What are the main branches of physical sciences?

Name the steps through which science is applied.

How does the weight of a body change with the change in altitude?

Why is the density of solid remains constant for minor changes in temperature?

The mass of a bottle with water is found to be $150 \mathrm{g}$. The mass of the empty bottle is $50 \mathrm{g}$ and the external volume of the container is $125 {\mathrm{cm}}^3$. Find out the density of the material of the bottle.

Ten identical metallic balls of density $5 \mathrm{g} {\mathrm{cm}}^{-3}$ when dropped into water, the volume of the water displaced is found to be $500 {\mathrm{cm}}^3$. Determine the mass of each metallic ball.