Question

if the density of solid and liquid are same then and the object is completely immersed then is the weight of solid 0?

Answer 1

when a solid is fully immersed in a liquid, it loses weight which is equal to the weight of the liquid it displaces.
The more a body is immersed in water, the more the weight of the body decreases. The weight of the body is least when it is completely immersed in water. This means that loss in weight of the body increases as it is completely immersed in water.

When a body is partly or completely immersed in water (or any other liquid), then:

Loss in weight of body = Weight of water (liquid) displaced by the body = Buoyant force or upthrust exerted by water (any liquid) on the body.

I hope it will help u.....