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Question
What is a submarine? How can it be made to dive in water and come to the surface of water?
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Solution
SUBMARINE: Submarine is a water-tight boat which can travel underwater like a ship. It is provided with water tanks. When the submarine is to dive, water is filled in water tanks, it is made heavier and average density of submarine becomes greater than the density of seawater and it sinks. To make the submarine rise to the surface of the water, water tanks are emptied. This makes the average density of submarine becomes less than the density of seawater and it rises to surface.
While a submarine is underwater soldiers can see the enemy activities through the periscope.
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