LNMU B.SC physics part 1 questions download for free ~ LNMU Notes

 

Download LNMU b.sc physics part 1 2020 questions for free

PHYSICS  PAPER - 2  PART 1 2020

FUL MARKS : 75                       PAPER – 2   

PASS MARKS : 34

LNMU B.SC QUESTIONS DOWNLOAD | B.SC PHYSICS Part 1 2020

 Answer any five questions, selecting two from each group, in which Q.no. 1 is compulsory.

1. Give an account of  any three of the following.

         (5 marks each).

a)   (a) What is meant by electric field intensity and potential ? Establish the relation*( same question, from 2018)

b)   (b) What is meant by mean  free path of molecule of a gas ? How mean free path depends upon the diameter of gas molecule ?

c)  (c)  State Amper’s circuital law and deduce it from Biot-Savart-Laplace law.*( same question, from 2018)

d)   (d)  Distinguish between isothermal and adiabatic process. Deduce adiabatic relation P,V and T for ideal gas.* (same question, from 2018)

e)    (e) What is electromagnetic induction ? State and explain Faraday’s law of electromagnetic induction.

f)    (f)  What is black body radiation ? Explain the terms emissive and absorptive powers.

                 

 GROUP – A  (15 marks each)

2. Obtain Maxwell’s law of distribution of velocity for the molecule of gas within velocity range C and C + dC. *( same question, from 2018)

3. Define thermal conductivity and electrical conductivity. Obtain Weidman-Franz law for the thermal and electrical conductivity of metal. *( same question, from 2018)

 

4. On the basis of thermodynamic considerations, explain Stefan-Boltzmann law of radiation.

5. What is Joule-Thomson effect ? Obtain thermodynamically an expression for Joule-Thomson cooling.

            GROUP – B

6. What do you understand by Dielectric Polarisation and Electric Displacement vector ? Show that 

where the symbols have their usual meanings.

7.  Explain Biot – Savart  law. With its help derive an expression for the magnetic field at any point on the axis of a current carrying circular loop. ( similar to 2018 )

8.  what is Laplace’s equation ? Give the solutions of this equation in cartesian co-ordinates. *( same question, from 2018)

9. Discuss the boundary conditions at the surface of separation of the two dielectric and hence explain the refraction of lines of force.

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