ex1.
d) A evalutes to 1 so logical-not A is 0. V also evalutes to 0 so if we logical-or these two we get 0, or falso. Well done.

ex2.
d) The are the only two correct statements here.

ex3.
d) a,b,c and d. All of the statements here are correct.

ex4.
c) All of these statements are correct. Well done.

ex5.
c) Y has an X in the most significant bit so the result of the logical equality expression is X.

ex6.
b) This is the only expression that is not true. If a is equal to X then a comparison is done between b and c and this will yield the result x1x.

ex7.
c) This point is worth remembering because you can run into lots of difficulties with your arithmetic otherwise.