Maharashtra Board Class 6 Geography Chapter 9 Energy Resources Solutions

Energy Resources Class 6 Questions And Answers

A. What Resource Will Have To Be Used For The Following Work:

 

Question 1. Rohan wants to fly a kite.
Answer: Wind Energy
In simple words: Flying a kite requires the force of moving air, which is known as wind energy.

🎯 Exam Tip: When answering questions about energy use for common activities, think about the most direct and obvious energy source.

 

Question 2. People in an Adivasi hamlet have to be protected from the cold.
Answer: Wood
In simple words: In many rural areas, wood is a traditional and easily accessible resource for generating heat to stay warm.

🎯 Exam Tip: Consider traditional and local resource availability for basic needs, especially in specific geographical or cultural contexts.

 

Question 3. Cooking on a picnic.
Answer: Wood
In simple words: For outdoor cooking like picnics, wood is commonly used as fuel to create a fire for heating food.

🎯 Exam Tip: Think about practical, portable, and readily available fuel sources for outdoor activities.

 

Question 4. Salma wants to iron her clothes.
Answer: Electricity
In simple words: An electric iron uses electricity to generate heat, which is then used to smooth clothes.

🎯 Exam Tip: For modern household appliances, electricity is often the primary energy resource.

 

Question 5. Starting a railway-engine.
Answer: Thermal Energy
In simple words: Older railway engines often relied on thermal energy, typically generated by burning coal, to produce steam and power. Modern diesel and electric engines use different forms, but thermal is a foundational concept.

🎯 Exam Tip: Recall the historical context of energy usage in transportation, specifically the role of steam and thermal energy in early railway systems.

 

Question 6. Heating water for a bath.
Answer: Electricity
In simple words: Water heaters commonly use electricity to quickly warm water for bathing purposes.

🎯 Exam Tip: Identify common household applications where electricity is used for heating.

 

Question 7. After sunset, making light available inside the house.
Answer: Electricity
In simple words: Electric lights are widely used to illuminate houses after sunset, providing visibility and comfort.

🎯 Exam Tip: Recognize electricity as the primary energy source for artificial lighting in homes.

B. Answer The Following Questions:

 

Question 1. Which energy resources does man use the most? Why?
Answer:
(i) The energy resource we use the most is oil as it has a wide array of uses. It is used as fuel which includes petrol, diesel, kerosene, jet fuel, LPG gas, etc.
(ii) It is also used in cosmetics, medicines, paints, lubricants, etc.
In simple words: Humans use oil the most because it is incredibly versatile, serving as fuel for transport, cooking, and electricity generation, and as a base for many industrial products.

🎯 Exam Tip: Focus on the versatility and widespread applications of a resource when explaining its high usage.

 

Question 2. Why are energy resources needed?
Answer:
• The demand for energy resources is increasing due to growing population, urbanisation and growing needs of man.
• Energy resources are needed to prepare food, generate electricity, to propel vehicles and for other domestic and industrial needs.
• We engage in various activities to fulfill our needs, for which we need energy from natural resources.
• Our life will come to a standstill without resources like petrol, wind, natural gas, sunlight, besides other resources.
In simple words: Energy resources are essential because they power our daily lives, from cooking and transportation to generating electricity for homes and industries, making modern life possible.

🎯 Exam Tip: When discussing the necessity of energy resources, cover a broad range of applications from daily life to industrial uses.

 

Question 3. Why do we need to use environment friendly energy resources?
Answer:
• There are many energy resources which are environment-friendly, which are renewable and which aid in harnessing natural processes.
• When we use environment-friendly energy sources such as solar energy, wind energy, energy from waste, etc.
• We are contributing towards environment conservation, preservation and protection.
• This will help in reducing the deterioration of environment due to use of non-eco friendly energy resources apart from reducing problems arising from pollution caused due to burning of fossil fuels and biomass energy, climate change, etc.
• Environment-friendly resources will not only lead to sustainable development but also provide energy security which is the need of the hour.
In simple words: We need to use environment-friendly energy resources to reduce pollution, combat climate change, protect natural ecosystems, and ensure a sustainable energy supply for future generations.

