Verbal Reasoning - Mental Ability Questions

A boy and a girl are playing in a park. The only daughter of the maternal grandfather of the girl, is the sister of the boy's father. How is the boy related to the girl?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

DJO, EKP, FLQ, GMR, ?

In these questions, the relationship between two elements is shown in the statements. These statements are followed by two conclusions.
Statement: X = M < A < S = T < R

Conclusion:
I. M = T
II. R > A

Abhinav travels 10 km north then turns left. Then he travels 6 km and turns right and cover another 7 km. He finally turns to right and travels another 6km. How far (in km) is he from the point of starting his journey?

If 15@7=44; 5@4=18; 6@17=46; then what is the value of 17@4=?

In a certain code language, “MAGNET” is written as “WHQJDP”. How is “FRAUDS” written in that code language?

Select the related number from the given alternatives.
77 : 84 :: 121 : ?

In a certain code language, “CUDGEL” is written as “FYGKHP”. How is “DAINTY” written in that code language?