14. Sources of energy SEBA/ASSEB Class 10 Science– Important Questions and Answers | Assam HSLC

SEBA/ASSEB Class 10 Science Chapter 14: Sources of energy Important Questions and Answers | HSLC Assam

Chapter 14: Sources of energy

Multiple choose Question and Answer :

Question: Which of the following is a renewable source of energy?

(a) Coal (b) Petroleum (c) Solar energy (d) Natural gas

Answer: (c) Solar energy

Question: Fuel used in thermal power plants is

(a) Fossil fuels (b) Uranium (c) Water (d) Biomass

Answer: (a) Fossil fuels .

Question: Which of the following is not an example of a biomass energy source?
(a) Wood (b) Gobar gas (c) Nuclear energy (d) Coal
Answer: (c) Nuclear energy

Question: A solar water heater cannot be used to get hot water on:
(a) A sunny day (b) A cloudy day (c) A hot day (d) A windy day
Answer: (b) A cloudy day

Question: Acid rain happens because
(a) Sun leads to heating of upper layer of atmosphere
(b) Burning of fossil fuels release oxides of carbon, nitrogen and sulphur in the atmosphere
(c) Earth atmosphere contains acids

(d) Electrical charges are produced due to friction amongst clouds
Answer: (b) Burning of fossil fuels release oxides of carbon, nitrogen and sulphur in the atmosphere.

Question: Which of the following is an exhaustible source of energy?

(a) Wind (b) Sunlight (c) Coal (d) Tidal energy

Answer: (c) Coal

Question: The main source of energy in a solar cooker is:

(a) Wind (b) Sunlight (c) Coal (d) Petroleum

Answer: (b) Sunlight.

Question: In a hydro power plant
(a) Potential energy possessed by stored water is converted into electricity
(b) Kinetic energy possessed by stored water is converted into potential energy
(c) Electricity is extracted from water
(d) Water is converted into steam to produce electricity
Answer: (a) Potential energy possessed by stored water is converted into electricity.

Question: The main component of biogas is:
(a) Methane (b) Carbon dioxide (c) Hydrogen (d) Hydrogen sulfide
Answer: (a) Methane

Question: The power generated by a windmill depends on:
(a) Tower height (b) Wind speed (c) Surrounding trees (d) None of the above
Answer: (b) Wind speed .

Question: Which one of the following forms of energy leads to least environmental pollution in the process of its harnessing and utilisation?

(a) Geothermal energy (b) Solar energy (c) Thermal energy (d) Nuclear energy

Answer: (b) Solar energy

Question: Fuel used in thermal power plants is:
(a) water (b) uranium (c) fossil fuels (d) biomass
Answer: (c) fossil fuels

Question: Non-conventional sources of energy are:
(a) exhaustible (b) inexhaustible (c) neither exhaustible nor inexhaustible (d) too expensive
Answer: (b) inexhaustible.

Question: Which gas is mainly responsible for the greenhouse effect among the following?

(a) Oxygen (b) Nitrogen (c) Carbon dioxide (d) Hydrogen

Answer: (c) Carbon dioxide .

Question: The major problem in harnessing nuclear energy is how to:
(a) split nuclei (b) sustain the reaction (c) dispose of spent fuel safely (d) convert nuclear energy into electrical energy
Answer: (c) dispose of spent fuel safely

Question: Which is the ultimate source of energy?
(a) Water (b) Sun (c) Uranium (d) Fossil fuels
Answer: (b) Sun .

Question: Which of the following is a conventional source of energy?

(a) Coal (b) Solar cell (c) Tidal energy (d) Wind energy

Answer: (a) Coal .

Question: Biogas mainly contains:

(a) Oxygen (b) Methane (c) Nitrogen (d) Hydrogen

Answer: (b) Methane .

Question: Ocean thermal energy is due to:
(a) energy stored by waves in the ocean (b) temperature difference at different levels in the ocean

(c) pressure difference at different levels in the ocean (d) tides arising out in the ocean
Answer: (b) temperature difference at different levels in the ocean .

