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JEE Physics

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Chapter 27

Experiment - Coefficient Of Viscosity Of A Given Viscous Liquid By Measuring Terminal Velocity Of A Given Spherical Body. - all with Video Answers

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Chapter Questions

01:16

Problem 2811

The velocity of a small ball of mass $\mathrm{m}$ and density $\mathrm{d}_{1}$ when dropped in a container filled with glycerine becomes constants after sometime. What is the viscous force acting on the ball ? (density of glycerine is $\mathrm{d}_{2}$ )
(A) $m g\left\{1-\left(d_{1} / d_{2}\right)\right\}$
(B) $m g\left\{1-\left(d_{2} / d_{1}\right)\right\}$
(C) $m g\left\{d_{1} /\left(d_{1}-d_{2}\right)\right\}$
(D) $\operatorname{mg}\left\{\mathrm{d}_{2} /\left(\mathrm{d}_{1}-\mathrm{d}_{2}\right)\right\}$

Prem Bijarniya
Prem Bijarniya
Numerade Educator
01:43

Problem 2812

A boat of area $10 \mathrm{~m}^{2}$ floating on the surface of a river is made to move horizontally with a speed of $2 \mathrm{~ms}^{-1}$ by applying a tangential force. If the river is $1 \mathrm{~m}$ deep and the water in contact with the bed is stationary, what is the tangential force needed to keep the boat moving? (viscosity of water $0.01$ poise)
(A) $0.04 \mathrm{~N}$
(B) $0.05 \mathrm{~N}$
(C) $0.02 \mathrm{~N}$
(D) $0.03 \mathrm{~N}$

Prem Bijarniya
Prem Bijarniya
Numerade Educator
03:01

Problem 2813

A steel ball of diameter $3 \mathrm{~mm}$ falls through glycerine and covers a distance of $25 \mathrm{~cm}$ in $10 \mathrm{~S} .$ The specific gravity of steel and glycerine are $7.8$ and $1.26$ respectively. The viscosity of glycerine is about........ pascal-sec
(A) $1.3$
(B) $1.5$
(C) $0.8$
(D) $1.0$

Prem Bijarniya
Prem Bijarniya
Numerade Educator
02:06

Problem 2814

A steel ball of diameter $3.2 \mathrm{~mm}$ falls under gravity through an oil of density $920 \mathrm{~kg} \mathrm{~m}^{-3}$ and viscosity $1.64 \mathrm{Ns} \mathrm{m}^{-2}$. The density of steel. may be taken as $7820 \mathrm{~kg} \mathrm{~m}^{-3}$. What is the terminal velocity of the ball ?
(A) $3.45 \mathrm{cms}^{-1}$
(B) $4.25 \mathrm{cms}^{-1}$
(C) $1.85 \mathrm{~cm}^{-1}$
(D) $2.39 \mathrm{cms}^{-1}$

Prem Bijarniya
Prem Bijarniya
Numerade Educator
02:43

Problem 2815

64 equal drops of water are falling through air with a steady velocity $\mathrm{V}_{0}$, if the drops coalesce, what is their new velocity?
(A) $4 \mathrm{~V}_{0}$
(B) $2^{\{(-1) / 3\}} \mathrm{V}_{0}$
(C) $2 \mathrm{~V}_{0}$
(D) $2^{(1 / 3)} \mathrm{V}_{0}$

Prem Bijarniya
Prem Bijarniya
Numerade Educator
01:10

Problem 2816

The C.G.S. unit of coefficient of viscosity is poise and the SI unit is $\mathrm{Pa}-\mathrm{S}$. What is the relation between the two ?
(A) $1 \mathrm{~Pa}-\mathrm{s}=10^{3}$ poise
(B) $1 \mathrm{~Pa}-\mathrm{s}=10^{4}$ poise
(C) $1 \mathrm{~Pa}-\mathrm{s}=10$ poise
(D) $1 \mathrm{~Pa}-\mathrm{s}=100$ poise

Prem Bijarniya
Prem Bijarniya
Numerade Educator
01:48

Problem 2817

The terminal velocity of fall of lead shots in the cylindrical vessel is influenced by the nearness of the walls of the vessel. Hence the velocity in formula is divided by a factor $[1+\{(2.4 r) / R\}] .$ Where $r$ is the radius of the lead shots and $\mathrm{R}$ the radius of the vessel. This is called..........
(A) Ladenburg correction
(B) Velocity correction
(C) End-correction
(D) Rydberg correction

Prem Bijarniya
Prem Bijarniya
Numerade Educator
02:05

Problem 2818

A bubble of air $2 \mathrm{~mm}$ in diameter rises in a liquid of viscocity $0.075 \mathrm{SI}$ units and density $1350 \mathrm{~kg} \mathrm{~m}^{-3}$. The terminal velocity of the bubble is about......... $\mathrm{m} / \mathrm{s}$
(A) $4 \times 10^{-2}$
(B) $5 \times 10^{-2}$
(C) $2 \times 10^{-2}$
(D) $3 \times 10^{-2}$

Prem Bijarniya
Prem Bijarniya
Numerade Educator