Advertisements
Advertisements
प्रश्न
Higher Order Thinking Skill.
How does a fish manage to rise up and move down in water?
Advertisements
उत्तर
Fish has an internal swim bladder which is filled with gas. When it needs to rise or descend, it changes the volume and its density by filling this bladder with oxygen collected from the surrounding water through gills. When the bladder is filled with oxygen gas, the fish has a greater volume, with minimal increase in weight. When the bladder is expanded, it displaces more water and so experiences a greater force of buoyancy.
When the bladder is completely inflated, the fish has maximum volume and is pushed to the surface. When the bladder is completely deflated, the fish has minimum volume and sinks to the ocean floor.
APPEARS IN
संबंधित प्रश्न
The S.I. unit of density is ..........
When does an object float or sink when placed on the surface of a liquid ?
What is the unit of relative density?
Why does it happen?
A ship dips to a larger depth in fresh water as compared to marine water.
Why is the tip of an allpin made sharp?
A simple U tube contains mercury to the same level in both of its arms. If water is poured to a height of 13.6 cm in one arm, how much will be the rise in mercury level in the other arm?
Given : density of mercury = 13.6 x 103 kg m-3 and density of water = 103 kg m-3.
A body is held inside water contained in a vessel by tying it with a thread to the base of the vessel. Name the three forces that keep the body in equilibrium, and state the direction in which each force acts.
Is pressure a vector quantity?
Most buoyant objects are those with relatively ______.
- high volume
- higher mass
- low density
- less viscosity
The center of gravity of the floating body and the center of buoyance are in the same ______ line.
