Every syllabus topic, revised in one card

European sea power entered India when Vasco da Gama reached Calicut in 1498. The Portuguese made Goa their chief base after Afonso de Albuquerque captured it in 1510; the English Company was chartered in 1600 and established Fort St George at Madras, while the Dutch used Pulicat, the Danes Tranquebar and the French Pondicherry.

• Vasco da Gama reached Calicut in 1498; Albuquerque captured Goa for Portugal in 1510.
• English East India Company received Queen Elizabeth I's charter on 31 December 1600; Fort St George was at Madras.
• Coromandel settlements: Dutch-Pulicat, Danish-Tranquebar (1620), French-Pondicherry.
• Treaty of Aix-la-Chapelle (1748), after the First Carnatic War, restored Madras to the English.
• Plassey (1757) began Company political dominance in Bengal; Government of India Act 1858 transferred rule to the Crown.

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Food security requires availability, accessibility, affordability or proper utilisation, supported by procurement, storage, buffer stocks and subsidised distribution. India's Green Revolution initially raised wheat output in Punjab, Haryana and western Uttar Pradesh through HYV seeds plus irrigation, fertilisers, pesticides and credit.

• CACP recommends MSP; MSP protects selected crops from sharp price falls and distress sales.
• FCI procures foodgrains and maintains buffer stocks; PDS supplies eligible households at subsidised prices.
• PMFBY (2016) insures crop losses from natural calamities, pests and diseases.
• Yellow Revolution targeted edible oilseeds such as mustard, sunflower and soybean.
• Crop rotation maintains soil fertility and breaks pest cycles; warehousing reduces post-harvest loss.

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Article 368 governs constitutional amendment: the usual special majority is a majority of each House's total membership plus two-thirds of members present and voting; specified federal changes also need ratification by at least half the states. Landmark amendments include the 42nd, 44th, 52nd, 61st, 73rd, 86th and 101st.

• 42nd Amendment (1976): the 'Mini Constitution'; added Fundamental Duties and changed the Preamble.
• 44th Amendment (1978): moved the Right to Property to Article 300A and tightened Emergency safeguards.
• 52nd Amendment inserted the Tenth Schedule; 61st Amendment (1988) lowered voting age from 21 to 18.
• 73rd Amendment constitutionalised Panchayats; 86th Amendment (2002) inserted Article 21A for ages 6-14.
• 101st Amendment (2016) created the GST framework through Articles 246A, 269A and 279A.

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For awards, classify the honour before memorising a recipient or annual count: civilian, wartime gallantry, literature, sport or distinguished service. Then pair the award with its field, awarding authority and official announcement. Treat edition-specific totals and ceremony details as updateable facts to verify from the issuing institution.

• Bharat Ratna is India's highest civilian award.
• Param Vir Chakra is the highest wartime military gallantry decoration.
• Jnanpith is a literary honour; Major Dhyan Chand Khel Ratna is the highest sporting honour.
• Padma awards are grouped as Padma Vibhushan, Padma Bhushan and Padma Shri.
• For a ceremony question, distinguish gallantry awards from distinguished-service awards before checking the official release.

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RBI, operating since 1 April 1935 and nationalised in 1949, is India's central bank and the government's banker, agent and debt manager. Monetary policy controls money supply, credit and liquidity through rates, reserve requirements and market operations; tighter rates or reserves generally reduce lending and inflationary pressure.

• Repo: RBI lends short term to banks against government securities; reverse repo: RBI borrows from banks.
• CRR is cash banks keep with RBI; SLR is liquid assets such as cash, gold and unencumbered government securities.
• RBI Act amendment in 2016 established MPC under flexible inflation targeting: CPI Combined at 4% plus or minus 2%.
• Fourteen major commercial banks were nationalised on 19 July 1969.
• SEBI became a statutory securities-market regulator in 1992.

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GDP is the value of final goods and services produced within domestic territory; value added avoids double counting intermediate goods. GDP at market prices equals GDP at factor cost plus net indirect taxes, while subtracting depreciation converts gross to net. NNP at factor cost is National Income.

• Per capita income equals National Income divided by total population.
• Transfer payments such as pensions and scholarships are excluded because they reflect no current production.
• Depreciation is loss in fixed-capital value through wear, age or obsolescence.
• Primary sector includes agriculture, forestry, fishing and mining.
• HDI combines life expectancy, education and GNI per capita; Gini runs 0 for equality to 1 for maximum inequality.

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Bhakti stressed personal devotion: Kabir taught nirgun devotion to a formless divine, while Tamil Nayanmars and Alvars practised Shaiva and Vaishnava devotion. Sufi Chishti teaching stressed love, charity, service and openness to ordinary people; sama meant devotional listening, often with music.

• South Indian Bhakti: 63 Nayanmars devoted to Shiva and 12 Alvars devoted to Vishnu.
• Andal was the woman Alvar poet devoted to Vishnu; Tukaram composed Marathi Abhangs in the Varkari tradition.
• Adi Shankara taught Advaita; Ramanuja taught Vishishtadvaita.
• Khwaja Moinuddin Chishti's famous centre is at Ajmer; Chishtis stressed love, charity and service.
• Akbar's Din-i-Ilahi (1582) was a syncretic spiritual order linked with sulh-i-kul, not a mass formal religion.

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The cell is life's structural and functional unit; its nucleus controls activities and heredity, while mitochondria produce ATP through respiration. Normal human somatic cells have 46 chromosomes in 23 pairs. In plants, chloroplasts photosynthesise, xylem carries water and minerals upward, and phloem distributes prepared food.

• Pancreatic beta cells secrete insulin to lower blood glucose; nephron is the kidney's functional unit.
• Red blood cells use haemoglobin to transport oxygen; Karl Landsteiner discovered the ABO blood groups.
• Stomata regulate gas exchange and transpiration; water imbibition activates seed-germination metabolism.
• C4 plants concentrate CO2 in bundle-sheath cells, suppressing photorespiration in warm bright conditions.
• DNA fingerprints are highly individual except in identical twins.

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Fiscal policy uses government taxation, spending and borrowing. Fiscal deficit is total expenditure minus revenue receipts and non-debt capital receipts, so it measures borrowing need; revenue deficit is revenue expenditure minus revenue receipts. Revenue spending normally creates no asset, while capital spending creates assets or reduces liabilities.

• GST is a destination-based indirect tax on supply that subsumed central excise, service tax, CST and several state levies.
• Direct-tax impact and incidence fall on the same person; in a progressive tax, the rate rises with income.
• Capital receipts include borrowing and loan recovery; borrowing creates a liability.
• Article 280 Finance Commission recommends Union-state tax distribution.
• Zero-based budgeting justifies each expense afresh; disinvestment sells government equity in PSUs.

