Medium
$Assertion :$ $A$ thin stainless steel needle can float on a still water surface.
$Reason :$ Any object floats when the buoyancy force balances the weight of the object.
$Reason :$ Any object floats when the buoyancy force balances the weight of the object.
- AIf both $Assertion$ and $Reason$ are correct and the $Reason$ is a correct explanation of the $Assertion$.
- BIf both $Assertion$ and $Reason$ are correct but $Reason$ is not a correct explanation of the $Assertion$.
- CIf the $Assertion$ is correct but $Reason$ is incorrect.
- DIf both the $Assertion$ and $Reason$ are incorrect.
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$A$ cylindrical vessel partially filled with water is rotated about its vertical central axis. Its surface will
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View Solution$A$ balloon is made of a material of surface tension $S$ and its inflation outlet (from where gas is filled in it) has small area $A$. It is filled with a gas of density $\rho$ and takes a spherical shape of radius $R$. When the gas is allowed to flow freely out of it,its radius changes from $R$ to $0$ in time $T$. If the speed $\psi(r)$ of gas coming out of the balloon depends on $r$ as $r^\alpha$ and $T \propto S^a A^\beta \rho^\gamma R^\delta$,then:
DifficultNEET 2025
View SolutionMatch column-$I$ with column-$II$.
Column-$I$ Column-$II$ $(A)$ Hydraulic lift $(P)$ Archimedes' principle $(B)$ Razor blade can be made to float on the surface of water $(Q)$ Pascal's law $(C)$ The dam of a reservoir is made thick at the bottom $(R)$ Surface tension $(D)$ Ship is floating on the ocean $(S)$ Pressure
| Column-$I$ | Column-$II$ |
|---|---|
| $(A)$ Hydraulic lift | $(P)$ Archimedes' principle |
| $(B)$ Razor blade can be made to float on the surface of water | $(Q)$ Pascal's law |
| $(C)$ The dam of a reservoir is made thick at the bottom | $(R)$ Surface tension |
| $(D)$ Ship is floating on the ocean | $(S)$ Pressure |
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View SolutionWhich of the following is not the property of an ideal fluid?
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