Code-16
PHYSICS Time: 3 Hours.
Maximum Marks: 150
Note: Attempt Five questions in all. All questions carry equal marks i.e. 30. Q. No.1 is compulsory. Answer two questions from Part I and two questions from Part II. The parts of the same question must be answered together and must not be interposed between answers to other questions.
Q.No.1. Write critical notes on any four of the following: X

Precession of a top


Joule-Kelvin effect


Ruby laser


Poynting vector


Compton effect


Logic gates


PART-I
Q.No.2. Distinguish between streamline and turbulent flow ofa liquid. Water flows through a horizontal pipe having a tapering bore. The velocity of water is 2 m/sec. at the broader end and the pressure is 1 kilo-newtonlm2• less at the narrow end. What is the velocity of water at the latter end?
(b)What is impact factor parameter? Obtain an expression for the differential scattering cross-section in the case of a­particle striking a thin gold foil and undergoing elastic collisions.
Q.No.3. Show that
Cp -Cv=TEa 2V
Where T is the absolute temperature, E is the isothermal bulk
modulus, a is coefficient of volume expansion and V is the
specific volume.
Give the various thermodynamic potentials and deduce the
PTO.
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following Maxwell's equations:


The probability function that a molecule can have its velocity components along x-axis is:
p (vJ y!2e-ni1/
Using this expression find the value of for which the probability falls to
times, times of the maximum value.
Q.NoA.(a) The total energy of a particle executing a simple harmonic motion of period 2n sec. is l0240 ergs. After n/6 sec. the particle passes the mid point of the swing, its displacement is 8 cm. Calculate the amplitude of the
motion and the mass of the particle.

Distinguish between Fresnel and Fraunhofer classes of diffraction. Give an account of the diffraction effects produced


What is Raleigh's Criterion for resolution and also explain resolving power of grating?


by a slit. Explain what happens when the slit width is
gradually increased and also when the screen is gradually
moved away from the slit.


PART-II
Q.No.5.(a)Write down Laplace's equation in spherical coordinate and use it to obtain potentials inside and outside a dielectric sphere in a uniform field.
Distinguish between the characteristic features of
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ferromagnetism, anti -ferromagnetism and ferrimagnetisms. Give an example of each type of materials. Comment on the temperature variation of susceptibility for all types of
materials.
Q.No.6.(a)What are f3 and y rays? Describe their characteristic properties?
nucleon (neutron or proton) is confined to nucleus of radius 5 x 1Ol'meters. Calculate the minimum uncertainty in the momentum of the nucleon. Also calculate the minimum kinetic energy of the nucleon.
What is the photo-electric effect and how did Einstein
explain it? For photo-electric emission establish the Einstein equation


Symbols are in their usual meanings.
Q.No.7.(a)What is Zener diode? Explain the avalanche and Zener breakdown mechanisms. How can Zener diode be used to stabilize the voltage?
(b)What is Energy band? Distinguish between a metal, semiconductor and an insulator on the basis of band theory.

(c)Describe the working of a full-wave rectifier with capacitor filter and derive an expression for the ripple factor.
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