Advertisements
Advertisements
प्रश्न
Complete the following sentence :
A piece of wood is held under water. The upthrust on it will be ___________ the weight of the wood piece.
Advertisements
उत्तर
A piece of wood is held under water. The upthrust on it will be more than the weight of the wood piece.
APPEARS IN
संबंधित प्रश्न
Relative density of a substance is expressed in g cm-3.
If a fresh egg is put into a beaker filled with water, it sinks. On dissolving a lot of salt in the water, the egg begins to rise and then floats. Why ?
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.
Complete the following sentence :
Pressure of a liquid at a given depth is .................. To the density of the liquid.
The area of base of a cylindrical vessel is 300 cm2. Water (density= 1000 kg m-3) is poured into it up to a depth of 6 cm. Calculate : (a) the pressure and (b) the thrust of water on the base. (g = 10m s-2.
Describe an experiment to show that a body immersed in a liquid appears lighter than it really is.
Is thrust a scalar or vector quantity?
Most buoyant objects are those with relatively ______.
- high volume
- higher mass
- low density
- less viscosity
If the buoyant force is less, the object will float.
