IAS Mains Geology Papers 1994

IAS Mains Geology 1994

Paper I

Section A

  1. Explain any three of the following in about 200 words each:

    1. Superimposed drainage

    2. Oceanic trenches

    3. Tectonic divisions of India

    4. Radioactivity and its applications to geological problems

  2. Describe the various types of mountains and emphasise the origin of fold mountains. Give example.

  3. Describe the following landforms:

    1. Sand bars

    2. Incised meanders

    3. Barrier reaf

    4. River terraces

    5. Crag and tail structure

  4. Describe the geometric features of folds caused by different mechanisms.

Section B

  1. Answer any three of the following in about 200 words each:

    1. Older Metamorphic Group of Bihar

    2. Structure of Gondwana basins and its bearing on sedimentation

    3. Utility of fossils

    4. Extinction of Dinosaurs

  2. Describe the stratigraphy and sedimentation characters of the Vindhyan Super Group of rocks. Briefly state its economic importancce.

  3. Draw a large labelled diagram of a Brachiopod shell and describe the important morphological characters.

  4. Discuss the following briefly:

    1. Stromatolites and their importance in Precambrian stratigraphy

    2. Role of microfossils in oil exploration

    3. Divisions of stratigraphy and their significance

Paper II

Section A

  1. Write notes on any three of the following in about 200 words each:

    1. Crystal irregularities

    2. Pleochroism

    3. Isomorphism

    4. Sphericity and Roundness in sediments

  2. Explain the use of X-ray studies in crystallographic investigations.

  3. Describe pyroxene group of minerals and their alteration products.

  4. Give a petrological account of Deccan Basalts and add a note on their origin.

Section B

  1. Write notes on any three of the following in about 200 words each:

    1. Ore and gangue

    2. Stability of hill side

    3. Sampling

    4. Lignite deposits

  2. Critically review the usefulness of aerial photographs in geological studies.

  3. Describe the classification of ore deposits.

  4. Explain the term exploration. Describe various methods and stages of mineral exploration.