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The Seventh Schedule divides legislative subjects among the Union, State and Concurrent Lists. Both levels may legislate on the Concurrent List, but Union law normally prevails on conflict under Article 254; residuary powers belong to Parliament. Fiscal and intergovernmental coordination operate through bodies such as the Finance Commission and Inter-State Council.

• Concurrent List is List III of the Seventh Schedule; both Parliament and state legislatures can legislate on it.
• Article 254 governs repugnancy on Concurrent List matters; Union law normally prevails.
• Residuary legislative powers belong to Parliament; the State List covers matters such as police and public order.
• Article 200 allows a Governor to reserve a state bill for the President; Article 201 governs action on it.
• The Finance Commission is normally constituted every five years; Article 263 provides for the Inter-State Council.

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Acids have pH below 7 and turn blue litmus red; neutral solutions are pH 7, and a water-soluble base is an alkali. Acid plus base gives salt and water, while dilute acid plus an active metal gives salt and hydrogen. The modern periodic table follows increasing atomic number; metals are generally malleable.

• Rusting needs oxygen and moisture; chromium's protective oxide helps stainless steel resist corrosion.
• Alloys: brass is copper-zinc; bronze is copper-tin; mercury is liquid at room temperature.
• Graphite conducts electricity despite being a non-metal; reactive sodium is stored under kerosene.
• Water is H2O; limestone is mainly calcium carbonate; baking soda is sodium bicarbonate, NaHCO3.
• Salt lowers water's freezing point and raises its boiling point; soap has oil-loving and water-loving ends.

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The Cheras, Cholas and Pandyas were the Muvendar, the three crowned rulers of Tamilakam. Chola power and culture are tested through Rajaraja I's Brihadisvara Temple, Rajendra I's northern and Srivijaya campaigns, Uttiramerur village administration and Nataraja bronzes; Madurai was the Pandyan capital.

• Rajaraja I completed the Brihadisvara Temple at Thanjavur in 1010 CE.
• Rajendra I founded Gangaikonda Cholapuram and sent the 1025 CE naval expedition against Srivijaya.
• Uttiramerur inscriptions of Parantaka I explain Kudavolai selection for Chola village assemblies.
• Chola bronzes are famed for Nataraja, Shiva as cosmic Lord of Dance.
• Madurai was the Pandyan capital; Cheran Senguttuvan is linked with the Kannagi or Pattini cult.

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India's monsoon is a seasonal wind reversal driven by summer low pressure over the heated landmass, drawing moisture-laden Indian Ocean winds. The southwest monsoon supplies most annual rain from June to September; the retreating or northeast monsoon draws Bay moisture to Tamil Nadu, often with October-November cyclones.

• Southwest monsoon normally bursts first over Kerala and splits into Arabian Sea and Bay of Bengal branches.
• Orographic rain falls on windward slopes; descending leeward air creates a rain shadow.
• Aravallis run parallel to monsoon flow, helping keep the Thar arid; Coimbatore lies in a Western Ghats rain shadow.
• Positive IOD means a warmer western than eastern Indian Ocean and usually strengthens Indian monsoon rainfall.
• Western disturbances bring north-west India winter rain; Loo is a hot dry summer wind; Kal Baisakhi are eastern pre-monsoon storms.

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Constitutional bodies derive authority directly from the Constitution; statutory bodies are created by legislation. High-frequency bodies are the CAG under Article 148, Finance Commission under Article 280, Election Commission under Article 324, and Union and State Public Service Commissions under Article 315. NHRC and Lokpal are statutory bodies.

• CAG: Article 148, appointed by the President; Article 151 routes audit reports through the President or Governor to the legislature.
• Finance Commission: Article 280, normally every five years, recommends Union-state tax distribution.
• UPSC and State PSCs: Article 315; they recruit respectively for Union and state services.
• Election Commission: constitutional body under Article 324; NHRC and Lokpal are statutory bodies.
• Attorney General is under Article 76; the Mandal Commission was constituted under Article 340 and used eleven backwardness indicators.

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Read the title, units and categories first, then translate the requested comparison into arithmetic. Total means add all entries; average is total divided by count; range is maximum minus minimum; mode is the most frequent value. For shares or change, fix the correct denominator before multiplying by 100.

• Percentage of total = category value / total value x 100.
• Percentage increase = (new - old) / old x 100; the old value is the base.
• Complement categories = 100% minus the sum of all stated shares.
• Fraction of respondents = relevant count / total count, then simplify.
• Row position from the other end = total - known position + 1.

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Qutb-ud-din Aibak founded Delhi's Mamluk dynasty; Iltutmish introduced the silver tanka, Alauddin Khalji regulated markets to maintain a cash-paid army, and Muhammad bin Tughlaq shifted the capital to Daulatabad. Babur defeated Ibrahim Lodi at Panipat in 1526; Akbar organised mansabdari and Todar Mal's revenue system.

• First Battle of Panipat, 21 April 1526: Babur defeated Ibrahim Lodi and founded Mughal rule.
• Akbar introduced mansabdari; Raja Todar Mal organised revenue measurement and assessment.
• Shah Jahan built Delhi's Red Fort; Farrukhsiyar's 1717 Farman granted Company trading privileges.
• Harihara I and Bukka I founded Vijayanagara in 1336; it reached its zenith under Krishnadevaraya (1509-1529).
• Ibrahim Adil Shah II wrote Kitab-i-Nauras; Haque-i-Sharb meant irrigation tax.

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Directive Principles of State Policy (Part IV, Articles 36-51) are borrowed from Ireland and are NON-justiciable - they guide the State in making laws but cannot be enforced in court. They are grouped as Socialist, Gandhian and Liberal-Intellectual. Fundamental Duties (Part IV-A, Article 51A) were added by the 42nd Amendment (1976) on the Swaran Singh Committee's recommendation - originally ten, now eleven after the 86th Amendment (2002) added the duty of a parent to provide education. Fundamental Duties are also non-justiciable.

• DPSP: Part IV, Articles 36-51, borrowed from Ireland, non-justiciable.
• Fundamental Duties: Part IV-A, Article 51A, added by the 42nd Amendment (1976), Swaran Singh Committee.
• 11 Fundamental Duties - the 11th (parent to provide education) added by the 86th Amendment, 2002.
• High-frequency DPSPs: Art 44 (Uniform Civil Code), Art 40 (village panchayats), Art 48A (environment).
• FRs and DPSPs are read harmoniously; neither is absolute over the other (Minerva Mills, 1980).

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Disaster management reduces risk through mitigation, preparedness, warning, response and safe recovery. Non-structural measures include early-warning systems and floodplain zoning; preparedness means following official warnings, keeping supplies and knowing evacuation routes. During immediate danger, protect life before property.

