A. Launched a new satellite
A.
B. Tested a ballistic missile
B.
C. Developed a stealth fighter aircraft
C.
D. Conducted ground testing of a scramjet engine for over 1,000 seconds
D.
Correct Answer: D
সঠিক উত্তর: D
Explanation
ব্যাখ্যা
In April 2025, the Defence Research and Development Organisation (DRDO) successfully completed a long-duration ground test of an Active Cooled Scramjet Subscale Combustor. The test, which lasted for over 1,000 seconds, is a major milestone in India's Hypersonic Cruise Missile Development Programme.