PSEB/CBSE TERM 2 Physics Model Test paper : 10+2 Physics model test paper -2

PSEB- CBSE TERM -2 MODEL/ GUESS QUESTION PAPER 

CLASS-XII     PHYSICS   TERM-II

Time : 2 Hours       Max, Marks : 35

                                                                       SECTION A

1. The working of optical pipe is based on the phenomenon of ........

2. If the magnifying power of a mirror is +1, then what type of this mirror is?

3. What is the rest mass of a  photon ?

4. How are average life and decay constant are related ?

5. Draw  a diagram of p-n junction with reverse bias.    1*5 =5 

SECTION B

6. What happens to the interference pattern, if the phase  difference between the two sources continuously varies?   Or

The refractive index of glass is 3.0. What is the speed of light in glass? 

7. What is photoelectric effect ? Derive Einstein's photoelectric equation,

8. An electron and proton have same kinetic energy. Which of the two has a greater de-broglie  wavelength. Explain.

Or

Calculate the frequency of a photon, whose energy is 75 eV. Given, 1ev=1.6x 10⁻¹⁹ J and h = 6.62 x 10⁻³⁴ Js. 

Also Read: PSEB MODEL TEST PAPER TERM-2 EXAM 2022

 

9. Write down the laws of radioactivity and define half-life period and find out an expression for it.

10. What is nuclear fission ? Describe a chain reaction

11. In the series of radioactive disintegration of ₉₈X²³⁶ of first an β-particle and then  𝞪 particle is emitted. What is the atomic number and mass number of the new nucleus

formed by these successive disintegrations?

12. Why does the thickness of depletion layer in p-n diode vary with increase reverse bias? Explain

13. Give the difference between  n-type and p-type semiconductors. 

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                                                                                                                                    2*8=16

                                                              SECTION C

14. State and prove prism formula.

                            Or  

The refractive indices of crown and flint glasses for blue and red is 1.523, 1.513 and

1.773, 1.743 respectively. Calculate dispersive powers of two glasses.

15. Derive an expression for total energy of an electron bound to the nucleus of a hydrogen

atom in ground state.

Or

Determine the speed of the electron in the n= 3 orbit of hydrogen atom.

16. Derive an expression for electrical conductivity   of semiconductors.                                                                                                                                             3*3=9

                                                                   SECTION D

17. State Huygen's principle for the propagation of light and prove the laws of reflection of light by using this principle.

Or

What are coherent sources of light? Deduce an expression for the intensity at a point on the screen in Young's double slit experiment.                                                                                                                                                                                1*5= 5