NCERT Physics Class 11 Exemplar Ch 10 Mechanical Properties of Fluids Part 3 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Q. 11 Is viscosity a vector?

Q. 12 Is surface tension a vector?

Q. 13 Iceberg floats in water with part of it submerged. What is the fraction of the volume of iceberg submerged if the density of ice is ?

Answer: Let the volume of the iceberg be . The weight of the iceberg is

. If is the fraction submerged, then the volume of water displaced is . The buoyant force is where is the density of water.

Q. 14 A vessel filled with water is kept on a weighing pan and the scale adjusted to zero. block of mass and density is suspended by a massless spring of spring constant k. This block is submerged inside into the water in the vessel. What is the reading of the scale?

Answer: Let x be the compression on the spring. As the block is in equilibrium

where is the density of water and V is the volume of the block. The

reading in the pan is the force applied by the water on the pan i.e.. ,

Since the scale has been adjusted to zero without the block, the new