SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They haven’t developed the technology to use anything else.
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Mining for coal does not harm any habitats or ecosystems.
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Coal is a non-polluting source of energy.
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Coal is a renewable energy source.
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Detailed explanation-1: -Because of its abundance, reliability and affordability, about 23.4% of the nation’s electricity is generated from coal, resulting in electricity costs that generally are 30% lower in states that rely upon coal for more than half of their electricity generation versus states that rely on other fuels.
Detailed explanation-2: -However, coal is experiencing fierce competition from low-priced natural gas and ever-cheaper renewable power. Over the last decade, the United States has seen a 40 percent decline in coal-fired generation, owing to lower coal plant utilization rates and plant retirements.
Detailed explanation-3: -Coal became the largest source of energy in the 1880s, when it overtook wood, and remained the largest source until the early 1950s, when coal was exceeded by petroleum. Coal provided more than half of the nation’s energy from the 1880s to the 1940s, and from 1906 to 1920 provided more than three-quarters of US energy.