Viscocity
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PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361381 What is the velocity \(v\) of a metallic ball of radius \(r\) falling in a tank of liquid at the instant when its acceleration is one-half that of a freely falling body?(The densities of metal and of liquid are \(\rho\) and \(\sigma\), respectively and the viscosity of liquid is \(\eta\) )

1 \(\dfrac{r^{2} g}{9 \eta}(\rho-2 \sigma)\)
2 \(\dfrac{r^{2} g}{9 \eta}(2 \rho-\sigma)\)
3 \(\dfrac{r^{2} g}{9 \eta}(\rho-\sigma)\)
4 \(\dfrac{2 r^{2} g}{9 \eta}(\rho-\sigma)\)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361382 What is the velocity \(v\) of a metallic ball of radius \(r\) falling in a tank of liquid at the instant when its acceleration is one-half that of a freely falling body? (The densities of metal and of liquid are \(\rho\) and \(\sigma\) respectively, and the viscosity of the liquid is \(\eta\) )

1 \(\dfrac{r^{2} g}{9 \eta}(\rho-2 \sigma)\)
2 \(\dfrac{r^{2} g}{9 \eta}(2 \rho-\sigma)\)
3 \(\dfrac{r^{2} g}{9 \eta}(\rho-\sigma)\)
4 \(\dfrac{2 r^{2} g}{9 \eta}(\rho-\sigma)\)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361383 Two rain drops reach the earth with different terminal velocities having ratio \(9: 4\). Then the ratio of their volume is

1 \(3: 2\)
2 \(4: 9\)
3 \(9: 4\)
4 \(27: 8\)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361384 Assertion :
Terminal velocity is same as the critical velocity
Reason :
The constant velocity of fall of a body through a viscous fluid is called terminal velocity.

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.
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PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361381 What is the velocity \(v\) of a metallic ball of radius \(r\) falling in a tank of liquid at the instant when its acceleration is one-half that of a freely falling body?(The densities of metal and of liquid are \(\rho\) and \(\sigma\), respectively and the viscosity of liquid is \(\eta\) )

1 \(\dfrac{r^{2} g}{9 \eta}(\rho-2 \sigma)\)
2 \(\dfrac{r^{2} g}{9 \eta}(2 \rho-\sigma)\)
3 \(\dfrac{r^{2} g}{9 \eta}(\rho-\sigma)\)
4 \(\dfrac{2 r^{2} g}{9 \eta}(\rho-\sigma)\)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361382 What is the velocity \(v\) of a metallic ball of radius \(r\) falling in a tank of liquid at the instant when its acceleration is one-half that of a freely falling body? (The densities of metal and of liquid are \(\rho\) and \(\sigma\) respectively, and the viscosity of the liquid is \(\eta\) )

1 \(\dfrac{r^{2} g}{9 \eta}(\rho-2 \sigma)\)
2 \(\dfrac{r^{2} g}{9 \eta}(2 \rho-\sigma)\)
3 \(\dfrac{r^{2} g}{9 \eta}(\rho-\sigma)\)
4 \(\dfrac{2 r^{2} g}{9 \eta}(\rho-\sigma)\)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361383 Two rain drops reach the earth with different terminal velocities having ratio \(9: 4\). Then the ratio of their volume is

1 \(3: 2\)
2 \(4: 9\)
3 \(9: 4\)
4 \(27: 8\)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361384 Assertion :
Terminal velocity is same as the critical velocity
Reason :
The constant velocity of fall of a body through a viscous fluid is called terminal velocity.

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.
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PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361381 What is the velocity \(v\) of a metallic ball of radius \(r\) falling in a tank of liquid at the instant when its acceleration is one-half that of a freely falling body?(The densities of metal and of liquid are \(\rho\) and \(\sigma\), respectively and the viscosity of liquid is \(\eta\) )

1 \(\dfrac{r^{2} g}{9 \eta}(\rho-2 \sigma)\)
2 \(\dfrac{r^{2} g}{9 \eta}(2 \rho-\sigma)\)
3 \(\dfrac{r^{2} g}{9 \eta}(\rho-\sigma)\)
4 \(\dfrac{2 r^{2} g}{9 \eta}(\rho-\sigma)\)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361382 What is the velocity \(v\) of a metallic ball of radius \(r\) falling in a tank of liquid at the instant when its acceleration is one-half that of a freely falling body? (The densities of metal and of liquid are \(\rho\) and \(\sigma\) respectively, and the viscosity of the liquid is \(\eta\) )

1 \(\dfrac{r^{2} g}{9 \eta}(\rho-2 \sigma)\)
2 \(\dfrac{r^{2} g}{9 \eta}(2 \rho-\sigma)\)
3 \(\dfrac{r^{2} g}{9 \eta}(\rho-\sigma)\)
4 \(\dfrac{2 r^{2} g}{9 \eta}(\rho-\sigma)\)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361383 Two rain drops reach the earth with different terminal velocities having ratio \(9: 4\). Then the ratio of their volume is

1 \(3: 2\)
2 \(4: 9\)
3 \(9: 4\)
4 \(27: 8\)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361384 Assertion :
Terminal velocity is same as the critical velocity
Reason :
The constant velocity of fall of a body through a viscous fluid is called terminal velocity.

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.
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PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361381 What is the velocity \(v\) of a metallic ball of radius \(r\) falling in a tank of liquid at the instant when its acceleration is one-half that of a freely falling body?(The densities of metal and of liquid are \(\rho\) and \(\sigma\), respectively and the viscosity of liquid is \(\eta\) )

1 \(\dfrac{r^{2} g}{9 \eta}(\rho-2 \sigma)\)
2 \(\dfrac{r^{2} g}{9 \eta}(2 \rho-\sigma)\)
3 \(\dfrac{r^{2} g}{9 \eta}(\rho-\sigma)\)
4 \(\dfrac{2 r^{2} g}{9 \eta}(\rho-\sigma)\)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361382 What is the velocity \(v\) of a metallic ball of radius \(r\) falling in a tank of liquid at the instant when its acceleration is one-half that of a freely falling body? (The densities of metal and of liquid are \(\rho\) and \(\sigma\) respectively, and the viscosity of the liquid is \(\eta\) )

1 \(\dfrac{r^{2} g}{9 \eta}(\rho-2 \sigma)\)
2 \(\dfrac{r^{2} g}{9 \eta}(2 \rho-\sigma)\)
3 \(\dfrac{r^{2} g}{9 \eta}(\rho-\sigma)\)
4 \(\dfrac{2 r^{2} g}{9 \eta}(\rho-\sigma)\)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361383 Two rain drops reach the earth with different terminal velocities having ratio \(9: 4\). Then the ratio of their volume is

1 \(3: 2\)
2 \(4: 9\)
3 \(9: 4\)
4 \(27: 8\)
PHXI10:MECHANICAL PROPERTIES OF FLUIDS

361384 Assertion :
Terminal velocity is same as the critical velocity
Reason :
The constant velocity of fall of a body through a viscous fluid is called terminal velocity.

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.
For More Updates join with Us
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