Variable Resistors: Potentiometer, Preset & LDR: Sequential glowing of LEDs, Internal structure of potentiometer/preset, Working of LDRģ. Verification of Kirchhoff Laws and Ohms LawĢ. Here is the list of topic based projects for class 12:ġ. Using step-by-step visual instructions & detailed theory manual, you can make your physics investigatory project within hours & score 100% marks in practical. Hey! If you are a class 12 student and looking for physics investigatory projects, do not miss CoolJunk DIY(do-it-yourself) physics kits: CoolJunk Physics Investigatory Project Kits