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Q. No.A boat carrying a number of large stones is floating in a water tank. What will happen to the water level if the stones are unloaded into the water?
| 1. | the water level remains unchanged. |
| 2. | the water level falls. |
| 3. | the water level rises. |
| 4. | the water level rises till half the number of stones are unloaded and then begins to fall. |
Subtopic: Â Properties of Fluids |
 62%
From NCERT
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Two substances of relative densities \(\rho_{1}\) and \(\rho_{2}\) are mixed in equal volume and relative density of mixture is \(4.\) When they are mixed in equal masses, the relative density of mixture is \(3.\) The values of \(\rho_{1}\) and \(\rho_{2}\) are:
| 1. | \(\rho_{1}=6\) and \(\rho_{2}=2\) | 2. | \(\rho_{1}=3\) and \(\rho_{2}=5\) |
| 3. | \(\rho_{1}=12\) and \(\rho_{2}=4\) | 4. | none of these |
Subtopic: Â Properties of Fluids |
 79%
From NCERT
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The properties of a surface are different from those of the bulk liquid because the surface molecules
| (a) | are smaller than other molecules |
| (b) | acquire charge due to collision from air molecules |
| (c) | find different types of molecules in their range of influence |
| (d) | feel a net force in one direction |
Choose the correct option:
| 1. | (a) and (b) | 2. | (b) and (c) |
| 3. | (c) and (d) | 4. | All of these |
Subtopic: Â Properties of Fluids |
 63%
From NCERT
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