🎯 Exam Tip: Emphasize sustainability, pollution reduction, and climate change mitigation as key reasons for adopting eco-friendly energy.

C. Explain The Differences Using The Points In The Brackets:

 

Question 1. Mineral oil and solar energy
Answer:

Points	Mineral oil	Solar energy
Availability	(i) Limited in nature as it does not last perpetually.	(i) Availability depends on the intensity of sunrays and the duration of sunshine.
Environment-friendliness	(i) It is not environment friendly as its generation leads to pollution. (ii) Being highly inflammable it may cause damage to the environment.	(i) Being pollution-free this is an environment-friendly source of energy.
Advantages	(i) Cheap source of energy. (ii) Aids in thermal and atomic power generation.	(i) A solution to global warming. (ii) Cost effective, provides energy security.
Drawbacks	(i) Pollutes the environment. (ii) Highly inflammable.	(i) Solar panels stop producing electricity after sunset. (ii) Expensive to store this energy.

In simple words: Mineral oil is a finite, polluting fossil fuel, while solar energy is a renewable, clean source dependent on sunlight, with its own storage challenges.

🎯 Exam Tip: When comparing energy sources, clearly contrast their availability, environmental impact, benefits, and limitations using structured points for clarity.

 

Question 2. Hydel power and power from geothermal source
Answer:

Points	Hydel power	Power from geothermal sources
Availability	(i) Obtained from the kinetic energy of running water which is easily available.	(i) Underground heat is utilized to generate power and it is inexhaustible.
Environment-friendliness	(i) Does not cause any degradation of the environment.	(i) It is an exhaustible energy resource that causes minimum pollution.
Advantages	(i) Reuse of water is possible. Easy availability of water in most places. Energy generation is pollution-free.	(i) If used on a large scale and more efficiently it may reduce global warming.
Disadvantages	(i) When water is not available it can't produce electricity. (ii) Humans, flora, and fauna may lose natural habitat when hydel power plants are set up.	(i) Only a few sites have the potential to establish geothermal power plants. (ii) High installation cost is involved. (iii) The energy generation capacity is too small.

In simple words: Hydel power uses flowing water, is generally clean, but can impact ecosystems, while geothermal power uses Earth's internal heat, is inexhaustible at source, but is geographically limited and costly to set up.

🎯 Exam Tip: Focus on the source of energy, environmental impact, and geographical constraints when differentiating between hydel and geothermal power.

Activity:

Show the power generation centres on an outline map of India. Write about one of them. Supplement the information with pictures.

Class 6 Geography Chapter 9 Energy Resources InText Questions And Answers

Can You Tell?

 

Observe The Pictures And Answer The Questions:

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र विभिन्न ऊर्जा संसाधनों के उपयोग को दर्शाते हैं। इसमें लालटेन की रोशनी में पढ़ाई, कार में खनिज तेल का उपयोग, अनाज को हवा से साफ करना (पवन ऊर्जा), एक सौर ऊर्जा पैनल, और प्राकृतिक गैस (एलपीजी/सीएनजी) को ईंधन के रूप में उपयोग करते हुए दिखाया गया है।

 

Question 1. Which energy resource is used in figure 1 to obtain light?
Answer: Kerosene.
In simple words: In the first picture, a kerosene lamp is used to provide light for studying.

🎯 Exam Tip: Carefully observe the details in each image to identify the specific energy resource depicted.

 

Question 2. Where does this resource come from?
Answer: It is found under the land surface and also below the ocean floor.
In simple words: Kerosene, being a petroleum product, is extracted from crude oil deposits found deep beneath the Earth's surface and under the seabed.

🎯 Exam Tip: Relate the energy resource to its natural origin and extraction method.

 

Question 3. Figure 2 shows fuel being filled in a motor car. From where was the energy resource brought to the pump?
Answer: Fuel comes to the pump from petroleum refinery, an industrial process plant where crude oil is being processed and refined.
In simple words: The fuel for the car comes from a petroleum refinery, where crude oil is processed into gasoline and other products before being transported to fuel stations.

🎯 Exam Tip: Understand the supply chain of common fuels, from crude oil extraction to refining and distribution.

