GK One-Liners

What: The Defence Research and Development Laboratory (DRDL), Hyderabad — part of the Defence Research and Development Organisation (DRDO) — successfully conducted a 1,000-second ground test of an Active Cooled Scramjet Subscale Combustor at its newly established Scramjet Connect Test Facility (SCPT), Hyderabad. This follows the earlier 120-second test conducted in January 2025 and marks a major step towards a full-scale flight-worthy combustor.

How: A scramjet (supersonic combustion ramjet) is an air-breathing engine with no moving parts that sustains supersonic combustion at airflow speeds exceeding 1.5 km/s. Unlike rockets, it uses atmospheric oxygen, making it more efficient at hypersonic speeds. The test directly supports India’s Hypersonic Cruise Missile (HCM) Development Programme, targeting speeds above Mach 5 (greater than 6,100 km/h). Active cooling is critical to withstand extreme thermal loads during sustained combustion.

Why: Hypersonic weapons are a top-priority theme in UPSC Prelims (Science & Tech / Defence) and CDS/NDA. Key recall: DRDL location (Hyderabad), Mach 5+ threshold, scramjet principle (supersonic combustion, no moving parts), test duration (1,000 seconds), and the January 2025 precedent. Only a handful of nations have demonstrated this capability.

What: The Indian Space Research Organisation (ISRO), Bengaluru, under the Department of Space (DoS), and the Sree Chitra Tirunal Institute for Medical Sciences and Technology (SCTIMST), Thiruvananthapuram, Kerala, under the Department of Science and Technology (DST), signed a Framework Memorandum of Understanding (MoU) on Space Medicine in Thiruvananthapuram. The agreement was signed by SCTIMST Director Dr. Sanjay Behari and ISRO Scientific Secretary M. Ganesh Pillai in the presence of ISRO Chairman Dr. V. Narayanan.

How: The MoU focuses on collaborative research in human physiology, behavioural health, biomedical support systems, and radiation biology as they apply to spaceflight environments. It directly supports the Gaganyaan human spaceflight programme — India’s first crewed orbital mission — by developing medical protocols and countermeasures for astronaut health during and after space travel.

Why: Gaganyaan and its associated institutional partnerships are heavily tested in UPSC Prelims (Science & Tech) and State PSC exams. Key recall: SCTIMST location (Thiruvananthapuram), parent ministry (DST), MoU focus areas (physiology, radiation biology), and ISRO Chairman (Dr. V. Narayanan). This also illustrates India’s growing space medicine infrastructure.

What: The Reserve Bank of India (RBI) imposed monetary penalties on three financial entities: (i) Indian Bank (Chennai) — Rs 1.61 crore for non-compliance with Interest Rate on Advances, the Kisan Credit Card (KCC) Scheme, and MSME lending norms; (ii) Indian Overseas Bank (IOB), Chennai — Rs 63.60 lakh for violations related to collateral-free agricultural loans and MSME lending; and (iii) Mahindra and Mahindra Financial Services Limited (MMFSL), Mumbai — Rs 71.30 lakh for non-compliance with Non-Banking Financial Company Systemically Important (NBFC SI) Directions 2016 and RBI KYC Directions 2016.

How: Penalties on scheduled commercial banks were imposed under Sections 47A(1)(c), 46(4)(i), and 51(1) of the Banking Regulation Act, 1949. The MMFSL penalty was levied under Sections 58G(1)(b) and 58B(5)(aa) of the Reserve Bank of India Act, 1934, reflecting the different regulatory framework applicable to NBFCs versus commercial banks.

Why: RBI penalty actions are a staple of Banking exam current affairs. Key recall: penalty amounts per entity, violation categories (KCC, MSME, KYC, NBFC SI), and the dual legislative framework (Banking Regulation Act 1949 for banks vs RBI Act 1934 for NBFCs). Indian Bank and IOB are both Chennai-headquartered public sector banks — a common location-trap in MCQs.

