A spherical ball of radius \(r\) is falling in a viscous fluid of viscosity \(\eta\) with a velocity \(v.\) The retarding viscous force acting on the spherical ball is:
1. | inversely proportional to \(r\) but directly proportional to velocity \(v.\) |
2. | directly proportional to both radius \(r\) and velocity \(v.\) |
3. | inversely proportional to both radius \(r\) and velocity \(v.\) |
4. | directly proportional to \(r\) but inversely proportional to \(v.\) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe relative velocity of two adjacent layers of a liquid is 6 cm/s and the perpendicular distance between layers is 0.1 mm. The velocity gradient for liquid (in per second) is:
1. | 6 | 2. | 0.6 |
3. | 0.06 | 4. | 600 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology(a) | gases decreases. | (b) | liquids increases. |
(c) | gases increases. | (d) | liquids decreases. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe velocity of a small ball of mass m and density when dropped in a container filled with glycerin of density becomes constant after sometime. The viscous force acting on the ball in the final stage is:-
1.
2.
3.
4. mg
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWith an increase in temperature, the viscosity of liquid and gas, respectively will:
1. | increase and increase | 2. | increase and decrease |
3. | decrease and increase | 4. | decrease and decrease |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA metal block of area \(0.10~\text{m}^{2}\) is connected to a \(0.010\) kg mass via a string that passes over an ideal pulley (considered massless and frictionless), as in the figure below. A liquid film with a thickness of \(0.30\) mm is placed between the block and the table. When released the block moves to the right with a constant speed of \(0.085\) m/s. The coefficient of viscosity of the liquid is:
1. \(4.45 \times 10^{-2}~\text{Pa-s}\)
2. \(4.45 \times 10^{-3}~\text{Pa-s}\)
3. \(3.45 \times 10^{-2}~\text{Pa-s}\)
4. \(3.45 \times 10^{-3}~\text{Pa-s}\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA square plate of 0.1 m side moves parallel to a second plate with a velocity of 0.1 m/s, both plates being immersed in water. If the viscous force is 0.002 N and the coefficient of viscosity is 0.01 poise, then the distance between the plates in m is:
1. | 0.1 | 2. | 0.05 |
3. | 0.005 | 4. | 0.0005 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology