Verbal Reasoning - Mental Ability Questions

In the following question, select the related letter from the given alternatives.
DE : O : : AF : ?

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

ML, HG, CB, ?

A man starts from a point, walks 5 km towards East, turns right and walks 3 km, turns right again and walks. What is the direction he is facing now?

Find the missing number?

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?

M_N_M_MR_R_N

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

EF, K, JK, U, OP, ?

A is to the south­east of B. In which direction is B with respect to A?

Six batteries are kept one above the other. Jumbo is just above Pick. The Volt is between Tank and Ping. Lift is between Jumbo and Tank. Which battery is at second position from the bottom?