# NCERT Physics Class 11 Exemplar Ch 10 Mechanical Properties of Fluids Part 3~ NCERT Physics Class 11 Exemplar Ch 10 Mechanical Properties of Fluids Part 3

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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