• Earthquake magnitude is commonly expressed on the Richter scale; a seismograph records seismic waves.
• During indoor shaking: drop, cover and hold under sturdy furniture.
• Cyclone warnings enable preparation and evacuation before landfall; keep emergency supplies and use safe shelters.
• Tsunamis are commonly generated by undersea earthquakes or sudden seafloor movement.
• For fire, raise the alarm and evacuate; floodplain zoning restricts risky building in flood-prone areas.

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E. V. Ramasamy Periyar launched the Self-Respect Movement in 1925 to build a rational, casteless society, advance women's rights and Tamil identity, and oppose Brahminical hierarchy and superstition. Self-Respect marriages reduced priestly ritual and caste control. The Justice Party represented non-Brahmin interests in the Madras Presidency.

• South Indian Liberal Federation, popularly the Justice Party, was founded in 1916.
• Periyar launched the Self-Respect Movement in 1925.
• In 1944 Periyar transformed the Justice Party into Dravidar Kazhagam.
• Movement aims included rationalism, caste equality, women's rights and opposition to religious orthodoxy.
• Periyar joined Congress, led the provincial Congress, joined the Vaikom struggle, and later headed the Justice Party.

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Article 324 vests the Election Commission with superintendence, direction and control of elections to Parliament, state legislatures, the President and Vice-President. Universal adult franchise gives eligible adult citizens the vote without property, education, caste, religion or wealth qualifications; electoral rolls list eligible voters by constituency.

• Sukumar Sen was India's first Chief Election Commissioner and oversaw the 1951-52 general elections.
• A by-election fills a seat that becomes vacant before the normal term ends.
• The Model Code of Conduct lays down campaign norms for political parties and candidates.
• 'One Nation, One Election' means synchronising Lok Sabha and state assembly elections.
• A State's Advocate General is appointed by the Governor.

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Biodiversity covers variation within genes, among species and across ecosystems. Endemic species occur naturally only in a defined region; extinction means none remain anywhere. In-situ conservation protects species in natural habitats, while food webs show interlinked feeding paths and biodegradable waste can be decomposed by microorganisms.

• Hotspot criterion: at least 1,500 endemic vascular plants and over 70% original-habitat loss.
• India's four hotspots: Western Ghats-Sri Lanka, Himalaya, Indo-Burma and Sundaland including Nicobars.
• Paris Agreement (2015): hold warming well below 2°C and pursue 1.5°C above pre-industrial level.
• Net zero balances greenhouse-gas emissions with equivalent removals; water vapour is the main natural greenhouse gas.
• Namami Gange (2014), implemented through NMCG, addresses sewage, industrial effluent, cleaning and river biodiversity.

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An ecosystem is the interaction of living communities with their physical environment; the biosphere is Earth's life-supporting zone. Energy enters food chains through producers at the first trophic level, while decomposers return nutrients from dead matter. Conservation protects ecosystem, species and genetic diversity.

• Food chains begin with producers; phytoplankton occupy the first trophic level in ponds.
• Decomposers break down dead organisms and recycle nutrients.
• A biodiversity hotspot combines high species richness and endemism with severe habitat threat.
• Biosphere reserves conserve ecosystems, species and genetic diversity; the 3Rs are Reduce, Reuse, Recycle.
• Gulf of Mannar has coral reefs, seagrasses and dugongs; it became India's first marine biosphere reserve.

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Everyday devices apply heat, optics and electricity: a pressure cooker raises water's boiling point, a refrigerator transfers interior heat to its surroundings, and a vacuum layer suppresses conduction and convection. A clinical thermometer rises by thermal expansion; bakelite handles insulate against heat.

• Earthing gives fault current a low-resistance path; a fuse melts under excess current to break the circuit.
• A dentist's concave mirror forms a virtual enlarged image when the tooth is within focal length.
• Parallel equivalent resistance is less than the smallest branch resistance.
• A dry cell converts chemical to electrical energy; baking soda is sodium bicarbonate.
• Thermosphere contains much of the ionosphere; ionised gases support radio-wave reflection.

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Fundamental Rights are guaranteed by Part III (Articles 12-35) and are enforceable in court - you can move the Supreme Court directly under Article 32 (which Ambedkar called the 'heart and soul' of the Constitution) or a High Court under Article 226. After the 44th Amendment (1978) there are six categories: Equality (14-18), Freedom (19-22), Against Exploitation (23-24), Freedom of Religion (25-28), Cultural & Educational (29-30), and Constitutional Remedies (32). The Right to Property was removed as a Fundamental Right by the 44th Amendment and is now only a legal right under Article 300A.

• Article 32 (right to constitutional remedies) is itself a Fundamental Right - the 'heart and soul' of the Constitution.
• Six categories after the 44th Amendment removed the Right to Property (now Art 300A, a legal right).
• Article 14 = equality before law; Articles 15 and 16 permit special provisions/reservations.
• Article 19 freedoms are available only to citizens; Articles 14 and 21 apply to all persons.
• Five writs: Habeas Corpus, Mandamus, Prohibition, Certiorari, Quo Warranto (SC under Art 32, HC under Art 226).

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Tamil Nadu lies entirely south of the Tropic of Cancer and fronts the Bay of Bengal along the Coromandel Coast. The Nilgiris mark the Western-Eastern Ghats junction; Doddabetta is the state's highest peak. The Kaveri builds the Thanjavur delta, while the Western-Ghats-fed Tamiraparani is a key perennial southern river.

• Palk Strait separates Tamil Nadu from Sri Lanka; Gulf of Mannar is rich in coral reefs and marine life.
• Nilgiri Biosphere Reserve, established in 1986, was India's first; Palghat Gap links Tamil Nadu and Kerala.
• Pichavaram and Muthupet contain salt-tolerant tidal mangrove forests.
• Neyveli in Cuddalore has lignite; Mannar and Krishna-Godavari are offshore hydrocarbon basins.
• Papanasam Dam is on Tamiraparani; Bhavani Sagar-Bhavani, Vaigai-Vaigai and Krishnagiri-Thennpennai.

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Sketch the figure, label dimensions and keep perimeter, area and volume units distinct. Use Pythagoras for right-triangle distance or a missing rectangle side. For angles in a ratio, divide the triangle's 180 degrees into total ratio parts. Substitute only after selecting the correct formula.

• Triangle area = 1/2 bh; parallelogram = bh; trapezium = 1/2 h(a+b); rectangle perimeter = 2(l+b).
• Circle circumference = 2 pi r; sector area = theta/360 x pi r squared.
• Cylinder volume = pi r squared h; curved area = 2 pi rh; cuboid volume = lbh.
• Cube total surface area = 6a squared; square perimeter = 4 times square root of its area.
• Clock angle: minute hand = 6m degrees; hour hand = 30h + 0.5m degrees; take the smaller difference.

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Decode every scheme through five fields: sponsoring government or ministry, target beneficiary, core benefit, delivery mode and intended outcome. Separate income support, insurance, health cover, employment guarantee, utility connection, financial inclusion and public-transport schemes; verify changing amounts, coverage and launch data from official portals.

