SUMMARY: The chapter "Sources of Energy" in Class 10 Science discusses various forms of energy, their sources, and the criteria for a good source of energy. KEY TOPICS: renewable energy, non-renewable energy, fossil fuels, solar energy, wind energy, hydroelectric power, biomass, geothermal energy, nuclear energy, energy efficiency
Which of the following energy sources has the highest energy efficiency?
ASolar panels
BWind turbines
CNuclear power plants
DFossil fuel power plants
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Correct answer: Option 3 — Nuclear power plants
Q111 Mark
Which of the following is NOT a characteristic of a good source of energy?
AEasily accessible
BEnvironmentally friendly
CHigh cost of production
DRenewable
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Correct answer: Option 3 — High cost of production
Q121 Mark
What is the role of photovoltaic cells in solar energy?
AThey store energy
BThey convert solar energy into electricity
CThey generate heat
DThey produce wind energy
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Correct answer: Option 2 — They convert solar energy into electricity
Q131 Mark
Which energy source is most commonly used for electricity generation worldwide?
ABiomass
BNatural gas
CCoal
DWind energy
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Correct answer: Option 3 — Coal
Q141 Mark
Which of the following is a method to improve energy efficiency?
AUsing incandescent bulbs
BImplementing energy audits
CIncreasing fossil fuel consumption
DReducing renewable energy use
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Correct answer: Option 2 — Implementing energy audits
Q151 Mark
What is the main environmental concern associated with hydroelectric power?
AAir pollution
BDisplacement of communities
CGreenhouse gas emissions
DHigh operational costs
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Correct answer: Option 2 — Displacement of communities
Short Answer Questions10 questions
Q163 Marks
What are renewable energy sources? Provide two examples.
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Renewable energy sources are those that can be replenished naturally over a short period of time. Examples include solar energy and wind energy.
Q173 Marks
Explain the term 'non-renewable energy'.
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Non-renewable energy refers to energy sources that cannot be replenished in a short time frame and are finite. Fossil fuels like coal, oil, and natural gas are prime examples.
Q183 Marks
What is solar energy and how is it harnessed?
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Solar energy is the energy obtained from the sun's rays. It is harnessed using solar panels that convert sunlight into electricity or heat.
Q193 Marks
Describe the process of generating hydroelectric power.
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Hydroelectric power is generated by using the flow of water to turn turbines, which then convert kinetic energy into electrical energy. This is typically done in dams where water is stored and released to create energy.
Q203 Marks
What are fossil fuels and why are they considered non-renewable?
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Fossil fuels are natural substances formed from the remains of ancient plants and animals, such as coal, oil, and natural gas. They are considered non-renewable because they take millions of years to form and are being consumed faster than they can be replenished.
Q213 Marks
List two advantages of using wind energy.
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Two advantages of wind energy are that it is a clean source of energy, producing no emissions, and it is renewable, as wind is a naturally occurring phenomenon that can be harnessed repeatedly.
Q223 Marks
What is biomass energy and how is it produced?
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Biomass energy is produced from organic materials, such as plant and animal waste. It is generated through processes like combustion, anaerobic digestion, or fermentation to release energy.
Q233 Marks
Explain geothermal energy and its applications.
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Geothermal energy is the heat that comes from the Earth's interior. It can be used for electricity generation, direct heating, and in geothermal heat pumps for residential heating and cooling.
Q243 Marks
What is energy efficiency and why is it important?
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Energy efficiency refers to using less energy to provide the same service or output. It is important because it helps reduce energy consumption, lowers costs, and minimizes environmental impact.
Q253 Marks
Discuss the role of nuclear energy as a source of power.
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Nuclear energy is generated through nuclear fission, where atomic nuclei are split to release a large amount of energy. It is a powerful energy source that produces minimal greenhouse gas emissions but raises concerns about radioactive waste.
Long Answer Questions6 questions
Q266 Marks
Explain the difference between renewable and non-renewable sources of energy. Provide examples of each and discuss their advantages and disadvantages.
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Renewable sources of energy are those that can be replenished naturally over time, such as solar energy, wind energy, hydroelectric power, biomass, and geothermal energy. These sources are sustainable and have a lower environmental impact compared to non-renewable sources. Non-renewable sources, on the other hand, include fossil fuels like coal, oil, and natural gas, as well as nuclear energy. These sources are finite and can lead to environmental degradation and pollution. The advantages of renewable energy include sustainability and lower emissions, while the disadvantages may include higher initial costs and dependence on weather conditions. Non-renewable energy sources are often more reliable and cheaper in the short term but pose long-term environmental risks.
Q276 Marks
Discuss the process of harnessing solar energy and its applications in daily life. What are the challenges associated with solar energy?
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Solar energy is harnessed using solar panels that convert sunlight into electricity through photovoltaic cells. This energy can be used for various applications, including residential electricity, heating water, and powering devices. Solar energy is particularly beneficial in reducing electricity bills and minimizing carbon footprints. However, challenges include the high initial cost of solar panels, the need for large areas for installation, and the intermittent nature of sunlight, which can limit energy production during cloudy days or at night. Additionally, energy storage solutions are required to ensure a consistent power supply.
Q286 Marks
Describe the working principle of wind energy and its significance as a renewable energy source. What are the limitations of wind energy?
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Wind energy is generated by converting the kinetic energy of wind into mechanical energy using wind turbines. The turbines rotate when wind blows, which drives a generator to produce electricity. Wind energy is significant as it is abundant, renewable, and produces no greenhouse gas emissions during operation. However, limitations include the variability of wind speed, which can affect energy production, the need for large land areas for wind farms, and potential impacts on wildlife and local ecosystems. Additionally, the aesthetic impact on landscapes can be a concern for some communities.
