A razor-blade floats on the surface of water | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) When a razor-blade floats on water,it is supported by the buoyant force (Archimedes' principle) and the upward force due to surface tension. Since

Vedclass · Accepted Answer

Volume of displaced water is lesser than blade's own volume.

Vedclass · Answer

(A) When a razor-blade floats on water,it is supported by the buoyant force (Archimedes' principle) and the upward force due to surface tension. Since the density of the blade is greater than that of water,it would normally sink. However,surface tension creates a 'dimple' in the water surface,effectively increasing the volume of water displaced beyond the actual volume of the blade. When the glass is shaken,the surface tension effect is broken,and the blade sinks. Statement $A$ is incorrect because,while floating,the effective volume of displaced water (including the surface tension effect) is equal to the volume required to balance the weight of the blade. Statement $B$ is correct because the blade displaces less water when submerged than when it was floating supported by surface tension. Statement $C$ is correct as it describes the mechanism of support. Statement $D$ is correct as it explains the equilibrium condition for the floating blade.

$A$ razor-blade floats on the surface of water contained in a glass. When the glass is gently shaken,the razor-blade sinks. Mark the incorrect statement.

Similar Questions

The diagram shows a cup of tea seen from above. The tea has been stirred and is now rotating without turbulence. $A$ graph showing the speed $v$ with which the liquid is crossing points at a distance $X$ from $O$ along a radius $XO$ would look like:

$A$ spherical raindrop evaporates at a rate proportional to its surface area. The differential equation involving the rate of change of its radius $r$ with time $t$ is ... (where $k$ is a positive constant)

An open cubical tank was initially fully filled with water. When the tank was accelerated on a horizontal plane along one of its sides,it was found that one-third of the volume of water spilled out. The acceleration was:

Give the limitations and uses of turbulence.

$A$ small air bubble is at the inner surface of the bottom of a beaker filled with cold water. Now,the water in the beaker is heated. The size of the bubble increases. The reason for this may be:

Vedclass Test Series

Exam Paper Generator

Online Exam Module