 

Question 4. Figure 3 shows Malati with her pinwheel and her father winnowing grain. Who is helping both of them?
Answer: Wind energy.
In simple words: The moving air, or wind, is helping Malati spin her pinwheel and aiding her father in winnowing grain by blowing away the lighter chaff.

🎯 Exam Tip: Connect natural phenomena like wind to their practical applications in both play and agriculture.

 

Question 5. Which energy resource is used for lighting a lamp, running a rickshaw and heating oil as shown in figure 5?
Answer: LPG is used for lighting a lamp and heating oil and CNG is used for running a rickshaw.
In simple words: In the fifth figure, Liquefied Petroleum Gas (LPG) fuels the lamp and heats the oil for cooking, while Compressed Natural Gas (CNG) powers the rickshaw.

🎯 Exam Tip: Differentiate between various forms of natural gas (LPG, CNG) and their specific uses in everyday scenarios.

 

Question 6. What are the various purposes for which man use sunlight?
Answer: For growing foodgrains, drying clothes, heating water and cooking food, to generate electricity and for multiple other uses we use sunlight.
In simple words: Sunlight is used for many purposes, including photosynthesis in plants to grow food, drying clothes, heating water, cooking with solar cookers, and generating electricity through solar panels.

🎯 Exam Tip: List a diverse range of applications for solar energy, covering both natural processes and technological uses.

 

Question 7. For which of the above energy resources do we have to spend money?
Answer: We have to spend money for mineral oil and natural gas.
In simple words: We pay for mineral oil (like petrol or diesel) and natural gas (like LPG or CNG) because these are extracted, processed, and distributed commercial products.

🎯 Exam Tip: Distinguish between freely available natural energy (like wind, direct sunlight) and commercial energy resources that require purchase.

 

Observe The Map And Answer The Questions Given Below:

ℹ️ चित्र व्याख्या (Diagram Explanation): यह भारत का एक मानचित्र है जो प्रमुख कोयला और खनिज तेल क्षेत्रों को दर्शाता है। इसमें विभिन्न राज्यों में कोयला भंडार, खनिज तेल क्षेत्र और गोदावरी नदी बेसिन को चिह्नित किया गया है, जो देश के ऊर्जा संसाधनों का भौगोलिक वितरण प्रस्तुत करता है।

 

Question 1. Name the states which have coal fields
Answer: Odisha, Chhattisgarh, Jharkhand, Madhya Pradesh, Maharashtra, West Bengal and Gujarat.
In simple words: Major Indian states with coal fields include Odisha, Chhattisgarh, Jharkhand, Madhya Pradesh, Maharashtra, West Bengal, and Gujarat.

🎯 Exam Tip: Be able to identify and list key states associated with specific natural resources, especially from a given map.

 

Question 2. Name the mineral oil field in the Arabian Sea.
Answer: Mumbai High.
In simple words: The prominent mineral oil field located in the Arabian Sea is known as Mumbai High.

🎯 Exam Tip: Memorize the names of significant offshore oil fields in India.

 

Question 3. Name two states which have coal fields on a large scale.
Answer:
• Chhattisgarh
• Jharkhand
In simple words: Chhattisgarh and Jharkhand are two major Indian states known for having extensive coal fields.

🎯 Exam Tip: Focus on identifying the most prominent states for resource deposits when asked for examples.

 

Question 4. Which mineral oil fields are located in North-east India?
Answer: Makum, Digboi, Naharkatiya, Nunmati, Lakhani.
In simple words: In North-east India, significant mineral oil fields include Makum, Digboi, Naharkatiya, Nunmati, and Lakhani.

🎯 Exam Tip: Be specific in naming the oil fields when answering questions about regional resource locations.

 

Question 5. The reserves of which mineral are found in the Godavari Basin?
Answer: Coal reserves are found in the Godavari Basin.
In simple words: The Godavari Basin is known to hold significant reserves of coal.

🎯 Exam Tip: Link specific river basins or geographical features to the minerals found within them.

