Podcast
Questions and Answers
Which of the following is classified as a primary source of energy?
Which of the following is classified as a primary source of energy?
- Solar energy (correct)
- Kerosene
- Diesel
- Natural gas
What distinguishes non-renewable energy sources from renewable sources?
What distinguishes non-renewable energy sources from renewable sources?
- Non-renewable sources include solar energy.
- Non-renewable sources are always more efficient.
- Non-renewable sources cannot be quickly replaced when used up. (correct)
- Non-renewable sources can be replenished quickly.
Which of the following is an example of a secondary source of energy?
Which of the following is an example of a secondary source of energy?
- Biomass
- Natural gas
- Coal
- Biogas (correct)
What are fossil fuels primarily used for?
What are fossil fuels primarily used for?
Which of the following forms of energy is not mentioned as part of the different forms of energy?
Which of the following forms of energy is not mentioned as part of the different forms of energy?
What is the SI unit for the heating value of fuel?
What is the SI unit for the heating value of fuel?
Which of the following materials would NOT be considered a fuel?
Which of the following materials would NOT be considered a fuel?
Which of the following is NOT a characteristic of renewable energy sources?
Which of the following is NOT a characteristic of renewable energy sources?
Flashcards
What is energy?
What is energy?
Energy that exists in various forms like light, heat, electrical, chemical, nuclear, kinetic, and potential energy.
What is fuel?
What is fuel?
Substances that react to release heat or energy through chemical or nuclear processes.
What are primary energy sources?
What are primary energy sources?
Energy sources used in their natural form, like wood, coal, oil, natural gas, dung, and solar energy.
What are secondary energy sources?
What are secondary energy sources?
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What are non-renewable energy sources?
What are non-renewable energy sources?
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What are renewable energy sources?
What are renewable energy sources?
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What is solar energy production?
What is solar energy production?
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How are fossil fuels formed?
How are fossil fuels formed?
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Study Notes
Competencies for Chapter 9: Energy
- Students will be able to describe the process of producing solar energy
- Students will understand the technology of solar energy and construct simple apparatus
- Students will be able to introduce fossil fuels and describe their uses
- Students will understand the technology of making briquette and bio-gas
- Students will identify alternative energy sources in Nepal and assess their feasibility
Types of Energy
- Energy exists in various forms: heat, light, electrical, chemical, nuclear, kinetic, potential
- Energy is used to perform tasks and operate machines (e.g., cars, buses, trains, airplanes)
- The substance that reacts to produce heat is called fuel
- The SI unit for fuel heating value is J kg⁻¹
- Examples of fuels include: coal, petroleum, solar fuel, nuclear fuel, biomass
Sources of Energy
- Primary Sources: Sources found naturally and used in their original form. Examples include: wood, coal, crude oil, natural gas, dung, solar energy
- Secondary Sources: Sources derived from primary sources. Examples include: coal gas, bio-gas, kerosene, petrol, diesel, charcoal
- Energy sources can be classified as renewable or non-renewable
Non-Renewable Sources
- Accumulate in nature over long periods and cannot be replaced quickly when depleted
- Examples: coal, natural gas, mineral oil, nuclear energy
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