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Q: Specific gravity for most of the building stones lies between
  • A. 2.0 to 2.5
  • B. 2.5–3.0
  • C. 3.0–3.5
  • D. 3.5–4.0
Correct Answer: Option B - A good stone should not be porous, rain water, enter the pores which is generally acidic, chemical composition of stone limestone and weak sandstone are relatively less durable than a good sand stone, granite or gneiss. • Specific gravity for most of the building stones lie between 2.5-3.0. • Crushing strength of good building stone should be more than 1000 Kg/cm² or 100 MPa.
B. A good stone should not be porous, rain water, enter the pores which is generally acidic, chemical composition of stone limestone and weak sandstone are relatively less durable than a good sand stone, granite or gneiss. • Specific gravity for most of the building stones lie between 2.5-3.0. • Crushing strength of good building stone should be more than 1000 Kg/cm² or 100 MPa.

Explanations:

A good stone should not be porous, rain water, enter the pores which is generally acidic, chemical composition of stone limestone and weak sandstone are relatively less durable than a good sand stone, granite or gneiss. • Specific gravity for most of the building stones lie between 2.5-3.0. • Crushing strength of good building stone should be more than 1000 Kg/cm² or 100 MPa.