class 12 physics question bihar board

• 15. COMMUNICATION SYSTEMS (Long Answer Type Question)

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

• 14. SEMI CONDUCTOR ELECTRONICS : MATERIALS, DEVICES & SIMPLE CIRCUITS (Long Answer Type Question)

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

• 13. NUCLEI (Long Answer Type Question)

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

• 11. DUAL NATURE OF MATTER AND RADIATION (Long Answer Type Question)

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

• 10. WAVE OPTICS( Long Answer Type Question )

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

• 9. RAY OPTICS AND OPTICAL INSTRUMENTS( Long Answer Type Question )

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

• 8. ELECTROMAGNETIC WAVES ( Long Answer Type Question )

Q. 1. What are electromagnetic waves ? Describe their properties. Describe electroma gnetic spectrum. Ans ⇒ Electromagnetic waves :…

• 7. ALTERNATING CURRENT ( LONG ANSWER TYPE QUESTION )

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

• 6. ELECTROMAGNETIC INDUCTION( LONG ANSWER TYPE QUESTION )

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

• 5. MAGNETISM AND MATTER( LONG ANSWER TYPE QUESTION )

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