Question: Which energy source uses the energy of moving air?

(a) Geothermal energy (b) Wind energy (c) Nuclear energy (d) Chemical energy

Answer: (b) Wind energy .

Question: The energy of ocean tides is mainly caused by:

(a) Earthquakes (b) The gravitational pull of the Moon and Sun (c) Volcanic eruptions (d) Ocean salinity

Answer: (b) The gravitational pull of the Moon and Sun .

Question: The power generated in a windmill:
(a) depends on the tower height (b) depends on wind velocity

Question: Which is a limitation of solar energy?

(a) It is always available at night (b) It produces electricity only from coal

Answer: (c) Its availability depends on sunlight

Question: The major constituent of biogas is
(d) Hydrogen sulphide (c) Hydrogen (b) Carbon dioxide (a) Methane
Answer: (a) Methane

Question: Which of the following is not a conventional source of energy ? [SEBA 2016]

(a) Fossil fuels (b) Bio-Mass (c) Nuclear energy (d) Wind energy

Answer: (c) Nuclear energy

[ Nuclear energy is not a conventional source of energy. ]

Question: Which of the following in not a renewable source of energy ? [SEBA 2017]

(a) Sun (b) wind (c) fossil fuel (d) water

Answer: (c) fossil fuel .

Question: Which of the following is not derived from energy of the sun ?[SEBA 2018]

(a) Biomass (b) Nuclear energy (c) Geothermal energy (d) Wind energy

Answer: (b) Nuclear energy

[ Nuclear energy is not derived from the energy of the sun. ]

Question: Which one of the following is an example of non-conventional source of energy ? [SEBA 2021]

(a) Fossil fuels (b) Thermal power plants (c) Hydropower plants (d) Solar energy

Answer: (d) Solar energy

[ Solar energy is an example of a non-conventional source of energy. ]Top of Form

Question: Which of the following is not derived from the Sun’s energy ? [2024]

(a) Wind energy (b) Geothermal energy (c) Nuclear energy (d) Biomass

Answer: (b) Geothermal energy.

[ Geothermal energy comes from inside the Earth, so it is not derived from the Sun’s energy.]

Question: Which of the following is not a renewable source of energy ? [2024]

(a) Sun (b) Wind (c) Fossil fuel (d) Water

Answer: (c) Fossil fuel .

[ Fossil fuels are non-renewable because they cannot be replaced quickly once used.]

Question: The source of the formation of coal and petroleum is [2024]

(a) coliform (b) biomass (c) greenhouse gas (d) ocean water

Answer: (b) biomass .

[ Coal and petroleum are fossil fuels formed from ancient biomass.]

Question: Which of the following is a conventional source of energy ? [SEBA 2023]

(a) Wind energy (b) Nuclear energy (c) Geo-thermal energy (d) Wave energy

Answer: (b) Nuclear energy

[ Nuclear energy is considered a conventional source of energy. ]

Question: Which of the following processes explains the extraction of the sun’s energy to generate energy to light a bulb ? [2025]

(a) Conversion of electric energy into solar energy. (b) Conversion of solar energy into electric energy.

Answer: (b) Conversion of solar energy into electric energy.

[ Solar energy → Electrical energy → Light energy.]

Question: Which of the following is not based on solar energy ? [2025]

(a) Wind energy (b) Nuclear energy (c) Geothermal energy (d) Biogas

Answer: (c) Geothermal energy

[ Geothermal energy comes from the Earth's internal heat, so it is not based on solar energy.]

Question: Which part of the solar cooker is responsible for green house effect?

(a) Coating with black colour inside the box (b) Mirror (c) Glass sheet (d) Outer cover of the solar cooker

Answer: (c) Glass sheet .

