A body floats at 4°C water. If temperature reaches 100°C, then
A. The body will sink
B. No change
C. More part of the body will submerge
D. The body will float freely
Answer: Option A
Solution (By Examveda Team)
The key to understanding this lies in how water's density changes with temperature.Water has a unique property: Its density is maximum at 4°C.
When water is at 4°C, it's at its densest.
As the temperature increases from 4°C to 100°C, the density of water decreases.
Archimedes' Principle: A body floats when the buoyant force (upward force exerted by the fluid) equals the weight of the body.
The buoyant force depends on the volume of fluid displaced and the density of the fluid.
Since the water density decreases when heated to 100°C, a larger volume of water needs to be displaced to provide the same buoyant force to support the body's weight.
Therefore, more of the body will submerge to displace the necessary volume of the less dense (warmer) water.
So, the correct answer is (C).
This Question Belongs to Physics GK Chapter Wise >> Mechanical Physics
Join The Discussion
Comments (1)
The body is called perfectly plastic body
A. if the body completely gain its original shape after removal of deforming force
B. if the body remains in deformed shape even after removal of the deforming force
C. if weight of the body is equal to force of buoyancy
D. None of the above
Pressure is a scalar quantity because
A. it is the ratio of force to area and both force and area are vectors
B. it is the ratio of magnitude of force to area
C. it is the ratio of component of force (normal to area) to area
D. None of the above
Why do water droplets always take a round shape when dropped onto plane surfaces?
A. Due to gravity
B. Due to atmospheric pressure
C. Due to the presence of Eddy current in the air
D. Due to exertion of surface tension by the molecules
C. is correct