with the least carbon and the most moisture of the four. The rising order to remember is peat, lignite, bituminous, anthracite.
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Practice Questions
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- A.Comparable
- B.Much higher
- C.Higher
- D.Lower
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A geothermal plant takes steam or hot water from a natural underground reservoir, whose temperature is set by the rock and rarely approaches what a furnace can produce, so both the temperature and the pressure at the turbine are well below those of a coal-fired steam plant, and the thermal…
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- B.Gurugram, Haryana
- C.Bengaluru, Karnataka
- D.Paris, France
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- A.2006
- B.2008
- C.2010
- D.2015
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The mission was launched in January 2010 as one of the eight national missions under the National Action Plan on Climate Change, and its aim was to make solar power competitive by building capacity in stages and by supporting domestic manufacturing.
Read the full explanation →Which of the following is NOT a renewable source of energy?
- A.Tidal energy
- B.Natural gas
- C.Biomass
- D.Geothermal energy
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Natural gas is a fossil fuel formed over millions of years from buried organic matter; the stock is fixed, so every unit burnt is gone, and it releases carbon dioxide when burnt, although less than coal for the same heat.
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- A.Gujarat
- B.Rajasthan
- C.Tamil Nadu
- D.Maharashtra
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