Question: Choose the correct statement

(a) Sun can be taken as an inexhaustible source of energy

(b) There is infinite storage of fossil fuel inside the earth

(d) Waste from a nuclear power plant can be easily disposed off

Answer: (a) Sun can be taken as an inexhaustible source of energy.

Question: Choose the incorrect statement regarding wind power

(a) It is expected to harness wind power to minimum in open space

(b) The potential energy content of wind blowing at high altitudes is the source of wind power

(d) One possible method of utilising the energy of rotational motion of the blades of a windmill is to run the turbine of an electric generator

Answer: (b) The potential energy content of wind blowing at high altitudes is the source of wind power

Question: Assertion and Reasoning :

Choose the correct option: (a) Both A and R are true and R is the correct explanation of A.

(b) Both A and R are true but R is not the correct explanation of A.

(d) A is false but R is true.

Question: Assertion (A): Solar energy is an example of a renewable source of energy.
Reason (R): Solar energy is renewable because the Sun will always produce power.
Answer: (a) Both A and R are true and R is the correct explanation of A.

Question: Assertion (A): Coal and petroleum resources are limited; we should use them judiciously.
Reason (R): Fossil fuels are inexhaustible resources.
Answer: (c) A is true but R is false.

Question: Assertion (A): CNG is used for power generation.
Reason (R): Natural gas is easy to transport through pipes.
Answer: (b) Both A and R are true but R is not the correct explanation of A.

Question: Assertion (A): Fuel has to be burnt to obtain heat energy.
Reason (R): The minimum temperature to which a fuel must be heated so that it may catch fire and start burning is known as ignition temperature.
Answer: (b) Both A and R are true but R is not the correct explanation of A.

Question: Assertion (A): The major constituent of biogas is methane.
Reason (R): Biogas is produced by the anaerobic degradation of animal wastes like cow-dung in the presence of water.
Answer: (a) Both A and R are true and R is the correct explanation of A.

Question: Assertion (A): In a wind energy farm, a number of windmills are erected over a large area.
Reason (R): The output of a single windmill is quite small and cannot be used for commercial purposes.
Answer: (a) Both A and R are true and R is the correct explanation of A.

Question: Assertion (A): Fossil fuels are non-renewable sources of energy.
Reason (R): There are only limited reserves of fossil fuels.
Answer: (a) Both A and R are true and R is the correct explanation of A.

Question: Assertion (A): Solar energy is a renewable source of energy.
Reason (R): The Sun will continue to radiate energy for about 5 billion years more.
Answer: (a) Both A and R are true and R is the correct explanation of A.

Question: Assertion (A): Nuclear energy is a non-renewable source of energy.
Reason (R): The nuclear fuels like uranium and thorium are present in limited quantity in nature.
Answer: (a) Both A and R are true and R is the correct explanation of A.

Question: Assertion: A solar cooker works efficiently at night.

Reason: A solar cooker requires sunlight to heat food.

Answer: (d) A is false but R is true.

Question: Assertion: Geothermal energy is derived from solar energy.

Reason: Geothermal energy comes from the heat inside the Earth.

Answer: (d) A is false but R is true.

Question: Assertion (A): Biogas is a better fuel than animal dung cakes.
Reason (R): Biogas burns without smoke and leaves no residue like ash.
Answer: (a) Both A and R are true and R is the correct explanation of A.

Question: Assertion (A): Hydroelectricity is a renewable source of energy.
Reason (R): Water gets refilled in the reservoir during rains.
Answer: (a) Both A and R are true and R is the correct explanation of A.

Question: Assertion: Hydroelectric energy is obtained from flowing or falling water.

Reason: Water stored at a height possesses gravitational potential energy.

Answer: (a) Both A and R are true and R is the correct explanation of A.

Question: Assertion (A): Burning of fossil fuels causes air pollution.
Reason (R): Burning of fossil fuels releases oxides of carbon, nitrogen and sulphur.
Answer: (a) Both A and R are true and R is the correct explanation of A.

