Reservations in public employment and education bypass absolute equality to create substantive equality (positive discrimination).

• Article 15(4): Enables special provisions for the advancement of Socially and Educationally Backward Classes (SEBCs), SCs, and STs.
• Article 15(5): Permits reservations in educational institutions, including private unaided institutions.
• Article 15(6): Enacted via the 103rd Amendment (2019), allowing up to 10% reservation for the Economically Weaker Sections (EWS) in educational institutions.
• Article 16(4): Empowers the State to make provisions for reservation in appointments or posts in favour of any backward class of citizens not adequately represented in the services.
• Article 16(4A): Allows reservation in matters of promotion with consequential seniority for SCs and STs.
• Article 16(6): Enables up to 10% reservation for EWS in public employment.
• Article 330 & 332: Mandates reservation of seats for SCs and STs in the Lok Sabha and State Legislative Assemblies respectively.
• Article 335: States that claims of SCs and STs shall be taken into consideration consistently with the maintenance of efficiency of administration.

Landmark Supreme Court Judgments

Types of Reservation

• Vertical Reservation: Social reservation earmarked for distinct social groups like SC, ST, OBC, and EWS. These cannot overlap; an individual can occupy a seat in only one vertical bucket.
• Horizontal Reservation: Interlocking reservation that cuts across vertical categories (e.g., quotas for Women, Persons with Benchmark Disabilities (PwBD), or Ex-servicemen). A horizontal quota beneficiary is adjusted within their respective vertical social category.

Facts

• Tamil Nadu Exception: Tamil Nadu implements a 69% reservation policy protected under the 9th Schedule of the Constitution (via the 76th Constitutional Amendment Act, 1994) to insulate it from judicial review.
• EWS Criteria: Families with an annual income below ₹8 Lakhs are eligible. It explicitly excludes individuals belonging to SC, ST, and OBC blocks.
• Creamy Layer Ceiling: The current income threshold to qualify as the "creamy layer" among OBCs stands at ₹8 Lakhs per annum.
• Nodal Ministry: The Ministry of Social Justice and Empowerment handles welfare and reservation guidelines for SC, ST, OBC, and EWS blocks, whereas the Department of Personnel and Training (DoPT) implements reservation quotas in Central Government jobs.

• Capital: Chennai (historically known as Madras).
• Governor : Rajendra Vishwanath Arlekar
• Chief Minister: C. Joseph Vijay
• Official Language: Tamil (the first language in India to be granted Classical Language status in 2004).
• Boundaries: Surrounded by Kerala (West), Karnataka (Northwest), Andhra Pradesh (North), and Puducherry UT. The coastline is called the Coromandel Coast.

State Symbols

• State Animal: Nilgiri Tahr (an endangered mountain ungulate endemic to the Western Ghats).
• State Bird: Emerald Dove.
• State Tree: Palmyra Palm Tree.
• State Flower: Gloriosa Lily (Gloriosa superba).
• State Emblem: Features the Hindu temple tower (Gopuram) modeled after the Srivilliputhur Temple.[

Geography & Landforms

• Highest Peak: Doddabetta Peak (2,637 metres), located in the Nilgiri Mountains.
• Major Mountain Ranges: Nilgiri Hills, Shevaroy Hills, Palani Hills, Cardamom Hills, and Anaimalai Hills.
• Important Rivers: Cauvery (Kaveri) (lifeline of the state), Palar, Ponnaiyar, Vaigai, and Thamirabarani.
• Major Lakes: Pulicat Lake (shared with Andhra Pradesh), Kodaikanal Lake, and Veeranam Lake.

