Understanding Submarines

What is the primary reason submarines are constructed differently from everyday objects?

• To withstand underwater pressure

• To enhance speed

• To increase visibility

• To improve buoyancy

What material is typically used to construct the pressure hull of a submarine?

• Wood

• Plastic

• High-strength steel or special alloys

• Aluminum

How do submarines control their depth in water?

• By adjusting their speed

• By using diving planes and ballast tanks

• By changing their shape

• By altering their color

What happens when a submarine's ballast tanks are filled with water?

• The submarine speeds up

• The submarine becomes stationary

• The submarine experiences negative buoyancy and dives

• The submarine rises to the surface

What is the main advantage of nuclear submarines over diesel-electric ones?

• They can remain submerged indefinitely

• They are smaller in size

• They are faster

• They are cheaper to operate

Why do diesel-electric submarines need to stay near the surface?

• To communicate with other vessels

• To charge their batteries using ambient air

• To avoid detection

• To maintain a stable temperature

What is the purpose of the periscope on a submarine?

• To communicate with other submarines

• To measure water temperature

• To detect underwater mines

• To visually assess surroundings while submerged

What is the function of the 'sails' on modern nuclear submarines?

• To increase speed

• To provide additional buoyancy

• To store food supplies

• To house communication equipment and sonar

How do submarines generate breathable oxygen?

• By using chemical oxygen generators

• By filtering air from the surface

• By storing large oxygen tanks

• By using solar panels

How do submarines produce drinkable water?

• By collecting rainwater

• By using chemical reactions

• By desalinating seawater using electricity

• By storing large water tanks