Mechanical Properties of Fluids

Compressibility of water is 5 × 10^-10 m²/N. The change in volume of 100 mL water subjected to 15 × 10⁶ Pa pressure will

• no change

• increase by 0.75 mL

• decrease by 0.75 mL

• increase by 1.50 mL

An adulterated sample of milk has a density of 1032 kgm^-3, while pure milk has a density of 1080 kgm^-3. Then the volume of pure milk in a sample of 10 L of adulterated milk is

• 0.5 L

• 1.0 L

• 4.0 L

• 3.0 L

Typical silt (hard mud) particle of radius 20 µm is on the top of lake water, its density is 2000 kg/m³  and the viscosity of lake water is 1.0 mPa, density is 1000 kg/m³. If the lake is still (hos no internal fluid motion). The terminal speed with which the particle hits the bottom of the lake is 

• 0.67 mm/s

• 0.77 mm/s

• 0.87 mm/s

• 0.97 mm/s

An air bubble is released from the bottom of a pond and is found to expand to thrice its original volume as it reached the surface. If the atmospheric pressure is 100 kPa, the absolute pressure at the bottom of lake in kPa is (assume no temperature variation):

• 33.3

• 50.0

• 300.0

• 200.0

Cathode rays are produced when the pressure is of the order of

• 2 cm of Hg

• 0.1 cm of Hg

• 0.01 mm of Hg

• 1 µm of Hg

A liquid wets a solid completely. The meniscus of the liquid in a sufficiently long tube is

• flat

• concave

• convex

• cylindrical

From the adjacent figure, the correct observation is

• the pressure on the bottom of tank A is greater than at the bottom of B

• the pressure on the bottom of the tank A is smaller than at the bottom of B

• the pressure depends on the shape of the container

• the pressure on the bottom of A and B is the same

If a liquid does not wet glass, its angle of contact is

• zero

• acute

• obtuse

• right angle

A rectangular vessel when full ofwater, takes 10 min to be emptied through an orifice in its bottom. How much time will it take to be emptied when half filled with water ?

• 9 min

• 7 min

• 5 min

• 3 min

If there were no gravity, which of the following will not be there for a fluid ?

• Viscosity

• Surface tension

• Pressure

• Archimedes' upward thrust