As the temperature of water increases, its viscosity
Remains unchanged
Decreases
Increases
Increases or decreases depending on the external pressure
(b)
A small spherical solid ball is dropped in a viscous liquid. Its journey in the liquid is best described in the figure drawn by:-
There is a $1\, mm$ thick layer of glycerine between a flat plate of area $100\, cm^2$ and a big plate. If the coefficient of viscosity of glycerine is $1.0\, kg\, (m-s)$, then ……. $N$ force is required to move the plate with a velocity of $7\, cm/s$ .
A small drop of water falls from rest through a large height $h$ in air; the final velocity is …………….
Small water droplets of radius $0.01 \mathrm{~mm}$ are formed in the upper atmosphere and falling with a terminal velocity of $10 \mathrm{~cm} / \mathrm{s}$. Due to condensation, if $8 \mathrm{such}$ droplets are coalesced and formed a larger drop, the new terminal velocity will be ……….. $\mathrm{cm} / \mathrm{s}$.
A thin square plate of side $2\ m$ is moving at the interface of two very viscous liquids of viscosities ${\eta _1} = 1$ poise and ${\eta _2} = 4$ poise respectively as shown in the figure. Assume a linear velocity distribution in each fluid. The liquids are contained between two fixed plates. $h_1 + h_2 = 3\ m$ . A force $F$ is required to move the square plate with uniform velocity $10\ m/s$ horizontally then the value of minimum applied force will be …….. $N$
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