Verbal Reasoning - Mental Ability Questions

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

RTM, QRJ, PPG, OND, ?

In the following question, select the related letters from the given alternatives.
JPSW : LQUX : : MRFT : ?

'Car' is related to 'Garage' in the same way as 'Hen' is related to ___.

Select the related word/letters/number from the given alternatives.
DI : M : : CR : ?

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?

50 + 3 ÷ 125 x 5 - 25 = ?

Introducing a girl, Pooja says, "Her mother's son is the nephew of my father". How is the girl related to Pooja?

Pointing towards a lady in a photograph, Sushma says, "She is the mother of my grandfather's son". How is Sushma related to the lady in the picture?

In the following question, select the related word from the given alternatives.
Mathematics : Formulas : : Chemistry : ?