Loyola College B.Sc. Physics April 2008 Geo Physics Question Paper PDF Download

LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

FG 18

 

FIFTH SEMESTER – APRIL 2008

PH 5400 – GEO PHYSICS

 

 

 

Date : 03/05/2008                Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

 

PART-A                                                     10 X 2 = 20

Answer all questions

 

  1. What is meant by phases in seismic waves?
  2. What is a shadow zone?
  3. Give the significant differences between body wave and surface wave.
  4. Express Adams and Williamson equation for the variation of density with depth.
  5. Define the terms epicenter and focus of an earthquake.
  6. Write down the Laplace’s and Poisson’s equation obeyed by the gravitational potential.
  7. Explain briefly the Gauss method of determining the earth’s magnetic field.
  8. What are the prediction for the composition of the core from shock wave measurements?
  9. Give the decay schemes of the radio nuclide K40.

10 .List the two possible sources of heat within the earth.

 

 

PART-B                                                                4 X 7.5 = 30

Answer any four questions

 

  1. What are P and S waves? Describe the method by which the epicenter of an earthquake is located.
  2. Outline the principle and construction of the strain seismograph.
  3. Give an account of the Richter Scale of magnitude for earthquakes.
  4. Describe the quantitative investigation for an equation of state of the mantle
  5. Discuss the variation of temperature within the earth.

 

 

PART-C                                                            4 X 12.5 = 50

Answer any four questions

 

  1. Discuss the analogy between an optic wave and a seismic wave in terms of reflection

and refraction phenomenon.

  1. Obtain the Seismograph equation for a horizontal seismograph and deduce the two

types of instrumentation that follows the equation.

  1. Explain the working of i)Hammond and Faller method (of measuring gravity) and

ii)Worden gravitymeter with neat diagrams.(6+6.5)

  1. Explain the theory of i)saturation magnetometer and ii)Alkali vapour magnetometer(5+7.5)
  2. a) Discuss the flow of heat to the surface of the earth from the core.
  3. b) Discuss the source of heat within the earth.

 

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