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 Multiple Choice QuestionsMultiple Choice Questions

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11.

A 20 cm long capillary tube is dipped in water. The water rises up to 8 cm. If the entire arrangement is put in a freely falling elevator the length of water column in the capillary tube will be

  • 8 cm

  • 10 cm

  • 4 cm

  • 4 cm

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12.

Spherical balls of radius R are falling in a viscous fluid of viscosity η with a velocity v. The retarding viscous force acting on the spherical ball is

  • directly proportional to R but inversely proportional to v.

  • directly proportional to both radius R and velocity v.

  • inversely proportional to both radius R and velocity v.

  • inversely proportional to both radius R and velocity v.

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13.

If two soap bubbles of different radii are connected by a tube,

  • air flows from the bigger bubble to the smaller bubble till the sizes are interchanged.

  • air flows from bigger bubble to the smaller bubble till the sizes are interchanged

  • air flows from the smaller bubble to the bigger.

  • air flows from the smaller bubble to the bigger.

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14.

A capillary tube of radius 0.5 mm is immersed in a beaker of mercury. The level inside the tube is 0.8 cm below the level in beaker and angle of contact is 120°. What is the surface tension of mercury, if the mass density of mercury is ρ = 13.6 x103 kgm-3 and acceleration due to gravity is g = 10 m/s2 ?

  • 0.225 N/m

  • 0.544 N/m

  • 0.285 N/m

  • 0.375 N/m


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15.

If a capillary tube of radius r is immersed in a liquid, then the liquid rises to a height h. The corresponding mass of liquid column is m. The mass of water that would rise in another capillary tube of twice the radius is

  • 2 m

  • 5 m

  • 3 m

  • 4 m


16.

In a horizontal pipe of non-uniform cross-section, water flows with a velocity of 1 ms-1 at a point where the diameter of the pipe is 20 cm. The velocity of water (in ms-1) at a point where the diameter of the pipe is 5 cm is

  • 64

  • 24

  • 16

  • 32


17.

A spherical ball of diameter 1 cm and density 5 x 103 kg m-3 is dropped gently in a large tank containing viscous liquid of density 3 x103 kg m-3 and coefficient of viscosity 0.1 Ns m-2. The distance, the ball moves in 1 s after attaining terminal velocity is (g =10 ms-2)

  • 109 m

  • 23 m

  • 49 m

  • 45 m


18.

Two capillary tubes A and B of diameter 1 mm and 2 mm respectively are dipped vertically in a liquid. If the capillary rise in A is 6 cm, then the capillary rise in B is

  • 2 cm

  • 3 cm

  • 4 cm

  • 6 cm


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19.

After terminal velocity is reached, the acceleration of a body falling through a fluid is

  • equal to g

  • zero

  • less than g

  • greater than g


20.

A liquid is filled upto a height of 20 min a cylindrical vessel. The speed of liquid coming out of a small hole at the bottom of the vessel is (take, g = 10ms-2)

  • 1.2 ms-1

  • 1 ms-1

  • 2 ms-1

  • 3.2 ms-1


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