Viscosity

Statement (A): When the temperature increases the viscosity of gases increases and the viscosity of liquids decreases.

Statement (B): Water does not wet an oily glass because cohesive force of oil is less than that of water.

Statement (C) : A liquid will wet a surface of a solid if the angle of contact is greater than $90°$.

If $p$ is the density and $\eta$ is coefficient of viscosity of fluid which flows with a speed $v$ in the pipe of diameter $d$, the correct formula for Reynolds number $R_e$ is

 On increasing pressure, the viscosity of gas molecules _____ due to the increase in glow of molecules.

On increasing pressure viscosity of liquid molecules _____.

On increasing pressure viscosity of liquid molecules increases.

How does viscosity affect pressure drop?
 

How does pressure affect viscosity?
 

The volume of a liquid is proportional to given its density $\rho ,$ viscosity $\eta$ and $t$ the time of flow through a capillary tube of length $L$ and radius $R,$ with a pressure difference $P$ across its ends

The flow rate of water from a tap of diameter $1.25 \mathrm{cm}$ is $3$ litres per minute. If coefficient of viscosity of water is ${10}^{-3} \mathrm{Pa}.\mathrm{s},$ the nature of flow is ________

A layer of oil $1.5 \mathrm{mm}$ thick is placed between two microscope slides. A force of $5.5\times {10}^{-4} \mathrm{N}$ is required to glide one slide over the other at a speed of $1 \mathrm{cm} {\mathrm{s}}^{-1}$. If the coefficient of viscosity of the oil is $0.138 \mathrm{N} \mathrm{s} {\mathrm{m}}^{-2}$, then their contact area is _____.

The possible CGS units of coefficient of viscosity is 

Which of the following are the possible S.I. units of coefficient of viscosity?

On raising the temperature the viscosity of a gas :

The viscous force between two layers of a liquid acts:

If $\eta$ is the coefficient of viscosity of the liquid, $\nu$ speed of the layer , $\frac{v}{l}$ is strain rate and the viscous force of the liquid is $F$. Then the formula for contact area of the layers is 

Water from a pipe is coming at a rate of $100$ liters per minute. If the radius of the pipe is $5 \mathrm{c}\mathrm{m},$ the Reynolds number for the flow is of the order of: (density of water = $100 \mathrm{k}\mathrm{g}/{\mathrm{m}}^3,$ coefficient of viscosity of water $=1 \mathrm{m}\mathrm{P}\mathrm{a}\mathrm{ }\mathrm{s})$

Water from a pipe is coming at a rate of $100$ liters per minute. If the radius of the pipe is $5 \mathrm{c}\mathrm{m},$ the Reynolds number for the flow is of the order of: (density of water = $100 \mathrm{k}\mathrm{g}/{\mathrm{m}}^3,$ coefficient of viscosity of water $=1 \mathrm{m}\mathrm{P}\mathrm{a}\mathrm{ }\mathrm{s})$

The velocity of water in a river is $18 \mathrm{km} {\mathrm{h}}^{-1}$ near the surface. If the river is $5 \mathrm{m}$ deep, find the shearing stress between the horizontal layers of water. The coefficient of viscosity of water$={10}^{-2} \mathrm{poise}$.

When the temperature is increased, the viscosity of a liquid is 

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