Submarines — Set 3
Technology · पनडुब्बियां · Questions 21–30 of 40
What is the primary purpose of the 'Ballast Tanks' in a submarine?
Correct Answer: D. Controlling buoyancy
• **The** = The correct answer is 'Controlling buoyancy'. • **Data/Significance** — Ballast tanks are filled with water to make the submarine sink and filled with air to make it rise. • Wrong-option analysis: A Storing drinking water: related but different; B Storing fuel: related but different; C Housing the engine: related but different.
Which country launched the world's first nuclear-powered submarine, the USS Nautilus, in 1954?
Correct Answer: A. United States
• **The** = The correct answer is 'United States'. • **Data/Significance** — The USS Nautilus revolutionized naval warfare by using nuclear energy for propulsion. • Wrong-option analysis: B Soviet Union: incorrect type; C United Kingdom: incorrect type; D France: incorrect type.
What does the abbreviation 'SSBN' denote in naval classification?
Correct Answer: C. Ballistic Missile Submarine (Nuclear)
• **SSBNs** = SSBNs are nuclear-powered submarines designed to carry and launch long-range ballistic missiles. • **Data/Significance** — They serve as a key element of a nation's nuclear deterrent strategy due to their stealth. • Wrong-option analysis: A Super Stealth Boat Navy: related but different; B Small Ship Biological Network: related but different; D Support Submarine Base North: incorrect type.
Which device is used by a submarine to detect and locate objects underwater using sound pulses?
Correct Answer: D. Sonar
• **Sonar** = Sonar uses sound propagation to navigate or detect other vessels under the water surface. • **Data/Significance** — Since light and radio waves are absorbed quickly by water, sound is the most effective medium for detection. • Wrong-option analysis: A Radar: related but different; B Sextant: related but different; C Lidar: related but different.
Which Indian shipyard is responsible for building the Scorpène-class (Kalvari-class) submarines?
Correct Answer: A. Mazagon Dock Shipbuilders Limited
• **Mazagon** = Mazagon Dock Limited (MDL) in Mumbai built the Kalvari-class submarines under a transfer of technology from France. • **Data/Significance** — This project, known as Project 75, aimed to enhance India's domestic defense manufacturing. • Wrong-option analysis: B Cochin Shipyard: incorrect type; C Garden Reach Shipbuilders: incorrect type; D Hindustan Shipyard: incorrect type.
What is the name of India's first nuclear-powered submarine, which was taken on lease from Russia in 1988?
Correct Answer: C. INS Chakra
• **The** = The first INS Chakra was a Charlie-class nuclear submarine leased from the Soviet Union for training purposes. • **Data/Significance** — A second Akula-class submarine was later leased and given the same name in 2012.. • Wrong-option analysis: A INS Kalvari: related but different; B INS Arihant: related but different; D INS Sindhuvir: incorrect type.
Which part of the submarine acts as the 'brain', where navigation and combat decisions are made?
Correct Answer: D. The Control Room
• **The** = The control room houses the periscopes, sonar screens, and steering controls of the submarine. • **Data/Significance** — It is the central hub where the Commanding Officer manages the vessel's operations. • Wrong-option analysis: A The Engine Room: related but different; B The Torpedo Room: related but different; C The Ballast Tank: related but different.
What is the term for a submarine's ability to remain undetected by enemy sensors?
Correct Answer: A. Stealth
• **Stealth** = Stealth is achieved through quiet machinery, sound-absorbing tiles, and streamlined designs. • **Data/Significance** — It is the most critical survival factor for any submarine during military operations. • Wrong-option analysis: B Speed: incorrect type; C Endurance: incorrect type; D Buoyancy: incorrect type.
Which gas is removed from the submarine's atmosphere using 'scrubbers' to keep the air safe for the crew?
Correct Answer: C. Carbon Dioxide
• **Scrubbers** = Scrubbers use chemicals like soda lime or amine to absorb carbon dioxide from the air. • **Data/Significance** — Without this process, the buildup of CO2 would become toxic to the crew within hours. • Wrong-option analysis: A Oxygen: related but different; B Nitrogen: related but different; D Helium: incorrect type.
In which state is the Indian Navy's primary submarine base, INS Katyaboman, located?
Correct Answer: D. Tamil Nadu
• **INS** = INS Katyaboman is located in Tirunelveli, Tamil Nadu, and serves as a major VLF (Very Low Frequency) communication station. • **Data/Significance** — It is essential for communicating with submerged submarines across vast distances. • Wrong-option analysis: A Kerala: related but different; B Gujarat: related but different; C Maharashtra: related but different.