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प्रश्न
Select the correct option:
When an object sinks in a liquid, its:
विकल्प
buoyant force is more than the weight of object
buoyant force is less than the weight of an object
buoyant force is equal to the weight of the object
none of the above
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उत्तर
buoyant force is less than the weight of object
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संबंधित प्रश्न
In which direction does the buoyant force on an object due to a liquid act ?
What is the scientific name of the 'upward force' acting on an object immersed in a liquid?
State whether pressure is a scalar or vector?
Explain why a gas bubble released at the bottom of a lake grows in size as it rises to the surface of the lake.
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 at a point inside the liquid is ...................... To its depth.
Two cylindrical vessels fitted with pistons A and B of area of cross-section 8 cm2 and 320 cm2 respectively are joined at their bottom by a tube and they are completely filled with water. When a mass of 4 kg is placed on piston A, Find:
- the pressure on piston A,
- the pressure on piston B, and
- the thrust on piston B.
You are provided with a hollow iron ball A of volume 15 cm3 and mass 12 g and a solid iron ball B of mass 12 g. Both are placed on the surface of water contained in a large tub.
- Find upthrust on each ball.
- Which ball will sink? Give a reason for your answer (Density of iron = 8.0 g cm-3)
Two spheres A and B, each of volume 100 cm3 is placed on water (density = 1.0 g cm−3). The sphere A is made of wood of density 0.3 g cm−3 and sphere B is made of iron of density 8.9 g cm−3.
- Find:
- The weight of each sphere, and
- The upthrust on each sphere.
- Which sphere will float? Give reason.
Complete the following sentence.
Mass = .................... × density
