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Minerals and Energy Resources

NCERT Class 10 · Social Science Based on NCERT Class 10 Social Science textbook · Free CBSE study kit

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Chapter Notes

Overview
This chapter explores the nature, occurrence, distribution, and conservation of minerals and energy resources in India. It explains what minerals are, how they are formed in different rock types, and where they are found across the country. The chapter also covers conventional and non-conventional energy sources, emphasizing the need for sustainable use. The one big idea a student must walk away with is that minerals are non-renewable, finite resources that require careful planning, recycling, and conservation for future generations.
Key Concepts (26)
Mineral
A homogenous, naturally occurring substance with a definable internal structure.
e.g. Diamond (hardest) and talc (softest) are both minerals.
Ore
An accumulation of any mineral mixed with other elements, where the mineral content is in sufficient concentration to make its extraction commercially viable.
e.g. Bauxite is the ore from which aluminium is extracted.
Veins
Smaller occurrences of minerals found in cracks, crevices, faults or joints of igneous and metamorphic rocks.
e.g. Tin, copper, zinc and lead are obtained from veins.
Lodes
Larger occurrences of minerals found in cracks, crevices, faults or joints of igneous and metamorphic rocks.
e.g. Major metallic minerals like tin, copper, zinc and lead are obtained from lodes.
Placer deposits
Alluvial deposits in sands of valley floors and the base of hills containing minerals that are not corroded by water.
e.g. Gold, silver, tin and platinum are found in placer deposits.
Rat-hole mining
A type of mining in Meghalaya where coal is extracted by family members through long narrow tunnels, declared illegal by the National Green Tribunal.
e.g. Coal mining in Jowai and Cherapunjee is done by rat-hole mining.
Ferrous minerals
Minerals that contain iron, accounting for about three-fourths of the total value of the production of metallic minerals.
e.g. Iron ore and manganese are ferrous minerals.
Non-ferrous minerals
Minerals that do not contain iron, playing a vital role in metallurgical, engineering and electrical industries.
e.g. Copper, bauxite, lead, zinc and gold are non-ferrous minerals.
Magnetite
The finest iron ore with a very high content of iron up to 70 per cent, having excellent magnetic qualities valuable in the electrical industry.
e.g. Magnetite is found in Karnataka.
Hematite
The most important industrial iron ore in terms of quantity used, with an iron content of 50-60 per cent.
e.g. Hematite is mined in Odisha-Jharkhand belt.
Mica
A non-metallic mineral made up of a series of plates or leaves that splits easily into thin sheets, used in electric and electronic industries due to its excellent di-electric strength and insulating properties.
e.g. Koderma-Gaya-Hazaribagh belt of Jharkhand is the leading producer of mica.
Limestone
A rock mineral found in sedimentary rocks, composed of calcium carbonates or calcium and magnesium carbonates, used as raw material for cement industry and for smelting iron ore.
e.g. Limestone is essential in blast furnaces for smelting iron ore.
Conventional sources of energy
Energy sources that have been in common use for a long time, including firewood, cattle dung cake, coal, petroleum, natural gas and electricity (both hydel and thermal).
e.g. Coal is a conventional source used for power generation.
Non-conventional sources of energy
Renewable energy sources that are relatively new and environmentally friendly, including solar, wind, tidal, geothermal, biogas and atomic energy.
e.g. Solar energy is a non-conventional source used in rural and remote areas.
Peat
A low-grade coal formed from decaying plants in swamps, with low carbon and high moisture contents and low heating capacity.
e.g. Peat is the first stage of coal formation.
Lignite
A low grade brown coal, soft with high moisture content, used for generation of electricity.
e.g. Principal lignite reserves are in Neyveli, Tamil Nadu.
Bituminous coal
Coal that has been buried deep and subjected to increased temperatures; the most popular coal in commercial use; metallurgical coal is high grade bituminous coal used for smelting iron.
e.g. Jharia, Raniganj, Bokaro are important bituminous coal fields.
Anthracite
The highest quality hard coal.
e.g. Anthracite is the best grade of coal.
Gondwana coal
Coal from a little over 200 million years in age, located in Damodar valley (West Bengal-Jharkhand), Godavari, Mahanadi, Son and Wardha valleys; includes metallurgical coal.
