Question 1
In a tug of war the rope stays still and moves neither way. What does this tell you?
The right answer is the one marked above.
The forces acting on the rope add up to zero. Both teams are pulling all the while; the forces are equal and opposite, so their sum is zero.
The trap here is reading stillness as the absence of force. Remove both forces and the rope is still just as still — but that is not equilibrium, it is simply nothing acting.