Physics - Fluid Question with Solution | TestHub
PhysicsFluidArchimedes principleMedium2 minPYQ_2018
PhysicsMediumsingle choice
Assertion : A needle placed carefully on the surface of water may float, whereas a ball of the same material will always sink. Reason : The buoyancy of an object depends both on the material and shape of the object.
Options:
Answer:
B
Solution:
A needle placed carefully on the surface of water may float due to surface tension, as upward forces due to surface tension balances the weight of the needle. But these upward forces due to surface tension are very small as compared to weight of ball, also the weight of liquid displaced by the ball immersed in liquid is less than the weight of the ball, hence ball sinks into the liquid.
Stream:AIIMSSubject:PhysicsTopic:FluidSubtopic:Archimedes principle
⏱ 2mℹ️ Source: PYQ_2018
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