Culture, Art & Festivals

• Classical Dance: Bharatanatyam (one of the oldest classical dance forms of India, originating from the temples of Tamil Nadu).
• Major Festival: Pongal (four-day harvest festival celebrated in January), Thaipusam, Karthigai Deepam, and Natyanjali Festival.
• Traditional Sport: Jallikattu (bull-taming sport traditional to Pongal celebrations).
• Biosphere Reserve: The Gulf of Mannar Biosphere Reserve is the first marine biosphere reserve in South and Southeast Asia.
• Nuclear Power Plants: Kudankulam Nuclear Power Plant (highest capacity in India) and Kalpakkam (Madras Atomic Power Station).
• Major Ports: Chennai Port, Ennore Port (Kamarajar Port), and V.O. Chidambaranar Port (Tuticorin).

• Formed: in 1956 as Mysore State and in 1973 renamed as Karnataka
• Capital: Bengaluru
• Governor: Thawar Chand Gehlot
• Festivals: Kambla – Buffalo race, Ugadi, Hampi festival, Vairamudi Brahmotsava, Tulu Sankramma, Gowri, Karaga

• National Park: Bandipur NP, Anshi NP,
• Kudermukh NP, Nagarahole NP, Bannerghatta NP, Mudumalai NP
• Lakes: Ulsoor Lake, Kukkarahalli Lake, Jaraganahalli Lake
• Waterfalls: Jog, Gokak, Shivanasamudra Fall

• Dances: Yakshagana, Nagamandala, Kunitha, Krishna Parijatha, Bhootha Aradhane
• Hill Stations: Chikmagalur, Brahmagiri, Kodachadri, Nandi Hills, Kemmangundi, Madikeri, Nandi hills
• Tribes: Barda, Bavacha, Chodhara, Dubla, Gowdalu, Irulina

• Date of Formation: 1st May 1960
• Chief Minister: Bhupendra Patel
• Governor: Acharya Devvrat
• Major Places: Rani Ki Vav, Somnath Temple, Lothal (Ahmedabad)
• Dholavira (Kutch)

• Festivals: Navratri, Kite festival, Kutch Utsav, Modhera dance festival
• Dance, Drama & Music forms: Dandiya Raas, Garba dance
• Tippani, Padhar Dance, Bhavi Folk drama, Hallisaka, Dangi Nrita

• Islands : Khadir, Pirotan, Nora, Bhaidar, Bet/Piram Bet, Shiyal Bet, Sadhu bet
• National Parks: Gir, Vansda, Black Buck, Marine National Park
• Biosphere reserve: Great runn of Kuch biosphere reserve

• Formation: 1 October 1953
• Capital: Amaravati
• Governor: S. Abdul Nazeer
• Chief Minister: N. Chandrababu Naidu
• Parliamentary Representation: 25 Lok Sabha seats and 11 Rajya Sabha seats
• Classical Dance: Kuchipudi
• Major Rivers: Godavari (Ganga of the South) and Krishna
• Leading Producer of: Mica
• Coastline: India's second-longest coastline (approximately 974 km), after Gujarat
• Major Lakes:

• • Kolleru Lake (freshwater, Ramsar Site)
  • Pulicat Lake (brackish water, home to Sriharikota Island)

• Visakhapatnam Steel Plant: India's first shore-based integrated steel plant
• Major Festivals: Ugadi (Telugu New Year), Sankranti, and Tirupati Brahmotsavam
• National Parks:

• • Papikonda National Park
  • Sri Venkateswara National Park
  • Rajiv Gandhi (Rameswaram) National Park

• Major Ports:

• • Visakhapatnam Port (India's deepest natural seaport)
  • Gangavaram Port

• Independence: July 4, 1776
• Capital: Washington, D.C.
• A federal republic of 50 states, founded in 1776 after declaring independence from Great Britain
• The Constitution, adopted in 1789, is the oldest written national constitution in use.
• Key Conflicts: American Revolutionary War (1775-1783), American Civil War (1861-1865, abolishing slavery).
• Key Leaders: George Washington (1st President), Abraham Lincoln (Civil War leader), Franklin D. Roosevelt (Great Depression/WWII).
• Lowest/Highest Points: Death Valley (86m below sea level) is the lowest; Denali (formerly Mount McKinley, 6,198m) is the highest.
• Major Mountain Ranges:

• • Rocky Mountains: Young, jagged mountains in the West.
  • Appalachian Mountains: Older, eroded mountains in the East.
  • Sierra Nevada & Cascades: Located along the Pacific coast.