 

Question 6. Which of the states have mineral reserves in the Godavari basin?
Answer: Telangana, Chhattisgarh, Maharashtra and Madhya Pradesh.
In simple words: States like Telangana, Chhattisgarh, Maharashtra, and Madhya Pradesh have mineral reserves located within the Godavari basin.

🎯 Exam Tip: Understand that river basins can span multiple states, and associated resources are found across these states.

 

Question 7. Name four hydel power stations in our state.
Answer: Koyna Hydroelectric project, Jayakwadi Hydroelectric project, Sardar Sarovar Hydroelectric project, Warna Hydroelectric project.
In simple words: Some major hydel power stations in our state include Koyna, Jayakwadi, Sardar Sarovar, and Warna Hydroelectric projects.

🎯 Exam Tip: Be able to recall the names of prominent power projects within your state or region.

 

Question 8. What kind of energy is produced with the help of the devices shown in the photograph?
Answer:

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र सौर ऊर्जा पैनलों को दर्शाता है, जो सूर्य के प्रकाश का उपयोग करके बिजली उत्पन्न करते हैं। Solar Energy is generated.
In simple words: The photograph displays solar panels, which are devices designed to produce solar energy by converting sunlight into electricity.

🎯 Exam Tip: Clearly identify the type of energy generation based on the visual cues provided in diagrams or photographs.

Class 6 Geography Chapter 9 Energy Resources Additional Important Questions And Answers

Fill In The Blanks Choosing The Correct Options:

 

Question 1. In ____ it is necessary to burn the energy resources directly to generate electricity, (geo-thermal power stations, thermal power stations, hydel power stations)
Answer: thermal power stations
In simple words: In thermal power stations, fuel is burned directly to produce heat, which then generates electricity.

🎯 Exam Tip: Understand the basic mechanism of electricity generation for different types of power stations.

 

Question 2. In villages, ____ is used on a large scale for cooking on earthen stoves. (wood, kerosene, liquid petroleum gas)
Answer: wood
In simple words: Wood is widely used in villages as a traditional and accessible fuel for cooking on earthen stoves.

🎯 Exam Tip: Consider the common and readily available fuel sources in rural settings for basic household tasks.

 

Question 3. Low quality coal is used for ____.(industries, thermal power station, cooking)
Answer: cooking
In simple words: Low quality coal, often less efficient, is typically used for domestic purposes like cooking, rather than large-scale industrial or power generation.

🎯 Exam Tip: Differentiate the uses of different grades of coal based on their quality and energy output.

 

Question 4. High quality coal is used in ____ (geo-thermal power stations, thermal power stations, hydel power stations) geo-thermal power stations
Answer: geo-thermal power stations
In simple words: High-quality coal is primarily used in thermal power stations to efficiently generate electricity due to its higher energy content.

🎯 Exam Tip: Remember that higher quality fuels are generally reserved for more demanding applications like large-scale power generation.

 

Question 5. Mineral oil is obtained from under land surface and also ____ (below the ocean floor, on the land surface, decomposed plants and animals)
Answer: below the ocean floor
In simple words: Mineral oil is found in deposits both beneath the land surface and significantly, also below the ocean floor in offshore reserves.

🎯 Exam Tip: Be aware of both terrestrial and marine sources for fossil fuels like mineral oil.

 

Question 6. Mineral oil reserves are ____ in nature. (limited, unlimited, low)
Answer: limited
In simple words: Mineral oil reserves are finite, meaning they are non-renewable and will eventually run out, making them a limited resource.

🎯 Exam Tip: Classify energy resources as either limited (non-renewable) or unlimited (renewable) based on their natural replenishment rate.

 

Question 7. ____ oil is in great demand. (Coal, Mineral, Gas)
Answer: Mineral
In simple words: Mineral oil, encompassing petroleum products like petrol and diesel, is in high demand globally due to its extensive use in transportation and industries.

🎯 Exam Tip: Recognize the term "mineral oil" as a collective name for petroleum products that are in high economic demand.

 

Question 8. Mineral oil is also called ____ (magic oil, priceless treasure, black gold)
Answer: black gold
In simple words: Mineral oil is often referred to as "black gold" due to its dark appearance when extracted and its immense economic value and importance.

