Verbal Reasoning - Mental Ability Questions

Pointing towards a girl, Chetan said "She is the daughter of the only child of my grandmother". How is Chetan related to that girl?

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

Amar moved 20km towards east in car from his home to reach hospital. From there he turned left and moved 30km and again move 20km left to reach his school. How far is his school from hospital?

If PONDERS is coded as ONCDQR, then how will MAT be coded as?

Raju walks 4 km towards East. Then. he turns left and walks another 3 km. In which direction and at what distance is he from his initial position?

In the following question, select the related number from the given alternatives.
243 : 578 : : 163 : ?

If 9@7=4; 6@1=10; 7@4=6; then what is the value of 8@2=?

If MARBLES is coded as PDUEOHV, then how will GIN be coded as?