class 12th physics subjective question answer

15. COMMUNICATION SYSTEMS Q.1. Explain the following terms : (i) Ground waves (ii) Sky waves (iii) Space…

14. SEMI CONDUCTOR ELECTRONICS : MATERIALS, DEVICES & SIMPLE CIRCUITS TILE Q.1. Distinguish between an…

13. NUCLEI Q.1. Define binding energy of a nucleus. Ans ⇒ It is defined as the amount of work done to…

12. ATOMS Q.1. State Bohr's frequency condition. Ans ⇒ It states that the frequency v of a radiation…

11. DUAL NATURE OF MATTER AND RADIATION Q.1. Draw the graphs showing the variations of photo-electric…

10. WAVE OPTICS Q.1. Two electric lines of force cannot intersect each other. Why ? Sketch the lines of…

9. RAY OPTICS AND OPTICAL INSTRUMENTS Q.1. (a) When a low flying aircraft passes overhead, we sometimes…

8. ELECTROMAGNETIC WAVES Q. 1. State the principle of production of em waves. Ans ⇒The accelerated charge…

7. ALTERNATING CURRENT Q.1. What are advantages and disadvantages of a.c. over d.c. ? Ans ⇒ Advantages of…

6. ELECTROMAGNETIC INDUCTION Q.1. What are the advantages or application of eddy currents ? Ans ⇒ …