GK One-Liners

What: India’s first satellite, Aryabhata, was launched on April 19, 1975 — making 2025 its Golden Jubilee year. It was launched aboard a Soviet Kosmos-3M rocket from Kapustin Yar launch site in the USSR, with technical support from the Soviet Union. Developed by ISRO under the guidance of Dr. Vikram Sarabhai and Prof. U.R. Rao, the satellite weighed 360 kg and had a distinctive 26-sided polyhedron shape with a diameter of 1.4 metres. It was powered by 46 watts from its 24 solar-cell-covered faces. India became the 11th country in the world to launch a satellite. The satellite re-entered Earth’s atmosphere on February 11, 1992. Its name was chosen by Prime Minister Indira Gandhi, after the ancient Indian astronomer-mathematician Aryabhata.

How: Aryabhata was designed to carry out experiments in X-ray astronomy, aeronomics (study of upper atmospheric phenomena), and solar physics. Although some experiments faced power failures early in the mission, the satellite demonstrated India’s capability to design and build a functional space payload — a critical step toward ISRO’s operational programmes. The mission was conceived under the INCOSPAR (Indian National Committee for Space Research) framework established by Dr. Vikram Sarabhai, which later evolved into ISRO (formally established August 15, 1969).

Why: Aryabhata and India’s space history are perennial UPSC GS-III (space programme, ISRO milestones) and Science & Technology GK questions. Key MCQ anchors: launch date (April 19, 1975), rocket (Kosmos-3M), launch site (Kapustin Yar, USSR), developers (Dr. Vikram Sarabhai + Prof. U.R. Rao), weight (360 kg), shape (26-sided polyhedron), power (46 W, 24 solar faces), India’s rank (11th country), re-entry (February 11, 1992), name chosen by (PM Indira Gandhi). The ’11th country’ and the 26-sided shape are exam-differentiating details often overlooked in revision.

What: The International Monetary Fund (IMF) released its April 2025 World Economic Outlook (WEO) titled ‘A Critical Juncture’, projecting India’s FY2025–26 GDP growth at 6.2% — a downward revision of 30 basis points from its earlier estimate of 6.5%. India’s FY2026–27 forecast is 6.3% (also revised down from 6.5%). The IMF projected India’s CPI inflation at 4.2% for FY26, current account deficit (CAD) at 0.9% of GDP, and unemployment at 4.9%. Globally, growth is projected at 2.8% for CY2025 and 3.0% for CY2026 — below the 2009–2019 average of 3.7%. The IMF is led by Managing Director Kristalina Georgieva and has 191 member countries, established in 1944.

How: The downward revision for India reflects spillover effects from US trade policy uncertainty — particularly the impact of tariffs on India’s export-oriented sectors. However, India remains the fastest-growing major economy globally. The global growth projection of 2.8% for 2025 represents a significant deterioration from the January 2025 forecast of 3.3%, driven by trade fragmentation, elevated interest rates in advanced economies, and geopolitical disruptions. The WEO title ‘A Critical Juncture’ reflects the IMF’s concern that policy missteps could tip the global economy into significantly weaker growth territory.

Why: IMF WEO projections — especially for India and the global economy — are among the most frequently tested data points in Banking (IBPS, RBI Grade B) and UPSC Prelims (Economy). Key facts: WEO title (‘A Critical Juncture’), India FY26 GDP (6.2%, ↓30 bps), FY27 (6.3%), India CPI FY26 (4.2%), CAD FY26 (0.9%), India unemployment (4.9%), global CY25 growth (2.8%), global CY26 growth (3.0%), comparison (below 2009–19 avg of 3.7%), IMF MD (Kristalina Georgieva), members (191), est. (1944). ‘A Critical Juncture’ as the WEO title and the 30 bps downward revision for India are the strongest MCQ hooks.

What: Sourav Kothari won the International Billiards and Snooker Federation (IBSF) World Billiards Championship 2025, defeating compatriot Pankaj Advani 725–480 points at the SBI Academy, Carlow, Ireland. His standout break of 325 points was a highlight of the final. Kothari is only the third Indian to have won both the IBSF World Billiards title and the World Billiards (Long Format) title. His victory came exactly 35 years after his father Manoj Kothari won the IBSF title in 1990 — a remarkable father-son legacy. India also claimed Bronze through Dhruv Sitwala and England’s David Causier.

How: Billiards at the world level is contested in two primary formats: the IBSF World Billiards Championship (Points format, governed by IBSF) and the World Billiards Championship (Long format, governed by the World Billiards and Snooker Council). Winning both is considered the complete achievement in cue sports. Pankaj Advani — the world’s most decorated cue sports player — has won the IBSF title multiple times, making Kothari’s defeat of him in the final particularly significant. The 35-year gap between Manoj Kothari’s 1990 title and Sourav’s 2025 win is one of the most compelling father-son sporting stories in Indian sports.

Why: Indian billiards champions — especially in IBSF competitions — are tested in Banking Sports GK and State PSC exams. Key facts: champion (Sourav Kothari), runner-up (Pankaj Advani), score (725–480), standout break (325 pts), venue (SBI Academy, Carlow, Ireland), distinction (3rd Indian to win both IBSF + WBL titles), father connection (Manoj Kothari won IBSF 1990, 35 years earlier), Bronze medals (Dhruv Sitwala + David Causier). The 35-year father-son gap and the ‘third Indian’ to complete the IBSF+WBL double are the most memorable exam anchors.

