142685
Streamline flow is more likely for liquids with
1 high density and low viscosity
2 low density and low viscosity
3 high density and high viscosity
4 low density and high viscosity
Explanation:
D $\operatorname{Re} \lt 2000\rightarrow$ streamline $\operatorname{Re}>4000 \rightarrow$ turbulent flow Reynolds number $\mathrm{R}=\frac{\mathrm{PvD}}{\eta}$ is directly proportional to the density and inversely proportional to the viscosity. For streamline flow, density should be low while viscosity should be high.
CG PET- 2008
Mechanical Properties of Fluids
142690
Spherical balls of radius $R$ are falling in a viscous fluid of viscosity $\eta$ with a velocity $v$. The retarding viscous force acting on the spherical ball is
1 directly proportional to $\mathrm{R}$ but inversely proportional $\mathrm{v}$
2 directly proportional to both radius $\mathrm{R}$ and velocity $\mathrm{v}$
3 inversely proportional to both radius $\mathrm{R}$ and velocity $\mathrm{v}$
4 inversely proportional to $\mathrm{R}$ but directly proportional to velocity $\mathrm{v}$
Explanation:
B According to stokes law, when a body falls through a fluid it drags the layer of the fluid in contact with it. A relative motion between the different layers of the fluid is set and as a result the body experience a retarding force. Falling of a raindrop and swinging of a pendulum bob are some common example. It is seen that the viscous force is proportional to the velocity as well as radius $\mathrm{R}$ of the object and is opposite to the direction of motion. $\therefore$ Retarding force $(\mathrm{F})=6 \pi \eta \mathrm{rv}$ Where, $\mathrm{r}=$ radius of ball $\mathrm{v}=$ velocity of ball $\eta=$ coefficient of viscosity of ball
JCECE-2008
Mechanical Properties of Fluids
142700
If the compressibility of water is $\sigma$ (sigma) per unit atmospheric pressure, then the decrease in volume $V$ due to $p$, atmospheric pressure will be
1 $\sigma \mathrm{V} / \mathrm{p}$
2 $\sigma \mathrm{pV}$
3 $\sigma / p \mathrm{~V}$
4 $\sigma p / V$
Explanation:
B We know, compressibility $\sigma=\frac{\Delta \mathrm{V} / \mathrm{V}}{\mathrm{p}}=\frac{\Delta \mathrm{V}}{\mathrm{pV}}$ or $\quad \Delta \mathrm{V}=\sigma \mathrm{pV}$
BCECE-2012
Mechanical Properties of Fluids
142708
The colloidal solution in which both the dispersed phase and dispersion medium are liquids are called :
1 emulsions
2 gels
3 foams
4 liquid crystals
Explanation:
A An emulsion is a type of colloid formed by combining liquids that normally don't mix. In an emulsion, one liquid contains a dispersion of the other liquid. Eg:- Egg yolk, Butter. The process of mixing liquids to form an emulsion is called emulsification.
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Mechanical Properties of Fluids
142685
Streamline flow is more likely for liquids with
1 high density and low viscosity
2 low density and low viscosity
3 high density and high viscosity
4 low density and high viscosity
Explanation:
D $\operatorname{Re} \lt 2000\rightarrow$ streamline $\operatorname{Re}>4000 \rightarrow$ turbulent flow Reynolds number $\mathrm{R}=\frac{\mathrm{PvD}}{\eta}$ is directly proportional to the density and inversely proportional to the viscosity. For streamline flow, density should be low while viscosity should be high.
