$5.74 \; g$ of a substance occupies $1.2 \; cm^3$. Express its density (in $g/cm^3$) by keeping the significant figures in view.

Value of round off of numbers $2.745$ and $2.735$ up to $3$ significant digits will be

The number of significant figures in the quantity $0.00005041 \ J$ is

The volume of a sphere is $1.76 \ cm^3$. The volume of $25$ such spheres,taking into account significant figures,is:

The order of magnitude of the speed of light in $SI$ units is ........

$A$ student measuring the diameter of a pencil of circular cross-section with the help of a vernier scale records the following four readings: $5.50\, mm, 5.55\, mm, 5.45\, mm, 5.65\, mm$. The average of these four readings is $5.5375\, mm$ and the standard deviation of the data is $0.07395\, mm$. The average diameter of the pencil should therefore be recorded as: