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प्रश्न
What is a submarine? How can it be made to dive in water and come to the surface of water?
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उत्तर
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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संबंधित प्रश्न
Equal volumes of the two different substances have equal masses.
Relative density of water is 1.0.
When a body is immersed in a liquid, the buoyant force experienced by the body is equal to the volume of the liquid displaced by it.
1 g cm-3 = ......... Kg m-3.
Match the following :
| Column A | Column B | ||
| (a) | kg `m^-3` | (i) | relative density |
| (b) | no unit | (ii) | sinks in alcohol |
| (c) | relative density | (iii) | floats on water |
| (d) | iron | (iv) | density |
| (e) | wood | (v) | density bottle |
A density bottle has a marking 25 ml on it. It means that:
The density of alcohol is 600 kg m-3. Express it in g Cm-3.
A piece of zinc of mass 438.6 g has a volume of 86 cm3. Calculate the density of zinc.
A piece of wood of mass 150 g has a volume of 200 Cm3. Find the density of wood in C.GS. unit and S.I. unit.
You are required to take out 200 ml of milk from a bucket full of milk. How will you do it?
