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UPSC Prelims Solved Question Paper (Year Wise)
- UPSC Prelims 1979
- UPSC Prelims 1980
- UPSC Prelims 1981
- UPSC Prelims 1982
- UPSC Prelims 1983
- UPSC Prelims 1984
- UPSC Prelims 1985
- UPSC Prelims 1986
- UPSC Prelims 1987
- UPSC Prelims 1988
- UPSC Prelims 1989
- UPSC Prelims 1990
- UPSC Prelims 1991
- UPSC Prelims 1992
- UPSC Prelims 1993
- UPSC Prelims 1994
- UPSC Prelims 1995
- UPSC Prelims 1996
- UPSC Prelims 1997
- UPSC Prelims 1998
- UPSC Prelims 1999
- UPSC Prelims 2000
- UPSC Prelims 2001
- UPSC Prelims 2002
- UPSC Prelims 2003
- UPSC Prelims 2004
- UPSC Prelims 2005
- UPSC Prelims 2006
- UPSC Prelims 2007
- UPSC Prelims 2008
- UPSC Prelims 2009
- UPSC Prelims 2010
- UPSC Prelims 2011
- UPSC Prelims 2012
- UPSC Prelims 2013
- UPSC Prelims 2014
- UPSC Prelims 2015
- UPSC Prelims 2016
- UPSC Prelims 2017
- UPSC Prelims 2018
- UPSC Prelims 2019
- UPSC Prelims 2020
- UPSC Prelims 2021
- UPSC Prelims 2022
- UPSC Prelims 2023
- UPSC Prelims 2024
- UPSC Prelims 2025
UPSC Prelims Exam Solved Paper (Subject-wise)
Physical Geography
- Solar System
- Precipitation
- Rocks
- Soil Formation
- Alluvial Soil
- Laterite Soil
- Mountain Ranges in India
- Monsoon
- Western Disturbances
- Atmospheric Circulation
- Layers of Atmosphere
- Humidity
- Temperature and Pressure Belts
- Earth Interior
- Earthquake
- Volcano
- Latitude and Longitude
- Rotation and Revolution of Earth
- Cropping Pattern
- Ozone Layer
- Grass Lands
- Drainage System of India
- Green Revolution in India
- Oil Refineries in India
- Oceanography
- Plate Tectonics
- Fluvial Process
- Tide and Wave
- Desertification and Afforestation
- Forest and its Types
- Structure and Relief Features of India
- Distribution of Mineral Resources in India
Human Geography
Indian History
- Neolithic Period
- Harappa Civilization
- Vedic Era
- Mahajanpada
- Mauryan Era
- Buddhism
- King Kanishka
- Ajanta Caves
- Gupta Period
- Contribution of India in Mathematics and Science
- Scholars in Ancient India
- Cholas
- Vijayanagar Empire
- Battle of Tarain
- Foreign Invaders
- Chinese Travelers to India
- Delhi Sultanate
- Attack of Mohammad Ghazani
- Battle of Panipat
- Mughal Era
- Maratha Dominance
- Portuguese in India
- French in India
- East India Company
- Battle of Buxar
- Lord Cornwallis
- Social Movements in India
- Indian Renaissance
- Doctrine of Lapse
- Indian Economy During British Era
- British Administration and Administrative Reforms
- Revolt of 1857
- Ramakrishna Mission and Swami Vivekananda
- Princely States
- Bombay Association
- Indian National Congress
- Contribution of Gopal Krishna Gokhale
- Partition of Bengal
- Swadeshi Movement
- Surat Split
- Swaraj Party
- Ilbert Bill
- Rise of Gandhi
- Champaran Satyagraha
- Khilafat Movement
- Lucknow Session of INC
- Phase of Revolutionary Extremism in India
- Ghadar Party
- Contribution of Tilak
- Contribution of Khan Abdul Ghaffar Khan
- Home Rule Movement
- Theosophical Society
- Contribution of Maulana Abul Kalam Azad
- Subsidiary Alliance
- Indian Councils Act of 1909
- Government of India Act, 1919
- Rowlatt Act
- Jallianwalah Bagh Massacre
- Non-Co-operation Movement
- Chauri Chaura Incident
- Champaran Satyagrah
- Civil Disobedience Movement
- Round Table Conferences
- Contribution of B.R. Ambedkar
- Communal Award and Poona Pact
- Dandi March
- Muslim League and Demand of Separate Nation
- Cripps Mission
- Gandhi Irwin Talks
- Quit India Movement
- Wavell Plan
- Indian National Army
- Royal Indian Navy
- Interim Government
- C R Formula
- Independence of India
- India Post Independence
- Land Reforms in India
- Reorganization of Indian States
- History of Civil Services in India
Indian Polity
- Constituent Assembly
- Sources of Indian Constitution
- Preamble
- Citizenship
- Fundamental Right
- Fundamental Duties
- Directive Principles of State Policy
- President of India
- Vice-President of India
- Lok Sabha
- Rajya Sabha
- Speaker of Lok Sabha
- Joint Session of Houses
- Money Bill
- Amendment to the Constitution of India
- Schedule of Indian Constitution
- Eighth Schedule of Indian Constitution
- Amendment to the Constitution
- 42nd Constitution Amendment
- Kesavananda Bharati Case
- Election Commission of India
- Finance Commission of India
- Panchayati Raj
- Planning Commission of India
- Democracy
- High Court
- Supreme Court
- Judicial Writ
- Important Judgements of Supreme Court
- Centre State Relation
- Sarkaria Commission Report
- Federal Structure of India
- Types of Governance
- Union Cabinet
- Union Government
- Sarkaria Commission Report
- Attorney General
- UPSC
- National Anthem and Song
World Affairs
Science
Physics
- Unit and Dimension
- State of Matter
- Motion in Straight Line
- Circular Motion
- Gravitational Force
- Fluid Mechanics
- Light
- Sound
- Pendulum
- Electromagnetism
- Thermal Power Plant
- Hydroelectricity
- Nuclear Energy
- Space Science
- Mirror and Lens
- Electricity
- Radio Wave
- Communication System
- Emerging Technology
- Electromagnetic Wave
- Thermodynamics
Chemistry
Biology
- Human Body
- Human Brain
- Blood Group and Functions
- Human Eye
- Digestive System
- Reproduction System
- Vitamin and Minerals
- Life Cycle
- Disease and Vectors
- Horticulture
- Virus
- Photosynthesis
- Transpiration
- Genetic Engineering
- Food Preservation and Processing
- Cell and its Structure
Environment
Indian Economy
Art and Culture
Miscellaneous Topics
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Daily Current Affairs
Summary of NCERT Books
Recent Posts
Three Phase AC Circuits
Three-Phase Alternating Current (AC) circuits is the backbone of modern electrical power systems. They are widely used in generation, transmission, and distribution of electricity because of their efficiency, reliability, and ability to deliver constant power. In a three-phase system, three …
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