• PM-KISAN is farmer income support; PMFBY is crop insurance; MGNREGA is a rural-household wage-employment guarantee.
• PM-JAY covers hospital care; Ujjwala supports LPG access; Jal Jeevan targets rural household tap connections.
• Jan Dhan is financial inclusion through bank accounts.
• PM-JANMAN targets Particularly Vulnerable Tribal Groups through convergent basic services.
• PM-eBus Sewa concerns urban electric-bus deployment; Project BOLD uses bamboo to restore degraded land.

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The INC began at Bombay in 1885 with A. O. Hume and moved from Moderate petitions to Swadeshi, Home Rule and mass Gandhian struggle. Curzon's 1905 Bengal partition triggered Swadeshi; the 1907 Surat session split Moderates and Extremists. Gandhi led Non-Cooperation, Civil Disobedience and Quit India while constitutional plans shaped the 1947 transfer.

• Non-Cooperation ended after Chauri Chaura (1922); Civil Disobedience began with the Dandi Salt March (1930).
• Lahore Congress under Jawaharlal Nehru adopted Purna Swaraj in 1929; 26 January 1930 was Independence Day.
• Quit India followed the Cripps Mission's failure: resolution at Bombay on 8 August 1942, with 'Do or Die'.
• Lucknow Pact (1916) united INC and Muslim League; Poona Pact (1932) was Gandhi-Ambedkar on reserved seats.
• Cabinet Mission sought a united three-tier federation; Mountbatten Plan of 3 June 1947 provided for partition.

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Buddhist architecture includes stupas for relic worship, chaityas as prayer halls and Ajanta's painted monastic caves. Sanchi is a major Buddhist stupa site. In South India, Pallava Mamallapuram displays rock-cut rathas and the Shore Temple, while the monumental gateway tower of Dravidian temples is the gopuram.

• Ajanta is famous for Buddhist paintings, sculpture and monastic architecture; Sanchi for its Buddhist stupa.
• Chaitya means a Buddhist prayer hall, commonly with a stupa at one end.
• Pallavas patronised Mamallapuram's rock-cut rathas and Shore Temple.
• Gopuram is the monumental gateway tower characteristic of Dravidian temple architecture.
• Gandhara blended Buddhist themes with Greco-Roman forms; Amaravati flourished in Andhra's lower Krishna valley.

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The Bronze Age Harappan civilisation combined planned grid streets, covered brick drains and standardised burnt-brick construction with trade and water engineering. Its script remains undeciphered and iron was unknown. Not every settlement was urban: major cities coexisted with smaller rural sites.

• Mohenjo-daro: Great Bath, grid streets and covered drainage.
• Lothal: brick-lined dockyard showing maritime trade; Kalibangan: furrows interpreted as a ploughed field.
• Dholavira: rock-cut reservoirs and a signboard-like inscription near the northern gateway.
• Harappans used copper and bronze, not iron; many seals were made of steatite.
• Harappan script is still undeciphered; burnt bricks were standard in cities and drains.

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Industrial location reflects raw materials, transport, labour, markets and power. Iron and steel plants favour coal and iron-ore access because inputs are bulky; sugar mills stay near sugarcane because it is bulky and perishable. Software is a tertiary-sector service, while industries processing crops are agro-based.

• India's first successful modern cotton mill was established by C. N. Davar at Mumbai in 1854.
• Coimbatore is the 'Manchester of South India' for cotton textiles and related engineering.
• Jamshedpur grew as an iron-and-steel centre near raw materials and transport; hematite and magnetite are iron ores.
• Bengaluru is a major information-technology and software centre.
• Sivakasi is known for fireworks, safety matches and printing.

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The secondary sector transforms raw materials through manufacturing and construction. MSMEs create employment with relatively little capital, support entrepreneurship, exports and regional development, and often cluster around local skills and supply chains. Public enterprises are government-owned; cottage units use household or local labour and simple tools.

• Industrial Policy Resolution 1948 first defined public and private roles in India's mixed economy.
• 2020 micro-enterprise limit in the bank: investment up to Rs 1 crore and turnover up to Rs 5 crore.
• SIDBI, established 1990, finances and develops MSMEs; industrial estates supply common infrastructure.
• Tamil clusters: Tiruppur-knitwear, Sivakasi-fireworks/matches/printing, Coimbatore-textiles and engineering.
• TIDCO, established 1965, co-promotes large and medium Tamil Nadu projects through equity participation.

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Inflation is a sustained rise in the general price level, reducing money's purchasing power; deflation is a sustained fall. Demand-pull inflation occurs when aggregate demand outruns supply, while cost-push inflation follows higher production inputs such as fuel or wages. CPI tracks household retail-price changes over time.

• Demand-pull: too much demand for available output; contractionary monetary policy can restrain it.
• Cost-push: rising production costs or supply disruption push prices upward.
• Stagflation combines high inflation with stagnant growth and high unemployment.
• Short-run Phillips Curve shows an inverse relationship between inflation and unemployment.
• Price index numbers compare general price levels over time; CPI measures a consumer basket.

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Balance of trade is merchandise exports minus imports; imports exceeding exports create a trade deficit. The current account is wider, recording goods, services, income and current transfers such as remittances. Exports earn foreign exchange, while the exchange rate is one currency's price in another.

• WTO began on 1 January 1995, replacing GATT after the Uruguay Round and Marrakesh Agreement.
• WTO Most Favoured Nation rule means a trade advantage to one member extends to all members.
• IMF promotes international monetary cooperation and balance-of-payments support.
• Special Drawing Rights, created by IMF in 1969, are an international reserve asset called 'paper gold'.
• FDI brings long-term ownership and managerial control; FPI is passive securities investment without control.

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India has a single integrated judiciary with the Supreme Court at the apex (Articles 124-147). SC judges are appointed by the President and hold office until age 65; a High Court judge retires at 62. Removal is only by impeachment for 'proved misbehaviour or incapacity' (Article 124(4)), needing a special majority in both Houses. The SC has original jurisdiction (Centre-State disputes, Article 131), writ jurisdiction (Article 32), appellate jurisdiction, and advisory jurisdiction (Article 143). Judicial review - the power to strike down unconstitutional laws - was anchored by the Basic Structure doctrine in Kesavananda Bharati (1973).

• SC judges retire at 65, High Court judges at 62; both appointed by the President.
• Removal only by impeachment - 'proved misbehaviour or incapacity', Article 124(4), special majority.
• Jurisdictions: Original (Art 131), Writ (Art 32), Appellate, Advisory (Art 143).
• Basic Structure doctrine established in Kesavananda Bharati v. State of Kerala (1973).
• Judicial appointments are made through the Collegium system.