e.g. Jharia coalfield is a Gondwana coal deposit.
Tertiary coal
Coal about 55 million years old, occurring in the north eastern states of Meghalaya, Assam, Arunachal Pradesh and Nagaland.
e.g. Coal in Assam is tertiary coal.
Hydro electricity
Electricity generated by fast flowing water driving hydro turbines; a renewable resource.
e.g. Bhakra Nangal and Damodar Valley Corporation produce hydro electricity.
Thermal electricity
Electricity generated by burning fuels such as coal, petroleum and natural gas to drive turbines; uses non-renewable fossil fuels.
e.g. Thermal power stations use coal to generate electricity.
Biogas
Gas produced from the decomposition of organic matter like shrubs, farm waste, animal and human waste; has higher thermal efficiency than kerosene, dung cake and charcoal.
e.g. Gobar gas plants in rural India use cattle dung to produce biogas.
Geothermal energy
Heat and electricity produced by using the heat from the interior of the Earth; groundwater absorbs heat from rocks and turns into steam to drive turbines.
e.g. Experimental projects in Parvati valley (Manikaran, Himachal Pradesh) and Puga Valley (Ladakh) harness geothermal energy.
Tidal energy
Electricity generated using oceanic tides; floodgate dams trap water during high tide and release it through turbines after the tide falls.
e.g. Gulf of Khambhat and Gulf of Kuchchh in Gujarat provide ideal conditions for tidal energy.
Nuclear or atomic energy
Energy obtained by altering the structure of atoms, releasing heat used to generate electric power; uranium and thorium are used as fuel.
e.g. Uranium from Jharkhand and Aravalli ranges of Rajasthan is used for nuclear power.
How It Works
Formation of minerals in igneous and metamorphic rocks
  1. Minerals in liquid/molten and gaseous forms are forced upward through cavities towards the earth's surface.
  2. They cool and solidify as they rise.
  3. They occur in cracks, crevices, faults or joints as veins (smaller) or lodes (larger).
💡 Major metallic minerals like tin, copper, zinc and lead are obtained from veins and lodes — students often forget that these are formed in igneous and metamorphic rocks, not sedimentary.
Formation of minerals in sedimentary rocks
  1. Minerals occur in beds or layers as a result of deposition, accumulation and concentration in horizontal strata.
  2. Coal and some forms of iron ore are concentrated due to long periods under great heat and pressure.
  3. Gypsum, potash salt and sodium salt are formed as a result of evaporation, especially in arid regions.
💡 Sedimentary minerals are found in horizontal layers (beds/strata) — students often confuse this with the vertical cracks of igneous formations.
Formation of bauxite by decomposition
  1. Surface rocks decompose.
  2. Soluble constituents are removed by weathering.
  3. A residual mass of weathered material containing ores is left behind.
💡 Bauxite is formed by the decomposition of a wide variety of rocks rich in aluminium silicates — it is a residual deposit, not a transported one.
Formation of placer deposits
  1. Minerals that are not corroded by water are transported by water.
  2. They accumulate as alluvial deposits in sands of valley floors and the base of hills.
💡 Gold, silver, tin and platinum are found in placer deposits — these are heavy minerals that resist corrosion.
Formation of coal
  1. Plant material decays in swamps to produce peat (low carbon, high moisture).
  2. With burial and compression, peat transforms into lignite (brown coal, soft).
  3. Further burial and increased temperatures produce bituminous coal (most popular commercial coal).
  4. Maximum compression and heat produce anthracite (highest quality hard coal).
💡 The order of coal quality from lowest to highest: Peat → Lignite → Bituminous → Anthracite. Students often reverse this order.
Occurrence of petroleum
  1. Petroleum is associated with anticlines and fault traps in rock formations of tertiary age.
  2. In regions of folding, oil is trapped in the crest of the upfold (anticline or dome).
  3. The oil-bearing layer is porous limestone or sandstone through which oil may flow.
  4. Oil is prevented from rising or sinking by intervening non-porous layers.
  5. Gas, being lighter, usually occurs above the oil.
💡 Gas is above oil, and oil is above water in a trap — students often think oil is on top.
Generation of hydro electricity
  1. Fast flowing water is used.
  2. Water drives hydro turbines.
  3. Turbines generate electricity.
💡 Hydro electricity is renewable because it uses flowing water, not fossil fuels.
