SSC Geography Sample Paper NCERT Sample Paper-4

  • question_answer
    Which of the following statements are correct?
    1. Lignite and low grade bituminous coal were formed during the Quaternary period.
    2. Dolomite is used as refractory material and flux in iron and steel industry.
    3. Chotanagpur plateau is the most extensive, rich and diversified mineral belt.
    Select the correct answer using the codes given below

    A)  1, 2 and 3        

    B)  1 and 2

    C)  2 and 3

    D)  1 and 3

    Correct Answer: C

    Solution :

    [c] Most lignites are geologically young, generally having formed during the Mesozoic and Cenozoic eras (approximately 251 million years ago to the present). The Quaternary is the most recent geological period of time in Earth's history, spanning the last two million years and extending up to the present day. Lignite, generally yellow to dark brown or rarely black coal that formed from peat at shallow depths and temperatures lower than \[100{}^\circ \,C\,\,\left( 212{}^\circ \,F \right).\] It has been estimated that nearly half of the world's total proven coal reserves are made up of lignite and subbituminous coal, but lignite has not been exploited to any great extent, because it is inferior to higher rank coals (e.g., bituminous coal) in calorific value, ease of handling, and storage stability. In areas where other fuels are scarce, the production of brown coal far exceeds that of bituminous coal.

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