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
What happens to the buoyant force as more and more volume of a solid object is immersed in a liquid ? When does the buoyant force become maximum ?
A body sinks in a liquid A but floats in a liquid B. The density of liquid A is ....... than the density of liquid B.
A boy get into a floating boat.
What happens to the buoyant force on the boat ?
Write an expression for the pressure at a point inside a liquid. Explain the meaning of the symbols used.
In what direction and at what point does the buoyant force on a body due to a liquid act?
Prove that the loss in weight of a body when immersed wholly or partially in a liquid is equal to the buoyant force (or upthrust) and this loss is because of the difference in pressure exerted by liquid on the upper and lower surfaces of the submerged part of body.
What is meant by up thrust?
Is thrust a scalar or vector quantity?
Icebergs and ships stay afloat due to ______.
Salt water provides less buoyant force than freshwater.
