IFS (Forests Services) Geology (Mains): Questions 9 - 15 of 31

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Question number: 9

» Geomorphology and Remote Sensing » Applications of Geomorphology in Mineral Prospecting

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Appeared in Year: 2017

Essay Question▾

Describe in Detail

Discuss the evidences of seafloor spreading and explain with illustrative diagrams, how earthquakes and subduction processes are related to each other.

Describe the components and working principles of (i) cross track scanners and (ii) RISAT

Explanation

Introduction

  • Cross track scanners

    Cross track is also known as whiskbroom scanner. Here rotating or oscillating mirror is used to scan the terrain in a series of line called scan lines, which are perpendicular to the flight line. As the aircraft or the platform moves forward, successive line are scanned giving a series of contiguous narrow stri

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Question number: 10

» Paleontology » Petroleum Exploration

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Appeared in Year: 2017

Essay Question▾

Describe in Detail

Briefly describe organic walled microfossils. Discuss their applications in petroleum exploration.

Explanation

  • Introduction

    • The study of organic walled microfossil is called as palynology. Microfossils comprises of remains of living bacteria, protists, plants and animals. These fossils are so small that we need microscope to study them. Based on their shell composition, microfossils are classified into,

    • Non – mineralized (organic walled) and mine

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Question number: 11

» Stratigraphy and Geology of India » Classification of Stratigraphic Sequences » Lithostratigraphic

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Appeared in Year: 2017

Essay Question▾

Describe in Detail

Define Lithostratigraphy and comment on the criteria for lithostratigraphic classification and description of various rank terms.

Explanation

Introduction

  • Lithostratigraphy is the classification and correlation of rocks based on their physical characteristics like grain size, composition, colour, fossil content and by their inter-relationships with adjacent units.

  • In regions with different kinds of geological history, the boundary of geological time scale does not coincide with

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Question number: 12

» Structural Geology » Folds and Faults Classification and mechanics.Structural Analysis of Folds

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Appeared in Year: 2017

Essay Question▾

Describe in Detail

Classification of folds on the basis of orientation of axial plane (Mains Paper -1)

Explanation

Classification of folds

  • Symmetrical folds

    Two limbs dip at the same angel but in opposite directions. In this case the axial plane is vertical and it passes through the crest or trough

  • Asymmetrical folds

    Here the limbs dip at unequal angles in opposite directions. In this case the axial plane is inclined and it not necessarily passes through

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Question number: 13

» General Geology » Continental Drift-Evidences and Mechanics » Plate Tectonics

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Appeared in Year: 2017

Essay Question▾

Describe in Detail

To explain about the continental drift evidences and tectonic plate movements.

Explanation

  • Introduction

    • Continental drift refers to the horizontal movement of the continents on a vast scale.

    • Continental land – composed of sial

    • Ocean floor – composed of sima

  • Geological and Paleontological evidences

    • Continental Boundaries East coast of South America matching with the west coast of Africa.

    • They fit like part

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Question number: 14

» Hydrogeology and Engineering Geology » Salt Water Intrusion

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Appeared in Year: 2017

Essay Question▾

Describe in Detail

Write Note on: Ghyben – Herzberg relationship

The saltwater and underground freshwater are analysed through hydrostatic equilibrium using Ghyben – Herzberg relationship

Explanation

  • Introduction

    Salt-water intrusion or encroachment is the movement of Saltwater into underground sources (aquifers) of freshwater which can occur in coast regions or inland and the surgace movement of saltwater inland from the coast.

  • Aquifers

    • Permeable rock formations that store underground and transmit sufficient quantity of it to pumpin

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Question number: 15

» Stratigraphy and Geology of India » Classification of Stratigraphic Sequences » Paleogeography and Igneous Activity in the Indian Subcontinent

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Appeared in Year: 2017

Essay Question▾

Describe in Detail

Palaeogeographic reconstruction of India during Gondwana times, using suitable diagrams.

Explanation

Introduction

With the breakup of Gondwana, India began to disintegrate into a smaller plate, becoming partially isolated during the Early Cretaceous period.

Image of Biotic Filter Bridge

Image of Biotic Filter Bridge

Image of Biotic Filter Bridge

  • Biotic Filter Bridge

    A biotic link between India and Africa retained because, the Indian plate collided with the Kohistan – Lad

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