• Major River Systems:

• • Mississippi-Missouri System: Combined, they form the 4th longest river system in the world.
  • Colorado River: Known for carving the Grand Canyon.
  • Rio Grande: Forms part of the border with Mexico.

The Great Lakes: Five interconnected freshwater lakes (Superior, Michigan, Huron, Erie, Ontario). Lake Superior is the world's largest freshwater lake by surface area.

• An intergovernmental organization of major emerging economies that serves as a leading platform for South-South cooperation.
• Coined by: The term "BRIC" was originally coined in 2001 by Goldman Sachs economist Jim O'Neill
• Formalization: The grouping was formalized in September 2006 during the UN General Assembly in New York
• First Summit: The first official BRIC Summit was held in Yekaterinburg, Russia, in 2009.
• Original Members: Brazil, Russia, India, China (joined 2006) and South Africa (joined 2010).
• Recent Joiners (2024-2025): Egypt, Ethiopia, Iran, and the United Arab Emirates (UAE) became full members on January 1, 2024. Indonesia officially joined as a full member on January 6, 2025.
• Partnership Status: In 2024, a new "partner country" category was created. Current partners include Belarus, Bolivia, Cuba, Kazakhstan, Malaysia, Nigeria, Thailand, Uganda, Uzbekistan, and Vietnam.
• 2025 Presidency: Brazil held the chairmanship with the theme "Strengthening Global South Cooperation for More Inclusive and Sustainable Governance".
• 2026 Presidency: India assumed the BRICS Chairmanship on January 1, 2026. India is hosting the 18th BRICS Summit.

New Development Bank (NDB)

• Headquarters: Shanghai, China.
• Objective: Mobilizing resources for infrastructure and sustainable development projects in BRICS and other emerging economies.
• Contingent Reserve Arrangement (CRA): A framework created to provide mutual support against short-term balance of payments pressures.

Established:

January 1, 2015 (via an Executive Resolution of the Union Cabinet)

Type: non-constitutional, non-statutory body

SDG Nodal Agency

Planning Horizon: 3-year Action Agenda, 7-year Strategy, 15-year Vision.

Structural Composition

Chairperson: The Prime Minister of India (Narendra Modi)

Vice-Chairperson: Ashok Kumar Lahiri

CEO: Ms. Nidhi Chhibber

Governing Council: Comprises the Prime Minister, Chief Ministers of all States, and Lieutenant Governors of Union Territories.

Major Reports/Indices: Releases the SDG India Index, State Health Index, Composite Water Management Index, and School Education Quality Index (SEQI).

Flagship Initiatives: Atal Innovation Mission (AIM), Aspirational Districts Programme

• Father of Indian Railways: Lord Dalhousie is credited for his "Railway Minutes" of 1853, which initiated the network.
• First Passenger Train: Ran on April 16, 1853, between Bori Bunder (Mumbai) and Thane (34 km).
  • Locomotives: Three steam engines named Sahib, Sindh, and Sultan.
  • Operator: Great Indian Peninsula Railway (GIPR).
• First Industrial Train: The Red Hill Railway (1837) in Madras was used to transport granite, predating the passenger service.
• First Electric Train: Started on February 3, 1925, between Bombay VT and Kurla on DC traction.
• Nationalization: 1951.
• Budget Merger: Since 1924, the Railway Budget was separate until it was merged with the Union Budget in 2017.

