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