Dimensions of pressure are the same as that of

Which of the following have the same number of significant figures?
$(A)$ $0.00253$
$(B)$ $1.0003$
$(C)$ $15.0$
$(D)$ $163$
Choose the correct answer from the options given below:

Using the rules for significant figures,the correct answer for the expression $\frac{0.02858 \times 0.112}{0.5702}$ will be .... .

In the equation of state of an ideal gas $PV = nRT$,the value of the universal gas constant $R$ depends only on:

Perform the following calculations for the given exponential numbers:
$(i)$ $(6.7 \times 10^4) \times (8.4 \times 10^7)$
$(ii)$ $\frac{(3.4 \times 10^{-3})}{(6.5 \times 10^{-7})}$

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