Question: Assertion (A): Wind energy farms can be established only at those places where wind blows for most part of the year.
Reason (R): The minimum wind speed required for generating electricity from a windmill is 15 km/h.
Answer: (a) Both A and R are true and R is the correct explanation of A.

Very Short Question and Answer :

Question: What is a good source of energy?
Answer: A good source of energy should have the following characteristics:

(i) It should do a large amount of work per unit mass or volume.

(ii) It should be easily available.

(iii) It should be easy to store and transport.

(iv) It should be economical.

Question: What is a good fuel ?
Answer: A good fuel is one which is readily available, is cheap, burns easily in air at a moderate rate, produces a large amount of heat and does not leave behind much ash or harmful gases.

Question: Name two energy sources that you would consider to be renewable. Give reasons for your choice.
Answer: Solar energy and wind energy. The Sun will continue to radiate energy for about 5 billion years.

Wind is caused by uneven heating of the earth which will continue forever.

Question: Give the names of two energy sources that you would consider to be exhaustible. Give reasons.
Answer: Coal and petroleum. They take millions of years to form and their reserves are limited.

Question: What are the disadvantages of fossil fuels?
Answer: The disadvantages of fossil fuels are:

(i) The fossil fuels are limited in nature and are not likely to last for long.

(ii) Burning of fossil fuels causes air pollution.

(iii) Burning of fossil fuels produces carbon dioxide, which contributes to global warming.

(iv) Burning coal and petroleum produces oxides of sulphur and nitrogen, which are acidic oxides. These lead to acid rain, which affects our water and soil resources.

Question: What are the limitations of the energy that can be obtained from the oceans?
Answer: The limitations of the energy that can be obtained from the oceans are:

(i) There are very few sites around the world which are suitable for building tidal dams.

(ii) The rise and fall of sea-water during high and low tides is not enough to generate electricity on a large scale.

Question: What is geothermal energy?
Answer: The heat energy from the hot rocks present inside the earth is called geothermal energy.

Question: What are the advantages of nuclear energy?
Answer: The advantages of nuclear energy are:

(i) A very small quantity of nuclear fuel produces enormous amount of energy.

(ii) It does not produce greenhouse gases.

Question: Explain the limitations of wind energy.

Answer: The limitations of wind energy are :

(i) Wind energy depends on the availability of sufficiently strong and steady winds.

(ii) Wind farms require large areas of land.

(iii) The initial cost of installing wind turbines is high.

Question: What are the environmental consequences of using fossil fuels?
Answer: They are the largest emitters of greenhouse gases such as carbon dioxide and methane. Extraction of conventional fuels threatens the ecological balance in many areas. These fuels cause environmental problems due to pollution.

Question: Can any source of energy be pollution-free? Why or why not?
Answer: No, source of energy is pollution-free. Solar cells are believed to be pollution-free, but even creating them has a negative impact on the environment. In the case of nuclear energy, there is no waste generated following the fusion reaction, but it is not fully pollution-free .

Short Question and Answer :

Question: What kind of mirror – concave, convex or plain – would be best suited for use in a solar cooker? Why?

Answer: A concave mirror would be best suited for use in a solar cooker. A concave mirror can converge sunlight to a focal point, allowing for concentrated heat generation, which is essential for efficient cooking in a solar cooker.

Question: Name two energy sources that you would consider to be renewable. Give reasons for your choices.

Answer: Two renewable sources of energy are solar energy and wind energy. Solar energy is available from the Sun and wind energy is obtained from moving air. These sources of energy are renewable because they are replenished naturally and will not be exhausted by human use in the foreseeable future.

Question: Explain the process of generation of electricity in a thermal power plant and a hydro power plant.

Answer: (a) thermal power plant : Large amounts of fossil fuels are burnt every day in power stations to heat up water to produce steam, which further runs the turbine to generate electricity. The transmission of electricity is more efficient than transporting coal or petroleum over the same distance. Therefore, many thermal power plants are set up near coal or oil fields. The term thermal power plant is used since fuel is burnt to produce heat energy, which is converted into electrical energy.

