Verbal Reasoning - Mental Ability Questions

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
LOQ, SVX, ZCE, ?

If X's mother is the only daughter of Y's father, then Y's husband 's father is X's ___.

If 10$25 = 8, 12$25 = 10 then what is the value of 14$53 = ?

B is the brother of A, and A is the son of C. D is C's father. How is B related to D?

If 9@3=12; 15@4=22; 16@14=4; then what is the value of 6@2=?

If "*" denotes "added to", "&" denotes "divided by", "@" denotes "multiplied by" and "%" denotes "subtracted from", then 135 & 15 @ 10 % 3 * 6 = ?

If 9x3=3; 15x3=5; 60x5=12; then what is the value of 27x3 = ?

Arrange the given words in the sequence in which they occur in the dictionary.
i. nature
ii. nest
iii. numeric
iv. news