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Q: In the composition of good bricks, the total content of silt and clay, by weight, should not be less than–
  • A. 20%
  • B. 30%
  • C. 50%
  • D. 75%
Correct Answer: Option C - According to IS code 2117:1991 and clause no. 5.1.1 and 5.1.2, • The clay or mixture of clays selected should preferably confirm to the following mechanical composition. Clay – 20 to 30% by mass Silt – 20 to 35% by mass Sand – 35 to 50% by mass The total content of clay and silt may preferably be not less than 50% by mass.
C. According to IS code 2117:1991 and clause no. 5.1.1 and 5.1.2, • The clay or mixture of clays selected should preferably confirm to the following mechanical composition. Clay – 20 to 30% by mass Silt – 20 to 35% by mass Sand – 35 to 50% by mass The total content of clay and silt may preferably be not less than 50% by mass.

Explanations:

According to IS code 2117:1991 and clause no. 5.1.1 and 5.1.2, • The clay or mixture of clays selected should preferably confirm to the following mechanical composition. Clay – 20 to 30% by mass Silt – 20 to 35% by mass Sand – 35 to 50% by mass The total content of clay and silt may preferably be not less than 50% by mass.