(b) Hydro Power Plant: Hydro power plants convert the potential energy of falling water into electricity. Since there are very few waterfalls which could be used as a source of potential energy, hydro power plants are associated with dams. In a hydro power plant, water stored in a dam is allowed to fall from a height, which rotates the turbines connected to generators to produce electricity. Hydro power is a renewable source of energy and does not cause environmental pollution during electricity generation

Question: Give the names of two energy sources that you would consider to be exhaustible. Give reasons for your choices.

Answer: Two energy sources that are exhaustible are coal and petroleum. They are exhaustible because they are present in limited quantities in nature and can be exhausted by human activities. They take millions of years to form, so they cannot be replenished within a short period.

Question: Distinguish between renewable and non-renewable sources of energy.

Answer: The difference between renewable and non-renewable sources of energy are :

Renewable sources of energy	Non-renewable sources of energy
(a) These sources of energy are replenished naturally in a short period.	(a) These sources of energy are available in limited quantities and take millions of years to form.
(b) They can be used repeatedly without being exhausted quickly.	(b) They get depleted with continuous use.
(c) They cause less pollution during use.	(c) They generally cause more pollution when burnt.
Examples: Solar energy, wind energy and water energy.	Examples: Coal, petroleum and natural gas.

Question: Distinguish between conventional and non-conventional sources of energy with examples. Why are non-conventional sources preferred?

Answer: Distance between the conventional and non-conventional sources of energy with examples.

Conventional sources of energy	Non-conventional sources of energy
(a) These are the sources of energy that have been used traditionally for a long time.	(a) These are alternative sources of energy used to meet our growing energy needs.
(b) Many conventional sources, such as coal and petroleum, are exhaustible.	(b) Many non-conventional sources, such as solar and wind energy, are renewable.
(c) They generally cause more pollution when fossil fuels are burnt.	(c) They generally cause less pollution during use.
Examples: Coal, petroleum, firewood and hydropower.	Examples: Solar energy, wind energy, tidal energy and geothermal energy.

Non-conventional sources of energy are preferred because they are renewable and can help meet our growing energy needs. They cause less pollution during use and reduce our dependence on exhaustible fossil fuels such as coal and petroleum.

Example : solar energy, wind energy, tidal energy and geothermal energy.

Question: What are the limitations of energy obtained from the oceans and geothermal sources?

Answer: The limitations of energy obtained from oceans and geothermal sources:

Ocean energy: (a) Only a few places in the world are suitable for building dams to utilise tidal energy.

(b) The rise and fall of seawater during tides is not sufficient to generate electricity on a large scale.

Geothermal energy: (a) Geothermal power plants can be set up only in places where underground heat is available near the Earth's surface.

(b) Such suitable sites are limited, so geothermal energy cannot be used everywhere.

Question: Differentiate between nuclear fission and nuclear fusion.

Answer: The difference between Nuclear Fission and Nuclear Fusion are :

Nuclear Fission	Nuclear Fusion
(i) A heavy nucleus splits into two or more lighter nuclei.	(i) Two or more light nuclei combine to form a heavier nucleus.
(ii) It is used in nuclear power plants to generate electricity.	(ii) It occurs in the Sun and other stars.

Question: Distinguish between fossil fuel and solar energy as direct source of energy .[2M 2015]

Answer: The distinguish between fossil fuels and solar energy as direct sources of energy are :

Fossil fuels	Solar energy
(a) Fossil fuels are exhaustible sources of energy.	(a) Solar energy is a renewable source of energy.
(b) They cause pollution when burnt.	(b) It is a clean source of energy during use.
(c) They take millions of years to form.	(c) It is obtained directly from the Sun.
(d) They can be stored and transported easily.	(d) It is difficult to store and is not available at night.

