$(i)$ Write the full form of $(a)$ $LPG$ $(b)$ $CNG$.
$(ii)$ Give one use of each.

Match the physical quantities given in column $A$ to their $SI$ units given in column $B$.

Column $A$	Column $B$
$(a)$ Pressure	$(i)$ cubic metre
$(b)$ Temperature	$(ii)$ kilogram
$(c)$ Density	$(iii)$ pascal
$(d)$ Mass	$(iv)$ kelvin
$(e)$ Volume	$(v)$ kilogram per cubic metre

Comment upon the following: Rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy, and density.

Give differences between diffusion and osmosis.

Give reasons for the following observations:
$(a)$ Naphthalene balls disappear with time without leaving any solid.
$(b)$ We can get the smell of perfume sitting several metres away.

$(a)$ Define boiling point.
$(b)$ Express the boiling point of water in Celsius as well as Kelvin scale.
$(c)$ $A$ diver is able to cut through water in a swimming pool. Which property of matter does this observation show?