Advertisements
Advertisements
प्रश्न
Select the correct option.
Thrust acting perpendicularly on the unit surface area is called
विकल्प
pressure
moment of force
down thrust
none of these
Advertisements
उत्तर
pressure
APPEARS IN
संबंधित प्रश्न
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 weight of a body is more than the buoyant force experienced by it, due to a liquid. The body will
State whether thrust is a scalar or vector?
A tall vertical cylinder filled with water is kept on a horizontal table top. Two small holes A and B are made on the wall of the cylinder, A near the middle and B just Below the free surface of water. State and explain your observation.
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.
A piece of wood if left under water comes to the surface. Explain the reason.
A balloon filled with helium gas floats in a big closed jar which is connected to an evacuating pump. What will be your observation, if air from the jar is pumped out? Explain your answer.
Select the correct option:
The phenomenon due to which a solid experiences upward force when immersed in water is called:
In a fluid, buoyant force exists because the pressure at the ______ of an object is greater than the pressure at the top.
