class 12 physics question bihar board

Q.1. With the help of block diagram explain the working of a fibre optic communication link. Ans ⇒…

Q. 1. What is energy ? Distinguis between conductor, semiconductor and insulator on the basis of…

Q.1. (i) Find the energy released in the nuclear reaction A = B + C + D the binding energies of A, B, C and EA,…

11. DUAL NATURE OF MATTER AND RADIATION Q.1. What is the photoelectric effect and how did Einstein explain…

10. WAVE OPTICS Q.1. Derive an expression for angular fringe width in Young double-slit experiment. Ans ⇒…

9. RAY OPTICS AND OPTICAL INSTRUMENTS Q.1. What is total internal reflection ? Explain its two applications.…

Q. 1. What are electromagnetic waves ? Describe their properties. Describe electroma gnetic spectrum.…

Q.1. Discuss LCR circuit with phaser diagram. Ans ⇒ LCR circuit with phaser diagram : In this…

Q.1. (a) Lenz's law obeys the law of conservation of energy. Explain. (b) Describe construction & working…

Q.1. Distinguish among dia, para and ferromagnetic substance. Ans ⇒ S.N Diamagnetic Substances…