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प्रश्न
What is meant by up thrust?
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उत्तर
The upward force which any liquid exerts upon a body placed in it is called the upthrust.
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संबंधित प्रश्न
What causes buoyant force (or upthrust) on a boat ?
An object of weight 200 N is floating in a liquid. What is the magnitude of buoyant force acting on it ?
What is a density bottle? How is it used to find the density of a liquid?
Distinguish between density and relative density.
Which of the following will sink or float on water? (Density of water = 1 g Cm-3)
body D having density 0.85 g m-3
Define the term thrust. State its S.I. unit.
The diagram below in Fig. 4.12 shows a device which makes the use of the principle of transmission of pressure.

- Name the parts labelled by the letters X and Y.
- Describe what happens to valves A and B and to the quantity of water in the two cylinders when the lever arm is moved down.
- Give reasons for what happens to valves A and B in part (ii).
- What happens when the release valve is opened?
- What happens to valve B in cylinder P when the lever arm is moved up?
- Give a reason for your answer in part (v).
- State one use of the above device.
Complete the following sentence :
Pressure is .................... in all directions about a point in a liquid.
The base of the cylindrical vessel measures 300 cm2. Water is poured into it up to a depth of 6 cm. Calculate the pressure of water on the base in the vessel.
Select the correct option:
When a body is wholly or partially immersed in a liquid, it experiences a buoyant force which is equal to:
