143385
Water is flowing through a pipe of constant cross-section. At some point the pipe becomes narrow and the cross-section is halved. The speed of water is :
1 reduced to zero
2 decreased by factor of 2
3 increased by a factor of 2
4 unchanged
Explanation:
C Given, Area of pipe when becomes narrow $\left(\mathrm{A}_{2}\right)=\frac{\mathrm{A}_{1}}{2}$ From continuity equation, $\mathrm{A}_{1} \mathrm{~V}_{1} =\mathrm{A}_{2} \mathrm{~V}_{2}$ $\mathrm{~A}_{1} \mathrm{~V}_{1} =\mathrm{A}_{2} \mathrm{~V}_{2}$ $\mathrm{~A}_{1} \mathrm{~V}_{1} =\left(\frac{\mathrm{A}_{1}}{2}\right) \mathrm{V}_{2}$ $\mathrm{~V}_{2} =2 \mathrm{~V}_{1}$ Hence, the speed of water is increased by a factor of 2 .
UPSEE - 2005
Mechanical Properties of Fluids
143375
In a turbulent flow, the velocity of the liquid in contact with the walls of the tube is
1 zero
2 maximum
3 in between zero and maximum
4 equal to critical velocity
Explanation:
A The velocity of molecules in contact with wall is zero due to the stickness of molecules to the tube surface is zero $\stackrel{\rightarrow}{\rightarrow} \rightarrow$ $\therefore$ velocity $=0$
Mechanical Properties of Fluids
143379
The flow of liquid is laminar or stream line is determined by :
1 rate of flow of liquid
2 density of fluid
3 radius of the tube
4 coefficient of viscosity of liquid
Explanation:
D If the velocity of a flow inside the liquid remains constant both in magnitude and direction the flow is known as streamline or laminar flow. Basically, the flow of liquid is laminar or streamline is determined by coefficient of the tube. For the Laminar flow- $\text { Reynolds Number }=\frac{\text { Inertia force }}{\text { Viscous force }}$ Hence, Reynolds number depends upon the value coefficient of viscosity.
BCECE-2006
Mechanical Properties of Fluids
143368
After terminal velocity is reached, the acceleration of a body falling through a fluid is
1 equal to $g$
2 zero
3 less than $g$
4 greater than $g$
5 constant but not zero
Explanation:
B The net acceleration of the body falling through a fluid is zero because the body after attaining terminal velocity will continue to move with same velocity.
Kerala CEE - 2015
Mechanical Properties of Fluids
143380
A viscous fluid is flowing through a cylindrical tube. The velocity distribution of the fluid is best represented by the diagram :
1
2
3
4 none of these
Explanation:
C Velocity of different layer of a flowing fluid decreases with distance from the axis of the tube. So it is maximum at centre and minimum at walls. so the velocity distribution is
143385
Water is flowing through a pipe of constant cross-section. At some point the pipe becomes narrow and the cross-section is halved. The speed of water is :
1 reduced to zero
2 decreased by factor of 2
3 increased by a factor of 2
4 unchanged
Explanation:
C Given, Area of pipe when becomes narrow $\left(\mathrm{A}_{2}\right)=\frac{\mathrm{A}_{1}}{2}$ From continuity equation, $\mathrm{A}_{1} \mathrm{~V}_{1} =\mathrm{A}_{2} \mathrm{~V}_{2}$ $\mathrm{~A}_{1} \mathrm{~V}_{1} =\mathrm{A}_{2} \mathrm{~V}_{2}$ $\mathrm{~A}_{1} \mathrm{~V}_{1} =\left(\frac{\mathrm{A}_{1}}{2}\right) \mathrm{V}_{2}$ $\mathrm{~V}_{2} =2 \mathrm{~V}_{1}$ Hence, the speed of water is increased by a factor of 2 .
UPSEE - 2005
Mechanical Properties of Fluids
143375
In a turbulent flow, the velocity of the liquid in contact with the walls of the tube is
1 zero
2 maximum
3 in between zero and maximum
4 equal to critical velocity
Explanation:
A The velocity of molecules in contact with wall is zero due to the stickness of molecules to the tube surface is zero $\stackrel{\rightarrow}{\rightarrow} \rightarrow$ $\therefore$ velocity $=0$
Mechanical Properties of Fluids
143379
The flow of liquid is laminar or stream line is determined by :
1 rate of flow of liquid
2 density of fluid
3 radius of the tube
4 coefficient of viscosity of liquid
Explanation:
D If the velocity of a flow inside the liquid remains constant both in magnitude and direction the flow is known as streamline or laminar flow. Basically, the flow of liquid is laminar or streamline is determined by coefficient of the tube. For the Laminar flow- $\text { Reynolds Number }=\frac{\text { Inertia force }}{\text { Viscous force }}$ Hence, Reynolds number depends upon the value coefficient of viscosity.