Generation of thermal electricity
  1. Fossil fuels such as coal, petroleum and natural gas are burned.
  2. The heat drives turbines.
  3. Turbines generate electricity.
💡 Thermal electricity uses non-renewable fossil fuels and causes environmental pollution.
Generation of geothermal energy
  1. Where the geothermal gradient is high, high temperatures are found at shallow depths.
  2. Groundwater in such areas absorbs heat from the rocks and becomes hot.
  3. When it rises to the earth's surface, it turns into steam.
  4. This steam is used to drive turbines and generate electricity.
💡 Geothermal energy uses heat from the interior of the Earth — it is not the same as solar or wind energy.
Generation of tidal energy
  1. Floodgate dams are built across inlets.
  2. During high tide, water flows into the inlet and gets trapped when the gate is closed.
  3. After the tide falls outside the floodgate, the water retained flows back to the sea via a pipe.
  4. The water passes through a power-generating turbine.
💡 Tidal energy works on the difference between high and low tide — it is not continuous like river flow.
Exam Traps — Don't Make These Mistakes
⚠ Confusing 'veins' and 'lodes' with sedimentary deposits
✗ Minerals like copper and tin are found in sedimentary rocks in beds and layers.
→ Copper, tin, zinc and lead are obtained from veins and lodes in igneous and metamorphic rocks, not from sedimentary beds. Sedimentary rocks contain coal, iron ore (some forms), gypsum, potash salt and sodium salt.
✓ Major metallic minerals like tin, copper, zinc and lead are obtained from veins and lodes in igneous and metamorphic rocks.
⚠ Mixing up the order of coal grades
✗ The highest quality coal is lignite, and anthracite is the lowest grade.
→ The order from lowest to highest quality is: Peat → Lignite → Bituminous → Anthracite. Anthracite is the highest quality hard coal, while lignite is a low grade brown coal.
✓ Anthracite is the highest quality hard coal, while lignite is a low grade brown coal with high moisture content.
⚠ Thinking 'thermal electricity' is only from coal
✗ Thermal electricity is generated only by burning coal.
→ Thermal electricity is generated by burning coal, petroleum AND natural gas. All three are fossil fuels used in thermal power stations.
✓ Thermal electricity is generated by using coal, petroleum and natural gas to drive turbines.
⚠ Confusing 'magnetite' and 'hematite' properties
✗ Hematite has the highest iron content (up to 70%) and is used in the electrical industry.
→ Magnetite has the highest iron content (up to 70%) and excellent magnetic qualities valuable in the electrical industry. Hematite has a slightly lower iron content (50-60%) but is the most important industrial iron ore in terms of quantity used.
✓ Magnetite is the finest iron ore with up to 70% iron content and magnetic qualities for the electrical industry. Hematite has 50-60% iron and is the most important industrial iron ore.
⚠ Assuming all minerals in India are owned by the government
✗ All minerals in India are nationalised and can only be extracted with government permission.
→ While most minerals are nationalised, in most tribal areas of north-east India, minerals are owned by individuals or communities. For example, coal mining in Meghalaya is done by families through rat-hole mining.
✓ Most minerals in India are nationalised, but in tribal areas of north-east India, minerals are owned by individuals or communities.
⚠ Thinking 'biogas' and 'gobar gas' are different
✗ Biogas is made from farm waste, while gobar gas is made from cattle dung — they are different.
→ Biogas is the general term for gas produced from organic matter. Gobar gas is a specific type of biogas produced from cattle dung. The plants using cattle dung are known as 'Gobar gas plants' in rural India.
✓ Biogas is produced from organic matter; when cattle dung is used, the plants are called 'Gobar gas plants' — gobar gas is a type of biogas.
Compare & Contrast
Iron content
Ferrous minerals
Non-ferrous minerals
Ferrous minerals contain iron (e.g., iron ore, manganese) and account for about three-fourths of the total value of metallic mineral production. Non-ferrous minerals do not contain iron (e.g., copper, bauxite, lead, zinc, gold) and play a vital role in metallurgical, engineering and electrical industries.
Usage history and renewability
Conventional sources of energy
Non-conventional sources of energy
