Combined Geo-Scientist 2022 Geo-Physics Paper I Question Paper PDF

Central Government Jobs Other Jobs 2022

  • Year 2022
  • Conducted By UPSC
  • Maximum Marks 200
  • Duration Three Hours
  • Languages English

Exam Details

Detail Information
Examination Combined Geo-Scientist (Main) Examination
Year 2022
Conducting Body UPSC
Paper GEO-PHYSICS Paper I
Subject Geo-Physics
Duration Three Hours
Maximum Marks 200
Question Type Mixed

This document contains the official question paper for the Combined Geo-Scientist (Main) Examination 2022, specifically for Geo-Physics Paper I. Conducted by UPSC, this paper is designed to assess candidates' in-depth knowledge of Geo-Physics. It allows a duration of three hours and carries a maximum of 200 marks. The paper is structured into two sections, with specific compulsory questions and a requirement to attempt a balanced number from each section. This paper is a crucial resource for aspirants preparing for the Geo-Scientist examination, providing insights into the types of questions, marking scheme, and subject coverage.

Major Topics Covered

  • Geomagnetic fields
  • Earth's magnetic fields
  • Bulk modulus
  • Poisson's ratio
  • Body waves velocity
  • Vp and Vs
  • Electric and magnetic fields
  • Electromagnetic equations
  • Isotropic homogeneous medium
  • Eigenvalues and eigenvectors
  • Matrix
  • Reference spheroid
  • Geoid
  • Ray parameter
  • Seismology
  • Horizontal and vertical slowness
  • Homogeneous three-layer model
  • Surface to surface distance
  • Travel time
  • Least square solution
  • Linear inverse problem
  • Model parameter
  • Data vector
  • Data kernel

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 2022 Geo-Physics Paper II
  • Combined Geo-Scientist (Main) Examination 2021 Geo-Physics Paper I
  • Combined Geo-Scientist (Preliminary) Examination 2022 Geo-Physics Paper
  • Combined Geo-Scientist (Main) Examination 2022 Geo-Physics Paper I Answer Key
  • Combined Geo-Scientist (Main) Examination Syllabus
  • Geo-Physics Syllabus for UPSC Exams
  • Combined Geo-Scientist (Main) Examination Pattern
  • UPSC Exam Pattern for Geo-Scientist

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) Using suitable sketch, draw the elements of geomagnetic fields. Also show the relation between different components of earth's magnetic fields.

(b) Define Bulk modulus K for isotropic solid. Derive the expression of computing Poisson's ratio σ using body waves velocity Vp and Vs. Give the relationship between Vp and Vs for Poisson solid. What is the dimension of Poisson ratio ? Compute (Vp)/(Vs) for a rock with Poisson's ratio of 0.

(c) Using a suitable sketch show the relation between electric and magnetic fields. Derive electromagnetic equations for propagation of electric and magnetic field vectors in an isotropic homogeneous medium having conductivity σ, relative permeability μ, and relative - dielectric permittivity \epsilon.

(d) What do you understand by eigenvalues and eigenvectors? Determine the eigenvectors of the matrix A = \beginbmatrix 2 & 1 & 0 \\ 0 & 2 & 1 \\ 0 & 0 & 2 \endbmatrix

Section A

Q2.

(a) What do you mean by reference spheroid and geoid. Explain with the help of a suitable sketch.

(b) Define ray parameter in seismology and its relation to horizontal and vertical slowness. Consider a homogeneous three-layer model with 3 km thickness each and velocities 4, 6 and 8 km/sec for the top, middle and bottom layers, respectively. What is the surface to surface distance and travel time for a ray with P = 0.15 s/km given below two equations (1) and (2).
X(P) = 2P sumi (\Delta Zi)/(ui2 - P2
ight)1/2) ui > P qquad - (1)
and
T(P) = 2 sumi (ui2 Delta Zi)/(ui2 - P2
ight)1/2), ui > P qquad - (2)

(c) Write an expression for a least square solution of a linear inverse problem \underlined = \underlineG \underlinem; where m is model parameter, d represents the data vector and G is data kernel. Use the expression to solve the following for m1 and m2.
m1 = 1
m2 = 2
m1 + m2 = 2

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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 Geo-Physics Paper I.

What is the conducting body for this exam?

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

What is the maximum marks for Geo-Physics Paper I?

The maximum marks for Geo-Physics Paper I is 200.

What is the time allowed to complete the paper?

The time allowed to complete the paper is Three Hours.

In which year was this examination conducted?

This examination was conducted in the year 2022.

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