Minerals and Sources of Energy in India: ISC Class 12 Geography

What Sources of Energy is about

Weightage: CISCE publishes no chapter or unit weightage for ISC Geography. Sources of Energy is part of 3. Resources of India and their Utilisation (vi) of the 2027 syllabus and can be asked anywhere in the 70-mark Paper I (Section A one-mark and map items, Section B 4-mark short answers, Section C 7-mark long answers).Source: CISCE ISC Geography (853) syllabus, examination year 2027; ISC 2027 specimen question paper

Key concepts

Classification of minerals

Metallic minerals: contain metals that can be extracted by smelting; usually found in igneous and metamorphic rocks.

• Ferrous: contain iron or are used mainly in making iron and steel: iron ore, manganese, chromite, nickel, cobalt, tungsten.
• Non-ferrous: do not contain iron: copper, bauxite (aluminium), lead, zinc, tin, gold, silver.

Non-metallic minerals: do not yield metals on melting: mica, limestone, gypsum, dolomite, salt, sulphur, potash, diamonds.

Energy (fuel) minerals: coal, petroleum, natural gas (organic), and atomic minerals: uranium and thorium.

Distinction summary:
1. Metallic minerals are usually hard, lustrous, malleable and ductile when processed; non-metallic are not.
2. Metallic minerals are found mostly in old crystalline rocks (Peninsular Plateau); many non-metallic and fuel minerals in sedimentary rocks.
3. Metallic minerals can be recycled; fuel minerals are used up once burnt.

Worked example

[2] Distinguish between ferrous and non-ferrous minerals with two examples of each. (Understand)

Try it first, then show the solutionSolution

1. Ferrous: contain iron or are used in iron and steel making; iron ore, manganese - 1 mark.
2. Non-ferrous: metallic minerals without iron; copper, bauxite - 1 mark.

Answer: Ferrous minerals contain iron or are used mainly in making iron and steel, such as iron ore and manganese. Non-ferrous minerals are metallic minerals without iron, such as copper and bauxite.

Iron ore and mica: leading states, centres and uses

Iron ore

• Types: haematite (high grade, about 60-70 per cent iron) and magnetite (highest grade, up to 70 per cent, magnetic); limonite and siderite are lower grade.
• Leading state: Odisha (more than half of output). Centres: Keonjhar district (Barbil, Joda), Sundargarh and Mayurbhanj (Gorumahisani, Badampahar).
• Other states and centres: Chhattisgarh (Bailadila in Dantewada: very high-grade haematite, large mechanised mines, ore exported via Visakhapatnam; Dalli-Rajhara supplies Bhilai); Karnataka (Bellary-Hospet, Kudremukh); Jharkhand (Noamundi, Gua).
• Uses: making pig iron and steel for construction, machinery, railways, ships and vehicles; the base of heavy industry. Also exported.

Mica

• Properties: splits into thin, transparent, flexible sheets; excellent insulator; withstands high voltage; low power loss.
• Leading state: Andhra Pradesh. Centre: Nellore district.
• Other states and centres: Jharkhand (Koderma, Hazaribagh belt), Rajasthan (Bhilwara, Ajmer).
• Uses: electrical and electronic industry (insulators, condensers, capacitors), paints, cosmetics, lubricants.

Worked example

[4] Mention two properties of mica that make it important in the electrical industry. Name the leading mica-producing state and one centre in it. (Recall)

Try it first, then show the solutionSolution

1. Excellent insulating properties - 1 mark.
2. Withstands high voltage; low power loss; splits into thin, flexible sheets - 1 mark.
3. Leading state: Andhra Pradesh - 1 mark.
4. Centre: Nellore - 1 mark.

Answer: Mica is an excellent insulator that can withstand high voltage with very low power loss, and it splits into thin, flexible, transparent sheets, which suits capacitors and insulators. Andhra Pradesh is the leading producer, with Nellore the main centre.

