Viscocity
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PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361343 Assertion :
The viscosity of liquid increases with rise of tempature.
Reason :
Viscosity of a liquid is the property of the liquid by virtue of which it opposes the relative motion among its different layers.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361344 After the storm, the sea water waves subside due to

1 Surface tension of sea-water
2 Disappearance of heavy currents
3 The viscosity of sea water
4 Gravitational pull of the storm
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361345 Viscosity is the property by virtue of which a liquid

1 Occupies minimum surface area
2 Offers resistance for the relative motion between its layers.
3 Becomes spherical in shape
4 Tends to gain its deformed position.
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361346 A fluid with viscosity \(\eta\) fills the space between two along co-axial cylinders of radii \(R_{1}\) and \(R_{2}\). The inner cylinder is stationary while the outer one is rotated with a constant angular velocity \(\omega_{2}\). The fluid flow is laminar. Taking into account that the friction force acting on a unit area of cylindrical surface radius \(r\) is defined by the formula \(\sigma=\eta r\left(\dfrac{d \omega}{d r}\right)\), find the angular velocity of rotating fluid as a function of radius \(r\).
supporting img

1 \(\omega_{2}\left[\dfrac{1}{R_{1}^{2}}-\dfrac{1}{r^{2}}\right] \dfrac{R_{1}^{2} R_{2}^{2}}{R_{2}^{2}-R_{1}^{2}}\)
2 \(\dfrac{\omega_{2} R_{1} R_{2}}{R_{2}-R_{1}}\)
3 \(\dfrac{\omega_{2} R_{1}^{2} R_{2}^{2}}{R_{2}^{2}-R_{1}^{2}}\)
4 None of these
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PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361343 Assertion :
The viscosity of liquid increases with rise of tempature.
Reason :
Viscosity of a liquid is the property of the liquid by virtue of which it opposes the relative motion among its different layers.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361344 After the storm, the sea water waves subside due to

1 Surface tension of sea-water
2 Disappearance of heavy currents
3 The viscosity of sea water
4 Gravitational pull of the storm
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361345 Viscosity is the property by virtue of which a liquid

1 Occupies minimum surface area
2 Offers resistance for the relative motion between its layers.
3 Becomes spherical in shape
4 Tends to gain its deformed position.
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361346 A fluid with viscosity \(\eta\) fills the space between two along co-axial cylinders of radii \(R_{1}\) and \(R_{2}\). The inner cylinder is stationary while the outer one is rotated with a constant angular velocity \(\omega_{2}\). The fluid flow is laminar. Taking into account that the friction force acting on a unit area of cylindrical surface radius \(r\) is defined by the formula \(\sigma=\eta r\left(\dfrac{d \omega}{d r}\right)\), find the angular velocity of rotating fluid as a function of radius \(r\).
supporting img

1 \(\omega_{2}\left[\dfrac{1}{R_{1}^{2}}-\dfrac{1}{r^{2}}\right] \dfrac{R_{1}^{2} R_{2}^{2}}{R_{2}^{2}-R_{1}^{2}}\)
2 \(\dfrac{\omega_{2} R_{1} R_{2}}{R_{2}-R_{1}}\)
3 \(\dfrac{\omega_{2} R_{1}^{2} R_{2}^{2}}{R_{2}^{2}-R_{1}^{2}}\)
4 None of these
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PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361343 Assertion :
The viscosity of liquid increases with rise of tempature.
Reason :
Viscosity of a liquid is the property of the liquid by virtue of which it opposes the relative motion among its different layers.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361344 After the storm, the sea water waves subside due to

1 Surface tension of sea-water
2 Disappearance of heavy currents
3 The viscosity of sea water
4 Gravitational pull of the storm
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361345 Viscosity is the property by virtue of which a liquid

1 Occupies minimum surface area
2 Offers resistance for the relative motion between its layers.
3 Becomes spherical in shape
4 Tends to gain its deformed position.
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361346 A fluid with viscosity \(\eta\) fills the space between two along co-axial cylinders of radii \(R_{1}\) and \(R_{2}\). The inner cylinder is stationary while the outer one is rotated with a constant angular velocity \(\omega_{2}\). The fluid flow is laminar. Taking into account that the friction force acting on a unit area of cylindrical surface radius \(r\) is defined by the formula \(\sigma=\eta r\left(\dfrac{d \omega}{d r}\right)\), find the angular velocity of rotating fluid as a function of radius \(r\).
supporting img

1 \(\omega_{2}\left[\dfrac{1}{R_{1}^{2}}-\dfrac{1}{r^{2}}\right] \dfrac{R_{1}^{2} R_{2}^{2}}{R_{2}^{2}-R_{1}^{2}}\)
2 \(\dfrac{\omega_{2} R_{1} R_{2}}{R_{2}-R_{1}}\)
3 \(\dfrac{\omega_{2} R_{1}^{2} R_{2}^{2}}{R_{2}^{2}-R_{1}^{2}}\)
4 None of these
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PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361343 Assertion :
The viscosity of liquid increases with rise of tempature.
Reason :
Viscosity of a liquid is the property of the liquid by virtue of which it opposes the relative motion among its different layers.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361344 After the storm, the sea water waves subside due to

1 Surface tension of sea-water
2 Disappearance of heavy currents
3 The viscosity of sea water
4 Gravitational pull of the storm
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361345 Viscosity is the property by virtue of which a liquid

1 Occupies minimum surface area
2 Offers resistance for the relative motion between its layers.
3 Becomes spherical in shape
4 Tends to gain its deformed position.
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361346 A fluid with viscosity \(\eta\) fills the space between two along co-axial cylinders of radii \(R_{1}\) and \(R_{2}\). The inner cylinder is stationary while the outer one is rotated with a constant angular velocity \(\omega_{2}\). The fluid flow is laminar. Taking into account that the friction force acting on a unit area of cylindrical surface radius \(r\) is defined by the formula \(\sigma=\eta r\left(\dfrac{d \omega}{d r}\right)\), find the angular velocity of rotating fluid as a function of radius \(r\).
supporting img

1 \(\omega_{2}\left[\dfrac{1}{R_{1}^{2}}-\dfrac{1}{r^{2}}\right] \dfrac{R_{1}^{2} R_{2}^{2}}{R_{2}^{2}-R_{1}^{2}}\)
2 \(\dfrac{\omega_{2} R_{1} R_{2}}{R_{2}-R_{1}}\)
3 \(\dfrac{\omega_{2} R_{1}^{2} R_{2}^{2}}{R_{2}^{2}-R_{1}^{2}}\)
4 None of these