Question 1

What is the primary physical principle that allows a submarine to control its buoyancy and submerge in water?

Accepted Answer

Archimedes' Principle. Archimedes' Principle states that the upward buoyant force is equal to the weight of the fluid displaced. Submarines use ballast tanks to change their density and weight to submerge or float. This fundamental law governs the stability of all marine vessels.

Question 2

The first indigenous nuclear-powered ballistic missile submarine of India is named?

Accepted Answer

INS Arihant. INS Arihant was commissioned into the Indian Navy in 2016. It makes India one of the few countries to possess a nuclear triad capability. The name 'Arihant' translates to 'Slayer of Enemies' in Sanskrit.

Question 3

In submarine terminology, what does the acronym 'AIP' stand for?

Accepted Answer

Air-Independent Propulsion. Air-Independent Propulsion allows non-nuclear submarines to operate without access to atmospheric oxygen. This technology significantly increases the underwater endurance of conventional diesel-electric submarines. It enhances stealth by reducing the need to surface frequently to recharge batteries.

Question 4

Which type of submarine is primarily designed to destroy enemy merchant ships and other submarines?

Accepted Answer

SSN. SSN refers to nuclear-powered general-purpose attack submarines. Unlike ballistic missile submarines, their primary role is offensive combat and intelligence gathering. Their nuclear reactors allow for high speed and unlimited range.

Question 5

The process of a submarine using sound waves to navigate and detect other vessels is called?

Accepted Answer

Sonar. Sonar stands for Sound Navigation and Ranging. It is essential for underwater communication because radio waves do not travel well through deep water. There are two types: active sonar, which emits pulses, and passive sonar, which only listens.

Question 6

What component is used by a submarine to see objects on the surface while remaining submerged at a shallow depth?

Accepted Answer

Periscope. A periscope uses mirrors or prisms to allow the crew to observe the surface from underwater. Modern submarines often use optronic masts with high-resolution cameras instead of traditional optical tubes. This device is retractable to reduce drag and maintain stealth while submerge.

Question 7

India's Project 75 involves the construction of which class of diesel-electric attack submarines?

Accepted Answer

Kalvari Class. The Kalvari class is based on the French Scorpène-class design. Six of these submarines were planned to be built at Mazagon Dock Limited in Mumbai. They are known for their advanced stealth features and ability to launch torpedoes and missiles.

Question 8

The deepest point a submarine can safely descend to without the hull collapsing is known as its?

Accepted Answer

Crush Depth. Crush depth is the theoretical depth at which water pressure would cause the submarine's hull to fail. Designers usually set the maximum operating depth well above this limit for safety. High-strength steel or titanium is used in hull construction to resist such pressure.

Question 9

Which historical vessel is generally accepted as the first military submarine to be used in combat?

Accepted Answer

The Turtle. The Turtle was a hand-powered egg-shaped device used during the American Revolutionary War in 1776. It attempted to attach explosives to the hull of a British warship. Although the mission failed, it pioneered the concept of underwater warfare.

Question 10

Which country operated the 'Typhoon' class, recognized as the largest submarines ever built?

Accepted Answer

Soviet Union/Russia. The correct answer is 'Soviet Union/Russia'. The Typhoon class (Project 941 Akula) was designed to carry ballistic missiles during the Cold War. These giants are larger than many aircraft carriers and feature multiple inner hulls. One of these submarines was famously depicted in the novel 'The Hunt for Red October'.

Submarines — Set 1