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 correct answer is 'Controlling buoyancy'. Ballast tanks are filled with water to make the submarine sink and filled with air to make it rise. This process changes the overall density of the vessel relative to the surrounding water. It is the core mechanical system for vertical movement in the ocean.
Which country launched the world's first nuclear-powered submarine, the USS Nautilus, in 1954?
Correct Answer: A. United States
The correct answer is 'United States'. The USS Nautilus revolutionized naval warfare by using nuclear energy for propulsion. Unlike diesel-electric submarines, it did not need to surface to recharge batteries or run engines. It was also the first vessel to complete a submerged transit of the North Pole.
What does the abbreviation 'SSBN' denote in naval classification?
Correct Answer: C. Ballistic Missile Submarine (Nuclear)
SSBNs are nuclear-powered submarines designed to carry and launch long-range ballistic missiles. They serve as a key element of a nation's nuclear deterrent strategy due to their stealth. India's INS Arihant falls under this specific classification.
Which device is used by a submarine to detect and locate objects underwater using sound pulses?
Correct Answer: D. Sonar
Sonar uses sound propagation to navigate or detect other vessels under the water surface. Since light and radio waves are absorbed quickly by water, sound is the most effective medium for detection. Modern submarines use both active and passive sonar systems for comprehensive awareness.
Which Indian shipyard is responsible for building the Scorpène-class (Kalvari-class) submarines?
Correct Answer: A. Mazagon Dock Shipbuilders Limited
Mazagon Dock Limited (MDL) in Mumbai built the Kalvari-class submarines under a transfer of technology from France. This project, known as Project 75, aimed to enhance India's domestic defense manufacturing. MDL is one of India's oldest and most vital defense shipyards.
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 first INS Chakra was a Charlie-class nuclear submarine leased from the Soviet Union for training purposes. It helped the Indian Navy gain experience in operating nuclear-powered vessels. A second Akula-class submarine was later leased and given the same name in 2012.
Which part of the submarine acts as the 'brain', where navigation and combat decisions are made?
Correct Answer: D. The Control Room
The control room houses the periscopes, sonar screens, and steering controls of the submarine. It is the central hub where the Commanding Officer manages the vessel's operations. Highly trained personnel monitor all systems from this high-tech command center.
What is the term for a submarine's ability to remain undetected by enemy sensors?
Correct Answer: A. Stealth
Stealth is achieved through quiet machinery, sound-absorbing tiles, and streamlined designs. It is the most critical survival factor for any submarine during military operations. Reducing the 'acoustic signature' is a primary goal in modern submarine engineering.
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 use chemicals like soda lime or amine to absorb carbon dioxide from the air. Without this process, the buildup of CO2 would become toxic to the crew within hours. This system is a vital part of the submarine's complex life-support machinery.
In which state is the Indian Navy's primary submarine base, INS Katyaboman, located?
Correct Answer: D. Tamil Nadu
INS Katyaboman is located in Tirunelveli, Tamil Nadu, and serves as a major VLF (Very Low Frequency) communication station. It is essential for communicating with submerged submarines across vast distances. The base plays a strategic role in India's maritime security architecture.