MEDIUM
Earn 100

The possible CGS units of coefficient of viscosity is
(a)
(b)
(c)Both and
(d)None of the above.

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Important Questions on Mechanical Properties of Fluids
EASY
The velocity of upper layer of water in a river is . Shearing stress between horizontal layers of water is . Depth of the river is _____ . (Co-efficient of viscosity of water is )

EASY
A flat plate of area is separated form a large plate by a layer of Glycerine thick. If the coefficient of viscosity of Glycerine is poise, the force required to keep the plate moving with a velocity of is

EASY
If is the density and is coefficient of viscosity of fluid which flows with a speed in the pipe of diameter , the correct formula for Reynolds number is

MEDIUM
Two capillary tubes of same length each of but of different radii and are connected in series. When water flows, the pressure difference between the ends of the arrangement is . Then the pressure difference between the ends of the first tube is

MEDIUM
A solid sphere of volume experiences a viscous force when descending with a speed in a liquid. If another solid sphere of volume descends with the same speed in the same liquid, it experiences a viscous force

HARD
Consider a thin square plate floating on a viscous liquid in a large tank. The height of the liquid in the tank is much less than the width of the tank. The floating plate is pulled horizontally with a constant velocity . Which of the following statements is (are) true?

EASY
Oil is used for frying food materials rather than water, since oil

MEDIUM
Which of the following option correctly describes the variation of the speed and acceleration 'a' of a point mass falling vertically in a viscous medium that applies a force , where 'k' is a constant, on the body? (Graphs are schematic and not drown to scale)

HARD
A steel ball is dropped in a viscous liquid. The distance of the steel ball from the top of the liquid is shown below. The terminal velocity of the ball is closest to

MEDIUM
The velocity of a small ball of mass and density , when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is , then the viscous force acting on the ball will be:

EASY
The relative viscosity of blood remains constant between

EASY
The velocity of water in a river is near the surface. If the river is deep, find the shearing stress between the horizontal layers of water. The coefficient of viscosity of water.

EASY
A metal block of base area is placed on a table, as shown in figure. A liquid film of thickness is inserted between the block and the table. The block is pushed by a horizontal force of and moves with a constant speed. If the viscosity of the liquid is , the speed of block is ______ .

MEDIUM
The velocity of water in a river is near the surface. If the river is deep, find the shearing stress between the horizontal layers of water. The coefficient of .

HARD
Two tubes of radii and and lengths and respectively, are connected in series and a liquid flows through each of them in stream line conditions. and are pressure differences across the two tubes. If is and is then the radius will be equal to :

MEDIUM
A solid sphere, of radius R acquires a terminal velocity when falling (due to gravity) through a viscous fluid having a coefficient of viscosity The sphere is broken into 27 identical solid spheres. If each of these spheres acquires a terminal velocity, when falling through the same fluid, the ratio equals:

MEDIUM
Eight drops of water, each of radius are falling through air at a terminal velocity of . If they coalesce to from a single drop, then the terminal velocity of combined drop will be:

EASY
Identify the incorrect statement regarding Reynold's number

HARD
Water from a pipe is coming at a rate of liters per minute. If the radius of the pipe is the Reynolds number for the flow is of the order of: (density of water = coefficient of viscosity of water

MEDIUM
If it takes 5 minutes to fill a 15 litre bucket from a water tap of diameter then the Reynolds number for the flow is (density of water = ) close to:

