Science & Technology Current Affairs MCQs

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A recent study in Nature Geoscience found that soil microbes, particularly fungi and bacteria, play a central role in regulating phosphorus availability and cycling over a span of 700,000 years in the Cooloola coastal dune system. These microbes manage the release and transformation of phosphorus in nutrient-poor soils, acting as crucial “gatekeepers” in ecosystem nutrient dynamics. These microbes adapt by replacing phospholipids with non-phosphorus lipids and storing fats to reduce phosphorus demand. They also improve phosphorus use efficiency in their metabolism to survive in low-phosphorus soils. Microbes both compete with plants for phosphorus and help them by recycling it and improving access.

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Denmark has inaugurated the world’s first large-scale commercial e-methanol facility in Kasso, southern Denmark. It has a production capacity of 42,000 metric tons (53 million litres) of e-methanol annually. E-methanol offers a viable path for reducing emissions in sectors like shipping and chemical manufacturing. E-methanol is produced by combining green hydrogen with captured carbon dioxide.

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A new species of ribbon worm called Pararosa vigarae was discovered off the coast of Galicia, Spain, in the Ría de Arosa estuary. It is nicknamed the “accordion worm” because it can contract its body into ring-like folds like an accordion’s bellows. The discovery was confirmed using both external features and molecular genetic analysis. The study was published in Royal Society Open Science on May 7, 2025. This worm is unique in its physical traits and behavior, adding to the biodiversity of the Nemertea phylum. Ribbon worms are predatory and venomous but have simple anatomy, making traditional classification difficult. Understanding marine biodiversity is crucial amid the current biodiversity crisis. Only about 1,350 ribbon worm species are known, but experts estimate 1,400 more may remain undiscovered. This highlights the need to protect marine habitats from environmental threats to conserve unknown species.

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Recently, the Defence Research and Development Organisation (DRDO) developed a high-pressure nanoporous multilayered polymeric membrane for seawater desalination. The project was carried out by Defence Materials Stores Research and Development Establishment (DMSRDE), Kanpur, under the Aatmanirbhar Bharat initiative. This membrane is made to suit the needs of the Indian Coast Guard (ICG), especially to resist chloride ion damage in salty seawater. It will be used on Offshore Patrol Vessels (OPVs) of the Coast Guard to ensure a self-reliant supply of freshwater onboard. Desalination means removing salts from seawater to make it usable for drinking or industry.

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The recent approval by the United States to sell AIM-120C-8 Advanced Medium-Range Air-to-Air Missiles (AMRAAMs) to Turkey has raised serious concerns in India due to changing regional security dynamics. AIM-120C-8 Advanced Medium-Range Air-to-Air Missile (AMRAAM) is a state-of-the-art missile with beyond-visual-range air-to-air missile (BVRAAM) and surface-to-air missile (SAM) capabilities. It is developed by Raytheon Technologies, a top US defence company. The missile is designed to engage and destroy enemy aircraft at long distances before visual contact is made. It is a key component in modern air combat systems and significantly boosts the air power of its users.

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The Department of Posts recently released a commemorative stamp to mark the 125th anniversary of the Kodaikanal Solar Observatory (KoSO). The Kodaikanal Solar Observatory was established in 1899 by the Indian Institute of Astrophysics (IIA) in Tamil Nadu. It was set up to study the Sun and its impact on Earth’s climate, particularly on the Indian monsoon. This decision followed the Great Drought of 1875–1877, which caused a massive famine that killed nearly 50 million people globally. The Famine Commission then recommended setting up a solar observatory to explore the link between solar activity and rainfall.

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The Indian Space Research Organisation (ISRO) launched the PSLV-C61 mission from Sriharikota to place the EOS-09 satellite into a Sun-synchronous polar orbit. The mission failed due to a problem in the third stage. PSLV stands for Polar Satellite Launch Vehicle, a four-stage rocket designed by ISRO. It mainly places satellites into Sun-synchronous polar orbits, ideal for Earth observation. The PSLV uses alternating solid and liquid propulsion stages for precision. The first stage uses HTPB-based solid fuel with six strap-on boosters in XL version, producing 4.8 MegaNewtons (MN) thrust. The second stage runs on liquid fuel, with the Vikas engine using Unsymmetrical Dimethylhydrazine (UDMH) and Nitrogen Tetroxide (N₂O₄), generating about 8 MN thrust. The third stage uses solid HTPB fuel again. The fourth stage has two liquid engines burning Monomethylhydrazine (MMH) and Mixed Oxides of Nitrogen (MON).

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In a recent development, India’s High-Altitude Platform (HAP) prototype designed by National Aerospace Laboratories (NAL) successfully completed pre-monsoon flight tests with a certified autopilot system. A High-Altitude Platform (HAP) is an unmanned, solar-powered aircraft that flies in the stratosphere at 17 to 22 kilometers altitude. It serves as a middle layer between ground systems and satellites for continuous aerial services. It was developed by NAL, Bengaluru, under the Council of Scientific and Industrial Research (CSIR). The Aeronautical Test Range (ATR) at Chitradurga, Karnataka supported its development. It is designed for border patrolling, surveillance in remote areas, and civil-military use. It can also act as a relay for telecommunications and weather monitoring.

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On May 19, 2025, the World Health Organization (WHO) honoured Austria, Norway, Oman, and Singapore for eliminating industrially produced trans fats from their national food supply. The announcement was made at the 78th World Health Assembly in Geneva, Switzerland. Trans fats, also called trans-fatty acids (TFA), are harmful unsaturated fats linked to over 278,000 deaths each year. WHO launched the global goal in 2018 to eliminate trans fats by 2025, but progress remains slow. By May 2025, 60 countries had adopted best-practice policies, covering only 46% of the global population. India implemented such a policy in 2022 through the Food Safety and Standards (Prohibition and Restrictions on Sales) Second Amendment Regulations, 2021. India is among the leading Asian countries in enforcing best-practice policies, alongside Thailand.

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The BrahMos-NG (Next Generation) missile is nearing flight testing with an extended range of 800 km. It is a smaller, lighter, and more versatile supersonic cruise missile. BrahMos-NG is designed to be used on fighter aircraft, ships, and submarines. It is jointly developed by India’s Defence Research and Development Organisation (DRDO) and Russia’s NPO Mashinostroyenia under BrahMos Aerospace. The missile aims to be miniaturized, stealthier, and more agile for ultra-precise strikes on land and sea targets.