Question 5 on the paper is 56 marks and counts for 14% of the overall mark. The choice is to do 8 questions out of 10. It is one of the more popular questions on the paper.
I have compiled a list of all the short questions which have been asked over the last ten years, together with their solutions. It is a detailed document (26 pages) but is worth knowing not only because it prepares you for Question 5, but also because it provides a comprehensive overview of all the topics on the course itself.
I have included the years with the questions because it helps to identify the questions which are particularly popular with the examiners.
State The Principle of Conservation of Momentum.
[2009 OL][2008 OL][2007 OL][2005 OL][2004 OL]
In any interaction between two objects, the total momentum before the interaction is equal to the total momentum after the collision, provided no external forces act.
And to my mind the two most popular questions at higher level:
What is the Doppler effect?
    
The Doppler Effect is the apparent change in frequency due to relative motion between source and observer.
Define electric field strength.
   
Electric field strength is defined as force per unit charge.
There are a lot there so don’t try to learn them all at once; take a couple of pages each day, but then make sure you keep going over them (from the beginning each time) and in no time you’re confidence will be sky high!
Try to print two pages onto one sheet, and also back to back if possible to save paper.