IFS (Forests Services) Geology (Mains): Questions 8 - 11 of 63

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Question number: 8

» Hydrogeology and Engineering Geology » Engineering Properties of Rocks

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Appeared in Year: 2017

Essay Question▾

Describe in Detail

Discuss the geological history of Trilobites with specific description of the abundance, decline and extinction of the group through the Palaeozoic Era. (Geology optional – paper 1)

b) Give a detailed account of the field and laboratory tests carried out to determine the engineering properties of rocks.

To explain the field and laboratory tests carried out to determine the engineering properties of rocks.

Explanation

Field test to determine engineering properties of rocks

  • Mechanical behaviour of rock cannot be determined from laboratory tests. Hence, field tests are carried on to estimate the properties of rock mass.

  • The type and number of insitu tests depends upon the structure and the rock condition. The insitu tests are

    • Shear test

    • Deformability test

    • Strength test

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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 strips.

  • Com

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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 mineral- walled f

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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 the boundar

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