🎯 Exam Tip: Know common colloquial terms or metaphors used for important natural resources.

 

Question 9. ____ originate from the remains of dead plants and animals. (Bio-fuels, Hydel power, Kinetic energy)
Answer: Bio-fuels
In simple words: Bio-fuels are derived from recently dead organic matter, such as plants and animal waste, making them a renewable energy source.

🎯 Exam Tip: Understand the biological origin of biofuels as opposed to the geological origin of fossil fuels.

 

Question 10. ____ is used in sailboats. (Solar energy, Wind energy, Geo-thermal energy)
Answer: Wind energy
In simple words: Sailboats harness the power of wind energy to propel themselves across water.

🎯 Exam Tip: Identify straightforward examples of how natural energy sources are utilized in traditional technologies.

 

Question 11. For power generation a wind speed of 40 to ____ is required. (90 kmph, 100 kmph, 50 kmph)
Answer: 50 kmph
In simple words: To efficiently generate electricity using windmills, a minimum sustained wind speed of around 40 to 50 kmph is generally needed.

🎯 Exam Tip: Remember the optimal conditions, such as specific wind speeds, required for efficient energy generation technologies.

 

Question 12. Intensity of solar energy is the maximum in the ____ zone. (torrid, temperate, frigid)
Answer: torrid
In simple words: The torrid zone, located around the equator, receives direct sunlight throughout the year, resulting in the highest intensity of solar energy.

🎯 Exam Tip: Relate geographical zones to the intensity of solar radiation received, with the torrid zone having the highest.

 

Question 13. ____ can be used on a large scale in a peninsular country like India. (Tidal energy, Geo-thermal, Wind energy)
Answer: Tidal energy
In simple words: A peninsular country like India, with its extensive coastline, has significant potential to harness tidal energy from its surrounding oceans on a large scale.

🎯 Exam Tip: Consider geographical features (like coastlines) when evaluating the large-scale potential of different energy sources.

 

Question 14. Underground heat is utilised to generate ____ (hydel power, tidal energy, geo-thermal energy)
Answer: geo-thermal energy
In simple words: Geothermal energy is produced by tapping into the natural heat stored beneath the Earth's surface.

🎯 Exam Tip: Associate the term "geo-thermal" directly with heat from the Earth's interior.

Match The Pairs Correctly:

 

Question 1.
Answer:

Column A	Column B
(1) Hydel power	(b) power obtained from the kinetic energy of running water
(2) Atomic energy	(d) splitting of the atoms of minerals like uranium and thorium
(3) Tidal energy	(a) power generated with the help of the speed and force of waves
(4) Geo-thermal energy	(c) underground heat is utilised to generate power
(5) Wind energy	(f) kinetic energy

1-b
2-d
3-a
4-c
5-f
In simple words: This matching exercise correctly links different energy types like hydel, atomic, tidal, geothermal, and wind with their fundamental sources or operating principles.

🎯 Exam Tip: For matching pairs, understand the core definition or source of each energy type to correctly associate them.

State Whether The Following Statements Are True Or False, Correct The Wrong Statement:

 

Question 1. All substance-based energy resources are conventional.
Answer: False. Except for atomic energy, all other resources are conventional.
In simple words: The statement is false because while many substance-based resources are conventional, atomic energy, which is also substance-based, is considered a non-conventional source.

🎯 Exam Tip: Understand the distinction between conventional and non-conventional energy resources, and note exceptions like atomic energy.

 

Question 2. In the long run, process-based energy resources are environment-friendly.
Answer: True
In simple words: Process-based energy resources, such as solar, wind, and tidal power, typically produce little to no pollution during operation, making them environmentally friendly over time.

🎯 Exam Tip: Focus on the environmental impact during operation to evaluate the friendliness of process-based energy resources.

 

Question 3. Kinetic energy can be used to generate power or electricity.
Answer: True
In simple words: Kinetic energy, which is the energy of motion (like moving water or wind), can be converted into mechanical energy and then into electrical power.

🎯 Exam Tip: Recognize that kinetic energy is a fundamental form of energy that can be harnessed and converted into usable power.

