Geo-Physics Paper I 2017

Central Government Jobs Other Jobs 2017

  • Year 2017
  • Questions 10
  • Maximum Marks 200
  • Duration Three Hours Maximum Marks: 200
  • Languages English & Hindi

Exam Details

Detail Information
Examination Geo-Physics
Year 2017
Paper Paper I
Subject Geophysics
Duration Three Hours Maximum Marks: 200
Maximum Marks 200
Number of Questions 10
Question Type Mixed

Geo-Physics Paper I (2017) document contains the exam header, instructions, and the maximum marks (200) for a three-hour paper. It specifies ten questions divided into two sections, with questions 1 and 6 compulsory and a total of six questions to be attempted. Page 2 provides Section A with descriptive sub-questions (1–5) covering planetary origin theories, earthquake magnitude scales, generalized least squares, Maxwell's equations, radioactive dating, decay constant, P-shadow zone, Bouguer anomalies, receiver functions, hypocenter/epicenter, Benioff-Wadati zone, under/overdetermined problems, geomagnetism, seismometers, broadband seismographs, velocity anomalies, travel-time curves, and condition numbers. The material bridges theoretical concepts with practical geophysics applications such as gravity anomalies, seismic waves, and inversion techniques.

Major Topics Covered

  • origin of solar system
  • geophysics
  • earthquake magnitude scales
  • seismic wave theory
  • Maxwell's equations
  • radioactive dating
  • geophysical methods
  • gravity anomalies
  • Free-Air and Bouguer gravity
  • hypocenter and epicenter
  • Benioff-Wadati zone
  • receiver Functions
  • seismometer vs accelerometer vs displacementmeter
  • Broadband seismograph
  • velocity structure of the Earth
  • travel-time curves
  • high/low velocity zones
  • inverse problems
  • condition number
  • normal matrices

Why This Paper is Important

  • Useful for Geo-Physics preparation
  • Helps understand the latest exam pattern
  • Useful for practice and self-assessment
  • Covers frequently asked General Studies topics
  • Helpful for analysing question trends

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Instructions

  • ण विज्ञान परीक्षा वियोज्य DETACHABLE GEOLOGIST EXAM-2017 GEO-PHYSICS Paper I Time Allowed: Three Hours Maximum Marks: 200 OUESTION PAPER SPECIFIC INSTRUCTIONS Please read each of the following instructions carefully before attempting the questions. There are TEN questions divided under TWO Sections. Candidate has to attempt SIX questions in all. Questions No. 1 and 6 are compulsory. Out of the remaining EIGHT questions, FOUR questions are to be attempted choosing TWO from each Section. The number of marks carried by a question/part is indicated against it. Attempts of questions shall be counted in sequential order. Unless struck off, attempt of a question shall be counted even if attempted partly. Any page or portion of the page left blank in the answer book must be clearly struck off. Answers must be written in ENGLISH only. Neat sketches may be drawn to illustrate answers, wherever required. Unless otherwise mentioned, symbols and notations have their usual standard meanings. Assume suitable data, if necessary and indicate the same clearly.

Questions (page 2)

Q1. (b) Define "magnitude" of an earthquake and its various scales of measurements.

(a) 1. Give brief account of characteristics of planets which must be satisfied by the theories propounded for the origin of solar system.
1.

(b) Define "magnitude" of an earthquake and its various scales of measurements.

(c) Write an empirical relation between magnitude and intensity.
1. Write the Maxwell's equations for free space in differential and integral form.
1.

(d) Discuss the principle of radioactive methods of determining age of the earth by

  • (b) Define "magnitude" of an earthquake and its various scales of measurements.
  • (c) Write an empirical relation between magnitude and intensity.

Q2. (b) Explain P-shadow zone in a standard earth model. List any three seismic phases which are observed in the P-shadow zone.

(a) 2. defining decay constant (λ) and half life.
2.

(b) Explain P-shadow zone in a standard earth model. List any three seismic phases which are observed in the P-shadow zone.

(c) Draw the travel path of the listed seismic phases.
2. Bouguer anomalies observed over mountain ranges which are isostatically compensated and uncompensated respectively.

  • (b) Explain P-shadow zone in a standard earth model. List any three seismic phases which are observed in the P-shadow zone.
  • (c) Draw the travel path of the listed seismic phases.

Q3.

(a) 3. Write short note on Receiver Functions.
3.

(b) Define 'hypocenter' and 'epicenter' of an earthquake and classify earthquakes on the basis of focal depths. Explain the Benioff-Wadati zone with a figure.
3.

(c) Explain underdetermined, overdetermined, mixed determined and even determined problems with an example for each.

Q4. (b) Explain the differences between seismometer, accelerometer and displacementmeter.

(a) 4. Explain the earth's magnetic field. Explain geomagnetic storms and their effects.
4.

(b) Explain the differences between seismometer, accelerometer and displacementmeter.

(c) Write short note on 'Broadband seismograph'.
4. Explain using travel time versus epicentral distance plots, how a high velocity zone and a low velocity zone in the earth are identified.

  • (b) Explain the differences between seismometer, accelerometer and displacementmeter.
  • (c) Write short note on 'Broadband seismograph'.

Q5.

(a) 5. earthquake. Explain the factors leading to uncertainties in the location of hypocenters.
5.

(b) List in a tabular form the geophysical and geological characteristics of a typical oceanic and a stable continental crust.
5.

(c) Define the condition number for a normal matrix. Explain a well-conditioned and an ill-conditioned matrix. Explain the trade off of resolution and variance with a figure.

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Frequently asked questions

Q1: How many questions must a candidate attempt in Geo-Physics Paper I 2017?

A: Six questions in total; Question 1 and 6 are compulsory; out of the remaining eight, four must be attempted by selecting two from each section.

Q2: In what language should answers be written?

A: Answers must be written in English.

Q3: Are sketches allowed in the answer booklet?

A: Yes, neat sketches may be drawn where required.

Q4: What is the duration of the Geo-Physics Paper I?

A: Three hours.

Q5: What is the maximum marks for the paper?

A: 200 marks.

Q6: What topics are covered in Page 2 Section A?

A: Topics include magnitude of earthquakes, P-shadow zone, Bouguer anomalies, Receiver Functions, hypocenter/epicenter, Benioff-Wadati zone, seismometers, Broad-band seismograph, seismic velocity structure, travel-time plots, and inversion concepts.

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