Q296 Marks
Explain how hydroelectric power is generated and discuss its advantages and disadvantages as a source of energy.
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Hydroelectric power is generated by harnessing the energy of flowing water, typically from rivers or dams. Water flows through turbines, which spin and drive generators to produce electricity. The advantages of hydroelectric power include its ability to produce large amounts of electricity with low emissions, reliability, and the capability for energy storage through pumped storage systems. However, disadvantages include the ecological impact on aquatic ecosystems, displacement of communities due to dam construction, and dependence on water availability, which can be affected by droughts or climate change.
Q306 Marks
What is biomass energy, and how is it produced? Discuss its role in sustainable energy solutions.
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Biomass energy is produced from organic materials such as plant and animal waste. It can be converted into biofuels, biogas, or directly burned for heat and electricity. The process involves the combustion of biomass or the anaerobic digestion of organic matter to produce methane. Biomass energy plays a significant role in sustainable energy solutions as it utilizes waste materials, reduces reliance on fossil fuels, and can contribute to carbon neutrality if managed sustainably. However, challenges include competition with food production, land use changes, and emissions from combustion.
Q316 Marks
Discuss the role of geothermal energy in energy production. What are its advantages and potential drawbacks?
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Geothermal energy is derived from the heat stored beneath the Earth's surface. It can be harnessed for electricity generation or direct heating applications. The advantages of geothermal energy include its reliability, low emissions, and minimal land footprint compared to other energy sources. It provides a consistent energy supply, as it is not dependent on weather conditions. However, potential drawbacks include geographical limitations, as it is most effective in regions with volcanic activity, and the risk of induced seismicity associated with geothermal plants. Additionally, the initial costs for drilling and plant construction can be high.
Assertion–Reason Questions8 questions
Q321 Mark
Assertion (A): Solar energy is a renewable source of energy.
Reason (R): Renewable sources of energy can be replenished naturally in a short period.
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Correct answer: Option 1 —
Both A and R are true, and R is the correct explanation of A.
Q331 Mark
Assertion (A): Fossil fuels are considered non-renewable energy sources.
Reason (R): Fossil fuels take millions of years to form and cannot be replenished quickly.
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Correct answer: Option 1 —
Both A and R are true, and R is the correct explanation of A.
Q341 Mark
Assertion (A): Wind energy can be harnessed using wind turbines.
Reason (R): Wind turbines convert kinetic energy from wind into electrical energy.
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Correct answer: Option 1 —
Both A and R are true, and R is the correct explanation of A.
Q351 Mark
Assertion (A): Biomass is a non-renewable source of energy.
Reason (R): Biomass can be replenished through the growth of plants and organic materials.
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Correct answer: Option 3 —
A is true, but R is false.
Q361 Mark
Assertion (A): Hydroelectric power is generated from the energy of flowing water.
Reason (R): Hydroelectric power plants convert the potential energy of water into electrical energy.
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Correct answer: Option 1 —
Both A and R are true, and R is the correct explanation of A.
Q371 Mark
Assertion (A): Geothermal energy is derived from the heat stored beneath the Earth's surface.
Reason (R): Geothermal energy is a renewable source that can be used for heating and electricity generation.
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Correct answer: Option 1 —
Both A and R are true, and R is the correct explanation of A.
Q381 Mark
Assertion (A): Nuclear energy is considered a renewable source of energy.
Reason (R): Nuclear energy relies on uranium, which is a finite resource.
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Correct answer: Option 3 —
A is true, but R is false.
Q391 Mark
Assertion (A): Energy efficiency refers to using less energy to provide the same service.
Reason (R): Improving energy efficiency reduces energy consumption and environmental impact.
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Correct answer: Option 1 —
Both A and R are true, and R is the correct explanation of A.
Statement-Based Questions8 questions
Q401 Mark
Statement 1: Fossil fuels are considered renewable sources of energy.
Statement 2: Solar energy is a non-renewable source of energy.
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Correct answer: Option 4 —
Both statements are false.
Q411 Mark
Statement 1: Hydroelectric power is generated using water flow.
Statement 2: Biomass energy comes from organic materials.
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Correct answer: Option 1 —
Both statements are true.
Q421 Mark
Statement 1: Nuclear energy is derived from the splitting of atomic nuclei.
Statement 2: Wind energy is harnessed using solar panels.
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Correct answer: Option 3 —
Only Statement 2 is true.
Q431 Mark
Statement 1: Geothermal energy is sourced from the Earth's internal heat.
Statement 2: Energy efficiency refers to using less energy to provide the same service.
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Correct answer: Option 1 —
Both statements are true.
Q441 Mark
Statement 1: Renewable energy sources are unlimited and can be replenished naturally.
Statement 2: Fossil fuels are the most environmentally friendly energy sources.
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Correct answer: Option 4 —
Both statements are false.
Q451 Mark
Statement 1: Solar energy can be converted into electrical energy using solar panels.
Statement 2: Wind energy is not a viable source of energy in coastal areas.
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Correct answer: Option 3 —
Only Statement 2 is true.
Q461 Mark
Statement 1: Biomass energy can contribute to reducing waste.
Statement 2: Hydroelectric power plants do not have any environmental impact.
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Correct answer: Option 4 —
Both statements are false.
Q471 Mark
Statement 1: Energy efficiency helps in reducing energy consumption.
Statement 2: Nuclear energy is a renewable source of energy.
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Correct answer: Option 2 —
Only Statement 1 is true.