 

Question 4. Low quality coal is used in industries.
Answer: False. Low quality Ooal is used in cooking while high-quality coal is used in industries.
In simple words: The statement is false; low-quality coal is typically used for less demanding applications like cooking, whereas industries and power plants prefer high-quality coal for efficiency.

🎯 Exam Tip: Differentiate the industrial applications of resources based on their quality and energy content.

 

Question 5. Hydel power is not an environmental-friendly energy resource.
Answer: False. Hydel power obtained from the kinetic energy of running water does not cause any degradation of the environment so it is environment-friendly.
In simple words: The statement is false because hydel power generates electricity without burning fuel, thus avoiding air pollution and making it an environmentally friendly option during operation.

🎯 Exam Tip: Focus on the direct emissions during energy generation to assess environmental friendliness; initial construction impacts are a separate consideration.

 

Question 6. Solar energy is maximum in the torrid zone.
Answer: True
In simple words: The torrid zone, being closest to the equator, receives the most direct and consistent sunlight, leading to maximum solar energy intensity.

🎯 Exam Tip: Understand the relationship between geographical zones and the amount of solar radiation received globally.

 

Question 7. Tidal energy is pollution free and everlasting.
Answer: True
In simple words: Tidal energy is considered pollution-free because it doesn't produce greenhouse gases during operation, and it is everlasting as tides are a perpetual natural phenomenon.

🎯 Exam Tip: For renewable energy sources, highlight their lack of pollution and continuous availability as key characteristics.

Name The Following:

 

Question 1. Two examples of substance-based energy resources:
Answer:
• Coal
• Mineral oil
In simple words: Coal and mineral oil are examples of substance-based energy resources because they are physical materials that are consumed to release energy.

🎯 Exam Tip: Understand that substance-based resources are physical materials that are burned or processed to yield energy.

 

Question 2. Two examples of process based energy resources.
Answer:
• Sun
• Wind
In simple words: The Sun (solar energy) and Wind (wind energy) are examples of process-based energy resources as they harness natural processes or forces rather than consuming a physical substance.

🎯 Exam Tip: Identify process-based resources as those that rely on continuous natural phenomena rather than depletable materials.

Question 3. Energy resources which originate from the remains of dead plants and animals:
Answer: Bio-fuels
In simple words: Bio-fuels are energy sources derived from the remains of plants and animals, making them a renewable resource.

🎯 Exam Tip: Remember to clearly define bio-fuels and their origin when asked about energy resources from dead organic matter.

Question 4. Two countries which use atomic energy:
Answer:
• India
• USA
In simple words: India and the USA are two nations that harness atomic energy for various purposes, including electricity generation.

🎯 Exam Tip: When listing countries, ensure accuracy and provide at least the requested number of examples.

Question 5. Two hydel power stations of India:
Answer:
• Bhakra-Nangal in the Punjab
• Koyna in Maharashtra
In simple words: Bhakra-Nangal and Koyna are significant hydroelectric power stations in India, utilizing water flow to generate electricity.

🎯 Exam Tip: It's important to know the names and locations of key energy projects, especially for national geography questions.

Question 6. States in India where windmills have been erected:
Answer:
• Maharashtra
• Karnataka
In simple words: Maharashtra and Karnataka are two Indian states that have established windmills to generate electricity from wind energy.

🎯 Exam Tip: Be precise with state names when asked about geographical distribution of energy resources.

Question 7. Devices which can be run on solar power:
Answer:
• Lamps
• Heaters
In simple words: Lamps and heaters are common household devices that can be powered by solar energy, converting sunlight into usable electricity or heat.

🎯 Exam Tip: Focus on practical applications of solar power when identifying devices that can utilize it.

Question 8. Two places where hot water springs are seen:
Answer:
• Vajreshwari in Maharashtra
• Manikaran in Himachal Pradesh
In simple words: Vajreshwari in Maharashtra and Manikaran in Himachal Pradesh are known for their natural hot water springs, often indicative of geothermal activity.

🎯 Exam Tip: Knowing specific geographical locations related to natural phenomena like hot springs demonstrates good regional knowledge.