Conventional sources (firewood, coal, petroleum, natural gas, electricity) have been used for a long time and are mostly non-renewable and polluting. Non-conventional sources (solar, wind, tidal, geothermal, biogas, atomic energy) are renewable, environmentally friendly, and are being developed to reduce dependence on fossil fuels.
Source of energy
Hydro electricity
Thermal electricity
Hydro electricity is generated by fast flowing water (a renewable resource) driving hydro turbines. Thermal electricity is generated by burning fossil fuels like coal, petroleum and natural gas (non-renewable resources) to drive turbines.
Iron content and industrial use
Magnetite
Hematite
Magnetite has up to 70% iron content and excellent magnetic qualities valuable in the electrical industry. Hematite has 50-60% iron content and is the most important industrial iron ore in terms of quantity used.
Exam Focus
Marks pattern: Typically 2-3 MCQs (1 mark each), 1-2 Short Answer questions (3 marks each), and 1 Long Answer question (5 marks). Total weightage: 8-10 marks in the board exam.
Most asked: Classification of minerals (ferrous/non-ferrous, metallic/non-metallic) · Distribution of iron ore, coal, petroleum in India (map-based questions) · Conventional vs non-conventional energy sources · Conservation of minerals and energy · Modes of occurrence of minerals (veins, lodes, beds, placer deposits)
Don't skip: Describe the distribution of iron ore/coal/petroleum in India (5 marks LA); Distinguish between conventional and non-conventional sources of energy (3 marks SA); Explain the different modes of occurrence of minerals with examples (3 marks SA); Why do we need to conserve mineral resources? (3 marks SA)
One-Line Revision (read aloud before the exam)
  1. A mineral is a homogenous, naturally occurring substance with a definable internal structure.
  2. An ore is an accumulation of a mineral mixed with other elements, where extraction is commercially viable.
  3. Minerals in igneous and metamorphic rocks occur in cracks as veins (small) or lodes (large), formed when molten/gaseous minerals cool and solidify.
  4. In sedimentary rocks, minerals occur in beds or layers formed by deposition, accumulation, and concentration in horizontal strata.
  5. Bauxite is formed by the decomposition of surface rocks rich in aluminium silicates, leaving a residual mass.
  6. Placer deposits are alluvial deposits in valley sands containing gold, silver, tin, and platinum.
  7. Magnetite is the finest iron ore with up to 70% iron content and magnetic qualities for the electrical industry.
  8. Hematite has 50-60% iron content and is the most important industrial iron ore in terms of quantity used.
  9. The major iron ore belts in India are Odisha-Jharkhand, Durg-Bastar-Chandrapur, Ballari-Chitradurga-Chikkamagaluru-Tumakuru, and Maharashtra-Goa.
  10. Mica is a non-metallic mineral with excellent di-electric strength, used in electric and electronic industries; leading producer is Koderma-Gaya-Hazaribagh belt in Jharkhand.
  11. Coal is formed from compression of plant material over millions of years; grades are Peat (lowest), Lignite, Bituminous, Anthracite (highest).
  12. Gondwana coal (over 200 million years old) is found in Damodar valley; Tertiary coal (55 million years old) is found in north-eastern states.
  13. Petroleum occurs in anticlines and fault traps of tertiary age, with gas above oil and oil above water.
  14. Mumbai High, Gujarat and Assam are major petroleum production areas; Digboi is the oldest oil field in India.
  15. Natural gas is found with petroleum; the Hazira-Vijaipur-Jagdishpur (HVJ) pipeline by GAIL is India's first cross-country gas pipeline.
  16. Hydro electricity is generated by fast flowing water (renewable); thermal electricity is generated by burning fossil fuels (non-renewable).
  17. Non-conventional energy sources include solar, wind, tidal, geothermal, biogas and atomic energy.
  18. Solar energy has a bright future in India because India is a tropical country with enormous sunlight.
  19. Biogas plants using cattle dung are called 'Gobar gas plants' and provide energy and improved manure.
  20. Geothermal energy projects are located in Parvati valley (Manikaran, Himachal Pradesh) and Puga Valley (Ladakh).
  21. Tidal energy can be harnessed in Gulf of Khambhat, Gulf of Kuchchh (Gujarat) and Sunderban regions (West Bengal).
  22. Nuclear energy uses uranium (Jharkhand, Aravalli ranges) and thorium (Monazite sands of Kerala).
  23. Mineral resources are finite and non-renewable; conservation requires recycling, using scrap metals, substitutes, and improved technologies.
  24. Energy saved is energy produced — we should use public transport, switch off electricity when not in use, and use power-saving devices.