Coal and petroleum: distribution, uses, potential and limitations

Coal

• Types: anthracite (best, rare), bituminous (most common, coking coal for steel), lignite (brown coal, low grade: Neyveli in Tamil Nadu), peat.
• Most Indian coal is Gondwana coal (about 200-250 million years old) in the Damodar, Son, Mahanadi and Godavari valleys; Tertiary coal in the north-east.
• Leading states: Jharkhand has the largest reserves (centre: Jharia, the main source of coking coal; also Bokaro). In recent years Odisha (Talcher, Ib valley) and Chhattisgarh (Korba, the largest coalfield of the state, feeding Korba thermal plants and Bhilai) lead production. Others: West Bengal (Raniganj), Madhya Pradesh (Singrauli), Telangana (Singareni).
• Uses: fuel for thermal power (the largest use), coking coal for iron and steel, cement, bricks, chemicals and fertilisers; domestic fuel.
• Potential: abundant reserves make coal the backbone of India's power and steel.
• Limitations: much Indian coal is low grade with high ash; coking coal is scarce and imported; reserves are concentrated in the north-east of the Peninsula, far from western and southern markets, so transport costs are high; non-renewable and polluting.

Petroleum (mineral oil)

• Found in sedimentary rocks of anticlines and fault traps.
• Producing areas: Mumbai High (offshore, the largest producing area); Rajasthan (Barmer basin, Mangala field, the leading onshore state in recent years); Gujarat (Ankleshwar, Kalol); Assam (Digboi, Naharkatiya, Moran).
• Uses: fuel for transport (petrol, diesel, aviation fuel), power, cooking gas (LPG), and raw material for petrochemicals (plastics, fertilisers, synthetic fibres).
• Potential: vital for transport and petrochemical industries.
• Limitations: India produces only a small fraction of its needs and imports most of its crude oil (over four-fifths), a heavy burden on foreign exchange; reserves are limited; prices fluctuate with world markets; non-renewable and polluting.

Worked example

[2] Name the minerals mined at Korba and Bailadila and give one feature of each. (Recall)

Try it first, then show the solutionSolution

1. Korba: coal; one of the largest coalfields, feeding Korba thermal power stations and the Bhilai steel plant - 1 mark.
2. Bailadila: iron ore; very high-grade haematite, large mechanised mines, ore exported via Visakhapatnam - 1 mark.

Answer: Korba in Chhattisgarh mines coal; it is one of the largest coalfields and supplies the Korba thermal power stations and the Bhilai steel plant. Bailadila mines iron ore; its high-grade haematite comes from large mechanised mines and is exported through Visakhapatnam.

Mineral exploitation and effects of mining on the economy

Factors affecting exploitation of minerals:
1. Quantity and quality (grade) of the deposit.
2. Depth and accessibility; whether open-cast or underground mining is needed.
3. Transport to markets and ports.
4. Capital and technology.
5. Demand and market price.
6. Availability of power, water and labour.
7. Government policy, leases and environmental clearances.

Effects of mining on the national economy:
Positive: raw materials for industries (steel, power, cement, aluminium); employment; foreign exchange from exports (iron ore); royalties and revenue for states; growth of towns and infrastructure in mining regions (Dhanbad, Bailadila).
Negative: depletion of non-renewable resources; deforestation, land degradation and water pollution; displacement of tribal people; health hazards to miners; regional inequality where wealth leaves the mining area; dependence on imports for minerals India lacks (crude oil, coking coal).

Worked example

[4] Explain four factors that affect whether a mineral deposit is exploited. (Analyse)

Try it first, then show the solutionSolution

1. Quantity and grade of the deposit - 1 mark.
2. Depth and accessibility; method of mining needed - 1 mark.
3. Transport links to markets or ports - 1 mark.
4. Capital, technology, demand and price; government policy - 1 mark.

Answer: A deposit is worked only if it is large enough and of good enough grade; if it is shallow and accessible, preferably by open-cast mining; if roads, railways or ports can carry the mineral to markets; and if capital, technology, demand and prices make it profitable, within government policy and environmental rules.

Thermal, hydel and nuclear power

Thermal power: produced by burning coal, gas or oil to make steam that turns turbines. It supplies most of India's electricity.
Factors for location: nearness to coalfields (to save the cost of transporting bulky coal) or to ports and railways for imported coal; plentiful water for cooling; nearness to markets; land and capital. Examples: Korba, Singrauli, Talcher, Ramagundam, and pithead plants in the Damodar valley.

Hydel (hydroelectric) power: falling water turns turbines at dams.
Favourable conditions: perennial flow and large volume of water; steep fall or high head (mountains, waterfalls, rapids); silt-free water; suitable dam site with hard rock; capital; nearby market; lack of coal in the region.
Advantages: renewable, pollution-free, cheap to run, multipurpose (irrigation, flood control, drinking water). Limitations: high capital cost, displacement of people, submergence of forests, siltation, dependence on rainfall.
Examples: Bhakra Nangal (Sutlej), Tehri (Bhagirathi), Koyna (Maharashtra), Sharavati (Karnataka), Idukki (Kerala), Nagarjunasagar (Krishna).

