The internal energy of a system depends on what?

Out of the following,which quantity does not depend on the path?

Which of the following parameters does not characterise the thermodynamic state of matter?

Why is work an extensive quantity?

The following three objects $(1)$ a metal tray,$(2)$ a block of wood,and $(3)$ a woolen cap are left in a closed room overnight. Next day,the temperature of each is recorded as $T_1, T_2$,and $T_3$,respectively. The likely situation is:

What are extensive variables and what are intensive variables? What are these variables?