If an object weighs $275 \ lb$,what is its weight in $kg$? $(1 \ kg = 2.205 \ lb)$

Calculate the number of seconds in $4$ days. (in $s$)

The prefix $10^{18}$ is

Select the $INCORRECT$ statement/s from the following:
$(a)$ $22$ books have infinite significant figures
$(b)$ In the answer of calculation $2.5 \times 1.25$,the result has four significant figures.
$(c)$ Zeros preceding the first non-zero digit are significant.
$(d)$ In the answer of calculation $12.11 + 18.0 + 1.012$,the result has three significant figures.

$1 \, amu = ........ \, mg.$

$A$ cuboidal container is filled with $20 \ L$ of water. If the length of the container is $30 \ cm$ and the width is $25 \ cm$,then the height will be ..... $dm$.