What: The Board of Reliance Industries Limited (RIL) — India’s largest private sector company, headquartered in Mumbai, established in 1957 — approved the appointment of Anant M. Ambani as Executive Director (ED) for five years from May 1, 2025, subject to shareholder approval. He becomes the first Ambani sibling to serve as ED at RIL. In FY25, RIL reported revenues of Rs 10,71,174 crore (+7.1%), Profit After Tax (PAT) of Rs 81,309 crore (+2.9%), and capital expenditure of Rs 1,31,107 crore.

How: RIL crossed Rs 10 lakh crore in total equity in FY25, becoming the first Indian company to achieve this milestone — it had earlier become the first Indian company to cross Rs 20 lakh crore in market capitalisation in 2024. Anant Ambani’s portfolio at RIL focuses on energy transition and sustainability, with a stated goal of achieving net-zero carbon emissions by 2035. He already serves on the boards of Jio Platforms Limited (JPL), Reliance Retail Ventures Limited (RRVL), and Reliance New Energy entities.

Why: Corporate milestones and key appointments at large Indian conglomerates are tested in SSC GK and Banking current affairs. Key recall: RIL CMD (Mukesh Ambani), FY25 revenue (Rs 10.71 lakh crore), equity milestone (first Indian co. at Rs 10 lakh crore), and Anant Ambani’s role focus (energy + sustainability, net-zero by 2035).

What: Dr. A. Jayathilak (IAS, 1991 batch, Kerala cadre) was appointed as the 50th Chief Secretary of Kerala, succeeding Sarada Muraleedharan (1990 batch) who retired on April 30, 2025. He will serve until his own retirement in June 2026. Prior to this appointment, he served as Additional Chief Secretary (Finance), Kerala.

How: Dr. Jayathilak’s career includes postings as District Collector of Kollam and Kozhikode, Managing Director of Industries and the Kerala Tourism Development Corporation (KTDC), Chairman of the Spice Board of India, and Additional Chief Secretary for Disaster Management. He also served on inter-cadre deputation in Chhattisgarh from 2002 to 2005.

Why: Senior IAS appointments are tested in State PSC exams (especially Kerala PSC) and UPSC current affairs. Key recall: batch year (1991), cadre (Kerala), predecessor (Sarada Muraleedharan, 1990 batch), ordinal rank (50th Chief Secretary), and his Spice Board chairmanship — a distinct MCQ hook. The 1990 vs 1991 batch distinction is a built-in exam trap.

What: A Hypersonic Cruise Missile (HCM) travels at speeds exceeding Mach 5 (approximately 6,100 km/h or 1.7 km/s), powered throughout its flight by an air-breathing scramjet engine — unlike ballistic missiles which follow a parabolic trajectory unpowered through most of their flight. India’s HCM development is led by DRDO’s Defence Research and Development Laboratory (DRDL), Hyderabad, and is at an advanced testing stage as of 2025.

How: The scramjet (Supersonic Combustion Ramjet) engine is the enabling technology. It compresses incoming air without moving parts, mixes it with fuel, and sustains combustion at supersonic airflow speeds exceeding 1.5 km/s. The key engineering challenge is active thermal management — the combustor must be cooled to survive sustained hypersonic flight. The SCPT (Scramjet Connect Test Facility) at Hyderabad is India’s dedicated ground test infrastructure for this purpose.

Why: Hypersonic weapons are a major theme in UPSC Mains (GS-III: Internal Security / Science & Tech) and CDS/NDA. India joins the US, Russia, and China as nations testing hypersonic propulsion. Key recall: Mach 5+ threshold, scramjet principle (no moving parts, supersonic combustion), DRDL location (Hyderabad), and the distinction between HCMs (air-breathing, sustained powered flight) and Hypersonic Glide Vehicles (HGVs) which are unpowered re-entry vehicles.