Which prefix used in the $SI$ system has a multiplier of $10^{-6}$?

How many significant figures are present in $7.964 \times 10^{3}$?

$A$ volume of $1 \ m^3$ is equal to

The prefix $10^{18}$ is

One calorie is equal to (in $J$)

If the diameter of a carbon atom is $0.15 \,nm$,calculate the number of carbon atoms which can be placed side by side in a straight line across the length of a scale of length $20 \,cm$.