Q. If the temperature of water increases then the apparent weight of a wood block
a. increase
b. decreases
c. Either increases or decreases
d. none of the above

Give reason.

Dear student,
 
  1. The density/volume of the fluid changes due to increase/decrease in temperature
  2. The volume of the material which is immersed changes due to temperature change.
So if the density decreases, the upward thrust/force decreases and the height of material above fluid will decrease. Hence the volume above liquid decreases

As the wooden block floats on water, its apparent weight is zero , the increase in temperature, neither increases nor decreases the apparent weight of the wooden block
Regards

 

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