Physics - Mechanical Properties of Fluids

Question - 1

An ice block with relative density 0.9 floats in water (density=1.0 g/cc). A part of block is outside water level. When the ice block has completely melted, the water level will 

  • A rise
  • B fall
  • C remain same 
  • D it will depend on mass of block

Question - 2

A piece of iron has weight win air, w1 when immersed completely in water and w2 when immersed completely in a liquid. The relative density of liquid is 

  • A \(\frac { { w }_{ 1 }-{ w }_{ 2 } }{ w-{ w }_{ 1 } } \)
  • B \(\frac { { w }_{ 1 }-{ w }_{ 2 } }{ w-{ w }_{ 2 } } \)
  • C \(\frac { { w }-{ w }_{ 1 } }{ w-{ w }_{ 2 } } \)
  • D \(\frac { { w }-{ w }_{ 2 } }{ w-{ w }_{ 1 } } \)

Question - 3

In absence of gravity, which of the following will not be there for a fluid? 

  • A Viscosity
  • B Surface tension
  • C Pressure
  • D Archimedes' upwards thrust

Question - 4

A body is just floating in a liquid. Both have same densities (i.e., body and liquid). If body is slightly pressed down and then released it will 

  • A oscillate
  • B sink down
  • C come back to same position instantaneously
  • D come back to same position slowly

Question - 5

Along streamline, 

  • A the velocity of a fluid particle remains constant
  • B velocity of all fluid particles crossing a given position is constant.
  • C the velocity of all fluid particles at a given instant is constant
  • D the speed of a fluid particle remains constant

Question - 6

A liquid is allowed to flow into a tube of truncated cone shape. Identify the correct statement from the following.

  • A Speed is low at wider end
  • B Speed is high at narrow end
  • C Both (a) and (b) are correct
  • D None of the above 

Question - 7

An ideal fluid flows through a pipe of circular cross - section mad of two sections with diameters 2.5 cm and 3.75 cm. The ratio of velocities in the two pipes is 

  • A \(9:4\)
  • B \(3:2\)
  • C \(\sqrt { 3 } :\sqrt { 2 } \)
  • D \(\sqrt { 2 } :\sqrt { 3 } \)

Question - 8

A cylinder of radius ris filled with water upto a height h, so that thrust on the walls is equal to that on bottom, then it is equal to 

  • A \(\frac { R }{ 2 } \)
  • B \(R\)
  • C \(\frac { R }{ 3 } \)
  • D \(2R\)

Question - 9

A sphere of mass m falls through a viscous fluid with the terminal velocity v. Then, the terminal velocity of another sphere curved out of same material but mass 27 m is 

  • A 3v
  • B 6v
  • C 27v
  • D 9v

Question - 10

When a number of small droplets combine to form a large drop, then

  • A energy is released
  • B energy is absorbed
  • C cannot be predicted
  • D process does not involve any energy change
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