They will ask basic question like concept of electric field and what is a rectifier and all.
For chemistry they asked me from organic part like how would you distinguish between two compounds by giving a chemical test.
There is an exhaustive list of such tests. KL Chug has ample amount of examples to at the end of its book in the appendix to deal with them like a boss. You may want to practise a little to gain some mastery. It will take around an hour and a half if you are familiar with the basics.
And then if they choose to question you from analytical part, I have no idea. They will prolly ask basic stuff if no one hurts their ego.
Relax buddies. Just meet the lab assistant way before time and he will tell you what experiments are going to be conducted. You just flip through your experiments on the lab manual (theoritically would be my preference)