Answer The Following Questions In One Sentence Each:

Question 1. How are energy resources classified?
Answer: Energy resources can be classified in many ways such as conventional - non-conventional, biotic - abiotic, renewable - non-renewable, substance-based - process-based, etc.
In simple words: Energy resources are categorized based on their origin, renewability, and the method of their utilization.

🎯 Exam Tip: A comprehensive answer should include multiple classification criteria for energy resources.

Question 2. Write any one difference between: Substance-based energy resources and process based energy resources.
Answer: Generation of substance-based energy resources leads to pollution while that of process based energy resource is pollution free.
In simple words: Substance-based energy sources, like fossil fuels, often cause pollution during use, whereas process-based sources, like solar or wind, are generally pollution-free.

🎯 Exam Tip: When differentiating, clearly state the contrasting characteristic for both types of resources.

Question 3. Write any one use of kinetic energy.
Answer: Kinetic energy can be used to generate power or electricity.
In simple words: Kinetic energy, the energy of motion, is primarily used to generate power or electricity, for example, in wind turbines or hydroelectric plants.

🎯 Exam Tip: Provide a direct and clear application of kinetic energy in your answer.

Question 4. How was coal formed?
Answer: Long ago, plant and animal remains got buried due to earth movements and they were then decomposed due to pressure and heat, leaving behind the element carbon and this is how coal was formed.
In simple words: Coal was formed over millions of years from buried plant and animal remains, transformed by intense heat and pressure into carbon-rich deposits.

🎯 Exam Tip: Detail the key conditions (burial, pressure, heat, time) involved in the formation of coal.

Question 5. Apart from mineral oil what else is found in mineral oil wells?
Answer: In most of the mineral oil wells, apart from minerals, natural gas is also found.
In simple words: Besides mineral oil, natural gas is a common co-product extracted from mineral oil wells.

🎯 Exam Tip: Remember that natural gas often coexists with crude oil in underground reservoirs.

Question 6. Which are the biotic waste materials from which biogas is generated?
Answer: Biogas is generated from biotic waste material such as faeces of animals, dead leaves, shells, etc.
In simple words: Biogas is produced from organic waste materials such as animal manure, dead leaves, and shells through anaerobic digestion.

🎯 Exam Tip: List a few diverse examples of biotic waste to show a comprehensive understanding.

Question 7. Why have some farmers raised biogas plants in their own yards?
Answer: Some farmers have raised biogas plants in their own yards to cater to their domestic needs.
In simple words: Farmers install biogas plants on their property to efficiently meet their own energy needs for cooking and lighting, using readily available organic waste.

🎯 Exam Tip: Connect the installation of biogas plants directly to the immediate, practical needs of farmers.

Question 8. Which is the major problem faced by major metropolitan cities?
Answer: Waste disposal is the major problem faced by major metropolitan cities.
In simple words: Large cities commonly struggle with the significant challenge of effectively managing and disposing of the vast amounts of waste they generate daily.

🎯 Exam Tip: Identifying waste disposal as a primary urban challenge highlights its environmental and logistical importance.

Question 9. How is wind energy used to generate electricity?
Answer: Due to speed of the wind, the windmills turn, generating kinetic energy which in turn is further converted into electricity.
In simple words: Wind energy is converted into electricity when the force of the wind spins the blades of windmills, producing kinetic energy that a generator then transforms into electrical energy.

🎯 Exam Tip: Explain the energy conversion process from wind to kinetic to electrical energy clearly.

Question 10. What does generation of solar power depend on?
Answer: The generation of solar power depends on the intensity of sunrays and the duration of sunshine.
In simple words: Solar power generation is directly influenced by how strong the sunlight is and how long the sun shines.

🎯 Exam Tip: Emphasize both the quality (intensity) and quantity (duration) of sunlight as critical factors.

Question 11. Which are the movements of ocean water that go on continuously?
Answer: Sea waves and tides are the movements of ocean water that go on continuously
In simple words: The continuous movements of ocean water include the rhythmic rise and fall of sea waves and the regular ebb and flow of tides.

🎯 Exam Tip: Differentiate between waves and tides as distinct, continuous movements of ocean water.