BCECE-2006
Mechanical Properties of Fluids
143368
After terminal velocity is reached, the acceleration of a body falling through a fluid is
1 equal to $g$
2 zero
3 less than $g$
4 greater than $g$
5 constant but not zero
Explanation:
B The net acceleration of the body falling through a fluid is zero because the body after attaining terminal velocity will continue to move with same velocity.
Kerala CEE - 2015
Mechanical Properties of Fluids
143380
A viscous fluid is flowing through a cylindrical tube. The velocity distribution of the fluid is best represented by the diagram :
1
2
3
4 none of these
Explanation:
C Velocity of different layer of a flowing fluid decreases with distance from the axis of the tube. So it is maximum at centre and minimum at walls. so the velocity distribution is
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Mechanical Properties of Fluids
143385
Water is flowing through a pipe of constant cross-section. At some point the pipe becomes narrow and the cross-section is halved. The speed of water is :
1 reduced to zero
2 decreased by factor of 2
3 increased by a factor of 2
4 unchanged
Explanation:
C Given, Area of pipe when becomes narrow $\left(\mathrm{A}_{2}\right)=\frac{\mathrm{A}_{1}}{2}$ From continuity equation, $\mathrm{A}_{1} \mathrm{~V}_{1} =\mathrm{A}_{2} \mathrm{~V}_{2}$ $\mathrm{~A}_{1} \mathrm{~V}_{1} =\mathrm{A}_{2} \mathrm{~V}_{2}$ $\mathrm{~A}_{1} \mathrm{~V}_{1} =\left(\frac{\mathrm{A}_{1}}{2}\right) \mathrm{V}_{2}$ $\mathrm{~V}_{2} =2 \mathrm{~V}_{1}$ Hence, the speed of water is increased by a factor of 2 .
UPSEE - 2005
Mechanical Properties of Fluids
143375
In a turbulent flow, the velocity of the liquid in contact with the walls of the tube is
1 zero
2 maximum
3 in between zero and maximum
4 equal to critical velocity
Explanation:
A The velocity of molecules in contact with wall is zero due to the stickness of molecules to the tube surface is zero $\stackrel{\rightarrow}{\rightarrow} \rightarrow$ $\therefore$ velocity $=0$
Mechanical Properties of Fluids
143379
The flow of liquid is laminar or stream line is determined by :
1 rate of flow of liquid
2 density of fluid
3 radius of the tube
4 coefficient of viscosity of liquid
Explanation:
D If the velocity of a flow inside the liquid remains constant both in magnitude and direction the flow is known as streamline or laminar flow. Basically, the flow of liquid is laminar or streamline is determined by coefficient of the tube. For the Laminar flow- $\text { Reynolds Number }=\frac{\text { Inertia force }}{\text { Viscous force }}$ Hence, Reynolds number depends upon the value coefficient of viscosity.
BCECE-2006
Mechanical Properties of Fluids
143368
After terminal velocity is reached, the acceleration of a body falling through a fluid is
1 equal to $g$
2 zero
3 less than $g$
4 greater than $g$
5 constant but not zero
Explanation:
B The net acceleration of the body falling through a fluid is zero because the body after attaining terminal velocity will continue to move with same velocity.
Kerala CEE - 2015
Mechanical Properties of Fluids
143380
A viscous fluid is flowing through a cylindrical tube. The velocity distribution of the fluid is best represented by the diagram :
1
2
3
4 none of these
Explanation:
C Velocity of different layer of a flowing fluid decreases with distance from the axis of the tube. So it is maximum at centre and minimum at walls. so the velocity distribution is
143385
Water is flowing through a pipe of constant cross-section. At some point the pipe becomes narrow and the cross-section is halved. The speed of water is :
1 reduced to zero
2 decreased by factor of 2
3 increased by a factor of 2
4 unchanged
Explanation:
C Given, Area of pipe when becomes narrow $\left(\mathrm{A}_{2}\right)=\frac{\mathrm{A}_{1}}{2}$ From continuity equation, $\mathrm{A}_{1} \mathrm{~V}_{1} =\mathrm{A}_{2} \mathrm{~V}_{2}$ $\mathrm{~A}_{1} \mathrm{~V}_{1} =\mathrm{A}_{2} \mathrm{~V}_{2}$ $\mathrm{~A}_{1} \mathrm{~V}_{1} =\left(\frac{\mathrm{A}_{1}}{2}\right) \mathrm{V}_{2}$ $\mathrm{~V}_{2} =2 \mathrm{~V}_{1}$ Hence, the speed of water is increased by a factor of 2 .
