Jkbose 12th class physics paper download PDF , physics paper jk Bose

Jkbose old paper of class 12th PDF downloads physics paper

PHYSICS .

Times :  3 Hours + 15 Minutes extra to read the question paper   [Maximum Marks : 70   

    

       (Long AnSWer Type Questions)

1. Define an Electric  Dipole. Derive an expression for tor e acting on an electric  dimle in a uniform electric field.

                                      Or
Datine capacitance of a conductor and derive an expression for the energy stored in a capacitor.                                             5

2. What is Cyclotron? Discuss its construction, working and  theory.

                                      Or
What are dis, para and ferromagnetic materials ? Discuss their important properties.                                        5

3. What is meant by root mean square value of ac. ? Derive an expression for r.m.s. value of alternating current.

                                            0r

Give the rinciple, construction, theory and working of ac.  generator

4. State Huygen’s Principle. Prove laws of reflection on the basis of Huygen's principle

                                                                        5

                                           Or

Deseribe a compound microscope, Deduce an expression tor its magnifying power. 5

     

   (Short Answer Type Questions) 5 State  

5. state ohm's law and deduce lt trom the knowledge of drift velocity

6 Explain how a Wheatstone bridge is used to measure unknown resistance

7. Write any six characteristics of electromagnetic waves.         

8. in Young's double slit experiment, a screen is placed 1•5  m away from slits which are 003 cm apart. The distance between the central bright fringe and fourth bright fringe is 1 cm. Calculate the wavelength of light used.                           3

9. The sun looks reddish at the time at sunrise and sunset. Why ?

10. Explain the dual nature of radiations. 3 "

11.  Explain ”that transistor ~can be used as a switch.

12. Discuss briefly how amplitude modulated wave is produced ?            3

{Very Short Answer Type Questions)

13. An electric dipole consists of a positive and negative charge of 5 u C each placed at a distance of 7 mm. Calculate the
dipole moment 2

14 What is the main function of soft iron core used in a moving corl galvanometer .

15 What ts the po r dissipation in an ac. circuit in which, voltage and current are given  'by V=300 Sin [wt+-:-] and

1= 5 Sin  w t ?