Self Evaluation Test

Two blocks of equal masses of lead and copper are immersed in water. They experience buoyant forces ${\mathrm{F}}_1$ and ${\mathrm{F}}_2$ respectively. What will be the ratio of ${\mathrm{F}}_1$ and ${\mathrm{F}}_2$ $(>,=$or $<1)$ ?

The area of cross-section of press plunger of a hydraulic press is $3 {\mathrm{m}}^2$. It is required to overcome a resistive load of $3000 \mathrm{N}$ on it. Calculate the force required on the pump plunger, if the area of cross-section of the pump plunger is $0.02 {\mathrm{m}}^2$.

In a barometer, for the following observations regarding weather, what will be your inferences?
Gradual fall in the mercury level.

In a barometer, for the following observations regarding weather, what will be your inferences?
Sudden rise in the mercury level.

In a barometer, for the following observations regarding weather, what will be your inferences?
Gradual rise in the mercury level.

Describe an experiment to show that a body immersed in water appears lighter than it really is.

A block of wood floats in freshwater with two-third of its volume $\mathrm{V}$ submerged and in oil with $0.92 \mathrm{V}$ submerged. Calculate the density of wood .

A block of wood floats in freshwater with two-third of its volume $\mathrm{V}$ submerged and in oil with $0.92 \mathrm{V}$  submerged. Calculate the density of oil if the density of wood $667 {\mathrm{kgm}}^{-3}$.