Chairman & CEO (Railway Board): Satish Kumar

First Female Chairperson: Jaya Varma Sinha

• Global Rank: Fourth largest railway network in the world (after US, China, and Russia).
• Zonal Structure: Divided into 18 administrative zones (including Metro Railway, Kolkata) and 68 divisions.
• Fastest Train: Vande Bharat Express (Indigenous semi-high speed).
• Longest Route: Vivek Express (Dibrugarh to Kanyakumari), covering ~4,234 km.
• World Heritage Sites (UNESCO): Four sites are recognized:
  • Darjeeling Himalayan Railway
  • Nilgiri Mountain Railway
  • Kalka-Shimla Railway
  • Chhatrapati Shivaji Maharaj Terminus (CSMT), Mumbai.
• Engineering Marvels:
  • Longest Platform: Gorakhpur (UP) at ~1,366 meters.
  • Highest Rail Bridge: Chenab Bridge (35m taller than the Eiffel Tower).

Milestones

• 1909: Introduction of toilets in trains (following a complaint letter by Okhil Chandra Sen).
• 1984: India’s first Metro started in Kolkata.
• 1986: First computerized reservation system launched in New Delhi.
• Mascot: Bholu, the Guard Elephant (introduced for the 150th anniversary in 2002).

• Full Form: Gujarat International Finance Tec-City.
• Location: Located on the banks of the Sabarmati River in Gandhinagar, Gujarat (connecting Ahmedabad and Gandhinagar).
• Type of Project: India's first operational greenfield Smart City and international financial services centre.
• Conceptualisation: Conceived in 2007; the development company (GIFTCL) was incorporated in 2009.
• Unified Regulator: IFSCA (International Financial Services Centres Authority).
• Establishment of Regulator: Established under the IFSCA Act, 2019, and became fully operational in April 2020.
• Headquarters of IFSCA: Gandhinagar, Gujarat.
• Key Function of IFSCA: It acts as a unified single-window regulator. It consolidates the financial powers previously distributed across domestic regulators like the RBI, SEBI, IRDAI, and PFRDA for transactions inside the IFSC

Major Strategic Firsts

• IIBX (India International Bullion Exchange): Launched as India's first-ever international bullion exchange. It allows qualified jewellers and banks to import gold and precious metals directly through the IFSC.
• India INX: India's first international stock exchange (a subsidiary of BSE), operational 22 hours a day.
• NSE IX: The international segment of the National Stock Exchange operating out of the IFSC.
• New Development Bank (NDB): The BRICS New Development Bank opened its first regional office in India at GIFT City.
• Smart Infrastructure: Features India's first unique urban infrastructure utilities, including a District Cooling System (DCS) for air conditioning, an Automated Vacuum Waste Collection system, and deep underground Utility Tunnels

Fiscal Incentives & Tax Rules

The Union Government uses specific tax exemptions to attract global corporations to the IFSC:

• Income Tax Holiday: 100% tax exemption for 10 consecutive years out of a 15-year block.
• Transaction Incentives: Complete exemption from STT (Securities Transaction Tax), CTT (Commodity Transaction Tax), and GST on offshore transactions executed via IFSC exchanges

Foundation

• Establishment Date: October 8, 1932 (Celebrated annually as Air Force Day).
• Official Motto: "Nabha Sparsham Deeptam" (Touch the Sky with Glory), taken from the eleventh chapter of the Bhagavad Gita.
• Global Ranking: Fourth-largest operational air force in the world (behind the US, Russia, and China).
• Supreme Commander: The President of India.

Leadership and Ranks

• First Chief of Air Staff: Air Marshal Sir Thomas Elmhirst (1947–1948).
• First Indian Chief of Air Staff: Air Marshal Subroto Mukherjee (1954–1960)—often hailed as the Father of the Indian Air Force.
• Only Marshal of the Air Force: Arjan Singh (awarded the five-star rank in 2002).
• Highest Commissioned Rank: Air Chief Marshal (Amar Preet Singh).

