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Fluid

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Q.

A wooden block is floating in a liquid. About 50% of its volume is inside the liquid when the vessel is stationary. Percentage volume immersed when the vessel moves upwards with acceleration a = g/2 is :

Q.

Match Column 1 (Property at fluid) with Column 2.

(Law of fluid motion) and select the correct answer.

                                  

 

       Column 1

 

     Column 2

 (P)

 Volume rate of flow

  1.

 Bernoulli’s theorem

 (Q)

 Viscous drag

  2.

 Torricelli’s theorem

 (R)

 Speed of efflux (exit)

  3.

 Stoke’s law

 (S)

 Pressure difference  between two points

  4.

 Poisuilli’s law points in a  flow tube 

 

Q.

The vessel has two sections of areas of cross-section . A liquid of density fills both the sections, up to a height in each. Neglect atmospheric pressure.

 

           Column 1

 

          Column 2

 (P)

 The pressure at the base of  the vessel

  1.

  

 (Q)

 The force exerted by the  liquid on the base of vessel

  2.

  

 (R)

 The weight of the liquid is  less than

  3.

  

 (S)

 Download force on the l  iquid by the walls of the  vessel at the level X

  4.

  

 

Q.

MATCH THE FOLLOWING :

 

               Column 1

 

        Column 2

 (P)

Hydrostatic force on the side wall of the cubical vessel,  = density of liquid

                

 

1.

      

 (Q)

 Buoyant force on the cube,  =  density of liquid

 
 
            
 

2.

    

 (R)

             

 Impact (reaction) force on the  vessel by the liquid coming out of  the vessel,  = density of liquid

3.

    

 (S)

 Aerodynamic force acting on the f  lat roof surface of area A =  density of air

     

4.

  

 

 

Q. who has higher surface tension soap solution or water?

This is because plain tap water has higher surface tension, so the surface is "stronger" and can hold together a larger drop. Adding soap lowers the water's surface tension so the drop becomes weaker and breaks apart sooner.

Q. pressure kaun so quantity ha? Vector or scaler?

Pressure Scalar hai

Q. A drop of water of mass m = 0.4 g is placed between two clean glass plates, the distance between which is 0.01 cm. If the force needed to hold one of the plates is 3.2x N, find ‘x’. (Surface tension of water = 0.08 N/m).?

put force (F) = mg