One thing thats gonna come is:a student gives an opinion and your gonna have to evaluate his/conclusions. And imo thats the most irritating type of question.
Before sitting for the exam do revise the typical 5 marks questions like:
-DC motor
-Transformers
-how to measure and use background radiation
-experiment to find refractive index
-conduction and convection
-the 3 mark pressure question(asked every year)
-terminal velocity
How seatbelt or crumpled ones protect user from severe injury.
-experiment to measure speed of sound
-ticker tape experiments to investigate acceleration and speeds
These are the most common big descriptive questions,if i missed anything do tell me please.