PSEB CBSE TERM-2 EXAM: MODEL QUESTION PAPER PHYSICS 10+2

 PSEB CBSE TERM-2 EXAM: MODEL QUESTION PAPER PHYSICS 10+2 

CLASS--XII                           PHYSICS

TERM-II     Time : 2 Hours                    Max, Marks : 35


Note: 

1. Question paper has total 17 questions.

2. All questions are compulsory.

3. Q.1-5 will carry 1 mark each.

4. Q.6-13 will carry 2 mark each. there will be internal choice in two questions.

5. Q.14-16 will carry 3 mark each. there will be internal choice in two questions.

6. Q 17 will be of 5 marks, there will be internal choice in it.

SECTION A  

1. The phenomenon of splitting up of white light into its constituent colours is called ...... of light.

2. Power of a lens will be more in air than water. (True /False)

3. What is rest mass of photon?

4. What is the principal of nuclear bomb? 

S. What is fermi level? 

SECTION B  

6. What is the critical angle for a material of refractive index  √2

Or

Explain, why white light is dispersed when passing through a prism.

7. Why is wave nature of matter not apparent in our daily observations?

8. Obtain de Broglie equation for a material particle.

Or

Find the momentum of an X-ray photon of wavelength ЁЭЮ┤.

9. Define nuclear force. Give any four properties of nuclear force.

10. Distinguish between Nuclear fission and Nuclear Fusion. 

11. Define atomic mass unit. Show that 1 amu =931.5 MeV.

12. What do you mean by hole in a semiconductor ? Write its three characteristics.

13. What arc the essential characteristics of a semiconductor ?


SECTION C

14. The refractive index of material of an equi-double convex lens is 1.5. What is its focal length? (given radius of curvature R

Q15. Deduce the relation N = N₀ `e^{-╬╗t}`, where symbols have their usual meanings.

OR

Define the term decay constant and half-life of a radio-active sample. Derive a relationship between decay constant and half-life of a radioactive sample.

16. What is rectification ? Explain with the help of a circuit diagram, how a junction diode acts as a full-wave rectifier


SECTION D

17. State new cartesian sign conventions. Derive the expression 


When refraction occurs from rarer to denser medium at convex spherical refracting surface (ЁЭЬЗ₂<ЁЭЬЗ₂)

OR

Derive an expression for the refractive index of the material of a prism in term angle of prism and the angle of minimum deviation


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