Current Affairs Quiz - May 2025

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Under the Swachh Bharat Mission-Urban, Ghaziabad issued India’s first Certified Green Municipal Bond, raising ₹150 crore for a Tertiary Sewage Treatment Plant (TSTP). This bond marks a major shift towards sustainable urban infrastructure and financial innovation. The Tertiary Sewage Treatment Plant uses advanced Membrane Filtration Technologies like microfiltration, ultrafiltration, nanofiltration, and reverse osmosis (RO) to treat wastewater. The plant has a treatment capacity of 40 Million Litres per Day (MLD) and is linked to a 95 km pipeline network. It supplies treated water to over 1,400 industrial units, cutting dependence on freshwater sources.

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Researchers at the Institute of Nano Science and Technology (INST), Mohali, have found a new way to improve green hydrogen production. They created a special heterostructure using Copper Tungsten Oxide and Copper Oxide. This structure uses the Built-In Electric Field (BIEF) effect to boost the Hydrogen Evolution Reaction (HER). The Copper Tungsten Oxide nanoparticles are grown over a Cu(OH)₂ base, forming a p-n heterojunction with an uneven electronic setup. This BIEF helps in better proton adsorption and desorption. Green hydrogen, made from water using clean energy, is a pollution-free fuel of the future.

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International Labour Day, also called International Workers’ Day, is celebrated every year on May 1 to honour the hard work and contributions of workers across all sectors. The day highlights the need for fair wages, safe working conditions, and reasonable working hours for all employees. It also reminds us of the struggle of workers in history and the continued importance of protecting their rights. The International Labour Organization (ILO), a United Nations agency, plays a key role in setting global labour standards.

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Maharashtra has topped the CareEdge State Ranking Report 2025, released by CARE Ratings Ltd (CareEdge Ratings). This is the second edition of the CareEdge State Rankings. The rankings evaluate state performance across seven key pillars: economic performance, fiscal management, infrastructure development, financial sector growth, social development, governance quality, and environmental sustainability. The evaluation uses 50 measurable indicators. The primary aim is to provide a data-driven assessment of state performance. The rankings help identify strengths, gaps, and opportunities for policy improvement. This report offers valuable insights for improving state governance and development strategies.

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The European Red Admiral butterfly, scientifically called Vanessa atalanta, has been recorded for the first time in India near Dharamshala, Himachal Pradesh. This rare sighting was confirmed during a butterfly survey at Thatharna Hill in the Dhauladhar mountain range, at an altitude of 2,500 metres. The observation was verified by Himalayan butterfly expert Lovish Garlani from the Himachal Pradesh Forest Department. This raises the total number of butterfly species in Himachal Pradesh to 440, highlighting the region’s rich biodiversity. The species is known for long migrations across Europe and North America and was last seen in South Asia in 2022 in Pakistan after a 93-year gap. It has no confirmed records from China, Mongolia, or Afghanistan, making its presence in India a significant eastward range expansion.

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The government introduced the “Depot Darpan” portal and mobile app to monitor food storage depots in real time. Ministry of Consumer Affairs, Food & Public Distribution is responsible for launching the Depot Darpan portal. The initiative aims to ensure quality and safety in food grain storage for over 80 crore beneficiaries. Depot Darpan is part of a larger push for scientific warehousing and smart storage solutions. It will allow depot managers to track infrastructure, operational efficiency, and financial performance using geo-tagged data. The platform will provide automated ratings and insights for timely improvements. All data will be 100% validated by supervisory officers and random third-party audits.

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Global defence spending is rising fast due to uncertainty and rapid technology growth. As per Stockholm International Peace Research Institute (SIPRI), military expenditure reached $2.718 trillion in 2024, a 9.4% rise from 2023. China has the largest active military force with 2,035,000 personnel in 2025, according to Global Firepower. India ranks second with about 1,455,550 active personnel, showing strong defence strength and rising South Asian influence. The United States of America stands third with 1,328,000 troops, slightly reduced due to more focus on tech-based defence. Russia and Ukraine boosted troop numbers since 2022 due to ongoing conflict between them.

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Defence Research and Development Organisation (DRDO) and Indian Navy successfully carried out combat firing of the Multi-Influence Ground Mine (MIGM) with reduced explosives. MIGM is an advanced underwater naval mine developed by Naval Science and Technological Laboratory, Visakhapatnam, with support from other DRDO labs. It is designed to target stealth ships and submarines, enhancing the Indian Navy’s underwater combat strength. The mine has intelligent systems with ARM processor-based electronics that process sensor data in real time for precise defence action. Bharat Dynamics Limited and Apollo Microsystems Limited are the production partners. The system will strengthen India’s coastal defence and underwater deterrence.

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Scientists recently found signs of ancient wildfires, called palaeofires, from the Permian Period about 250 million years ago in the Godavari Basin. Palaeofires are wildfire events recorded in ancient rocks, helping us understand Earth’s past vegetation, climate changes, and coal formation. The study covered a long geological timescale, from the Late Silurian to the present Quaternary Period. Researchers used methods like Palynofacies analysis, Raman Spectroscopy, Rock-Eval Pyrolysis, and Fourier Transform Infrared (FTIR) Spectroscopy to study tiny fossils and charcoal. They clearly identified charcoal formed on-site (in situ) and transported charcoal (ex situ), solving a major geological debate. They also found that sea-level changes affected how fire residues were preserved—more intact during sea-level drops (regressive) and more scattered during sea-level rise (transgressive).

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A new study reveals that Indonesia’s Anak Krakatau volcano, which collapsed in 2018 causing a deadly tsunami, showed warning signs years in advance. Anak Krakatau, meaning “Child of Krakatoa,” is located in the Sunda Strait between Java and Sumatra in Indonesia. It is a stratovolcano, formed by alternating layers of solidified lava and ash. The volcano sits at the convergent boundary between the Indo-Australian and Eurasian tectonic plates. Anak Krakatau is part of the Pacific Ring of Fire, a seismically active zone around the Pacific Ocean. In December 2018, its southwest flank collapsed, generating a tsunami that killed over 400 people and caused widespread destruction.