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The 73rd Amendment (1992) added Part IX and the Eleventh Schedule, giving constitutional status to Panchayats; the 74th Amendment did the same for municipalities. Panchayati Raj generally has village, intermediate or block, and district tiers, with the Gram Sabha as the direct democratic body of all registered village voters.

• Article 40 directs the State to organise village panchayats as units of self-government.
• Balwant Rai Mehta Committee (1957) recommended the three-tier Panchayati Raj structure.
• Eleventh Schedule lists 29 Panchayat subjects; Twelfth Schedule lists 18 municipal functions.
• Gram Sabha consists of everyone registered in the electoral rolls for the village Panchayat area.
• 73rd Amendment covers Panchayats; 74th Amendment covers urban local bodies or municipalities.

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Convert words into a diagram before answering. For blood relations, start from the speaker and expand one relation at a time; for directions, fix north and update orientation after every turn; for rows, mark both-end positions. In syllogisms, accept only what the statements force, not what seems plausible.

• Row total = left rank + right rank - 1; the named person is counted twice.
• Opposite walks cancel vectorially; shortest displacement follows the final horizontal and vertical offsets.
• For symbol substitution, replace every symbol first, then apply normal BODMAS.
• Universal statement 'all A are B' places A inside B; a separate 'some B are C' proves no A-C link.
• For family chains, write gender and generation beside every person before naming the relation.

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The Constituent Assembly first met on 9 December 1946 with Sachchidananda Sinha as temporary chairman; Rajendra Prasad became its permanent President. B. R. Ambedkar chaired the seven-member Drafting Committee, aided by Constitutional Adviser B. N. Rau. The Constitution took 2 years, 11 months and 18 days to frame.

• Jawaharlal Nehru moved the Objectives Resolution, which shaped the Preamble.
• The Constitution was adopted on 26 November 1949.
• Members signed the Constitution on 24 January 1950.
• The Constitution came into force on 26 January 1950.
• B. R. Ambedkar chaired the Drafting Committee; B. N. Rau was Constitutional Adviser.

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Mauryan statecraft is known through Kautilya's Arthashastra, Megasthenes' Indica and Ashoka's rock and pillar edicts. After the Kalinga War of 261 BCE, Ashoka's Dhamma stressed moral conduct, tolerance and welfare. Gupta achievement centred on literature, mathematics, astronomy, art and fine gold coinage.

• Megasthenes was Seleucus Nicator's ambassador at Chandragupta Maurya's court and wrote Indica.
• Ashoka's Major Rock Edict XIII records remorse after Kalinga; Dhauli carries important Ashokan edicts.
• Harisena composed the Allahabad Pillar prashasti describing Samudragupta's conquests.
• Chandragupta II used the title Vikramaditya; Aryabhata belonged to the Gupta age.
• Gupta gold coins are called dinaras; the age is noted for literature, science, mathematics and art.

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Money markets handle short-term funds; Treasury Bills are short-term government securities and call money is lending for a day or a few days. Capital markets mobilise long-term funds through shares, debentures and bonds. New issues enter through the primary market; stock exchanges trade already-issued securities.

• A share represents ownership; a debenture holder is a company creditor; a bond is a debt instrument.
• Primary market issues new securities; secondary markets trade existing securities.
• SEBI regulates securities markets and protects investors.
• Treasury Bills belong to the money market because their maturities are under one year.
• Adam Smith's Wealth of Nations (1776) used the 'invisible hand' for self-interest coordinating markets.

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Organise national current affairs by institution and policy domain: law and governance, digital public infrastructure, education, manufacturing, energy, space and environment. For each development record the responsible body, purpose, instrument or platform, affected group and official milestone; refresh mission dates, numerical targets and officeholders from primary releases.

• NPCI operates UPI; RBI regulates payments and is headquartered in Mumbai; ISRO is headquartered in Bengaluru.
• JAM means Jan Dhan-Aadhaar-Mobile, the foundation for digital identity, inclusion and benefit delivery.
• NEP's 5+3+3+4 structure begins with preschool plus Classes 1-2 in the foundational stage.
• Semicon India develops chip design, fabrication and packaging; Make in India promotes manufacturing and investment.
• For space or infrastructure milestones, link payload or project, launch vehicle or location, responsible agency and official date.

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Renewable resources replenish naturally over time; fossil fuels form from ancient organic remains under heat and pressure. Match minerals with use and location: bauxite-aluminium, hematite or magnetite-iron, mica-electrical insulation, Neyveli-lignite, Bombay High-oil and gas, and Jharia-Bokaro coalfields in the Damodar Valley.

• India's EEZ extends 200 nautical miles, giving sovereign resource rights; territorial sea extends 12 nautical miles.
• Bauxite is aluminium ore; hematite and magnetite are iron ores.
• Mica withstands high voltage and is a good electrical insulator; India is a major producer and exporter.
• Bombay High produces offshore petroleum and gas; Neyveli is a lignite and thermal-power centre.
• Chipko protected forests; solar energy is renewable; pipelines carry petroleum, natural gas and water.

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Prime-factorise when finding HCF, LCM or the multiplier for a perfect power. HCF uses the lowest common exponents; LCM uses the highest. For perfect squares pair exponents in twos, for cubes in threes. Simplify brackets, powers and roots before multiplication or division, then addition or subtraction.

• For two positive integers: product of numbers = HCF x LCM.
• To reach the next multiple of divisor d, add d - remainder, unless the remainder is zero.
• If a number leaves one less than each divisor, test LCM(divisors) - 1.
• For fractions, use a common denominator and reduce only after completing the signed arithmetic.
• Remainder on division by 9 equals the digit-sum remainder; direct quotient multiplication works for any divisor.

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A balanced diet supplies carbohydrates, proteins, fats, vitamins, minerals, fibre and water. Deficiency patterns are high-yield: vitamin C-scurvy, vitamin D-rickets, iodine-goitre and iron-anaemia; severe protein-calorie deficiency can cause marasmus. ORS replaces water and salts lost in diarrhoea.

• Malaria: Plasmodium protozoan spread by infected female Anopheles; dengue: virus spread by Aedes.
• Tuberculosis is caused by Mycobacterium tuberculosis; antibiotics treat bacteria, not viruses.
• Golden rice produces beta-carotene, a vitamin A precursor.
• Prions are misfolded infectious proteins causing CJD in humans and BSE in cattle.
• One Health integrates human, animal and environmental health for zoonotic-disease surveillance.

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Parliament comprises Lok Sabha and Rajya Sabha, but the directly elected Lok Sabha controls the Council of Ministers through collective responsibility under Article 75(3). Money Bills under Article 110 are introduced only in Lok Sabha on the President's recommendation, and the Speaker certifies their status; Rajya Sabha may only recommend changes.

