Submarines — Set 4
Technology · पनडुब्बियां · Questions 31–40 of 40
What is the name of the second nuclear-powered ballistic missile submarine of India, commissioned in 2024?
Correct Answer: B. INS Arighat
INS Arighat is the second ship of the Arihant class and features significant technological upgrades over its predecessor. It was built at the Ship Building Centre in Visakhapatnam. This induction further strengthens India's nuclear deterrence and maritime defense.
The speed of a submarine is usually measured in which unit?
Correct Answer: B. Knots
The correct answer is 'Knots'. A 'knot' is a unit of speed equal to one nautical mile per hour. It is the standard unit used globally for maritime and aerial navigation. One knot is approximately 1.85 kilometers per hour.
Which German submarine type was famous for its 'Wolfpack' tactics during World War II?
Correct Answer: B. U-boat
U-boat is the anglicized version of the German word 'Unterseeboot'. These submarines were used to disrupt Allied supply lines by attacking in coordinated groups called wolfpacks. They had a major impact on the Battle of the Atlantic.
Which Indian submarine became the first to be gifted to a foreign country (Myanmar) in 2020?
Correct Answer: A. INS Sindhuvir
INS Sindhuvir was a Kilo-class submarine that was refurbished before being handed over to the Myanmar Navy. It was renamed UMS Minye Kyaw Htin by Myanmar. This move was part of India's 'SAGAR' policy to enhance regional maritime cooperation.
Which of the following is used to maintain a constant depth in a submarine without using the engine?
Correct Answer: B. Hydroplanes (Diving Planes)
Hydroplanes are wing-like structures that can be tilted to create upward or downward force as the submarine moves. They act like the elevators on an airplane's tail to control the pitch and depth. They are usually located on the bow or the sail of the vessel.
What is the name of the Indian Navy's museum in Visakhapatnam that is housed inside a real submarine?
Correct Answer: B. Kursura Submarine Museum
The INS Kursura (S20) was a Soviet-built Foxtrot-class submarine that served for 31 years. After decommissioning, it was preserved as a museum to showcase the life of submariners. It is one of the very few submarine museums in the world located on a beach.
Which country currently holds the record for the most active submarines in its naval fleet?
Correct Answer: B. China
While the USA has a more technologically advanced and all-nuclear fleet, China (PLAN) has the largest number of total submarine units. This includes a mix of diesel-electric and nuclear-powered vessels. Fleet sizes can change frequently based on new commissions and retirements.
The primary weapon used by submarines to attack surface ships or other submarines is the?
Correct Answer: A. Torpedo
A torpedo is a self-propelled underwater projectile with an explosive warhead. Modern torpedoes can be guided by wire or use their own sonar to find targets. They are launched from tubes located at the front (bow) or sometimes the rear of the submarine.
Which gas, if leaked from the batteries of a conventional submarine, can be extremely dangerous for the crew?
Correct Answer: B. Hydrogen
Charging lead-acid batteries produces hydrogen gas, which is highly flammable and explosive in enclosed spaces. Submarines have specialized sensors and ventilation systems to monitor and remove hydrogen safely. This is one of the primary safety concerns in conventional submarine operations.
In submarine operations, what is the meaning of the command 'Dive, Dive!'?
Correct Answer: B. Flood ballast tanks and submerge
This command initiates the process of moving from the surface to an underwater position. It involves opening vents to allow water into the ballast tanks and adjusting the hydroplanes. It is a critical procedure that requires perfect coordination among the crew.