Nuclear power: energy released by fission of uranium (and in future thorium) heats water to make steam.
Advantages: large output from a small amount of fuel; no carbon dioxide or air pollution; reduces dependence on coal; suitable for regions far from coal.
Limitations: high cost; radioactive waste; risk of accidents; limited uranium in India.
Centres (any three): Tarapur (Maharashtra, India's first, 1969), Rawatbhata (Rajasthan, near Kota), Kalpakkam (Tamil Nadu), Narora (Uttar Pradesh, on the Ganga), Kakrapar (Gujarat), Kaiga (Karnataka); also Kudankulam (Tamil Nadu).

Worked example

[4] A picture shows a dam with water rushing through open gates. Identify the energy source and give three favourable conditions for its development. (Apply)

Try it first, then show the solutionSolution

1. Hydroelectric (hydel) power, not tidal - 1 mark.
2. Perennial flow and large volume of water - 1 mark.
3. Steep fall or high head of water at a strong dam site - 1 mark.
4. Silt-free water, capital and a nearby market - 1 mark.

Answer: It is hydroelectric power. It needs a perennial river with a large volume of water, a steep fall or high head of water at a site with hard rock for the dam, and silt-free water, with capital to build the project and a market nearby for the electricity.

Conventional versus non-conventional energy

Environmental consequences of conventional (fossil) energy:
1. Global warming: carbon dioxide from burning coal and oil.
2. Air pollution: sulphur dioxide, nitrogen oxides and particulates cause acid rain and respiratory disease.
3. Fly ash from coal-fired plants: dumped in ash ponds, pollutes land and water.
4. Thermal pollution: hot water from cooling discharged into rivers harms aquatic life.
5. Mining damage: land degradation, mine fires (Jharia), deforestation.
6. Oil spills at sea.

Non-conventional (renewable) sources:
1. Solar: very high potential, as most of India gets about 300 sunny days; photovoltaic panels and solar thermal. Rajasthan and Gujarat are best (high insolation, clear skies, large open land); Bhadla Solar Park in Rajasthan is among the world's largest. Limitations: intermittent (night, clouds), needs storage and land, high initial cost.
2. Wind: windmills turn turbines; best along coasts and open plains with strong, steady winds: Tamil Nadu (Muppandal near Kanyakumari), Gujarat, Maharashtra, Karnataka, Rajasthan. Limitations: variable wind, noise, bird deaths, land.
3. Tidal: uses the rise and fall of tides; potential in the Gulf of Khambhat and Gulf of Kachchh (high tidal range) and the Sundarbans. Limitations: very high cost, few suitable sites, harm to coastal ecosystems.
4. Geothermal: heat from the earth's interior; potential at Puga valley (Ladakh) and Manikaran (Himachal Pradesh). Limitations: few sites, remote, still experimental.
5. Biomass and biogas: plant and animal waste burnt or fermented (biogas plants using cattle dung); suited to villages. Limitations: smoke if burnt directly; small scale.

Advantages of non-conventional sources: renewable and inexhaustible; little or no pollution; reduce imports of oil and coal; available locally, suiting remote areas; low running cost.
Need to promote them: fossil fuels are limited and imported; climate commitments; energy security; rural electrification. India has set a target of 500 GW of non-fossil capacity by 2030, and non-fossil sources already supply about half of installed electricity capacity.

Worked example

[4] State two environmental consequences of using coal and two advantages of solar energy. (Evaluate)

Try it first, then show the solutionSolution

1. Coal: global warming from carbon dioxide; air pollution and acid rain - 1 mark.
2. Coal: fly ash and thermal pollution of rivers - 1 mark.
3. Solar: renewable and inexhaustible; abundant sunshine in India - 1 mark.
4. Solar: non-polluting; cuts electricity bills and fossil-fuel use - 1 mark.

Answer: Burning coal releases carbon dioxide that causes global warming and sulphur dioxide and particulates that pollute the air, while coal plants also leave fly ash and discharge hot water that harms rivers. Solar energy, by contrast, is renewable and abundant in sunny India, produces no pollution while generating power, and lowers electricity bills while saving fossil fuels.

Sources of Energy in real life

Each concept, met in an everyday situation. Read the situation, answer the question in your own words, then compare with the model answer. The one-line hook is what to remember.

