A piece of iron weighs 44.5 gf in air. If the density of iron is 8.9 x 10³ kg m^-3, find the weight of the iron piece when immersed in water.

A piece of stone of mass 15.1 g is first immersed in a liquid and it weighs 10.9 gf. Then on immersing the piece of stone in water, it weighs 9.7 gf. Calculate —

(a) the weight of the piece of stone in air,

(b) the volume of the piece of stone,

(c) the relative density of stone,

(d) the relative density of the liquid.

The upthrust is maximum (= F_B) when the body is:

1. floating in the liquid
2. completely immersed inside the liquid
3. partially immersed inside the liquid
4. None of these

When the weight of a body is greater than the weight of the liquid displaced, the body will

1. float
2. sink
3. float partially outside
4. first go down then come up