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Q. No.A liquid can easily change its shape but a solid can not because:
| 1. | the density of a liquid is smaller than that of a solid. |
| 2. | the forces between the molecules is stronger in solid than in liquids. |
| 3. | the atoms combine to form bigger molecules in a solid. |
| 4. | the average separation between the molecules is larger in solids. |
Subtopic: Â Properties of Fluids |
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Level 1: 80%+
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Suppose you have taken a dilute solution of oleic acid in such a way that its concentration becomes \(0.01 ~\text{cm}^3\) of oleic acid per \(\text{cm}^3\) of the solution. Then you make a thin film of this solution (monomolecular thickness) of area \(4~\text{cm}^2\) by considering \(100\) spherical drops of radius \(\left(\frac{3}{40 \pi}\right)^{\frac{1}{3}} \times 10^{-3}~ \text{cm} \). Then the thickness of oleic acid will be:
1. \(12\times10^{-14}~\text{m}\)
2. \(25\times10^{-14}~\text{m}\)
3. \(36\times10^{-14}~\text{m}\)
4. \(48\times10^{-14}~\text{m}\)
1. \(12\times10^{-14}~\text{m}\)
2. \(25\times10^{-14}~\text{m}\)
3. \(36\times10^{-14}~\text{m}\)
4. \(48\times10^{-14}~\text{m}\)
Subtopic: Â Properties of Fluids |
 87%
Level 1: 80%+
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If \(\rho\) is the density and \(\eta\) is the coefficient of viscosity of fluid which flows with a speed \(v\) in the pipe of diameter \(d,\) the correct formula for the Reynolds number \(R_e\) is:
1. \( \mathrm{R}_e=\frac{\eta \mathrm{d}}{\rho \mathrm{v}} \)
2. \(\mathrm{R}_{\mathrm{e}}=\frac{\rho \mathrm{v}}{\eta \mathrm{d}} \)
3. \( \mathrm{R}_e=\frac{\rho v d}{\eta} \)
4. \(R_e=\frac{\eta}{\rho v d}\)
1. \( \mathrm{R}_e=\frac{\eta \mathrm{d}}{\rho \mathrm{v}} \)
2. \(\mathrm{R}_{\mathrm{e}}=\frac{\rho \mathrm{v}}{\eta \mathrm{d}} \)
3. \( \mathrm{R}_e=\frac{\rho v d}{\eta} \)
4. \(R_e=\frac{\eta}{\rho v d}\)
Subtopic: Â Properties of Fluids |
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Level 1: 80%+
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Given below are two statements:
| Assertion (A): | When toothpaste is pressed (squeezed), it follows Pascal’s law. |
| Reason (R): | When pressure is applied to a fluid, it is transmitted equally throughout the fluid in all directions and on the walls of the container. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Â Properties of Fluids |
 81%
Level 1: 80%+
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Two substances of relative densities \(\rho_{1}\) and \(\rho_{2}\) are mixed in equal volume and the relative density of the mixture is \(4.\) When they are mixed in equal masses, the relative density of the mixture is \(3.\) The values of \(\rho_{1}\) and \(\rho_{2}\) are:
1. \(\rho_{1}=6~\text{and}~\rho_{2}=2\)
2. \(\rho_{1}=3~\text{and}~\rho_{2}=5\)
3. \(\rho_{1}=12~\text{and}~\rho_{2}=4\)
4. none of these
1. \(\rho_{1}=6~\text{and}~\rho_{2}=2\)
2. \(\rho_{1}=3~\text{and}~\rho_{2}=5\)
3. \(\rho_{1}=12~\text{and}~\rho_{2}=4\)
4. none of these
Subtopic: Â Properties of Fluids |
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Level 2: 60%+
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Q. No.
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