Topics in this chapter

• Classification of Minerals, Iron Ore, Mica, Coal and Petroleum
• Thermal, Hydel and Nuclear Power and Non-Conventional Energy

Sources of Energy: key facts

Leading states and centres

Iron ore	Odisha (Keonjhar)
Mica	Andhra Pradesh (Nellore)
Coal reserves	Jharkhand (Jharia)
Coal production	Odisha, Chhattisgarh (Korba)
Petroleum	Mumbai High offshore, Rajasthan (Barmer)

Recent years.

Nuclear power stations (map list)

$Tarapur,Rawatbhata,Kalpakkam,Narora,Kakrapar,Kaiga$

Narora is on the Ganga; Tarapur first (1969).

Hydel conditions

Perennial volume + steep fall + silt-free water + dam site + capital + market

Not advantages.

Fossil fuel impacts

Global warming, air pollution, fly ash, thermal pollution, mining damage

Named in the syllabus.

Renewables

Solar (Rajasthan), wind (Tamil Nadu, Gujarat), tidal (Khambhat, Kachchh), geothermal (Puga, Manikaran), biomass

Target 500 GW non-fossil by 2030.

How the board asks Sources of Energy

The question patterns to expect, and the method that works for each.

Tricks to remember Sources of Energy

Short memory aids. Say each one aloud once, then use it on a question the same day.

• Nuclear 'TRiCK NaK'

  Tarapur, Rawatbhata, Kalpakkam, Kaiga, Narora, Kakrapar.

  Use it when: Six nuclear stations on the map list.

• Mica = Nellore

  'Mica makes Nellore glitter' (Andhra Pradesh).

  Use it when: Leading mica state and centre.

• Fossil damage 'G-A-F-T-M'

  Global warming, Air pollution, Fly ash, Thermal pollution, Mining damage.

  Use it when: Environmental consequences.

Sources of Energy: board-level solved questions

Ordered from board level to HOTS. Cover the solution, write your own, then compare step by step.

Case-study practice (Section D style)

Read the situation, then answer every part. In the board paper this is a 7-mark question split into 2 + 2 + 2 + 1 marks.

Where the marks are

How a typical answer is split into step marks. Show every step: a right final answer alone rarely earns full marks.

Where students lose marks in Sources of Energy

The slips examiners see most often, and what to write instead.

• ✗Mistake: Misidentifying the picture and giving advantages instead of conditions

  CISCE examiners' comments, 2024: on a picture of a dam, candidates 'Identified the picture as tidal energy', 'Gave advantages of the source instead of favourable conditions' and 'Could not interpret sustainable development or link energy sources to it'.

  ✓Do this: A dam on a river is hydel power. Conditions are what the site needs (volume, fall, silt-free water); advantages are what the power gives.

  Usually costs: Up to 4 marks.

• ✗Mistake: Confusing coal with iron ore

  CISCE examiners' comments, 2024: on a picture of a black mineral, candidates 'Confused coal with iron ore', 'Did not link coal to being a fossil fuel', and misidentifying the image 'spoiled both parts'.

  ✓Do this: Coal is black, light and dull; link it to 'fossil fuel' at once.

  Usually costs: Up to 4 marks.

• ✗Mistake: Writing 'solar panels' as the energy source and splitting one advantage

  CISCE examiners' comments, 2024: on the solar passage, candidates 'Wrote solar panels or photovoltaic cells instead of solar energy', 'Gave advantages instead of conditions' and 'Repeated one advantage in different words (eco-friendly, non-polluting)'.

  ✓Do this: Name the energy; give distinct advantages: renewable, non-polluting, cheaper bills, saves fossil fuels, low maintenance.

  Usually costs: 1-3 marks.

• ✗Mistake: Writing the state instead of the plant on the map

  CISCE examiners' comments, 2024: candidates 'Wrote Rajasthan instead of Rawatbhata for the plant'.

  ✓Do this: When a plant is marked, write its name (Rawatbhata, Narora, Kaiga).

  Usually costs: 1 mark.

Practice questions on Sources of Energy

Write each answer on paper first. Open the hint only if you are stuck, and the answer only when you have finished.

1. Q1 · 1 mark · Very short answerBoard level

   Name India's first nuclear power station.

   Hint

   Maharashtra, 1969.

   Answer

   Tarapur.

2. Q2 · 1 mark · Very short answerBoard level

   Which state is the leading producer of iron ore?

