GK One-Liners

What: Shaheed Diwas (Martyrs’ Day) is observed on 23 March to honour Bhagat Singh, Shivaram Rajguru, and Sukhdev Thapar, who were executed by the British colonial government at Lahore Central Jail on 23 March 1931. All three were members of the Hindustan Socialist Republican Association (HSRA), a revolutionary organisation seeking complete independence from British rule. A second Shaheed Diwas falls on 30 January, marking the assassination of Mahatma Gandhi in 1948.

How: The three revolutionaries were convicted in the Lahore Conspiracy Case, which arose from the killing of British police officer J.P. Saunders on 17 December 1928 — carried out to avenge the lathi-charge death of nationalist leader Lala Lajpat Rai. Their execution was reportedly pre-dated by one day to prevent the public protests expected on 24 March. Bhagat Singh was only 23 years old at the time of his execution, having been born on 26 September 1907 in Banga village, Lyallpur district, undivided Punjab. The three martyrs were cremated at Hussainiwala in Punjab, near the India-Pakistan border, where the National Martyrs’ Memorial now stands.

Why: This topic is high-yield for UPSC Prelims Modern History and GS-I. Examiners frequently test the HSRA’s ideological identity (socialist-republican, not just nationalist), the Lahore Conspiracy Case, the role of Lala Lajpat Rai, and the distinction between the two Shaheed Diwas dates. The Hussainiwala memorial location is a recurring factual anchor in state-level exams as well.

What: World Meteorological Day is observed annually on 23 March to mark the establishment of the World Meteorological Organization (WMO) on 23 March 1950. The WMO is a specialised agency of the United Nations focused on weather, climate, and water-related sciences. The 2026 theme is ‘Observing Today, Protecting Tomorrow’, emphasising the role of weather observation infrastructure in enabling early warnings and climate projections. The first World Meteorological Day was observed in 1961.

How: The WMO coordinates a global network of observation tools — including satellites, weather radars, ocean buoys, weather balloons, and surface weather stations — that generate the data underpinning weather forecasts, early warning systems, and long-term climate models. The 2026 statement was issued by WMO Secretary-General Prof. Celeste Saulo. Previous themes include 2025: ‘Closing the Early Warning Gap Together’ and 2024: ‘At the Frontline of Climate Action’.

Why: The WMO and its annual theme are standard Prelims targets in the Environment and International Organisations sections. Questions commonly test the WMO’s founding date, its UN specialised agency status, and its thematic focus. The observation tools listed are also relevant to GS-III (Disaster Management) in the context of early warning systems.

What: The 2026 Strait of Hormuz crisis was triggered by US-Israel coordinated airstrikes on Iran, codenamed ‘Operation Epic Fury’, on 28 February 2026. Iran retaliated by closing the Strait of Hormuz — a critical global energy chokepoint — through which approximately 60–70% of India’s Liquefied Petroleum Gas (LPG) imports and ~54% of its crude oil transit. Brent crude oil prices peaked at USD 126 per barrel, surpassing USD 100 on 8 March 2026 for the first time in four years, representing the largest energy supply disruption since the 1970s energy crisis. Iran’s Islamic Revolutionary Guard Corps (IRGC) confirmed the closure on 2 March 2026, with Chinese-owned and Muslim-operated vessels exempted from the blockade.

How: India’s domestic supply was protected through the Essential Commodities Act (ECA), 1955, under which a Natural Gas Control Order was issued on 9 March 2026. Authorities conducted 12,000+ raids and seized 15,000+ cylinders from hoarders. The International Energy Agency (IEA) approved an emergency release of 400 million barrels of strategic petroleum reserves on 11 March 2026 as a temporary measure. Union Minister Hardeep Singh Puri stated that approximately 70% of India’s energy sourcing now comes from non-Hormuz routes, reflecting a deliberate diversification strategy.

