One calorie is equal to (in $J$)

$81.4 \ g$ sample of ethyl alcohol contains $0.002 \ g$ of water. The amount of pure ethyl alcohol in $g$ to the proper number of significant figures is:

The sum of three values $12.0$, $19.034$ and $2.0143$ is equal to $X$. The number of significant figures in $X$ is

Pressure is determined as force per unit area of the surface. The $SI$ unit of pressure, Pascal is as shown below:
$1 \, Pa = 1 \, N \, m^{-2}$
If mass of air at sea level is $1034 \, g \, cm^{-2}$, calculate the pressure in Pascal.

What would be the $SI$ unit for the quantity $\frac{p V^{2} T^{2}}{n}$?

The largest unit of energy among the following is ...... .