Provide the full forms for the following:
$(i)$ $CGPM$
$(ii)$ $amu$
$(iii)$ $u$

Choose the correct statements.
$A$. Weight of a substance is the amount of matter present in it.
$B$. Mass is the force exerted by gravity on an object.
$C$. Volume is the amount of space occupied by a substance.
$D$. Temperatures below $0^{\circ} C$ are possible in Celsius scale,but in Kelvin scale negative temperature is not possible.
$E$. Precision refers to the closeness of various measurements for the same quantity.

Match the physical quantities in List-$A$ with their corresponding units in List-$B$.

List-$A$	List-$B$
$(1)$ Electric current	$(A)$ Kilogram
$(2)$ Luminous intensity	$(B)$ Mole
$(3)$ Amount of substance	$(C)$ Ampere
$(4)$ Mass	$(D)$ Candela

How many significant figures are present in the following?
$(i)$ $0.0025$
$(ii)$ $208$
$(iii)$ $5005$
$(iv)$ $126.000$
$(v)$ $500.0$
$(vi)$ $2.0034$

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

How is $5000$ represented with $3$ significant figures?