MCQs — 10 Questions with Answers

Q1. Haban observes buses and trains moving on roads in Guwahati and asks why his village houses don't move like them. His father explains these vehicles are made of metals like iron and aluminium. Based on the chapter, what is the PRIMARY reason metals are extracted from minerals rather than used directly from rocks?

  • A. Metals in rocks are mixed with other elements and need refining to be commercially viable for use ✓
  • B. Rocks are too hard and cannot be broken to extract metals
  • C. Minerals are found only in urban areas near cities
  • D. Metals lose their properties when mixed with rocks

Answer: A — The chapter states that ore is 'an accumulation of any mineral mixed with other elements' and that 'mineral content must be in sufficient concentration to make extraction commercially viable'; rocks contain minerals but require processing, not that rocks are unbreakable or location-dependent.

Q2. A toothpaste manufacturer lists these minerals in their product: silica, fluorite, titanium oxide, and mica. According to the chapter, which of these minerals serves a HEALTH-PROTECTIVE function rather than a cleaning or cosmetic function?

  • A. Fluorite (source of fluoride) — reduces cavities ✓
  • B. Silica — provides abrasive cleaning action
  • C. Mica — gives sparkle to the paste
  • D. Titanium oxide — makes toothpaste white

Answer: A — The chapter explicitly states 'Fluoride which is used to reduce cavities, comes from a mineral fluorite,' making it health-protective; silica, mica, and titanium oxide are described as cleaning or cosmetic agents.

Q3. Assertion (A): Coal and iron ore found in sedimentary rocks have been concentrated as a result of long periods under great heat and pressure. Reason (R): Sedimentary minerals are always formed by evaporation in arid regions. 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
  • C. A is true but R is false ✓
  • D. A is false but R is true

Answer: C — Assertion A is accurate per the chapter; however, Reason R is false because the chapter states sedimentary minerals form through multiple modes—heat/pressure concentration AND evaporation in arid regions (two different processes), not always by evaporation.

Q4. A mining company in Meghalaya wants to extract coal using traditional rat-hole mining methods. According to the chapter's discussion, what is the PRIMARY environmental or regulatory consequence of this practice?

  • A. The National Green Tribunal has declared such activities illegal and recommended they be stopped ✓
  • B. Rat-hole mining is the most efficient method and is encouraged by the government
  • C. Rat-hole mining extracts coal from placer deposits which are renewable
  • D. The practice is legal because minerals in tribal areas are owned by individuals or communities

Answer: A — The chapter explicitly states 'The National Green Tribunal has declared such activities illegal and recommended that these should be stopped forthwith'; while individual/community ownership is mentioned, it does not override the tribunal's legal ban.

Q5. Assertion (A): Veins and lodes in igneous and metamorphic rocks are formed when minerals in liquid, molten and gaseous forms are forced upward through cavities towards the earth's surface. Reason (R): Tin, copper, zinc and lead are major metallic minerals obtained from veins and lodes. 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 ✓
  • C. A is true but R is false
  • D. A is false but R is true

Answer: B — Both statements are true per the chapter; however, R does not explain WHY A is true—R merely describes WHICH minerals come from veins/lodes, not HOW they form.