CG PET- 2008
Mechanical Properties of Fluids
142690
Spherical balls of radius $R$ are falling in a viscous fluid of viscosity $\eta$ with a velocity $v$. The retarding viscous force acting on the spherical ball is
1 directly proportional to $\mathrm{R}$ but inversely proportional $\mathrm{v}$
2 directly proportional to both radius $\mathrm{R}$ and velocity $\mathrm{v}$
3 inversely proportional to both radius $\mathrm{R}$ and velocity $\mathrm{v}$
4 inversely proportional to $\mathrm{R}$ but directly proportional to velocity $\mathrm{v}$
Explanation:
B According to stokes law, when a body falls through a fluid it drags the layer of the fluid in contact with it. A relative motion between the different layers of the fluid is set and as a result the body experience a retarding force. Falling of a raindrop and swinging of a pendulum bob are some common example. It is seen that the viscous force is proportional to the velocity as well as radius $\mathrm{R}$ of the object and is opposite to the direction of motion. $\therefore$ Retarding force $(\mathrm{F})=6 \pi \eta \mathrm{rv}$ Where, $\mathrm{r}=$ radius of ball $\mathrm{v}=$ velocity of ball $\eta=$ coefficient of viscosity of ball
JCECE-2008
Mechanical Properties of Fluids
142700
If the compressibility of water is $\sigma$ (sigma) per unit atmospheric pressure, then the decrease in volume $V$ due to $p$, atmospheric pressure will be
1 $\sigma \mathrm{V} / \mathrm{p}$
2 $\sigma \mathrm{pV}$
3 $\sigma / p \mathrm{~V}$
4 $\sigma p / V$
Explanation:
B We know, compressibility $\sigma=\frac{\Delta \mathrm{V} / \mathrm{V}}{\mathrm{p}}=\frac{\Delta \mathrm{V}}{\mathrm{pV}}$ or $\quad \Delta \mathrm{V}=\sigma \mathrm{pV}$
BCECE-2012
Mechanical Properties of Fluids
142708
The colloidal solution in which both the dispersed phase and dispersion medium are liquids are called :
1 emulsions
2 gels
3 foams
4 liquid crystals
Explanation:
A An emulsion is a type of colloid formed by combining liquids that normally don't mix. In an emulsion, one liquid contains a dispersion of the other liquid. Eg:- Egg yolk, Butter. The process of mixing liquids to form an emulsion is called emulsification.
142685
Streamline flow is more likely for liquids with
1 high density and low viscosity
2 low density and low viscosity
3 high density and high viscosity
4 low density and high viscosity
Explanation:
D $\operatorname{Re} \lt 2000\rightarrow$ streamline $\operatorname{Re}>4000 \rightarrow$ turbulent flow Reynolds number $\mathrm{R}=\frac{\mathrm{PvD}}{\eta}$ is directly proportional to the density and inversely proportional to the viscosity. For streamline flow, density should be low while viscosity should be high.
CG PET- 2008
Mechanical Properties of Fluids
142690
Spherical balls of radius $R$ are falling in a viscous fluid of viscosity $\eta$ with a velocity $v$. The retarding viscous force acting on the spherical ball is
1 directly proportional to $\mathrm{R}$ but inversely proportional $\mathrm{v}$
2 directly proportional to both radius $\mathrm{R}$ and velocity $\mathrm{v}$
3 inversely proportional to both radius $\mathrm{R}$ and velocity $\mathrm{v}$
4 inversely proportional to $\mathrm{R}$ but directly proportional to velocity $\mathrm{v}$
Explanation:
B According to stokes law, when a body falls through a fluid it drags the layer of the fluid in contact with it. A relative motion between the different layers of the fluid is set and as a result the body experience a retarding force. Falling of a raindrop and swinging of a pendulum bob are some common example. It is seen that the viscous force is proportional to the velocity as well as radius $\mathrm{R}$ of the object and is opposite to the direction of motion. $\therefore$ Retarding force $(\mathrm{F})=6 \pi \eta \mathrm{rv}$ Where, $\mathrm{r}=$ radius of ball $\mathrm{v}=$ velocity of ball $\eta=$ coefficient of viscosity of ball
JCECE-2008
Mechanical Properties of Fluids
142700
If the compressibility of water is $\sigma$ (sigma) per unit atmospheric pressure, then the decrease in volume $V$ due to $p$, atmospheric pressure will be
1 $\sigma \mathrm{V} / \mathrm{p}$
2 $\sigma \mathrm{pV}$
3 $\sigma / p \mathrm{~V}$
4 $\sigma p / V$
Explanation:
B We know, compressibility $\sigma=\frac{\Delta \mathrm{V} / \mathrm{V}}{\mathrm{p}}=\frac{\Delta \mathrm{V}}{\mathrm{pV}}$ or $\quad \Delta \mathrm{V}=\sigma \mathrm{pV}$
BCECE-2012
Mechanical Properties of Fluids
142708
The colloidal solution in which both the dispersed phase and dispersion medium are liquids are called :
1 emulsions
2 gels
3 foams
4 liquid crystals
Explanation:
A An emulsion is a type of colloid formed by combining liquids that normally don't mix. In an emulsion, one liquid contains a dispersion of the other liquid. Eg:- Egg yolk, Butter. The process of mixing liquids to form an emulsion is called emulsification.
