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1 PHYSICS MCQS

The term ‘white coal’ is sometimes referred to which of the following?

  • Geothermal energy
  • Wind energy
  • Hydroelectricity
  • Biomass energy
Correct Answer: C. Hydroelectricity

Detailed Explanation

The term “white coal” is often used as a metaphor to describe hydroelectricity. Just as traditional coal has been a major source of energy for centuries, hydroelectric power has emerged as a modern, renewable alternative, hence earning the nickname "white coal."Hydroelectricity is generated by converting the kinetic energy of flowing or falling water into electricity. This is usually done by building dams on rivers, where the stored water flows through turbines, rotating them and producing electrical power. Unlike fossil fuels, which emit carbon dioxide and contribute to global warming, hydroelectricity is a clean and renewable energy source.


The phrase "white coal" emphasizes two main points:




  1. Clean Energy – Unlike black coal, which pollutes the environment, hydroelectric power is free from harmful emissions.




  2. Powerful and Valuable – Just as coal was once the backbone of industrial energy needs, hydroelectricity now holds similar importance in renewable energy production.




Among the given options:




  • Geothermal energy is obtained from Earth’s internal heat.




  • Wind energy is generated by wind turbines.




  • Biomass energy comes from organic matter like wood, crop waste, or animal dung.
    While all these are renewable, none are referred to as "white coal."




Hydroelectricity, however, fits the description perfectly. Countries like Norway, Brazil, China, and Canada rely heavily on hydroelectric power for their electricity supply. In regions like South Asia, large dams such as Tarbela and Mangla in Pakistan are key contributors to power generation and irrigation.


In conclusion, “white coal” refers to hydroelectricity, symbolizing its significance as a clean, renewable, and sustainable energy source. This concept reflects the transition from fossil fuels to greener alternatives in the modern energy landscape.

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