Combined Geo-Scientist 2020 Geophysics Paper I Question Paper PDF

Central Government Jobs Other Jobs 2020

  • Year 2020
  • Conducted By UPSC
  • Questions 10
  • Maximum Marks 200
  • Duration Three Hours
  • Languages English

Exam Details

Detail Information
Examination Combined Geo-Scientist (Main) Examination
Year 2020
Conducting Body UPSC
Paper Geophysics Paper - I
Subject Geophysics
Duration Three Hours
Maximum Marks 200
Number of Questions 10
Question Type Descriptive / Subjective

This is the Geophysics Paper I question paper for the UPSC Combined Geo-Scientist (Main) Examination held in 2020. The paper carries a maximum of 200 marks and allows three hours for completion. It consists of ten compulsory questions divided into two sections, with specific instructions for candidates on how to attempt them. This paper is crucial for aspirants preparing for the Geophysics specialization within the Combined Geo-Scientist exam, offering a clear view of the types of descriptive questions asked and the depth of knowledge required.

Major Topics Covered

  • Seismic Moment
  • Moment Magnitude
  • Electric Potential
  • Current Source
  • Homogeneous Medium
  • Heat Flow
  • Earth's Internal Structure
  • Singular Value Decomposition (SVD)
  • Gauss Divergence Theorem
  • Spherical Coordinates
  • Electric Field Intensity
  • Ray Theory
  • Horizontally Stratified Earth
  • Maxwell's Equations
  • Skin Depth
  • Electromagnetic Induction

Why This Paper is Important

  • Useful for Combined Geo-Scientist (Main) Examinatio preparation
  • Helps understand the latest exam pattern
  • Useful for practice and self-assessment
  • Covers frequently asked General Studies topics
  • Helpful for analysing question trends

Related Resources

  • Combined Geo-Scientist (Main) Examination 2020 - Geology Paper I
  • Combined Geo-Scientist (Main) Examination 2020 - Geology Paper II
  • Combined Geo-Scientist (Main) Examination 2020 - Geophysics Paper II
  • Combined Geo-Scientist (Main) Examination 2019 - Geophysics Paper I
  • Combined Geo-Scientist 2020 Geophysics Paper I Answer Key
  • Combined Geo-Scientist Geophysics Syllabus
  • UPSC Geophysics Exam Syllabus
  • Combined Geo-Scientist Exam Pattern

Instructions

  • There are TEN questions divided under TWO sections.
  • Candidate has to attempt SIX questions in all.
  • 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.
  • Neat sketches may be drawn to illustrate answers, wherever required.
  • These shall be drawn in the space provided for answering the question itself.
  • Unless otherwise mentioned, symbols and notations have their usual standard meanings.
  • Assume suitable data, if necessary, and indicate the same clearly.
  • 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 Question-cum-Answer Booklet must be clearly struck off.
  • Answers must be written in ENGLISH only.

Questions (page 2)

Section A

Q1.

(a) An earthquake causes an average of 2.5 m strike-slip displacement over an 80 km long, 23 km deep portion of a transform fault. Assuming that the rock along the fault has an average rupture strength of 175 kPa, estimate the seismic moment (M0) and moment magnitude (Mw) of the earthquake.

(b) Derive the expression for electric potential due to a point current source placed on the surface of a homogeneous medium. Explain with a neat sketch of current flow and equipotential lines.

(c) Explain different sources of heat on the Earth's surface. Show the variation of heat flow with depth within the internal structure of the Earth.

(d) Define Singular Value Decomposition (SVD). Verify the SVD problem for the given rectangular matrix : A = \beginbmatrix 1 & 1 & 0 \\ 0 & 0 & 1 \endbmatrix.

Section A

Q2.

(a) (i) Define Gauss divergence theorem and explain its significance.
(ii) The region r ≤ l in spherical coordinates has an electric field intensity \overlineE = (\rho r)/(3\varepsilon) \overlinear where l is the radius of the spherical volume and \overlinear is the unit vector.
Prove the divergence theorem for the \overlineE field.

(b) Discuss ray theory for horizontally stratified earth and explain how to get velocity of fairly thick layers and series of thin layers.

(c) Using Maxwell's equations, relating the electric and magnetic field vectors, derive the expression for skin depth associated with electromagnetic induction phenomenon.
(Note : Consider the inducing magnetic field is of the form, H = H0 eiω t)

Question paper preview

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Combined Geo-Scientist (Main) Examination 2020 Geophysics Paper I question paper page 1 instructions and header scan PDF download
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Combined Geo-Scientist (Main) Examination 2020 Geophysics Paper I question paper page 1 instructions and header scan PDF download

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Frequently asked questions

What is the name of the examination?

The examination is the Combined Geo-Scientist (Main) Examination.

Which paper is this question paper for?

This question paper is for Geophysics Paper - I.

What is the conducting body for this exam?

The conducting body is UPSC (Union Public Service Commission).

In which year was this examination conducted?

This examination was conducted in the year 2020.

What is the maximum marks for Geophysics Paper - I?

The maximum marks for Geophysics Paper - I is 200.

What is the time duration allowed for this paper?

The time allowed for this paper is Three Hours.

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