• A no-confidence motion can be moved only in Lok Sabha; losing it brings down the Council of Ministers.
• Rajya Sabha's maximum strength is 250; it is permanent, with one-third retiring every two years.
• Vice-President chairs Rajya Sabha; Lok Sabha Speaker presides over joint sittings and certifies Money Bills.
• Quorum in either House is one-tenth of total membership; a private member is an MP who is not a minister.
• A starred question expects an oral answer with supplementaries; an adjournment motion raises an urgent public matter.

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Percentage is part divided by base times 100; always identify the original base. In a ratio, sum the parts to convert a total or equalise the common term to combine ratios. Average is total divided by number of observations, so recover the total first when a value is inserted, removed or missing.

• New average after replacement = old average + (new value - old value) / count.
• Weighted mean = sum(value x frequency) / sum(frequencies); median is the central ordered value.
• Equal increase and decrease percentages do not cancel: +x% then -x% gives x squared/100 percent decrease.
• If a quantity proportional to r squared has radius multiplied by k, its new value is multiplied by k squared.
• For consecutive evenly spaced numbers, the average equals the middle term.

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Appointment questions combine a person with an office, ordinal position and assumption-of-charge date. Build the fact from the appointing or constitutional body's release, not a news summary, and keep it separate from nomination, appointment and election dates. Refresh the card whenever the officeholder changes.

• Record the exact office title and whether the role is constitutional, statutory or executive.
• Distinguish appointment date, notification date and the date charge was actually assumed.
• Ordinal labels such as '26th' need the institution's official historical sequence.
• For Election Commission appointments, use the Election Commission or Gazette release as the primary source.

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India's major physical divisions are the Himalayan Mountains, Indo-Gangetic Plain, Peninsular Plateau, and Coastal Plains and Islands. The young fold Himalayas arose from Indian-Eurasian plate collision; the ancient Peninsular Plateau is crystalline igneous and metamorphic rock, with the Western Ghats forming its western edge.

• Shiwaliks are the outermost Himalayas; the Ganga enters the northern plains at Haridwar.
• Northern Plains are alluvium deposited by the Indus, Ganga and Brahmaputra systems.
• Aravallis are among the world's oldest fold mountain systems; the Great Indian Desert is the Thar.
• Nilgiris lie at the junction of Western and Eastern Ghats.
• Tropic of Cancer crosses 8 states: Gujarat, Rajasthan, MP, Chhattisgarh, Jharkhand, West Bengal, Tripura and Mizoram.

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Mechanics links force, work and energy: action and reaction are equal and opposite, and uniform circular motion keeps speed and kinetic energy constant while velocity direction changes. Electricity follows V = IR; current is amperes, resistance ohms and power watts. Heat crosses solids by conduction and space by radiation.

• Myopia uses a concave lens; a concave lens gives virtual, erect, diminished images; convex lens is real/inverted beyond focus.
• Convex rear-view mirrors give upright diminished images and wide view; star twinkling is atmospheric refraction.
• Gamma rays have shortest wavelength and highest frequency; ultrasound exceeds 20,000 Hz; radar uses radio waves.
• A rising ball gains gravitational potential energy while kinetic energy falls; SI force unit is newton.
• Nuclear fission splits a heavy nucleus, releases energy and neutrons; reactors control the chain reaction.

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The Planning Commission, created in 1950, framed Five Year Plans and allocated plan funds. NITI Aayog, the National Institution for Transforming India, replaced it in 2015 as an executive policy think tank without direct state-fund allocation powers, emphasising cooperative federalism between Union and states.

• First Five Year Plan prioritised agriculture, irrigation and community development.
• Second Plan (1956-1961) used the Mahalanobis model for heavy industry and rapid industrialisation.
• Inclusive growth, central from the Eleventh Plan, spreads opportunities and gains to poor and marginalised groups.
• Raj Krishna coined 'Hindu Rate of Growth' in 1978 for India's earlier low growth trajectory.
• Aspirational Districts Programme targets 112 under-developed districts across health, nutrition, education and livelihoods.

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India's Census is normally decennial. Population density is population divided by area and expressed as persons per square kilometre; sex ratio is females per 1,000 males; and decadal growth compares population change over ten years. Census literacy covers people aged seven and above.

• Census 2011: Bihar had the highest population density among states; Kerala the highest literacy rate.
• A broad-based population pyramid indicates a large proportion of children and young people.
• Urbanisation is an increase in the share of people living in towns and cities.
• A metropolitan city is a very large urban settlement with dense population and extensive services.
• Rural-to-urban migration is commonly driven by jobs, education, healthcare and other services.

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A poverty line identifies people unable to meet minimum consumption needs; Tendulkar's methodology broadened the consumption basket beyond a simple calorie norm. Open unemployment means willing people cannot find jobs; seasonal unemployment follows uneven annual work, while disguised unemployment hides workers whose marginal productivity is near zero.

• MGNREGA Act 2005 guarantees 100 days of notified-wage unskilled work per financial year to a rural household.
• Disguised unemployment is common in agriculture when more workers are present than production requires.
• Underemployment means work time or skill is not fully used; seasonal unemployment reflects lean periods.
• Lorenz Curve represents income or wealth inequality.
• Human-capital formation improves education, health and skills to raise productivity.

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The Preamble, inspired by the US model and beginning 'We, the People', declares India a Sovereign Socialist Secular Democratic Republic and promises justice, liberty, equality and fraternity. Sovereign means independent authority in internal and external affairs; republic means an elected, not hereditary, head of state.

• 42nd Amendment (1976) inserted 'Socialist', 'Secular' and 'Integrity' into the Preamble.
• Liberty in the Preamble covers thought, expression, belief, faith and worship.
• Constitutional supremacy means every institution is bound by the Constitution as the highest law.
• In India's parliamentary system, the executive remains responsible to the legislature.
• The 42nd Amendment is called the 'Mini Constitution' because it made sweeping constitutional changes.

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Keep cost price, marked price and selling price separate. Profit or loss percentage is always measured on cost price; discount is measured on marked price. Apply successive discount, tax or markup factors in order. For interest, convert months to years and distinguish simple linear growth from compounding.

• Profit = SP - CP; loss = CP - SP; profit or loss percent = amount / CP x 100.
• After p% profit, SP = CP(1+p/100); after p% loss, SP = CP(1-p/100).
• Discounted SP = MP(1-d/100); apply GST afterward as a separate multiplication factor.
• Simple interest = PRT/100; amount = P + SI.
• Annual compound amount = P(1+r/100)^n; compound interest = amount - principal.

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For every report or index, learn the publishing institution, dimensions measured, unit or scale, release frequency and what a higher score means. Do not confuse the publisher with a data contributor. Rankings and annual values change; the durable anchor is the index's methodology and official issuing body.

