4th Class Science Rocks and Soil / चट्टानें और मिट्टी Question Bank Rocks and Soil

  • question_answer

    Directions (Qs. 41 to 44): Look at the following table and answer the following: The Importance of Rocks and Minerals  
    Name Type of Rock Use
    Basalt Igneous Used in road building
    Calcite Mineral Used in cements and mortars.
    Granite Igneous Used for building, monuments, and tombstones.
    Marble Metamorphic Used In building, floors, tile in bathrooms.
    Obsidian Igneous Used in making arrowheads and knives
    Pumice Igneous Used in scouring, scrubbing, and polishing materials.
    Quartz Mineral Used in making glass, electrical components, and optical lenses.
    Sandstone Sedimentary Used in the building industry for house.
    Slate Metamorphic Used for roofs, chalkboards.
     

    An igneous rock used for making roads is_______.

    A) basalt              

    B) granite        

    C) marble                        

    D) pumice

    Correct Answer: A

    Solution :

    Basalt is used for making roads. For road building, the rock used should be rough. Rough rock provides more friction. On a smooth rock, automobiles can slip. Therefore, this purpose is adequately served by basalt.     


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