Verbal Reasoning - Mental Ability Questions

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

P_QR_QQ_PQ_R

The ratio of the present ages of Shreya and her husband is 8 : 9. 9 years from now, ages of her husband and her son will be in the ratio of 9 : 4. If the present age of Shreya is 56 years, then what will be her son’s present age (in years)?

In the following question, select the odd word pair from the given alternatives.

Find out the odd word/letters/number/number pair from the given alternatives.

Select the related word from the given alternatives.
Cotton : White :: Coal : ?

If "A" denotes "added to", "C" denotes "divided by", "D" denotes "multiplied by" and "B" denotes "subtracted from", then 72 C 9 D 2 B 6 A 10 = ?

If "*" denotes "added to", "&" denotes "divided by", "@" denotes "multiplied by" and "%" denotes "subtracted from", then 399 & 19 @ 21 % 41 * 100 = ?

In the following question, select the odd word from the given alternatives.