Why: Energy security through the Strait of Hormuz is a recurring GS-II (India’s Foreign Relations) and GS-III (Energy Security, Infrastructure) topic. The ECA, 1955 is a Prelims statute anchor. The IEA emergency reserve mechanism, India’s import dependence figures, and geopolitical chokepoints (Strait of Hormuz, Malacca Strait) are all high-yield for both Prelims and Mains.

What: Operation Sankalp is an Indian Navy mission to protect Indian-flagged and Indian-interest vessels in the Gulf of Oman and the Arabian Sea. It was originally launched on 19 June 2019 in response to rising tensions in the Gulf region and was reactivated in 2026 following the Strait of Hormuz closure. During the 2026 crisis, 23 Indian Navy warships were deployed, including escorts for LPG tankers Shivalik and Nanda Devi operated by the Shipping Corporation of India (SCI).

How: The operation functions as a maritime escort and surveillance mission: Indian warships shadow commercial vessels through high-risk corridors, maintain communication with maritime coordination centres, and deter hostile interception. The Navy coordinates with the Indian Coast Guard and the Ministry of Petroleum for real-time vessel tracking. SCI tankers carrying LPG were given priority escort given their direct link to domestic fuel supply.

Why: Naval operations in the Gulf are a recurring GS-III (Internal Security, Defence) and GS-II (India’s Foreign Relations) theme. Operation Sankalp specifically links India’s energy security to its naval power projection — a conceptual intersection that appears in Mains. The Shipping Corporation of India, as a Central Public Sector Enterprise (CPSE), is also a Prelims anchor for economy questions.

What: Jose Joseph Kattoor was appointed as the new Chairman of South Indian Bank with effect from 23 March 2026, for a three-year term. He succeeds V.J. Kurian in the role. Kattoor is a former Executive Director of the Reserve Bank of India (RBI), India’s central bank and banking sector regulator, bringing significant regulatory experience to the private-sector lender.

How: South Indian Bank is a scheduled commercial bank headquartered in Thrissur, Kerala. The appointment of a former RBI Executive Director as a private bank chairman reflects a common pathway where senior regulatory officials transition to leadership roles in the banking sector after superannuation or retirement. RBI Executive Directors sit one tier below Deputy Governors in the RBI’s hierarchy, overseeing key departments such as regulation, supervision, and foreign exchange management.

Why: Institutional appointments in the banking sector — particularly involving the RBI hierarchy — are high-frequency Prelims questions. Questions may test Kattoor’s background (former RBI ED), his bank (South Indian Bank), the tenure (three years), or the predecessor (V.J. Kurian). The RBI’s internal structure (Governor → Deputy Governors → Executive Directors) is itself a common Polity/Economy crossover topic.

What: Scientists discovered Ferric Hydroxysulfate, an iron sulfate mineral, near Mars’ Valles Marineris — the largest canyon system in the solar system. Ferric Hydroxysulfate forms only in the presence of liquid water and acidic conditions, making its presence strong evidence of ancient water activity on the Martian surface. Valles Marineris spans over 4,000 km in length and reaches depths of up to 7 km, earning it the nickname the ‘Grand Canyon of Mars’.

How: The mineral was identified through orbital spectrometry, a technique that analyses the wavelength of light reflected from planetary surfaces to determine their mineral composition. Iron sulfate minerals form through a process called sulfuric acid weathering, where sulfur dioxide emissions from volcanic activity react with iron-bearing rocks in the presence of water. This geological sequence points to a period when Mars had both volcanic activity and liquid surface water.

Why: Mars-related discoveries are a consistent Science & Technology section feature in UPSC Prelims, particularly in the context of space missions (ISRO’s Mangalyaan, NASA’s Perseverance) and astrobiology. The significance of water-forming minerals for the habitability question links this to broader Science GS-III themes. Key factual anchors: Valles Marineris dimensions (4,000+ km length, 7 km depth), mineral name (Ferric Hydroxysulfate), and the implication (ancient liquid water).