   Hint

   Keonjhar.

   Answer

   Odisha.

3. Q3 · 1 mark · Very short answerBoard level

   Name the largest oil-producing area of India.

   Hint

   Offshore.

   Answer

   Mumbai High.

4. Q4 · 1 mark · Very short answerHarder board level

   Why is lignite of Neyveli used mainly for power generation?

   Hint

   Low grade.

   Answer

   Lignite is a low-grade, high-moisture coal that is uneconomical to transport, so it is burnt in pithead thermal plants.

5. Q5 · 2 marks · Short answerHarder board level

   [2] Give two limitations of India's coal resources.

   Hint

   Quality and location.

   Answer

   Much of it is low-grade with high ash content and coking coal is scarce; deposits are concentrated in the north-east of the Peninsula, far from western and southern markets, raising transport costs.

6. Q6 · 4 marks · Short answerHarder board level

   [4] Explain four conditions favourable for wind energy and name two leading states.

   Hint

   Strong, steady wind.

   Answer

   (1) Strong winds with high average speed. (2) Steady winds blowing for much of the year. (3) Open land on coasts, plains or passes without obstructions. (4) Grid connection and investment. Leading states: Tamil Nadu (Muppandal) and Gujarat.

7. Q7 · 4 marks · Short answerHOTS / competency

   [4] 'Nuclear energy is important for India, yet its expansion has been slow.' Analyse.

   Hint

   Benefits versus constraints.

   Answer

   Nuclear energy gives large, steady power without carbon emissions or air pollution, reduces coal use and suits regions far from coalfields. But expansion has been slow because plants are very costly and take long to build, India has limited uranium and depends on imports and thorium technology still in development, safety concerns and local protests delay projects, and radioactive waste disposal is difficult.

8. Q8 · 7 marks · Long answerHOTS / competency

   [7] (a) Distinguish between metallic and non-metallic minerals with examples. [2]
   (b) Explain the positive and negative effects of mining on the national economy. [5]

   Hint

   (b) three positive, two negative or vice versa.

   Answer

   (a) Metallic minerals yield metals on smelting (iron ore, copper, bauxite); non-metallic minerals do not (mica, limestone, gypsum). (b) Positive: mining supplies raw materials to steel, power, cement and aluminium industries; it creates jobs and towns such as Dhanbad and Bailadila; and exports of ores and royalties earn revenue and foreign exchange. Negative: it depletes non-renewable resources and degrades land, forests and water; and it displaces tribal people and endangers miners' health, while wealth often leaves the mining region.

Test your recall

Answer in your head or on paper first, then open the card. Pulling an answer out of memory makes it stick far better than re-reading.

1. 1.Leading mica state and centre?Show answer

   Andhra Pradesh; Nellore.

2. 2.Coalfield supplying coking coal to many steel plants?Show answer

   Jharia (Jharkhand).

3. 3.Three nuclear power centres?Show answer

   Tarapur, Kalpakkam, Rawatbhata (also Narora, Kakrapar, Kaiga).

4. 4.Where is tidal energy potential highest?Show answer

   Gulf of Khambhat and Gulf of Kachchh.

5. 5.What is fly ash?Show answer

   Fine ash left after burning coal in thermal plants, which pollutes land, water and air.

Quick revision checklist

The night before the exam: can you do each of these without looking?

• ☐Ferrous: iron ore, manganese. Non-ferrous: copper, bauxite. Non-metallic: mica, limestone.
• ☐Iron ore: Odisha (Keonjhar); Bailadila (Chhattisgarh), Bellary (Karnataka).
• ☐Mica: Andhra Pradesh (Nellore); Koderma (Jharkhand).
• ☐Coal: Jharkhand reserves (Jharia); Odisha (Talcher), Chhattisgarh (Korba) production.
• ☐Petroleum: Mumbai High; Rajasthan (Barmer), Gujarat (Ankleshwar), Assam (Digboi). Most crude imported.
• ☐Nuclear: Tarapur, Rawatbhata, Kalpakkam, Narora, Kakrapar, Kaiga.
• ☐Hydel needs volume, fall, silt-free water; thermal near coal and water.
• ☐Fossil impacts: global warming, air pollution, fly ash, thermal pollution.
• ☐Renewables: solar (Rajasthan), wind (Tamil Nadu), tidal (Khambhat), geothermal (Puga), biomass.

Sources of Energy: frequently asked questions