Mechanical Properties of Fluids

The term liquid crystal refers to a state that is intermediate between

• crystalline solid and amorphous liquid

• crystalline solid and vapour

• amorphous liquid and its vapour

• a crystal immersed in a liquid

Water rises in plant fibres due to

• capillarity

• viscosity

• fluid pressure

• osmosis

The cylindrical tube of a spray pump has a cross-section of 8 cm², one end of which has 40 fine holes each of area 10^-8 m². Ifthe liquid flows inside the tube with a speed of 0.15 m min^-1 the speed with which the liquid is ejected through the holes is

• 50 ms^-1

• 5 ms^-1

• 0.05 ms^-1

• 0.5 ms^-1

A body weighs 50 g in air and 40 g in water. How much would it weigh in a liquid of specific gravity 1.5 ?

• 30 g

• 35 g

• 65 g

• 45 g

Two solid pieces, one of steel and the other of aluminium when immersed completely in water have equal weights. When the solid pieces are weighed in air

• the weight of aluminium is half the weight of steel

• steel piece will weigh more

• they have the same weight

• aluminium piece will weigh more

The colloidal solution in which both the dispersed phase and dispersion medium are liquids are called

• emulsions

• gels

• foams

• liquid crystals

Horizontal tube of non-uniform corss-section has radii of 0.1 m and 0.05 m respectively at M and N. For a streamline flow ofl iquid the rate of liquid flow is

• changing continuously with time

• greater at M than at N

• greater at N than at M

• same at M and N

Three liquids of equal masses are taken in three identical cubical vessels A, B and C. Their densities are ρ_A, ρ_B and ρ_C respectively but ρ_A < ρ_B < ρ_C . The force exerted by the liquid on the base of the cubical vessel is

• maximum in vessel C

• minimum in vessel C

• the same in all the vessels

• maximum in vessel A

Water is in streamline flows along a horizontal pipe with non-uniform cross-section. At a point in the pipe where the area of cross-section is 10 cm², the velocity of wateris 1 ms^-1 and the pressure is 2000 Pa. The pressure at another point where the cross-sectional area is 5 cm² is

• 4000 Pa

• 2000 Pa

• 1000 Pa

• 500 Pa

Eight equal drops of water are falling through air with a steady velocity of 10 cm s^-1. If the drops combine to form a single drop big in size, then the terminal velocity of this big drop is

• 40 cms^-1

• 10 cms^-1

• 30 cms^-1

• 80 cms^-1