$Assertion :$ A thin stainless steel needle can lay floating 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
AIIMS 2006, Medium
Download our app for free and get started
Assertion and Reason are correct. But Reason does not explain Assertion. Explanation of Assertion is that it is the surface tension of the water surface which is balancing the weight of the steel needle.
Download our appand get started for free
Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*
Similar Questions
- 1View SolutionWater flows out of the hole on the side of a bucket and follows a parabolic path. If the bucket falls freely under gravity, ignoring air resistance, the water flow
- 2View SolutionWater is flowing through a horizontal pipe of non-uniform cross-section. At the extreme narrow portion of the pipe, the water will have
- 3Two cylindrical vessels of equal cross-sectional area $16\,cm ^{2}$ contain water upto herghts $100\,cm$ and $150\,cm$ respectively. The vessels are interconnected so that the water levels in them become equal. The work done by the force of gravity during the process, is $......J$ [Take density of water $=10^{3}\,kg / m ^{3}$ and $g =10\,ms ^{-2}$ ]View Solution
- 4A cube of wood supporting $200\,gm$ mass just floats in water. When the mass is removed, the cube rises by $2\, cm$. ............ $cm$ is the side of cube .View Solution
- 5The velocity of water in a river is $18\, km/h$ near the surface. If the river is $5\, m$ deep, find the shearing stress between the horizontal layers of water. The co-efficient of viscosity of water $= 10^{-2}\,,poise$View Solution
- 6View SolutionSelect the correct statement regarding stream line flow
- 7What is the velocity $v$ of a metallic ball of radius $r$ falling in a tank of liquid at the instant when its acceleration is one-half that of a freely falling body ? (The densities of metal and of liquid are $\rho$ and $\sigma$ respectively, and the viscosity of the liquid is $\eta$).View Solution
- 8View SolutionWater falls from a tap, down the streamline
- 9An object is located at $2\, km$ beneath the surface of the water. If the fractional compression $\frac{\Delta V }{ V }$ is $1.36\, \%,$ the ratio of hydraulic stress to the corresponding hydraulic strain will be ......... . [Given : density of water is $1000\, kg m ^{-3}$ and $\left. g =9.8 \,ms ^{-2} .\right]$View Solution
- 10View SolutionIn a laminar flow the velocity of the liquid in contact with the walls of the tube is