09. Critical velocity and Reynolds number
Mechanical Properties of Fluids

143388 A copper ball of radius 3.0 mm falls in an oil tank of viscosity 1 kg/m-s. Then, the terminal velocity of the copper ball will be (Density of oil =1.5×103 kg/m3, Density of copper =9×103 kg/m3 and g=10 m/s2.)

1 18×102 m/s
2 25×102 m/s
3 15×102 m/s
4 20×102 m/s
Mechanical Properties of Fluids

143390 The Reynold's number for a liquid flow in a tube does NOT depend on

1 the velocity of the liquid
2 the viscosity of the liquid
3 the length of the tube
4 the diameter of the tube
Mechanical Properties of Fluids

143392 A metallic spherical ball of mass M is dropped into a liquid and after some time it reaches a terminal velocity of v. If another spherical ball of mass 8M made of the same metal is dropped into the same liquid, then its terminal velocity will be (assume the spheres to be uniformly dense)

1 8v
2 v8
3 2v
4 4v
Mechanical Properties of Fluids

143389 Assertion: For Reynold's number Re>2000, the flow of fluid is turbulent.
Reason: Inertial forces are dominant compared to the viscous forces at such high Reynold's numbers.

1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
Mechanical Properties of Fluids

143388 A copper ball of radius 3.0 mm falls in an oil tank of viscosity 1 kg/m-s. Then, the terminal velocity of the copper ball will be (Density of oil =1.5×103 kg/m3, Density of copper =9×103 kg/m3 and g=10 m/s2.)

1 18×102 m/s
2 25×102 m/s
3 15×102 m/s
4 20×102 m/s
Mechanical Properties of Fluids

143390 The Reynold's number for a liquid flow in a tube does NOT depend on

1 the velocity of the liquid
2 the viscosity of the liquid
3 the length of the tube
4 the diameter of the tube
Mechanical Properties of Fluids

143392 A metallic spherical ball of mass M is dropped into a liquid and after some time it reaches a terminal velocity of v. If another spherical ball of mass 8M made of the same metal is dropped into the same liquid, then its terminal velocity will be (assume the spheres to be uniformly dense)

1 8v
2 v8
3 2v
4 4v
Mechanical Properties of Fluids

143393 The flow rate of water from a tap of diameter 1.25 cm is 3 litres per minute. If coefficient of viscosity of water is 103 Pa.s, the nature of flow is

1 Unsteady
2 Turbulent
3 Streamlined
4 Laminar
Mechanical Properties of Fluids

143389 Assertion: For Reynold's number Re>2000, the flow of fluid is turbulent.
Reason: Inertial forces are dominant compared to the viscous forces at such high Reynold's numbers.

1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
Mechanical Properties of Fluids

143388 A copper ball of radius 3.0 mm falls in an oil tank of viscosity 1 kg/m-s. Then, the terminal velocity of the copper ball will be (Density of oil =1.5×103 kg/m3, Density of copper =9×103 kg/m3 and g=10 m/s2.)

1 18×102 m/s
2 25×102 m/s
3 15×102 m/s
4 20×102 m/s
Mechanical Properties of Fluids

143390 The Reynold's number for a liquid flow in a tube does NOT depend on

1 the velocity of the liquid
2 the viscosity of the liquid
3 the length of the tube
4 the diameter of the tube
Mechanical Properties of Fluids

143392 A metallic spherical ball of mass M is dropped into a liquid and after some time it reaches a terminal velocity of v. If another spherical ball of mass 8M made of the same metal is dropped into the same liquid, then its terminal velocity will be (assume the spheres to be uniformly dense)

1 8v
2 v8
3 2v
4 4v
Mechanical Properties of Fluids

143393 The flow rate of water from a tap of diameter 1.25 cm is 3 litres per minute. If coefficient of viscosity of water is 103 Pa.s, the nature of flow is

1 Unsteady
2 Turbulent
3 Streamlined
4 Laminar
Mechanical Properties of Fluids

143389 Assertion: For Reynold's number Re>2000, the flow of fluid is turbulent.
Reason: Inertial forces are dominant compared to the viscous forces at such high Reynold's numbers.

1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
Mechanical Properties of Fluids

143388 A copper ball of radius 3.0 mm falls in an oil tank of viscosity 1 kg/m-s. Then, the terminal velocity of the copper ball will be (Density of oil =1.5×103 kg/m3, Density of copper =9×103 kg/m3 and g=10 m/s2.)

1 18×102 m/s
2 25×102 m/s
3 15×102 m/s
4 20×102 m/s
Mechanical Properties of Fluids

143390 The Reynold's number for a liquid flow in a tube does NOT depend on

1 the velocity of the liquid
2 the viscosity of the liquid
3 the length of the tube
4 the diameter of the tube
Mechanical Properties of Fluids

143392 A metallic spherical ball of mass M is dropped into a liquid and after some time it reaches a terminal velocity of v. If another spherical ball of mass 8M made of the same metal is dropped into the same liquid, then its terminal velocity will be (assume the spheres to be uniformly dense)

1 8v
2 v8
3 2v
4 4v
Mechanical Properties of Fluids

143393 The flow rate of water from a tap of diameter 1.25 cm is 3 litres per minute. If coefficient of viscosity of water is 103 Pa.s, the nature of flow is

1 Unsteady
2 Turbulent
3 Streamlined
4 Laminar
Mechanical Properties of Fluids

143389 Assertion: For Reynold's number Re>2000, the flow of fluid is turbulent.
Reason: Inertial forces are dominant compared to the viscous forces at such high Reynold's numbers.

1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
Mechanical Properties of Fluids

143388 A copper ball of radius 3.0 mm falls in an oil tank of viscosity 1 kg/m-s. Then, the terminal velocity of the copper ball will be (Density of oil =1.5×103 kg/m3, Density of copper =9×103 kg/m3 and g=10 m/s2.)

1 18×102 m/s
2 25×102 m/s
3 15×102 m/s
4 20×102 m/s
Mechanical Properties of Fluids

143390 The Reynold's number for a liquid flow in a tube does NOT depend on

1 the velocity of the liquid
2 the viscosity of the liquid
3 the length of the tube
4 the diameter of the tube
Mechanical Properties of Fluids

143392 A metallic spherical ball of mass M is dropped into a liquid and after some time it reaches a terminal velocity of v. If another spherical ball of mass 8M made of the same metal is dropped into the same liquid, then its terminal velocity will be (assume the spheres to be uniformly dense)

1 8v
2 v8
3 2v
4 4v
Mechanical Properties of Fluids

143393 The flow rate of water from a tap of diameter 1.25 cm is 3 litres per minute. If coefficient of viscosity of water is 103 Pa.s, the nature of flow is

1 Unsteady
2 Turbulent
3 Streamlined
4 Laminar
Mechanical Properties of Fluids

143389 Assertion: For Reynold's number Re>2000, the flow of fluid is turbulent.
Reason: Inertial forces are dominant compared to the viscous forces at such high Reynold's numbers.

1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.