ROUTERA

Sources of Energy

Class 10th Science Chapter Assertion and Reason

Sources of Energy

  • Options:
    a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
    b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
    c) Assertion (A) is true, but Reason (R) is false.
    d) Assertion (A) is false, but Reason (R) is true.

Question 1

Assertion (A): Renewable sources of energy are considered more sustainable than non-renewable sources.
Reason (R): Renewable sources can be replenished naturally in a short time.

  • Answer: a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
  • Explanation: Renewable energy sources, such as solar, wind, and hydroelectric power, can regenerate naturally, making them sustainable. In contrast, non-renewable sources, like fossil fuels, are finite and deplete over time.

Question 2

Assertion (A): Solar energy can be harnessed using solar panels.
Reason (R): Solar panels convert sunlight directly into electricity through photovoltaic cells.

  • Answer: a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
  • Explanation: Solar panels utilize photovoltaic cells to convert sunlight into electrical energy, allowing for the direct use of solar energy in various applications.

Question 3

Assertion (A): Fossil fuels are non-renewable sources of energy.
Reason (R): Fossil fuels take millions of years to form and cannot be replenished quickly.

  • Answer: a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
  • Explanation: Fossil fuels, such as coal, oil, and natural gas, form over geological timescales and are being consumed at a much faster rate than they can be replenished, making them non-renewable.

Question 4

Assertion (A): Hydroelectric power is a significant source of energy in many countries.
Reason (R): Hydroelectric power plants convert the kinetic energy of flowing water into electrical energy.

  • Answer: a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
  • Explanation: Hydroelectric power utilizes the flow of water to turn turbines, which then generate electricity, making it a vital renewable energy source.

Question 5

Assertion (A): Biomass can be used as a source of energy.
Reason (R): Biomass is a renewable source that includes organic materials such as plant and animal waste.

  • Answer: a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
  • Explanation: Biomass consists of organic materials that can be converted into energy through various processes, making it a renewable energy source when managed sustainably.

Question 6

Assertion (A): Wind energy is harnessed using wind turbines.
Reason (R): Wind turbines convert kinetic energy from wind into mechanical energy, which can then be converted to electricity.

  • Answer: a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
  • Explanation: Wind turbines capture the kinetic energy of wind and convert it into mechanical energy, which is then transformed into electrical energy through generators.

Question 7

Assertion (A): The use of natural gas is considered cleaner compared to coal.
Reason (R): Natural gas produces fewer pollutants and greenhouse gases when burned.

  • Answer: a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
  • Explanation: When burned, natural gas emits significantly less carbon dioxide and other pollutants than coal, making it a cleaner alternative in energy production.

Question 8

Assertion (A): Nuclear energy is derived from the splitting of atomic nuclei.
Reason (R): This process is called nuclear fission and releases a large amount of energy.

  • Answer: a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
  • Explanation: Nuclear fission involves splitting the nucleus of an atom, releasing substantial energy, which can be harnessed for electricity generation in nuclear power plants.

Question 9

Assertion (A): Geothermal energy is harnessed from the Earth's interior.
Reason (R): This energy is derived from the heat stored beneath the Earth's surface.

  • Answer: a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
  • Explanation: Geothermal energy is generated by utilizing the natural heat from the Earth's core, making it a reliable renewable energy source.

Question 10

Assertion (A): The use of energy-efficient appliances can reduce energy consumption.
Reason (R): Energy-efficient appliances convert more energy into useful work and waste less energy.

  • Answer: a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
  • Explanation: Energy-efficient appliances are designed to maximize energy use, minimizing waste and ultimately leading to lower energy consumption and costs.

Question 11

Assertion (A): Hydrogen is considered a potential future energy source.
Reason (R): Hydrogen can be used in fuel cells to produce electricity with water as the only byproduct.

  • Answer: a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
  • Explanation: Hydrogen fuel cells generate electricity through chemical reactions, producing only water as a byproduct, making it a clean energy option for the future.

Question 12

Assertion (A): Tidal energy is generated from ocean tides.
Reason (R): Tidal energy can be harnessed using turbines placed in tidal streams.

  • Answer: a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
  • Explanation: Tidal energy is derived from the gravitational pull of the moon and sun, and turbines can capture the kinetic energy of moving water during high and low tides.

Question 13

Assertion (A): Non-renewable energy sources are limited in availability.
Reason (R): The extraction of non-renewable resources causes significant environmental damage.

  • Answer: a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
  • Explanation: Non-renewable sources, like fossil fuels, are finite, and their extraction processes often lead to environmental degradation, highlighting the need for alternative energy sources.

Question 14

Assertion (A): Energy conservation is as important as energy generation.
Reason (R): Energy conservation helps reduce the demand for energy resources and minimizes environmental impact.

  • Answer: a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
  • Explanation: By conserving energy, we decrease the demand on energy resources, which helps reduce emissions and the overall environmental footprint.

Question 15

Assertion (A): The Sun is the ultimate source of energy for most living organisms on Earth.
Reason (R): Solar energy is the primary energy source for photosynthesis in plants, which are at the base of the food chain.

  • Answer: a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
  • Explanation: The Sun provides energy that drives photosynthesis, allowing plants to convert solar energy into chemical energy, forming the foundation of the food chain.

Question 16

Assertion (A): Solar energy is more abundant than fossil fuels.
Reason (R): Solar energy is continuously available and can be harnessed in various locations.

  • Answer: a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
  • Explanation: Solar energy is readily available and can be harnessed almost anywhere, making it a more abundant source compared to finite fossil fuel reserves.

Question 17

Assertion (A): Energy from the ocean can be harnessed through wave energy converters.
Reason (R): Wave energy converters capture the energy from surface waves to generate electricity.

  • Answer: a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
  • Explanation: Wave energy converters utilize the energy produced by ocean waves to generate electricity, showcasing another form of renewable energy harnessed from water bodies.

Question 18

Assertion (A): The combustion of fossil fuels contributes to global warming.
Reason (R): Burning fossil fuels releases greenhouse gases like carbon dioxide into the atmosphere.

  • Answer: a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
  • Explanation: The combustion of fossil fuels increases greenhouse gas concentrations in the atmosphere, leading to enhanced global warming and climate change.

Question 19

Assertion (A): The efficiency of solar panels has improved over the years.
Reason (R): Advances in technology have led to the development of more effective photovoltaic materials.

  • Answer: a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
  • Explanation: Technological innovations in solar panel materials and design have resulted in higher efficiency rates, allowing for greater energy capture from sunlight.

Question 20

Assertion (A): Energy transition to renewable sources is essential for sustainable development.
Reason (R): Renewable energy sources have lower environmental impacts compared to fossil fuels.

  • Answer: a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
  • Explanation: Transitioning to renewable energy sources is crucial for reducing carbon emissions and mitigating environmental impacts, thus supporting sustainable development goals.