Q6. A student reads that 'minerals represent only about 0.3 per cent of total nutrient intake, yet are potent and important.' Which inference about mineral nutrition is BEST supported by this statement from the chapter?

  • A. Minerals are more important than carbohydrates, proteins, and fats because they are potent in small quantities
  • B. Without minerals, the body cannot utilise the other 99.7 per cent of foodstuffs despite their availability ✓
  • C. Mineral deficiency is impossible because they comprise only 0.3 per cent of intake
  • D. Minerals should be avoided in diets because they are too potent

Answer: B — The chapter states 'without them we would not be able to utilise the other 99.7 per cent of foodstuffs,' indicating minerals are essential for nutrient utilization despite low percentage; option A contradicts the statement's emphasis on their small proportion, and C/D misinterpret the significance.

Q7. Assertion (A): Bauxite is formed as a result of decomposition of surface rocks and removal of soluble constituents. Reason (R): Bauxite deposits are found only in sedimentary rock formations. 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
  • C. A is true but R is false ✓
  • D. A is false but R is true

Answer: C — Assertion A is correct per the chapter's description of bauxite formation through weathering; Reason R is false because the chapter discusses bauxite formation as a weathering process (mode iii), separate from sedimentary rock formation.

Q8. Gold, silver, tin and platinum are most commonly found as placer deposits in sands of valley floors. Based on the chapter, what physical property of these minerals makes them suitable for placer deposit formation?

  • A. They are not corroded by water and remain stable in alluvial environments ✓
  • B. They are highly soluble and concentrate in sedimentary layers
  • C. They form veins in igneous rocks that are easily transported downslope
  • D. They evaporate and recrystallise in arid valley regions

Answer: A — The chapter explicitly states these minerals are 'generally contain minerals, which are not corroded by water,' making them suitable for alluvial/placer deposits; options B and D describe sedimentary and evaporative processes respectively, not placer deposits.

Q9. A geologist and a geographer both study minerals in a region. According to the chapter, what is the KEY difference in their areas of interest?

  • A. The geologist studies distribution of mineral resources and economic activities; the geographer studies mineral formation and composition
  • B. The geographer studies minerals as part of the earth's crust for understanding landforms; the geologist focuses on formation, age, and physical-chemical composition ✓
  • C. The geologist extracts minerals commercially; the geographer only observes them in nature
  • D. Both study the same aspects but use different tools and methods

Answer: B — The chapter clearly states 'Geographers study minerals as part of the earth's crust for a better understanding of landforms' and 'A geologist...is interested in the formation of minerals, their age and physical and chemical composition'; option A reverses their interests.

Q10. Assertion (A): Ocean waters contain vast quantities of minerals, but most are too widely diffused to be of economic significance. Reason (R): Common salt, magnesium and bromine are derived from ocean waters because they are concentrated enough to be economically extracted. 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
  • C. A is true but R is false
  • D. A is false but R is true

Answer: A — Both statements are true per the chapter; R correctly explains A by providing examples of minerals that ARE economically extracted from ocean water because they achieve sufficient concentration, contrasting with 'most' minerals that are too diffused.

Flashcards

What is a mineral according to geologists?

A homogenous, naturally occurring substance with a definable internal structure found in varied forms in nature.

Define ore in the context of mineral extraction.

An accumulation of any mineral mixed with other elements where mineral concentration is sufficient to make extraction commercially viable.

What are veins and lodes?

Smaller mineral occurrences in igneous and metamorphic rocks are called veins, while larger occurrences are called lodes.

Name three minerals found in sedimentary rocks as beds or layers.

Coal, iron ore, and gypsum are formed through deposition, accumulation, and concentration in horizontal strata in sedimentary rocks.

What is bauxite and how is it formed?

Bauxite is an ore of aluminium formed through decomposition of surface rocks and removal of soluble constituents, leaving residual weathered material.

What are placer deposits?

Placer deposits are alluvial deposits found in sands of valley floors and base of hills containing minerals not corroded by water like gold and silver.

