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A flow of liquid is streamline, if the Reynold's number is

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Important Questions on Mechanical Properties of Fluids

MEDIUM
Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Critical Velocity and Reynolds Number
The velocity of water in a river is 18 km h-1 near the surface. If the river is 5 m deep, find the shearing stress between the horizontal layers of water. The coefficient of viscosity of water=10-2 poise.
EASY
Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Critical Velocity and Reynolds Number
Oil is used for frying food materials rather than water, since oil
EASY
Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Critical Velocity and Reynolds Number
The velocity of upper layer of water in a river is 36 km h-1. Shearing stress between horizontal layers of water is 10-3 N m-2. Depth of the river is _____ m. (Co-efficient of viscosity of water is 10-2 Pa s)
EASY
Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Critical Velocity and Reynolds Number
Two rain drops falling through air have radii in the ratio 1: 2. They will have terminal velocity in the ratio
HARD
Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Critical Velocity and Reynolds Number

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

 

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EASY
Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Critical Velocity and Reynolds Number
In an experiment to verify Stokes law, a small spherical ball of radius r and density ρ falls under gravity through a distance h in air before entering a tank of water. If the terminal velocity of the ball inside water is same as its velocity just before entering the water surface, then the value of h is proportional to: (ignore viscosity of air)
EASY
Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Critical Velocity and Reynolds Number
If p is the density and η is coefficient of viscosity of fluid which flows with a speed v in the pipe of diameter d, the correct formula for Reynolds number Re is
EASY
Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Critical Velocity and Reynolds Number
An air bubble of radius 1.0 cm rises with a constant speed of 3.5 mm s-1 through a liquid of density 1.75×103 kg m-3. Neglecting the density of air. the coefficient of viscosity of the liquid is _________ kgm-1 s-1
MEDIUM
Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Critical Velocity and Reynolds Number
The velocity of a small ball of mass M and density ρ, when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is ρ2, then the viscous force acting on the ball will be:
EASY
Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Critical Velocity and Reynolds Number
Identify the incorrect statement regarding Reynold's number Re:
MEDIUM
Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Critical Velocity and Reynolds Number
If it takes 5 minutes to fill a 15 litre bucket from a water tap of diameter 2π cm then the Reynolds number for the flow is (density of water = 103  kg/m3 and viscosity of water=10-3 Pa.s ) close to:
HARD
Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Critical Velocity and Reynolds Number
Water from a pipe is coming at a rate of 100 liters per minute. If the radius of the pipe is 5 cm, the Reynolds number for the flow is of the order of: (density of water = 100 kg/m3, coefficient of viscosity of water =1 mPa s)
EASY
Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Critical Velocity and Reynolds Number

A small spherical body of radius r and density ρ moves with the terminal velocity v in a fluid of coefficient of viscosity η and density σ. What will be the net force on the body?

EASY
Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Critical Velocity and Reynolds Number
Under a constant pressure head, the rate of flow of orderly volume flow of liquid through a capillary tube is V. if the length of the capillary is doubled and the diameter of the bore is halved, the rate of flow would become
EASY
Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Critical Velocity and Reynolds Number
The velocity of rain drop having radius 1 mm is 20 cm s-1. The velocity of raindrops of size 3 mm is
EASY
Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Critical Velocity and Reynolds Number
Two rain drops falling through air have radii in the ratio 1: 2. They will have terminal velocity in the ratio________
EASY
Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Critical Velocity and Reynolds Number
What is the terminal velocity of air bubble of 1.0 mm in diameter rising in liquid of viscosity 0.85 N-s m-2 and density 900 kg m-3 ?(air density 1.293 kg m-3, g=9 m s-2
EASY
Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Critical Velocity and Reynolds Number

A flat plate of area 10 cm2 is separated form a large plate by a layer of Glycerine 1 mm thick. If the coefficient of viscosity of Glycerine is 20 poise, the force required to keep the plate moving with a velocity of 1 cm s-1 is       
 

MEDIUM
Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Critical Velocity and Reynolds Number
A solid sphere of volume V experiences a viscous force F when descending with a speed v in a liquid. If another solid sphere of volume 27 V descends with the same speed v in the same liquid, it experiences a viscous force
EASY
Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Critical Velocity and Reynolds Number
The velocity of water in a river is 18 km h-1 near the surface. If the river is 5 m deep, find the shearing stress between the horizontal layers of water. The coefficient of viscosity of water=10-2 poise.