Name The Year: George H. Gallop, pollster (what's your opinion?)?

Questions

Which Roman emperor was reputedly poisoned by his wife Agrippina?

Ruthin is in which now restored Welsh county?

In Coronation Street, who has been revealed as the father of Ashley Peacock?

What was the nationality of the composer Cesar Franck?

In Mathematics what name is given to a pair of angles whose sum is 90 degrees?