Key Historical & Operational Milestones

• Origin Name: Initially known as the Royal Indian Air Force (RIAF) before "Royal" was dropped in 1950.
• Operation Meghdoot (1984): Secured the Siachen Glacier; IAF provided vital transport and logistic support.
• Operation Safed Sagar (1999): IAF's crucial deployment during the Kargil War using air power at high altitudes.

• Establishment Date: 29 July 195
• Founder: Dwight D. Eisenhower (34th President of the United States)
• Headquarters: Washington, D.C.
• Official Head (Administrator): Jared Isaacma

Historic Milestones (Chronological Order)

1. Project Mercury (1958–1963): NASA’s first human spaceflight program designed to see if humans could survive in space. Alan Shepard became the first American in space (1961).
2. Apollo 11 (20 July 1969): The historic mission that landed the first humans on the Moon. Neil Armstrong became the first person to walk on the lunar surface, followed by Buzz Aldrin.
3. Pioneer 10 & 11 (1972/1973): First spacecraft to travel through the asteroid belt and visit Jupiter and Saturn.
4. Voyager 1 & Voyager 2 (1977): Deep-space probes sent to study the outer solar system. Voyager 1 is the farthest human-made object from Earth and the first to enter interstellar space.
5. Hubble Space Telescope (1990): One of the most famous optical space telescopes launched into Low Earth Orbit.

Latest & Ongoing NASA Missions

• Artemis Program: NASA's active program aiming to land the next humans—including the first woman and person of color—back on the Moon.
• James Webb Space Telescope (JWST): Launched in late 2021 as the successor to Hubble; it is the most powerful infrared space telescope ever built.
• NISAR (NASA-ISRO Synthetic Aperture Radar): A joint dual-frequency Earth-observing satellite radar mission developed collaboratively by NASA and India's ISRO.

• Founder(s): Bill Gates and Paul Allen
• Date of Foundation: April 4, 1975
• Headquarters: Redmond, Washington, United States
• Current CEO & Chairman: Satya Nadella (appointed CEO in 2014, Chairman in 2021)
• Previous CEOs: Bill Gates (1975–2000) and Steve Ballmer (2000–2014)
• Famous Products: Windows OS, Microsoft Office (Word, Excel, PowerPoint), Azure Cloud, and Xbox
• First Non-Founder CEO: Satya Nadella is the third CEO and the first who was not a co-founder or early pioneer.

• GMDP Origin: The Agni series was developed under the Integrated Guided Missile Development Programme (IGMDP).
• Conceived by Dr. A.P.J. Abdul Kalam in 1983.
• The "PATNA" Trick: A famous mnemonic to remember the 5 core missiles of IGMDP: Prithvi, Agni, Trishul, Nag, Akash.
• Strategic Role: Together with air-delivered weapons and submarine-launched K-series missiles, Agni completes India's Nuclear Triad.
• With the success of Agni-V, India entered the elite club of nations possessing ICBM capabilities, alongside the US, Russia, China, France, and the UK.

Facts

• Ballistic vs. Cruise: Agni is a ballistic missile. It follows an arched rocket-powered trajectory into space before gravity brings it down onto the target, unlike cruise missiles (e.g., BrahMos) which fly close to the ground using jet engines.
• Solid vs. Liquid Fuel: Legacy Indian missiles used liquid fuel, which takes time to prepare. Modern Agni variants feature solid-propellant engines, ensuring they are ready to launch instantly.
• Canisterization: Newer Agni variants (like Agni-P and Agni-V) use sealed canisters. This protects the missile from environmental wear, makes transportation easier by road or rail, and cuts down response launch times dramatically.
• MIRV Technology: The breakthrough Mission Divyastra flight test proved India's capability with Multiple Independently Targetable Re-entry Vehicles (MIRV). This enables a single Agni missile to split into multiple nuclear warheads mid-flight and strike entirely separate targets hundreds of kilometers apart.

Classification and Ranges