Give Geographical Reasons For The Following Statements:

Question 1. Several changes took place in the use of energy resources and devices.
Answer:
• We engage in various activities to fulfill our needs, for which we need energy.
• In the past, human labour and animals were used for many tasks.
• Gradually man's needs increased and with it, several changes took place in the use of energy resource and devices.
In simple words: The evolution of human needs and activities, coupled with technological advancements, led to a shift from relying on manual and animal power to utilizing diverse and more efficient energy resources and devices.

🎯 Exam Tip: Focus on the progression from basic needs and labor to increased demands and technological development as the driving factors for change.

Question 2. The cost of mineral oil is very high.
Answer:
• Mineral oil reserves are limited in nature.
• However, this oil is in great demand. Hence its cost is very high.
In simple words: Mineral oil is expensive because it is a finite resource with limited reserves, yet it faces continuously high global demand due to its widespread use across various sectors.

🎯 Exam Tip: The core reasons for high cost are scarcity (limited reserves) and high demand; mention both for a complete answer.

Question 3. Mineral oil is called 'black gold'.
Answer: Mineral oil is called 'black gold' because it has a blackish colour and it is costly.
In simple words: Mineral oil is termed 'black gold' due to its dark, tarry appearance combined with its immense economic value and high price, much like precious gold.

🎯 Exam Tip: Connect both the physical characteristic (black color) and the economic value (costly/precious) to explain the metaphor 'black gold'.

Question 4. In India, there is a lot of scope for using solar energy.
Answer:
• We get light and heat from the sun.
• We have seen that intensity of solar energy is the maximum in the torrid zone.
• India which is in the torrid zone, therefore, has a lot of scope for using solar energy.
In simple words: India's geographical location within the torrid zone ensures abundant sunlight and high solar energy intensity, providing significant potential for widespread solar energy utilization.

🎯 Exam Tip: Link India's location in the torrid zone directly to the high intensity and duration of solar radiation received, establishing the scope for solar energy.

Question 5. Process-based energy resources are environment-friendly.
Answer: The process-based energy resources cause minimum pollution. So, process-based energy resources are environment-friendly.
In simple words: Process-based energy resources, such as solar or wind power, are considered environment-friendly because their generation methods produce minimal to no pollution, unlike fossil fuels.

🎯 Exam Tip: The key reason for being environment-friendly is the minimal pollution they generate, which should be explicitly stated.

Answer In 2-3 Sentences:

Question 1. Energy from waste material can help solve the problem of waste disposal in cities. Explain.
Answer:
• Waste is generated daily on a very large scale in a big metropolitan cities.
• Waste disposal is a major problem in such places.
• This waste can be segregated to use the biotic component to generate gas which can be used to generate power.
• In the future, this may help to solve the problem of waste disposal in cities
In simple words: Cities generate massive amounts of waste, and by segregating the organic (biotic) components, we can produce biogas to generate power, thereby simultaneously addressing both waste disposal and energy needs.

🎯 Exam Tip: Explain the process of waste-to-energy conversion and its dual benefits: waste management and electricity generation.

Question 2. Explain the term atomic energy.
Answer:
• Splitting of the atoms of minerals like uranium and thorium can be used for power generation.
• In this process, using very small quantities of minerals, energy can be generated on a very large scale.
In simple words: Atomic energy is produced by splitting the nuclei of heavy atoms like uranium or thorium in a process called nuclear fission, which releases a massive amount of energy from a small quantity of fuel.

🎯 Exam Tip: Define atomic energy by mentioning nuclear fission, the specific minerals used, and the high energy yield from small amounts of material.

Question 3. How must we use energy resources?
Answer:
• Energy resources must be used very carefully.
• The demand for energy is increasing all the time due to growing population, urbanisation and growing needs of man.,
• It is necessary to use alternative and non- conventional energy resources to meet these needs.
• It is also necessary to use energy frugally.
In simple words: Given increasing global demand and limited conventional supplies, we must use energy resources carefully, promote frugality, and actively switch to alternative, non-conventional energy sources to ensure sustainable availability.

🎯 Exam Tip: Emphasize responsible usage, conservation (frugality), and the adoption of renewable alternatives as key strategies for energy resource management.