• UNDP publishes the Human Development Index.
• HDI combines health, education and standard-of-living dimensions.
• Its core indicators include life expectancy, schooling measures and GNI per capita.
• Use the latest official report for ranks and scores, while retaining the publisher-method pairing.

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The immediate military spark of the 1857 Revolt was the rumour that new rifle cartridges used cow and pig fat; deeper grievances included Dalhousie's Doctrine of Lapse and the 1856 annexation of Awadh. Lord Canning was Governor-General. V. D. Savarkar's 1909 book framed it as India's First War of Independence.

• Lord Dalhousie's Doctrine of Lapse annexed states lacking a recognised natural male heir, including Jhansi.
• Nana Sahib led at Kanpur; Begum Hazrat Mahal at Lucknow; Rani Lakshmibai at Jhansi.
• Kunwar Singh of Jagdishpur led the revolt in Bihar.
• Awadh annexation alienated talukdars, soldiers and the ruling family.
• Savarkar popularised 'First War of Independence' in The Indian War of Independence 1857 (1909).

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A river basin is the land drained by a river and its tributaries. Himalayan rivers such as Ganga and Brahmaputra are perennial from snow, glaciers and monsoon rain; most Peninsular rivers are rain-fed and seasonal. Godavari is the longest Peninsular river, while Narmada is the largest west-flowing Peninsular river.

• Indus rises near the Mansarovar area in Tibet; Brahmaputra is Tsangpo in Tibet; Yamuna joins Ganga at Prayagraj.
• Godavari, the Dakshin Ganga, rises near Trimbakeshwar, Nashik; Krishna rises near Mahabaleshwar.
• Narmada and Tapi flow west through rift valleys to the Arabian Sea; Sabarmati also flows west.
• Ganga-Brahmaputra-Meghna forms the Sundarbans delta shared by India and Bangladesh.
• Mettur Dam is on Kaveri; Hirakud on Mahanadi; Indira Gandhi Canal draws Sutlej-Beas water at Harike.

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Sangam literature is broadly dated from the 3rd century BCE to the 3rd century CE and divided into Akam love poetry and Puram public or heroic poetry. Tolkappiyam is the earliest extant Tamil grammar and a source on society. Its thinai system links poetic themes with landscapes and livelihoods.

• Kurinji denotes hills and mountains; Neithal the seashore; Marutham fertile agricultural plains.
• Puhar or Kaveripoompattinam was a Chola port; Korkai was a Pandyan pearl-trade port.
• Roman coins and amphora fragments demonstrate trade between Rome and ancient Tamilakam.
• Thirukkural has 1,330 couplets on aram, porul and inbam and is attributed to Thiruvalluvar.
• Sangam corpus includes Ettuthokai, the Eight Anthologies, and Pathupattu, the Ten Idylls.

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CRISPR-Cas9 adapts a bacterial defence system: guide RNA directs Cas9 to cut and precisely edit a target DNA sequence. Biotechnology uses organisms, cells or biomolecules for products such as medicines, crops and fermented goods. Artificial intelligence performs learning, pattern recognition, reasoning and decisions in defined tasks.

• Doudna and Charpentier received the 2020 Chemistry Nobel for CRISPR-Cas9 development.
• AMR grows when microbes evolve drug resistance; misuse and overuse of antibiotics accelerate selection.
• Silicon is a common chip semiconductor; LED means Light Emitting Diode; optical fibre uses total internal reflection.
• PARAM 8000 began C-DAC's indigenous supercomputer series in 1991.
• Tarapur, Maharashtra, operating from 1969, was India's first commercial nuclear power plant.

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For a number series, test first differences, second differences, ratios, alternating rules, squares and forms such as n(n+1); verify a rule against every transition before extending it. For codes, compare each original symbol with its output to identify a fixed alphabet shift, reverse order, mirror alphabet or position-number mapping.

• Fibonacci-type rule: each term equals the previous two terms added.
• Growing odd differences often generate quadratic patterns; n(n+1) gives 2, 6, 12, 20, 30, 42.
• Alphabet-position code uses A=1 through Z=26; Atbash pairs A-Z, B-Y and so on.
• For shifts, apply the same offset to every letter and wrap after Z if needed.
• In seating, draw fixed positions from left to right and place immediate-neighbour clues before finding the middle.

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Nineteenth-century reform associations challenged social inequality and religious orthodoxy through monotheism, Vedic reform, education and service. Raja Rammohan Roy founded Brahmo Samaj in 1828; Dayananda Saraswati founded Arya Samaj in 1875; Vivekananda founded Ramakrishna Mission in 1897; Jyotiba Phule founded Satyashodhak Samaj.

• Brahmo Samaj promoted monotheism and opposed sati, idol worship, child marriage and social evils.
• Ishwar Chandra Vidyasagar championed widow remarriage and women's education in Bengal.
• Prarthana Samaj worked mainly in western India; Narayana Guru's message promoted social equality.
• Thomas Munro introduced Ryotwari in Madras as direct revenue settlement with cultivators.
• Government of India Act 1919 introduced provincial dyarchy: transferred and reserved subjects.

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Soils reflect parent rock, climate and deposition. Black or regur soil forms from basalt, retains moisture and suits cotton; alluvium deposited by rivers dominates northern plains and deltas; red soil's colour comes from iron oxide; laterite develops by intense leaching under high temperature and rainfall and is acidic and nutrient-poor.

• Rice is a kharif crop needing high temperature and abundant water; the irrigated Kaveri delta is Tamil Nadu's rice bowl.
• Bhabar is a porous pebble-gravel belt at the Himalayan foot where streams disappear underground.
• Terrace farming creates level hill fields and slows runoff; contour ploughing reduces slope erosion.
• Jhum is the name for shifting cultivation in many north-eastern hill areas.
• Laterite soil forms through heavy leaching; black soil's high water-holding capacity favours cotton.

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Launch vehicles provide thrust to place spacecraft in orbit; PSLV is ISRO's workhorse for polar missions. A polar satellite scans successive Earth strips as the planet turns, while a geostationary satellite matches Earth's angular speed over the equator. Earth's escape velocity is about 11.2 km/s, and rockets follow Newton's third law.

• Chandrayaan-3's Vikram soft-landed near the lunar south pole on 23 August 2023, a world first for that region.
• Mangalyaan launched in 2013 and entered Mars orbit on 24 September 2014 on India's first attempt.
• Aditya-L1 observes the Sun from Earth-Sun L1 about 1.5 million km from Earth.
• Agni-V is a surface-to-surface ICBM-class ballistic missile with range above 5,000 km; Tejas is an indigenous light combat aircraft.
• Inertial navigation estimates motion with accelerometers and gyroscopes; radar locates objects with reflected radio waves.

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Sports current affairs are easiest to retain as event-person-body links: identify the tournament and edition, athlete or team, governing organisation, result or career action, and announcement date. Prize amounts and retirement news are time-bound, so confirm them from the federation, association or board that issued the release.

