$4.$ True or false: $(4\backslash \%)$

$10.($a$)$ The entropy of the $\backslash ($ u $\backslash )$

$($b$)$

The entropy of any universe remains constant when a reversible process occurs.

$($c$)$

$($d$)$

The entropy of any system must increstant when a reversible process occurs.

$(45\backslash \%)$