1. Delivery of ‘Himgiri’ by GRSE

• On July 31, 2025, Garden Reach Shipbuilders & Engineers (GRSE) delivered INS Himgiri, the first Nilgiri-class (Project 17A) frigate built by GRSE, to the Indian Navy. ([turn0search4], [turn0news22])

• This frigate is the 801st vessel produced by GRSE, including 112 warships—the highest by any Indian shipyard. ([turn0search4])

• Specifications: 149 meters long, 6,670 tonnes, and equipped with BrahMos cruise missiles, Barak-8 air defense, advanced AESA radar, CODOG propulsion, and a modern combat system. ([turn0search4], [turn0news20])

2. Launch of NISAR Satellite

• On July 30, 2025, India and the United States jointly launched the NASA–ISRO Synthetic Aperture Radar (NISAR) satellite aboard the GSLV-F16 from Sriharikota. ([turn0news19], [turn0search5])

• NISAR is the world’s first Earth imaging satellite to integrate dual-frequency SAR—NASA’s L-band and ISRO’s S-band—providing all-weather, day-night, high-resolution imaging with centimetre-scale precision. It supports applications in climate monitoring, disaster management, and land-ice change detection, revisiting each ground spot every 12 days. ([turn0search5], [turn0news19], [turn0news21])

Multiple-Choice Questions (MCQs)

Question 1:
Which shipyard delivered INS Himgiri, and on what date?
A) Mazagon Dock; July 30, 2025
B) Cochin Shipyard; August 1, 2025
C) GRSE; July 31, 2025
D) GRSE; July 25, 2025
Answer: C) GRSE; July 31, 2025
Explanation: GRSE delivered INS Himgiri on July 31, 2025, as confirmed by official sources. ([turn0search4])

Question 2:
How many total vessels has GRSE built, and how many are warships?
A) 801 total, 112 warships
B) 600 total, 50 warships
C) 801 total, 200 warships
D) 700 total, 112 warships
Answer: A) 801 total, 112 warships
Explanation: GRSE’s tally stands at 801 vessels, including 112 warships, the most by any Indian shipyard. ([turn0search4])

Question 3:
What are the key features of the INS Himgiri’s armament and systems?
A) Torpedo-only armament
B) BrahMos, Barak-8, AESA radar, CODOG system
C) Balloons for surveillance
D) Only surface-to-air missiles
Answer: B) BrahMos, Barak-8, AESA radar, CODOG system
Explanation: Himgiri is fitted with BrahMos cruise missiles, Barak-8 air defense, advanced AESA sensors, and a CODOG propulsion setup. ([turn0search4], [turn0news20])

Question 4:
When was the NISAR satellite launched, and what makes it unique?
A) July 30, 2025; dual-frequency radar imaging combining L- and S-band SAR
B) July 30, 2025; first satellite with thermal infrared sensors
C) August 1, 2025; India-only design
D) June 30, 2025; visible spectrum imaging
Answer: A) July 30, 2025; dual-frequency radar imaging combining L- and S-band SAR
Explanation: Launched on July 30, 2025, NISAR is the first satellite to use dual-frequency SAR—L-band by NASA and S-band by ISRO—for advanced Earth observation. ([turn0news19], [turn0search5])

Question 5:
What will be the primary application of the NISAR satellite?
A) Global telecommunications
B) Climate and disaster monitoring with centimeter-level accuracy
C) Maritime navigation only
D) Space astronomy
Answer: B) Climate and disaster monitoring with centimeter-level accuracy
Explanation: NISAR provides high-resolution radar data to monitor environmental changes, earthquakes, glacial shifts, and more, with cm-level precision. ([turn0news19], [turn0news21], [turn0search5])