UPSEE - 2005
Mechanical Properties of Fluids
143375
In a turbulent flow, the velocity of the liquid in contact with the walls of the tube is
1 zero
2 maximum
3 in between zero and maximum
4 equal to critical velocity
Explanation:
A The velocity of molecules in contact with wall is zero due to the stickness of molecules to the tube surface is zero $\stackrel{\rightarrow}{\rightarrow} \rightarrow$ $\therefore$ velocity $=0$
Mechanical Properties of Fluids
143379
The flow of liquid is laminar or stream line is determined by :
1 rate of flow of liquid
2 density of fluid
3 radius of the tube
4 coefficient of viscosity of liquid
Explanation:
D If the velocity of a flow inside the liquid remains constant both in magnitude and direction the flow is known as streamline or laminar flow. Basically, the flow of liquid is laminar or streamline is determined by coefficient of the tube. For the Laminar flow- $\text { Reynolds Number }=\frac{\text { Inertia force }}{\text { Viscous force }}$ Hence, Reynolds number depends upon the value coefficient of viscosity.
BCECE-2006
Mechanical Properties of Fluids
143368
After terminal velocity is reached, the acceleration of a body falling through a fluid is
1 equal to $g$
2 zero
3 less than $g$
4 greater than $g$
5 constant but not zero
Explanation:
B The net acceleration of the body falling through a fluid is zero because the body after attaining terminal velocity will continue to move with same velocity.
Kerala CEE - 2015
Mechanical Properties of Fluids
143380
A viscous fluid is flowing through a cylindrical tube. The velocity distribution of the fluid is best represented by the diagram :
1
2
3
4 none of these
Explanation:
C Velocity of different layer of a flowing fluid decreases with distance from the axis of the tube. So it is maximum at centre and minimum at walls. so the velocity distribution is
143385
Water is flowing through a pipe of constant cross-section. At some point the pipe becomes narrow and the cross-section is halved. The speed of water is :
1 reduced to zero
2 decreased by factor of 2
3 increased by a factor of 2
4 unchanged
Explanation:
C Given, Area of pipe when becomes narrow $\left(\mathrm{A}_{2}\right)=\frac{\mathrm{A}_{1}}{2}$ From continuity equation, $\mathrm{A}_{1} \mathrm{~V}_{1} =\mathrm{A}_{2} \mathrm{~V}_{2}$ $\mathrm{~A}_{1} \mathrm{~V}_{1} =\mathrm{A}_{2} \mathrm{~V}_{2}$ $\mathrm{~A}_{1} \mathrm{~V}_{1} =\left(\frac{\mathrm{A}_{1}}{2}\right) \mathrm{V}_{2}$ $\mathrm{~V}_{2} =2 \mathrm{~V}_{1}$ Hence, the speed of water is increased by a factor of 2 .
UPSEE - 2005
Mechanical Properties of Fluids
143375
In a turbulent flow, the velocity of the liquid in contact with the walls of the tube is
1 zero
2 maximum
3 in between zero and maximum
4 equal to critical velocity
Explanation:
A The velocity of molecules in contact with wall is zero due to the stickness of molecules to the tube surface is zero $\stackrel{\rightarrow}{\rightarrow} \rightarrow$ $\therefore$ velocity $=0$
Mechanical Properties of Fluids
143379
The flow of liquid is laminar or stream line is determined by :
1 rate of flow of liquid
2 density of fluid
3 radius of the tube
4 coefficient of viscosity of liquid
Explanation:
D If the velocity of a flow inside the liquid remains constant both in magnitude and direction the flow is known as streamline or laminar flow. Basically, the flow of liquid is laminar or streamline is determined by coefficient of the tube. For the Laminar flow- $\text { Reynolds Number }=\frac{\text { Inertia force }}{\text { Viscous force }}$ Hence, Reynolds number depends upon the value coefficient of viscosity.
BCECE-2006
Mechanical Properties of Fluids
143368
After terminal velocity is reached, the acceleration of a body falling through a fluid is
1 equal to $g$
2 zero
3 less than $g$
4 greater than $g$
5 constant but not zero
Explanation:
B The net acceleration of the body falling through a fluid is zero because the body after attaining terminal velocity will continue to move with same velocity.
Kerala CEE - 2015
Mechanical Properties of Fluids
143380
A viscous fluid is flowing through a cylindrical tube. The velocity distribution of the fluid is best represented by the diagram :
1
2
3
4 none of these
Explanation:
C Velocity of different layer of a flowing fluid decreases with distance from the axis of the tube. So it is maximum at centre and minimum at walls. so the velocity distribution is
