1. What name is given to a device for coupling and uncoupling rotating shafts, as in a car’s transmission system?
2. In the traditional sequence of colours in a rainbow, what comes between blue and violet?
3. Which Premier League club recently sacked manager Jesse Marsch less than a year after he was appointed?
4. In what year did the Syrian civil war begin?
5. What is the only native venomous snake in Britain?