Verbal Reasoning - Mental Ability Questions

Select the odd word from the given alternatives.

Pointing to a man in a photograph, Gunjan said, " His mother's only daughter is my mother." How is Ganjan related to that man?

In the following question, select the related letters from the given alternatives.
JQXE : LSZG : : MTNL : ?

Identify the diagram that best represents the relationship among the given classes.
Country, State, City

Pointing towards a girl, Rajan said, she is the daughter of my mother's daughter. Then how is the girl related to Rajan?

Six persons L, M, N, O, P and Q sit in a linear row adjacent to each other facing north. Three persons sit between Q and P. N sits immediate left of Q. Two persons sit between N and M. How many persons sit to the left of M? 

In the following question, by using which mathematical operators will the expression become correct?
27 ? 9 ? 18 ? 24 ? 12

M is son of P, Q is the grand-daughter of O, who is the husband of P. How is M related to O?