Verbal Reasoning - Mental Ability Questions

Which one set letters when sequentially placed at the gaps in the given letter series shall complete it?

M__OMMN__M__NOMMN__M

In the following question, select the related word from the given alternatives.
Kilometre : Metre : : Tonne : ?

A is D's brother. D is B's father. B&C are sisters. How is C related to A?

If 8 θ 12 δ 6 = 60 and 13 θ 15 δ 11 = 74, then 18 θ 21 δ 15 = ?

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

If "+" denotes "divided by", "x" denotes "added to", "÷" denotes "subtracted from" and "–" denotes "multiplied by", then
54 + 162 – 18 x 12 ÷ 6 = ?

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_

Rajaram's son's sister's mother is Ramani. How is Ramani related to Rajaram?