Name two minerals extracted from ocean waters.

Common salt and magnesium are largely derived from ocean waters; manganese nodules are also found on ocean beds.

What is rat-hole mining and what is its legal status?

Rat-hole mining is a narrow tunnel mining method used in north-east India, but it has been declared illegal by the National Green Tribunal.

What percentage of our total nutrient intake do minerals represent?

Minerals represent only about 0.3 per cent of our total nutrient intake, yet are essential for all life processes.

What is the difference between how geographers and geologists study minerals?

Geographers study minerals for understanding landforms and economic distribution, while geologists focus on formation, age, and physical-chemical composition.

Important Board Questions

Define a mineral and explain why different minerals have different properties like colour, hardness, and crystal forms. [2 marks]

State the definition: homogenous, naturally occurring substance with definable internal structure. Explain that physical and chemical conditions during formation determine the combination of elements, which results in varied properties.

Explain how bauxite is formed and why this mode of formation is different from the formation of minerals in veins and lodes. [3 marks]

Bauxite forms through decomposition of surface rocks with removal of soluble constituents, leaving residual weathered material. Veins and lodes form when molten/gaseous minerals are forced upward through cavities and cool; these occur in igneous/metamorphic rocks while bauxite formation involves surface weathering.

Analyze why minerals from different modes of occurrence (veins, sedimentary layers, placer deposits, and ocean waters) have different economic significance. Explain with specific examples how geographical location and concentration affect the viability of mineral extraction. [5 marks]

Discuss that economic viability depends on mineral concentration in ore, ease of extraction, and closeness to market. Give examples: veins/lodes (tin, copper) are concentrated and easier to extract; placer deposits (gold, silver) are alluvial and require different methods; ocean minerals (salt, magnesium) have lower concentration but some like salt are still economically significant. Explain how geological structure and regional variations in mineral distribution affect which reserves become operational mines.

Assertion-Reason Questions for Minerals and Energy Resources

Q1. Assertion (A):

Iron ore is considered a ferrous mineral and forms the backbone of India's metallurgical industries.

Reason (R):

Ferrous minerals account for about three-fourths of the total value of metallic mineral production in India.

Answer: A — Both A and R are true, and R is the correct explanation of A — Both statements are true. Iron ore is indeed a ferrous mineral that is the foundation of metallurgical industries. The reason correctly explains why ferrous minerals, including iron ore, are so important—they represent three-fourths of metallic mineral production value. The reason provides the correct explanation for why iron ore is considered the backbone of industrial development.

Q2. Assertion (A):

Bauxite is formed through the decomposition of surface rocks and removal of soluble constituents.

Reason (R):

Bauxite is a sedimentary mineral that forms in arid regions through evaporation.

Answer: C — A is true but R is false — The assertion is true according to the text which states bauxite 'is formed this way' (through decomposition and weathering). However, the reason is false—bauxite forms through weathering and decomposition, not through evaporation in arid regions as sedimentary minerals do. Gypsum, potash, and sodium salt form through evaporation, not bauxite. The assertion correctly describes bauxite formation, but the reason provides an incorrect explanation.

Q3. Assertion (A):

Over 2000 minerals have been identified by geologists, yet only a few are abundantly found in most rocks.

Reason (R):

The geological formation of minerals depends on specific element combinations that rarely occur together in nature.

Answer: B — Both A and R are true, but R is NOT the correct explanation of A — Both statements are true. The assertion accurately reflects the text's statement about identified minerals and their abundance distribution. The reason is also true—minerals form from specific element combinations under particular conditions. However, the reason is NOT the correct explanation for why only a few are abundant. The text explicitly states 'These variations exist largely because of the differences in the geological structure, processes and time involved in the formation of minerals,' not because element combinations are rare.

