1) What is meant by the coefficient of viscosity?
The coefficient of viscosity is the tangential force essential to keeping a unit velocity gradient between two layers (of unit area).
2) What is fluid?
Fluid is a material that starts to flow when an external force is exerted on it.
3) Give two examples for fluids.
Gases and liquids.
4) What is meant by viscosity?
Viscosity is a property of fluids through which an internal frictional force is exerted while the fluid is in motion, and opposes the relative motion.
5) What is Stoke’s formula?
F=6πrηv,
Where r is the radius,
η is the fluid velocity,
v is the sphere velocity
6) What is Reynold’s number?
Rn=(ρVL)/μ,
Where ρ is the density,
V is the flow speed,
L is the linear dimension,
μ is the dynamic velocity
7) What is Newton’s equation for viscous force?
F= -ηA(dvx/dz)
8) Explain the unit poise.
The poise is the dynamic viscosity unit in the C.G.S system. The unit is named after Poiseuille, who did fundamental works on viscosity.
1 poise = 1 dynes second/cm2
9) Explain terminal velocity.
Terminal Velocity is the maximum constant velocity obtained by a body when falling independently in a viscous medium.
10) What happens to a liquid’s viscosity when the temperature rises?
Viscosity decreases when the temperature rises.
11) What happens to a liquid’s viscosity when pressure rises?
Viscosity increases when pressure rises (except in water).
12) What is the consequence of temperature on the viscosity of a liquid?
Viscosity drops with the rise in temperature.
13) What is the consequence of temperature on the viscosity of a gas?
The viscosity of a gas increases with the rise in temperature.
14) What is the aim of the viscosity experiment?
To find the coefficient of viscosity of a liquid by calculating the terminal velocity of a spherical body.
15) Which are the types of equipment needed for the viscosity experiment?
A half metre high, transparent viscous liquid, a 5cm wide cylindrical glass jar with millimetre graduations, one steel ball, a stopwatch, a screw gauge, a clamp with stand and a thermometer.
16) What is the dimension of viscosity?
ML-1T-1 is the dimension of viscosity.
17) What is the difference between the viscosities of water and blood?
Water is less viscous than blood.
18) Which property is defined as the resistance offered by liquid against its motion due to its internal friction?
Viscosity
19) Pascal-second is the unit of _____.
Viscosity
20) What are the two types of viscosity?
Dynamic viscosity and kinematic viscosity are the two types of viscosity.
Also Read:
- To determine the coefficient of viscosity of a given viscous liquid by measuring the terminal velocity of a given spherical body.
- Chapter Wise Physics Class 11 MCQs
- Physics Class 11 Practicals list
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