Most repeated and important topics of 12th physics, chemistry and biology
![Image](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgkUS-BY5KVxunGgPbCVyCujwoMBMz1Ed46bhGWCnvV5RGyi6mcXwcgtRT1zvLBr0oaawDu8wx8TEWOG4ryV9BAVM2gvi1ciWiF7BCbmJFV-7nH-Zl7ew_8Z0glLZSvVzNUcfhOWo6SAsNj/s1600/1674407689561747-0.png)
How to get 90% in board exam?🤘😇 Author: scientificirfan * Current in a circuit is somewhat analogous to the flow of water in a closed system of pipes,with gravity playing the role of the electrostatic field,and a pump(motor) as a role of battery. In this sense, height is analogous to voltage. Most important and most repeated topics in BSEB/CBSE 12th Physics: 1. Biot-Savart law 2. Young's double slit experiment 3. Lens maker formula 4. Gauss' law of electrostatics 4. PN junction and zener diode 5. Theory of microscope and telescope 6. Logic gate and truth table 7. Huygens' theory 8. Ampere's circuital law 9. Radioactivity 10. Mutual induction and inductor 11. Wheatstone bridge 12. Potentiometer 13. Refraction at spherical surfaces 14. Electric dipole (potential and field) 15. Defects of vision and its corrections 16. Parallel plate capacitor 17. Bohr's model of the atom 18. Types of magnetic substances 19. Total internal reflection and rainbow 20. E