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Case-Based Questions (CBQ) for Minerals and Energy Resources

Case Study:

Deepak's family runs a small toothpaste manufacturing unit in Gujarat. Recently, they analyzed the mineral composition of their product and discovered they use seven different minerals in the formulation. Silica and limestone provide abrasive cleaning action, titanium oxide (from rutile, ilmenite, and anatase) creates the white color, fluorite provides fluoride for cavity prevention, and mica adds sparkle. Additionally, they use aluminum oxide for extra abrasive strength. The plastic tubes containing the paste come from petroleum derivatives. Deepak noticed that changes in raw material availability from their suppliers in different regions affected both production costs and product consistency.

Q1. According to the passage, how many different minerals are used in Deepak's toothpaste formula?

  • A. Three minerals
  • B. Five minerals
  • C. Seven minerals ✓
  • D. Ten minerals

Answer: C

Q2. Which mineral is specifically used in the toothpaste to reduce cavities?

  • A. Titanium oxide from rutile
  • B. Silica from limestone
  • C. Fluorite which contains fluoride ✓
  • D. Mica for sparkle effect

Answer: C

Q3. What does the passage suggest about the relationship between mineral availability and manufacturing?

  • A. Mineral availability has no effect on production
  • B. Changes in raw material availability from different regions affect costs and product consistency ✓
  • C. Only titanium oxide availability matters for production
  • D. Mineral suppliers have no influence on manufacturing decisions

Answer: B

Q4. Which component of the toothpaste mentioned is NOT a mineral?

  • A. Silica
  • B. Plastic tubes made from petroleum ✓
  • C. Titanium oxide
  • D. Fluorite

Answer: B

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Previous Year Questions (PYQ) for Minerals and Energy Resources

Real CBSE board exam questions from past papers — free to attempt.

CBSE 2026 · Set 31/4/1 · 1 mark

Choose the correct option to fill in the blank: [Diagram-based question — skipped]

  • Non-metallic
  • Metallic
  • Precious
  • Energy

CBSE 2026 · Set 31/4/1 · 5 marks

Examine the role of petroleum as an important source of energy and describe its distribution in India.

CBSE 2026 · Set 31/4/1 · 3 marks

On the same outline map of India given for Q. No. 9, locate and label any three of the following with suitable symbols: (i) The major dam constructed on the Chenab river (ii) Nuclear power plant in Maharashtra (iii) Software Technology Park in Tamil Nadu (iv) International Airport in Punjab [Map-based question]

CBSE 2026 · Set 31/4/2 · 1 mark

Choose the correct option to fill in the blank:

  • Non-metallic
  • Metallic
  • Precious
  • Energy

CBSE 2026 · Set 31/4/2 · 5 marks

Examine the importance of Bio-gas energy in rural areas.

CBSE 2026 · Set 31/4/2 · 1 mark

Name the dam built on River Chenab in India.

CBSE 2026 · Set 31/4/3 · 5 marks

Energy is required for all activities. Justify the statement with suitable arguments.

CBSE 2026 · Set 31/5/1 · 1 mark

Choose the appropriate option to fill in the blank: [Question requires blank context — skipped]

  • Non-Ferrous minerals
  • Igneous minerals
  • Energy minerals
  • Ferrous minerals

CBSE 2026 · Set 31/5/1 · 5 marks

Conserving energy is essential for sustainable development. Support the statement with suitable arguments.

CBSE 2026 · Set 31/5/2 · 1 mark

Choose the appropriate option to fill in the blank:

  • Non-Ferrous minerals
  • Igneous minerals
  • Energy minerals
  • Ferrous minerals

CBSE 2026 · Set 31/5/2 · 5 marks

Examine the role of petroleum in an economy.

CBSE 2026 · Set 31/5/3 · 1 mark

Choose the appropriate option to fill in the blank: _______ are found in the igneous and metamorphic rocks and have no organic origin.

  • Non-Ferrous minerals
  • Igneous minerals
  • Energy minerals
  • Ferrous minerals

See all 59 board PYQs for this chapter — open PYQ tab →

Class 10 Social Science Previous Year Questions, Chapter-wise

All 805 CBSE board questions from 2022–2026, sorted by chapter and question type. Free PDF download.

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Class 10 Social Science Map Work

All 87 places on the CBSE 2026-27 map list, with where each is and what to remember, marked with the board years (2022–2026) each was asked. Free PDF download.

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