What: Klaus Schwab, founder of the World Economic Forum (WEF), announced his resignation. Schwab founded the WEF in 1971 and had led it for over five decades, making it the world’s foremost platform for public-private cooperation on global economic, social, and environmental issues. Peter Brabeck-Letmathe — former Chairman and CEO of Nestlé, and WEF Vice Chairman — was appointed as the interim Chairman of WEF. The WEF is headquartered in Cologny (near Geneva), Switzerland, and is best known for its annual Davos summit attended by global heads of state, CEOs, and international organisations.

How: Klaus Schwab established the WEF in January 1971 as the European Management Forum, initially focused on introducing US management practices to European companies. It adopted its current name in 1987 and expanded its mandate to address global governance challenges. Schwab is also credited with developing the concept of ‘stakeholder capitalism’ — the idea that companies should serve all stakeholders (employees, communities, environment) rather than just shareholders. Peter Brabeck-Letmathe, during his tenure at Nestlé (CEO 1997–2005, Chairman 2005–2017), was a prominent WEF participant and served as WEF Vice Chairman.

Why: WEF leadership changes and the Davos summit are tested in Banking and UPSC current affairs. Key facts: WEF founder (Klaus Schwab), founding year (1971, as European Management Forum), WEF renamed (1987), interim Chairman (Peter Brabeck-Letmathe), Brabeck’s background (ex-Chairman+CEO Nestlé, WEF Vice Chair), WEF HQ (Cologny/Geneva, Switzerland). Schwab’s founding year (1971) and the ‘stakeholder capitalism’ concept are frequently asked in management and economy sections. The WEF 2025 Young Global Leaders list — which included 7 Indians (covered in April 19 notes) — is a related cross-topic fact.

What: ISRO developed an indigenous ‘Stellite’ nozzle divergent (designated KC20WN) for the PSLV’s (Polar Satellite Launch Vehicle) PS4 upper stage, replacing the previously imported Columbium C103 nozzle from abroad. The new nozzle uses a Cobalt-based alloy containing Chromium (Cr), Nickel (Ni), Tungsten (W), and Iron (Fe). It withstands temperatures up to 1,150°C. The final hot-fire test ran for 665 seconds on April 8, 2025, at the ISRO Propulsion Complex (IPRC) in Mahendragiri, Tamil Nadu — following three earlier qualification tests. The indigenisation saves approximately 90% of the previous import cost.

How: The PS4 stage is the fourth and final stage of the PSLV, used for precise orbital injection of satellites. Nozzle divergents in rocket engines are the flared exit sections that accelerate exhaust gases to supersonic speeds — critical for thrust efficiency. The imported Columbium (Niobium) C103 alloy was previously the industry standard for high-temperature rocket nozzles. ISRO’s shift to a domestic Cobalt-based Stellite alloy — which offers comparable heat resistance at significantly lower cost — reflects the broader Atmanirbhar Bharat thrust in critical space hardware components.

Why: ISRO indigenisation milestones are tested in UPSC GS-III (space programme, technology self-reliance) and Science & Technology awareness. Key facts: component (Stellite KC20WN nozzle divergent for PSLV PS4), replaces (imported Columbium C103), alloy composition (Co-based: Cr, Ni, W, Fe), temperature rating (1,150°C), final test duration (665 seconds, April 8 2025), test facility (IPRC, Mahendragiri, Tamil Nadu), import cost saving (90%). The specific PSLV stage (PS4, the 4th stage) and the 90% import saving figure are the strongest MCQ anchors alongside the alloy substitution (Columbium → Cobalt-based Stellite).

What: World Book and Copyright Day is observed on April 23, established by UNESCO in 1995, with the first celebration held on April 23, 1996 in Barcelona, Spain. The World Book Capital for 2025 is Rio de Janeiro, Brazil. April 23 is also UN English Language Day (established 2010, commemorating William Shakespeare’s birth and death anniversary) and UN Spanish Language Day (established 2010, commemorating the death anniversary of Miguel de Cervantes). Spanish is the world’s 4th most spoken native language, with 560 million+ speakers across 21 countries.

How: The date April 23 was chosen by UNESCO because it coincides with the deaths of three literary giants in 1616: William Shakespeare (English), Miguel de Cervantes (Spanish), and Inca Garcilaso de la Vega (Peruvian). The World Book Capital designation is awarded annually by UNESCO to a city that proposes the most innovative programme for promoting books and reading. Rio de Janeiro’s selection as the 2025 World Book Capital follows its rich literary heritage and aligns with broader cultural diplomacy goals.

Why: World Book Day details — establishment year, first celebration city, and World Book Capital — are tested in Banking and SSC current affairs. Key MCQ anchors: date (April 23), established by UNESCO (1995), first celebration (April 23, 1996, Barcelona), World Book Capital 2025 (Rio de Janeiro, Brazil), UN English Language Day (April 23, Shakespeare), UN Spanish Language Day (April 23, Cervantes), Spanish speaker count (560 mn+, 21 countries, 4th most spoken native language). The 1996 Barcelona first-celebration detail and the triple literary death anniversary explanation for April 23 are UPSC-level differentiators.