142685
Streamline flow is more likely for liquids with
1 high density and low viscosity
2 low density and low viscosity
3 high density and high viscosity
4 low density and high viscosity
Explanation:
D $\operatorname{Re} \lt 2000\rightarrow$ streamline $\operatorname{Re}>4000 \rightarrow$ turbulent flow Reynolds number $\mathrm{R}=\frac{\mathrm{PvD}}{\eta}$ is directly proportional to the density and inversely proportional to the viscosity. For streamline flow, density should be low while viscosity should be high.
CG PET- 2008
Mechanical Properties of Fluids
142690
Spherical balls of radius $R$ are falling in a viscous fluid of viscosity $\eta$ with a velocity $v$. The retarding viscous force acting on the spherical ball is
1 directly proportional to $\mathrm{R}$ but inversely proportional $\mathrm{v}$
2 directly proportional to both radius $\mathrm{R}$ and velocity $\mathrm{v}$
3 inversely proportional to both radius $\mathrm{R}$ and velocity $\mathrm{v}$
4 inversely proportional to $\mathrm{R}$ but directly proportional to velocity $\mathrm{v}$
Explanation:
B According to stokes law, when a body falls through a fluid it drags the layer of the fluid in contact with it. A relative motion between the different layers of the fluid is set and as a result the body experience a retarding force. Falling of a raindrop and swinging of a pendulum bob are some common example. It is seen that the viscous force is proportional to the velocity as well as radius $\mathrm{R}$ of the object and is opposite to the direction of motion. $\therefore$ Retarding force $(\mathrm{F})=6 \pi \eta \mathrm{rv}$ Where, $\mathrm{r}=$ radius of ball $\mathrm{v}=$ velocity of ball $\eta=$ coefficient of viscosity of ball
JCECE-2008
Mechanical Properties of Fluids
142700
If the compressibility of water is $\sigma$ (sigma) per unit atmospheric pressure, then the decrease in volume $V$ due to $p$, atmospheric pressure will be
1 $\sigma \mathrm{V} / \mathrm{p}$
2 $\sigma \mathrm{pV}$
3 $\sigma / p \mathrm{~V}$
4 $\sigma p / V$
Explanation:
B We know, compressibility $\sigma=\frac{\Delta \mathrm{V} / \mathrm{V}}{\mathrm{p}}=\frac{\Delta \mathrm{V}}{\mathrm{pV}}$ or $\quad \Delta \mathrm{V}=\sigma \mathrm{pV}$
BCECE-2012
Mechanical Properties of Fluids
142708
The colloidal solution in which both the dispersed phase and dispersion medium are liquids are called :
1 emulsions
2 gels
3 foams
4 liquid crystals
Explanation:
A An emulsion is a type of colloid formed by combining liquids that normally don't mix. In an emulsion, one liquid contains a dispersion of the other liquid. Eg:- Egg yolk, Butter. The process of mixing liquids to form an emulsion is called emulsification.