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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.
Mass = density x .........
Density of water is .......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:
Describe an experiment to determine the density of a liquid.
The density of aluminium is 2.7 g cm3. Express it in kg m−3.
The mass of an empty density bottle is 30 g, it is 75 g when filled completely with water and 65 g when filled completely with a liquid. Find relative density of liquid.
The mass of 5 litre of water is 5 kg. Find the density of water in g cm-3.
