Question

1. What is meant by buoyancy? Why does an object float or sink when placed on the surface of water?The studentswill choose any 5 packed food items, and complete the following table

S.No Names of five food Items MRP in (RS) Estimated value by general rule

Answer 1

dear friend  i only know the answer of the first question first part
Buoyancy is the tendency of an object to float on water or any fluid substance and we can say that its an anti gravitational  force or substance.
Examples:the red blood cells or erythrocytes in our body actually float  due to buoyancy and travel all across our bodies.
HOPE THIS WAS HELPFUL FRIEND :)

Answer 2

buoyancy means upthrust
it means upward force exerted by any liquid on an object.if an object has less density than water it floats
if more it sinks