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The Viscous Force Acting Between Two Layers of a Liquid is Given by F a = − η D V D Z . this F/A May Be Called - Physics

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प्रश्न

The viscous force acting between two layers of a liquid is given by \[\frac{F}{A} = - \eta\frac{dv}{dz}\]. This F/A may be called 

पर्याय

  •  pressure

  •  longitudinal stress

  •  tangential stress

  • volume stress

MCQ

उत्तर

The viscous force acts tangentially between two parallel layers of a liquid. In terms of force on a material, it is analogous to a shearing force.   

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पाठ 14: Some Mechanical Properties of Matter - MCQ [पृष्ठ २९९]

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एचसी वर्मा Concepts of Physics Vol. 1 [English] Class 11 and 12
पाठ 14 Some Mechanical Properties of Matter
MCQ | Q 25 | पृष्ठ २९९

संबंधित प्रश्‍न

Fill in the blanks using the word(s) from the list appended with each statement

Viscosity of gases. .. with temperature, whereas viscosity of liquids . . . with temperature (increases / decreases)


Fill in the blanks using the word(s) from the list appended with each statement

For solids with elastic modulus of rigidity, the shearing force is proportional to . . . , while for fluids it is proportional to . .. (shear strain / rate of shear strain)


(a) What is the largest average velocity of blood flow in an artery of radius 2 × 10–3 m if the flow must remain laminar? (b) What is the corresponding flow rate? (Take viscosity of blood to be 2.084 × 10–3 Pa s).


Estimate the speed of vertically falling raindrops from the following data. Radius of the drops = 0.02 cm, viscosity of air = 1.8 × 10−4 poise, g= 9.9 × 10 ms2 and density of water = 1000 kg m−3.


The unit of viscosity is


Which has greater viscosity, oil or honey? Why?


A small sphere of radius 2 cm falls from rest in a viscous liquid. Heat is produced due to viscous force. The rate of production of heat when the sphere attains its terminal velocity is proportional to


In a horizontal pipe of non-uniform cross-section, water flows with a velocity of 1 ms−1 at a point where the diameter of the pipe is 20 cm. The velocity of water (1.5 ms−1) at a point where the diameter of the pipe is (in cm)


Derive the expression for the terminal velocity of a sphere moving in a high viscous fluid using stokes force.


Derive Poiseuille’s formula for the volume of a liquid flowing per second through a pipe under streamlined flow.


A block of Ag of mass x kg hanging from a string is immersed in a liquid of relative density 0.72. If the relative density of Ag is 10 and tension in the string is 37.12 N then compute the mass of Ag block.


Choose the CORRECT statement.


With increase in temperature, the viscosity of ______.

  1. gases decreases.
  2. liquids increases.
  3. gases increases.
  4. liquids decreases.

An air bubble of negligible weight having radius r rises steadily through a solution of density σ at speed v. The coefficient of viscosity of the solution is given by ______.


An incompressible liquid is flowing through a uniform cross-sectional tube with a velocity 12 cm/ s. If the thickness of liquid layer is 0.8 cm, what is the velocity gradient of that flow of liquid?


The dimensions of coefficient of viscosity are ______.


A water pipe with diameter of 5.0 cm is connected to another pipe of diameter 2.5 cm. How would the speeds of the water flow compare?


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