Question: Write short note on any one of the following : [2M 2015]

(a) Hydro Power Plant (b) Solar Cooker

Answer: (a) Hydro Power Plant: Hydro power plants convert the potential energy of falling water into electricity. Since there are very few waterfalls which could be used as a source of potential energy, hydro power plants are associated with dams. In a hydro power plant, water stored in a dam is allowed to fall from a height, which rotates the turbines connected to generators to produce electricity. Hydro power is a renewable source of energy and does not cause environmental pollution during electricity generation.

(b) A solar cooker is a device which uses solar energy for cooking food. It consists of a box painted black from inside and covered with a glass sheet. The black surface absorbs heat, while the glass sheet traps heat inside the box. A plane mirror is used to reflect more sunlight into the box. Solar cookers are pollution-free and economical, but they cannot be used during the night or on cloudy days .

Question: Name two energy sources that you would consider to be renewable. Give one reason for your choice . [2025 2M]

Answer: Two renewable energy sources are solar energy and wind energy.

Solar energy comes from the Sun which will keep shining for about 5 billion years more. Wind energy is produced due to uneven heating of the Earth which will continue forever. Hence both are renewable.

Question: Why are we looking at alternative sources of energy ? Name a non-conventional source of energy and its two advantages. [ SEBA 2018]

Answer: We are looking at alternate sources of energy because the conventional sources of energy, such as fossil fuels, are limited and will be exhausted with time. Their use also causes environmental pollution. Therefore, we need alternative sources of energy that are renewable, less polluting and sustainable.

A non-conventional source of energy is solar energy.

Two advantages of the non-conventional source of energy are:
(i) it is a renewable source that will last as long as the Sun exists, and
(ii) it produces no pollution while generating electricity or heat.

Long Question and Answer :

Question: What are the limitations of extracting energy from— (a) the wind ? (b) waves ? (c) tides ?

Answer: (a) Wind energy farms can be established only at places where wind blows for most of the year. Wind speed should also be sufficiently high to maintain the required speed of the wind turbines. The initial cost of establishing wind energy farms is high.

(b) Wave energy can be used only where waves are sufficiently strong. The technology for harnessing wave energy is not suitable for all coastal regions.

(c) Tidal energy can be harnessed only in a few places where dams can be built across narrow openings of the sea. The construction of such dams is expensive and may affect the marine ecosystem.

Question: What are the qualities of an ideal source of energy ? Given the names of two energy sources that you would consider to be exhaustible . [3M 2019]

Answer: The qualities of an ideal source of energy are :

(i) It should do a large amount of work per unit volume or mass.
(ii) It should be easily accessible.
(iii) It should be easy to store and transport.
(iv) Perhaps most importantly, it should be economical.

Two exhaustible energy sources are coal and petroleum .

Question: Can any sources of energy be pollution free ? Why and why not ? State two limitations of the energy that can be obtained from the oceans. [3M ,2020]

Answer: No, source of energy can be completely pollution free. We might think that a particular source of energy is pollution free, but, in reality, it may cause some environmental damage. For example, in the case of solar cells, the making of solar cells causes environmental damage.

The two limitations of energy obtained from the oceans are:

(i) There are very few sites around the world which are suitable for building tidal dams.

(ii) The rise and fall of sea-water during high and low tides is not enough to generate electricity on a large scale.

Question: What is nuclear energy? Explain nuclear fusion with example. Give advantages and disadvantages.

Answer: Nuclear energy is the energy released during nuclear reactions involving the nuclei of atoms.

Nuclear fusion is the process in which lighter nuclei fuse together to form a relatively heavier nucleus, releasing a tremendous amount of energy.

The advantages of nuclear energy:

(i) A small amount of nuclear fuel produces a large amount of energy.

(ii) It can generate large amounts of electricity without burning fossil fuels.

The disadvantages of nuclear energy:

(i) Radioactive waste is hazardous and requires safe disposal.

(ii) Accidents at nuclear power plants can release harmful radiation into the environment.

