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  • Question 1
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    The figure shows capillary tube of radius $$r$$ dipped into water. The atmospheric pressure is $$P_{0}$$ and the capillary rise of water is $$h. S$$ is the surface tension for water-glass.
    Initially, $$h = 10\ cm$$. If the capillary tube is now inclined at $$45^{\circ}$$, the length of water rising in the tube will be

  • Question 2
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    The figure shows capillary tube of radius $$r$$ dipped into water. The atmospheric pressure is $$P_{0}$$ and the capillary rise of water is $$h. s$$ is the surface tension for water-glass.
    The pressure inside water at the point $$A$$ (lowest point of the meniscus) is

  • Question 3
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    The incident intensity on a horizontal surface at sea level from the sun is about $$1 kW m^{-2}$$. Find the ratio of this pressure to atmospheric pressure $$p_0$$ (about $$1\times 10^5 Pa)$$ at sea level.
    [Assuming that $$50 %$$ % of this intensity is reflected and $$50 % $$ %  is absorbed]

  • Question 4
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    Mercury in a test tube forms ______ meniscus

  • Question 5
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    Directions For Questions

    Molecular forces exist between the molecules of a liquid in container. The molecules on the surface have unequal force leading to a tension on the surface. If this is not compensated by a force, the equilibrium of teh liquid will be a difficult task. This leads to an excess pressure on the surface. The nature of the meniscus can inform us of the direction of the excess pressure. The angle of contact of the liquid decided by the forces between the molecules, air and container can make the angle of contact.

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    The direction of the excess pressure in the meniscus of a liquid of angle of contact $$2\pi/3$$ is:

  • Question 6
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    A small ball (menu) falling under gravity in a viscous medium experiences a drag force proportional to the instantaneous speed u such that $$F_{drag}$$ = Ku. Then the terminal speed of the ball within the viscous medium is:

  • Question 7
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    There is a hole in the bottom of tank having water. If total pressure at bottom is 3 atm (1 atm = $$10^5 N/m^2$$) then the velocity of water flowing from hole is:

  • Question 8
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    A cylinder is filled with non-viscous liquid of density d to a height $$h_0$$ and a hole is made at a height $$h_1$$ from the bottom of the cylinder. The velocity of the liquid issuing out of the hole is:

  • Question 9
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    A spherical ball of iron of radius $$2\ \text{mm}$$ is falling through a column of glycerine. If densities of glycerine and iron are respectively $$1.3\times 10^3\ \text{kg/m}^3$$ and $$8\times 10^3\ \text{kg/m}^3$$. $$\eta\ {for \ glycerine} = 0.83\ \text{Nm}^{-2}\ \text{sec},$$ then the terminal velocity is:

  • Question 10
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    The rain drops falling from the sky neither injure us nor make holes on the ground because they move with:

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