Important Questions of Mechanical Properties of Fluids Physics | Zigya

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221.

A body when fully immersed in a liquid of specific gravity 1.2 weighs 44 gwt. The same body when fully immersed in water weighs 50 gwt. The mass of the body is

  • 36 g

  • 48 g

  • 64 g

  • 80 g


222.

The wettability of a surface by a liquid depends primarily on

  • viscosity

  • surface tension

  • density

  • angle of contact between the surface and the liquid


223.

In the given (V-T) diagram, what is the relation between pressures p1 and p2 ?

           

  • p2 = p1

  • p2 > p1

  • p2 < p1

  • Cannot be predicted


224.

A small metal sphere of radius a is falling with a velocity v through a vertical column of a viscous liquid. If the coefficient of viscosity of the liquid is η, then the sphere encounters an opposing force of

  • 6πηa2v

  • 6ηvπa

  • 6πηav

  • πηv6a3


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225.

A drop of some liquid of volume 0.04 cmis placed on the surface of a glass slide. Then another glass slide is placed on it in such a way that the liquid forms a thin layer of area 20 cm2 between the surfaces of the two slides. To separate the slides a force of 16 x105 dyne has to be applied normal to the surfaces. The surface tension of the liquid is (in dyne-cm-1)

  • 60

  • 70

  • 80

  • 90


226.

To determine the composition of a bimetallic alloy, a sample is first weight in air and then in water. These weights are found to be w1 and w2 respectively. If the densities of the two constituents metals are ρ1 and ρ2 respectively, then the weight of the first metal in the sample is (where ρw is the density of water)

  • ρ1ρw ρ2 - ρ1 w1 ρ2 - ρw - w2ρ2

  • ρ1ρw ρ2 + ρ1 w1 ρ2 - ρw + w2ρ2

  • ρ1ρw ρ2 - ρ1 w1 ρ2 + ρw - w2ρ1

  • ρ1ρw ρ2 - ρ1 w1 ρ1 - ρw - w2ρ1


227.

A 20 cm long capillary tube is dipped vertically in water and the liquid rises upto 10 cm. If the entire system is kept in a freely falling platform, the length of the water column in the tube will be

  • 5 cm

  • 10 cm

  • 15 cm

  • 20 cm


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