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The Force of Viscosity is - Physics

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प्रश्न

The force of viscosity is

विकल्प

  • electromagnetic

  • gravitational

  • nuclear

  • weak 

MCQ
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उत्तर

The force of viscosity arises from molecular interaction between different layers of fluids that are in motion. Molecular forces are electromagnetic in nature. Therefore, viscosity must also be electromagnetic.

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अध्याय 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
अध्याय 14 Some Mechanical Properties of Matter
MCQ | Q 24 | 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)


Explain why The size of the needle of a syringe controls flow rate better than the thumb pressure exerted by a doctor while administering an injection


(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


With an increase in temperature, the viscosity of liquid and gas, respectively will __________.


Define the coefficient of viscosity of a liquid.


What is Reynold’s number? Give its significance.


Define terminal velocity.


Write down the expression for Stoke’s force and explain the symbols involved in it.


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


From amongst the following curves, which one shows the variation of the velocity v with time t for a small-sized spherical body falling vertically in a long column of a viscous liquid.


Analogy

Viscous force: ______:: Buoyant force: ______.


Is viscosity a vector?


A solid ball of density ρ1 and radius r falls vertically through a liquid of density ρ2. Assume that the viscous force acting on the ball is F = krv, where k is a constant and v its velocity. What is the terminal velocity of the ball?


A spherical solid ball of volume V is made of a material of density ρ1. It is falling through a liquid of density ρ22 < ρ1). Assume that the liquid applies a viscous force on the ball that is proportional to the square of its speed v, i.e., `"F"_"viscous"`= -kv2 (k > 0). The terminal speed of the ball is ______.


Define the coefficient of viscosity.


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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