Verbal Reasoning - Mental Ability Questions

If in a certain language, STRING is coded as TSIRGN, how is RANDOM coded in that code?

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

XXXXXO, XXXXOX, XXXOXX, XXOXXX, XOXXXX, ?

In the following question, select the related letters from the given alternatives.TRACK : MECTV : : POND : ?

If 16α1 = 8, 14α6 = 42 and 12α5 = 30, then find the value of 2α6 = ?

If 8*2 = 3, 14*18 = -2 and 18*2 = 8, then find the value of 14*10 = ?

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

TER_TE_S_ER_

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

PRQ, TVU, YAZ, ?

Select the related word/letters/number from the given alternatives.
66 : 36 : : 99 : ?