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Q: Which of the following methods of quarrying is suitable for costly, soft and stratified rocks such as sandstone, limestone, laterite, marble and slate?
  • A. Blasting
  • B. Wedging
  • C. Excavating
  • D. Heating
Correct Answer: Option B - Quarrying of stones–Process of raking out stones from natural rock beds is known as the quarrying. Method of quarrying– (i) Excavating or digging–Stone buried in earth or under loose overburden are excavated with pick axes, crow bars, chisels, hammers etc. (ii) Wedging–It is mainly used for the rock of sedimentary type which are comparatively soft. Ex–Sand stone, limestone, marble, slate, laterite. (iii) Heating–It is most suitable for quarrying small, thin and regular blocks of stones from rocks. Ex–Granite, Gneiss. (iv) Channeling machine–It is possible to separate very large blocks of stones from the rocks by the application of this method. Ex–Limestone, marble other soft sand stone. (v) Blasting–In this method explosives are used to convert rocks into small pieces.
B. Quarrying of stones–Process of raking out stones from natural rock beds is known as the quarrying. Method of quarrying– (i) Excavating or digging–Stone buried in earth or under loose overburden are excavated with pick axes, crow bars, chisels, hammers etc. (ii) Wedging–It is mainly used for the rock of sedimentary type which are comparatively soft. Ex–Sand stone, limestone, marble, slate, laterite. (iii) Heating–It is most suitable for quarrying small, thin and regular blocks of stones from rocks. Ex–Granite, Gneiss. (iv) Channeling machine–It is possible to separate very large blocks of stones from the rocks by the application of this method. Ex–Limestone, marble other soft sand stone. (v) Blasting–In this method explosives are used to convert rocks into small pieces.

Explanations:

Quarrying of stones–Process of raking out stones from natural rock beds is known as the quarrying. Method of quarrying– (i) Excavating or digging–Stone buried in earth or under loose overburden are excavated with pick axes, crow bars, chisels, hammers etc. (ii) Wedging–It is mainly used for the rock of sedimentary type which are comparatively soft. Ex–Sand stone, limestone, marble, slate, laterite. (iii) Heating–It is most suitable for quarrying small, thin and regular blocks of stones from rocks. Ex–Granite, Gneiss. (iv) Channeling machine–It is possible to separate very large blocks of stones from the rocks by the application of this method. Ex–Limestone, marble other soft sand stone. (v) Blasting–In this method explosives are used to convert rocks into small pieces.