Energy — Flashcards
ICSE · Class 10 · Environmental Science
48 flashcards for Energy (ICSE Class 10 Environmental Science) to test yourself on key terms and facts. Sample: "What are fossil fuels, and how are they"
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What are fossil fuels, and how are they formed?
Answer
Fossil fuels are coal, petroleum, and natural gas. They were formed by the decomposition and alteration of plant and animal remains over millions of years in the absence of oxygen.
Why are fossil fuels called non-renewable sources of energy?
Answer
They are called non-renewable because they exist in limited supply on human time scales and cannot be replaced quickly after use.
How did coal, petroleum, and natural gas form from ancient living matter?
Answer
Large plants gradually became coal, while small plants and animals became petroleum and natural gas after being buried under mud and sand, away from oxygen, where pressure, heat, and bacteria changed …
Which fossil fuel is the most widely used?
Answer
Oil, also called petroleum, is the most widely used fossil fuel.
Why was coal important in the Industrial Revolution?
Answer
Coal was historically the first fossil fuel used in the Industrial Revolution of the 1800s, so it played a major role in powering early industry and transport.
What is the main use of coal in energy production?
Answer
Coal is mainly used as a solid fuel to produce electricity and heat through combustion.
What is the main component of natural gas?
Answer
Natural gas is composed primarily of methane, about 85 to 90 percent.
Why is natural gas used as a cleaner fuel than petrol or diesel?
Answer
Natural gas burns more cleanly and, when used as CNG, it is lead-free and sulphur-free, so it reduces harmful engine emissions.
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