IFS (Forests Services) Geology (Mains): Questions 24 - 30 of 31

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Question number: 24

» 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

Note on Chronological order of volcanic events of the Indian Plate, and explanation of causes and manner of Deccan volcanism

Explanation

  • Introduction – Volcanic events of the Indian plate

    Deccan traps are largely made up of lava flows of basic composition. The age of Deccan volcanish produced the longest lava mega – flows on earth, spanning over 1500 km from the main Deccan province across India to “Rajahmundry” an out in the Gulf of Bengal.

  • Cretaceous – Tertiary (K-T) bounda

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Question number: 25

» Geochemistry and Environmental Geology » Pollution of Ground and Surface Water

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Appeared in Year: 2017

Essay Question▾

Describe in Detail

How does the urbanization affect groundwater recharge? How can the recharge be increased? (Mains Paper -2)

Explanation

  • Introduction

    Most of the Earth’s liquid freshwater is found as stored underground in and not in the lakes and rivers. Groundwater plays an important role in terms of the economic and social health of the of the developing world. Cities need to supply water in various combinations as per demands of their private, public, industrial, and commerci

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Question number: 26

» Structural Geology » Principles of Geologic Mapping and Map Reading

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Appeared in Year: 2017

Essay Question▾

Describe in Detail

With the help of case study, describe the methodology for using satellite imagery and GIS to identify potential zones of groundwater. (Paper-1)

Explanation

  • Introduction

    • Groundwater is the source for irrigation and domestic purpose. For domestic purpose – rural areas use and urban areas use . The rate of groundwater flow is controlled by two properties of the rock: porosity and permeability.

    • Remote sensing data combined with Geographical Information System (GIS) t

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Question number: 27

» Paleontology » Application of Microfossils in Correlation

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Appeared in Year: 2017

Essay Question▾

Describe in Detail

Write explanatory notes within 150 words each, on the following

Mineral- walled microfossils and their applications in stratigraphic correlation

Explanation

  • Introduction

    • The study of mineral walled microfossils is called as micropalaeontology.

    • Microfossils the remains of once living bacteria, Protista, plants and animals and ins some cases fragments of larger organisms (Example: Conodonts)

    • These fossils are so small that we need a microscope to study them.

    • Based on their comp

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Question number: 28

» Structural Geology » Joints and Faults

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Appeared in Year: 2017

Essay Question▾

Describe in Detail

Describe unconformities and their types, and give the various criteria to distinguish them from faults.

Explanation

    • Introduction

      When the sedimentary rock beds deposit without any interruptions they are called as conformable. If there are any interruptions in sedimentation then they are called as unconformities.

    • Unconformity

      • Major breaks in sedimentation are called as unconformities. An unconformity is an old erosion surface, which separates younger

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Question number: 29

» Paleontology » Trilobita

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Appeared in Year: 2017

Essay Question▾

Describe in Detail

Tabulate the Palaeozoic stratigraphic successions and their equivalents in Spiti, Kashmir and Kumaon basins of the Himalayas. (Mains Paper -1)

Explanation

  • The Palaeozoic era has been classified into six periods

    • Cambrian

    • Ordovician

    • Silurian

    • Devonian

    • Carboniferous

    • Permian

  • The Palaeozoic rocks of marine origin are found only in the Spiti and Kashmir areas of western Himalayas an in salt range.

Palaeozoic succession of Spiti

Table of Palaeozoic succession of Spiti

Table of Palaeozoic succession of Spiti

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Question number: 30

» Structural Geology » Stress Andstrain Ellipsoid and Stress-Strain Relationships of Elastic

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Appeared in Year: 2017

Essay Question▾

Describe in Detail

How are stress and strain related to each other? Explain the stress – strain curves in terms of brittle, ductile and viscous materials. (Paper-1)

Explanation

  • Stresses applied to a rock mass can be resolved into three mutually perpendicular directions. These directions are called as “axes of stress” and their magnitude is expresses as greatest, intermediate and least. When the magnitude of stress for each axis is equal, the stresses are said to be hydrostatic. Under such stresses, the volume of rock

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