l.
What is Free-air correction in gravity prospecting Why this correction is neglected in magnetic prospecting

Differentiate between normal and formation

pressures in Reservoir Geophysics. If the formation

fluids al 2800 m depth are at a pressure of 400 kg/m^2.Then calculate the over pressure.

Assume formation fluids arc saline in nature with

a density of 1.09 gm/cc.



Describe CDP stacking in seismic prospecting with

a neat sketch. Explain why it is done.


Explain why the measured resistivities in

parallel and perpendicular directions of geological

strata are different. A heterogeneous rock sample

has 1.24 as coefficient of electrical anisotropy. If

the resistivity measured in perpendicular direction of

this strata is 500 Ohm, then what will be the

resistivity parallel to strata

Define Konigsberger ratio. How it is useful in


deciding the rocks of an area are totally dominated

by remanance or induced magnetization


2. Define Eotvos correction. Also explain the role of

ship's heading and velocity in evaluating this

correction. Also calculate the Eotvos correction,

when a ship at a latitude of is heading west

with a speed of 10 knots.


Explain the basic principle used in time-average

equation to determine sonic porosity. What

correction is required to the sonic porosity in a

gas bearing zone





A dip angle electromagnetic survey is carried out
•
along a profile 1 km long. Two thin vertical

conductors of 10 ohm resistivity each are located

at the same depth of 50 m.Also the two conductors

are located at 400 m and 600 m along the profile.

The resistivity of host medium is 1000 ohm and

frequency of measurement is 1000 Hz,..Then draw

the dip angle profile and give the logical

explanation for drawing such anomaly,


3. A series of geophones (marked as I to


placed on the Earth surface at 100 m interval over

a horizontal two layered earth with velocity

V 2000 mis and 3000 mis. The thickness

of the first layer is 500 m. If the first geophone

is placed near the shot point, then find the


nearest geophone from shot point where

refracted wave reaches before the reflected wave.


nearest geophone from shot point where

refracted wave reaches before the direct wave.

refracted wave reaches before the direct wave.




Explain the theory of origin of Self-Potential in

which subsurface anomalous structure acts like a

dry cell. Draw the self-potential anomaly due to

this theory and explain the limitations of this

theory.




4. Distinguish between production and injection wells.

Also explain identification of zones of injection

and production with the help of a flow meter tool.



Differentiate between a conventional magnetic

survey and a magnetic gradient survey. What are

the advantages of magnetic gradient survey


Describe Slingram EM profiling over a 2-D dipping

sheet like body along with its field setup. Mention

the parameters measured and precautions needed

during the survey. Also draw the response curves.


5.
In a Raman scattering experiment, a laser beam


is scattered by diatomic molecules. Obtain an


expression for the Raman shifted frequency in

terms of moment of inertia of each molecule.


Discuss decay of 6C 14 to 7N 14 by P-emission and

calculate how much energy is released in this

process.



Primitive translation vectors of an fee lattice are where a is the Janice constant and i,j and k are unit vectors along the coordinate axes. Find the
reciprocal lattice to the fee lattice.

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Discuss physical significance o f the displacement

current considering a parallel-plate capacitor in a

circuit.



Derive, for a system with many degrees of freedom,
the condition for a quantity p. to be an integral of motion if the Poisson bracket vanishes.




6. What is Franck-Condon principle Discuss the

intensity distribution in the vibrational electronic

spectra of a diatomic molecule on the basis of this

principle.


Use the energy-time uncertainty principle to

estimate the rest mass of a a-meson, whose

exchange leads to nucleon-nucleon interaction, in

terms of range R of the nuclear force. If R 2F.

estimate in units of mc. (Take


Explain why population inversion is not possible

in a two-level laser system.


7. Solve the equation of motion to find out the

nature of trajectory for a charged particle moving in the

plane Z O and placed in a uniform magnetic field

BZ. Also, calculate the rate of change for the

work done by the field.


Using the second London equation,

∇^2 B B/λL^2

where B is the magnetic flux density and A is

the London penetration depth, explain how

Meissner effect is accounted for in superconductors.


An infinitely long straight wire has a uniform linear

charge density. Derive an expression for the etectric

field at a perpendicular distance from the wire.



Consider a rigid body rotating about an axis passing through a fixed point in the body with an angular
velocity co and angular momentum J . Show that
the kinetic energy T of the rotating body is given
by
T


A vector potential is given by

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Calculate the corresponding magnetic field and give

its schematic plot as a function of x.


Find the horizontal component of the Coriolis force

acting on a body of mass 1.5 kg moving northward

with a horizontal velocity of 100 m at 30°N

latitude on the earth.