Question: What is biomass? Explain how biogas is produced and what are its advantages.

Answer: Biomass is the organic matter obtained from plants and animals, such as wood, cattle dung and agricultural waste, which can be used as a source of energy.

Biogas is produced by the anaerobic decomposition of biomass, such as cow dung, in the presence of water. The mixture is fed into a biogas plant, where bacteria decompose the organic matter in the absence of oxygen and produce biogas. Biogas is a mixture of gases, mainly methane, which is used as a fuel for cooking and lighting.

The advantages of biogas are :

(a) It is a clean and renewable source of energy.

(b) It burns with a smokeless flame and causes less pollution.

(c)The leftover slurry is a good manure for fields.

(d) It helps in the proper disposal of organic wastes.

Question: What are the environmental consequences of the increasing demand for energy? What steps would you suggest to reduce energy consumption?

Answer: The increasing demand for energy has led to the extensive use of fossil fuels like coal and petroleum. Their burning causes air pollution and increases the amount of carbon dioxide in the atmosphere, contributing to global warming. The extraction and use of these fuels also cause environmental damage.

To reduce energy consumption, we should use energy-efficient appliances, switch off lights and fans when not in use, use public transport or bicycles for short distances, and promote renewable sources of energy like solar and wind energy. We should also avoid wasting electricity and use energy resources judiciously to protect the environment.

Question: What are the advantages and disadvantages of using a solar cooker? Are there places where solar cookers would have limited utility?

Answer: Advantages of a solar cooker:

(i) It uses solar energy, which is a renewable source of energy.

(ii) It does not cause pollution during use.

Disadvantages of a solar cooker:

(i) It cannot be used during the night.

(ii) It cannot be used on cloudy days.

Places where solar cookers have limited utility:

Yes, solar cookers have limited utility in places where sunlight is not available for most of the time, such as regions with long winters, frequent cloudy weather or heavy rainfall. This is because solar cookers depend on sunlight for cooking food.

Question: On what basis would you classify energy sources as

(a) renewable and non-renewable ? (b) exhaustible and inexhaustible ?

Are the options given in (a) and (b) the same?

Answer: (a) Renewable sources of energy are those which can be generated again and again in nature. Non-renewable sources are those which are present in limited amounts and cannot be replenished in a short period of time.

(b) Exhaustible sources of energy are those which are present in limited amounts and will get exhausted by human activities. Inexhaustible sources are those which are present in unlimited amounts and are not likely to be exhausted by human activities.

No, the options are not the same. Renewable and non-renewable sources are classified on the basis of replenishment, whereas exhaustible and inexhaustible sources are classified on the basis of availability.

Question: Why is there a need for harnessing non-conventional sources of energy? How can energy be harnessed from the sea in different ways?

Answer: Non-conventional sources of energy are needed because the conventional sources of energy, such as fossil fuels, are limited and may get exhausted in the future. Their use also causes environmental pollution. Therefore, we need to harness non-conventional sources of energy, such as solar energy, wind energy, tidal energy and geothermal energy, to meet our increasing energy demands and reduce environmental pollution.

Energy can be harnessed from the sea in the following ways:

Tidal energy: Tides can be used to generate electricity by constructing dams at narrow openings of the sea. The movement of water during high and low tides is used to rotate turbines.

Wave energy: The kinetic energy of sea waves can be used to generate electricity through specially designed devices.

Ocean thermal energy: The energy available due to the temperature difference between the warm surface water of the ocean and the colder water at greater depths can be used to generate electricity. This system is known as Ocean Thermal Energy Conversion .

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14. Sources of energy SEBA/ASSEB Class 10 Science– Important Questions and Answers | Assam HSLC

SEBA/ASSEB Class 10 Science Chapter 14: Sources of energy Important Questions and Answers | HSLC Assam

Chapter 14: Sources of energy

Multiple choose Question and Answer :

Question: Assertion and Reasoning :

Very Short Question and Answer :

Short Question and Answer :

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