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

The candela is the luminous intensity,in a given direction,of a source that emits monochromatic radiation of frequency '$A$' $\times 10^{12}$ hertz and that has a radiant intensity in that direction of $\frac{1}{B}$ watt per steradian. '$A$' and '$B$' are respectively

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

How many significant figures should be present in the answer of the following calculations?
$(i)$ $\frac{0.02856 \times 298.15 \times 0.112}{0.5785}$
$(ii)$ $5 \times 5.364$
$(iii)$ $0.0125 + 0.7864 + 0.0215$

What is the range of magnitude in chemistry measurements?

$A$ piece of metal is $3 \, in$ long. What is its length in $cm$ (in $cm$)?