• Separate the event organiser from the national body that selects teams or announces rewards.
• For medal incentives, record medal colour, amount, eligible category and announcing organisation.
• For retirement, distinguish retirement from one format from retirement from the entire sport.
• Use the official Olympic association, federation or cricket-board advisory as the source of record.

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At state level the Governor is the constitutional head, while the Chief Minister and Council of Ministers exercise real executive authority and are collectively responsible to the Legislative Assembly. The President appoints the Governor under Article 155; the Governor holds office during the President's pleasure and appoints the Chief Minister.

• A unicameral state legislature has only a Legislative Assembly; in a bicameral state, the upper House is the Legislative Council.
• Tamil Nadu has a 234-seat unicameral Legislative Assembly; its Legislative Council was abolished in 1986.
• The State Council of Ministers is collectively responsible to the Legislative Assembly.
• Article 54's presidential electoral college includes elected MPs and elected MLAs, but not nominated members or MLCs.

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For a summit, connect forum, host or presidency, theme, membership status and principal initiative or declaration. Membership decisions may precede formal admission, so distinguish invitation, accession and full membership. Themes and outcomes belong to a particular edition and should be refreshed from the forum's official communique.

• India's G20 presidency theme used Vasudhaiva Kutumbakam: One Earth, One Family, One Future.
• SCO questions turn on observer status, the decision to admit and the later start of full membership.
• Global Biofuels Alliance promotes technology cooperation, policy coordination and wider clean-fuel adoption.
• For each summit, pair the host city or country with the declaration and any platform launched there.

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Track Tamil Nadu developments in four buckets: welfare schemes, education and skills, industrial or startup policy, and local infrastructure. For each item record department, target group, benefit, delivery channel, implementing agency and district or city. Budget allocations, beneficiary totals, deadlines and new projects must be refreshed from Finance or DIPR releases.

• Breakfast Scheme targets primary-school nutrition and attendance; Pudhumai Penn supports eligible girls in higher education.
• Naan Mudhalvan develops student and youth employability; Kalaignar Magalir Urimai supports eligible women household heads.
• Muthamizh Arignar Kalaignar medical insurance provides cashless treatment through empanelled hospitals.
• ODOP promotes a district's distinctive product through branding and market links; the village agriculture programme restores fallow land and water access.
• For infrastructure announcements, pair project, district or metropolitan area, implementing agency and official budget document.

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Tamil Nadu has a diversified economy spanning manufacturing, services and agriculture. Chennai anchors automobile and auto-component production, Tiruppur textiles, Coimbatore textiles and engineering, and TIDEL Park information technology. State institutions and social schemes combine industrial promotion with nutrition, health and women's participation.

• Chennai is called the Detroit of India for its automobile and auto-component cluster.
• SIPCOT promotes industrial parks and complexes; TIDEL Park symbolises Chennai's IT growth.
• Noon Meal Scheme supports school attendance and child nutrition.
• Dr Muthulakshmi Reddy Maternity Benefit Scheme supports pregnant women's nutrition and offsets wage loss.
• Self Help Groups promote saving, credit, livelihood activity and women's economic participation.

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Tamil resistance ranged from Palayakkarar opposition to Swadeshi enterprise and Gandhian civil disobedience. Veerapandiya Kattabomman of Panchalankurichi resisted Company revenue demands; V. O. Chidambaram Pillai challenged British shipping and supported workers; Rajaji led the 1930 Vedaranyam Salt March.

• V. O. C. founded the Swadeshi Steam Navigation Company in 1906 for the Tuticorin-Colombo route.
• V. O. C. supported the 1908 Coral Mill workers' strike in Tuticorin.
• C. Rajagopalachari led the Tiruchirappalli-to-Vedaranyam Salt Satyagraha in 1930.
• Subramania Bharati used poetry and journalism for independence, Tamil pride, women's emancipation and social reform.
• Periyar became the 'Vaikom Hero' for the struggle over oppressed communities' access to temple roads.

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Use speed = distance/time after putting units on one scale: m/s to km/h multiply by 18/5, and km/h to m/s multiply by 5/18. Average speed is total distance divided by total time, not the simple mean of speeds. For fixed distance, time varies inversely with speed.

• Train crossing pole: distance = train length; crossing platform: distance = train length + platform length.
• Relative speed adds for opposite directions and subtracts for the same direction.
• Boat: still-water speed = (downstream + upstream)/2; stream speed = (downstream - upstream)/2.
• Equal-distance average speed at speeds a and b is 2ab/(a+b).
• Work at equal rates uses worker-days: workers x days is constant.

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Roads provide flexible access, while railways move heavy, bulky goods cheaply over long land distances; waterways carry maritime trade and satellites transmit television, telecommunications and weather data. Strategic networks are tested through NH-44, the Golden Quadrilateral, Konkan Railway, Pamban bridge and Malacca Strait.

• NH-44, about 3,745 km from Srinagar to Kanyakumari, is India's longest National Highway.
• Golden Quadrilateral links Delhi, Mumbai, Chennai and Kolkata.
• Konkan Railway follows the western coastal belt; Pamban railway bridge links mainland Tamil Nadu to Rameswaram Island.
• Mumbai is a west-coast natural harbour; Kolkata port supports the Hooghly jute belt.
• Strait of Malacca, between Malaysia and Indonesia, is a crucial chokepoint for India's energy imports.

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The President is the constitutional Union executive, elected under Article 54 by elected MPs and elected state MLAs; the Prime Minister heads the Council of Ministers, which is collectively responsible to Lok Sabha under Article 75. The President appoints the Prime Minister, acts on ministerial advice, and may issue ordinances with the force of an Act while operative.

• The President resigns to the Vice-President; the Vice-President is ex officio Chairperson of Rajya Sabha.
• Article 72 gives the President pardon powers for courts martial, Union-law offences and death sentences.
• After the 44th Amendment, Article 352 Emergency requires the Cabinet's written advice; Emergency makes the system more unitary.
• The Attorney General is the Union's highest law officer.
• A presidential ordinance has the same force as a parliamentary law while it remains in operation.

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Early Rig Vedic society was pastoral and organised around the family or kula and the tribe or jana; Sabha and Samiti were assemblies, bali a voluntary offering to the chief, and gavishti a search or struggle for cattle. Later Vedic society became settled and agricultural as iron aided expansion into the Ganga plains and varna hardened.

• Rig Veda is the earliest Veda; Sama Veda contains chants for singing during sacrifice.
• Atharva Veda contains spells, charms, healing and rituals for everyday concerns.
• 'Satyameva Jayate' comes from the Mundaka Upanishad.
• Indra is called Purandara, destroyer of forts or cities.
• Later Vedic period, about 1000-600 BCE: settled agriculture, iron, Janapadas and a more rigid varna order.

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