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Q: The minimum crushing strength of 'A' class brick should be ..............
  • A. 150 kg/cm²
  • B. 105 kg/cm²
  • C. 70 kg/cm²
  • D. 50 kg/cm²
Correct Answer: Option B - The crushing strength of the first classes brick should not be less than 10.5 N/mm² or 105 kg/cm². • The crushing strength of the second class brick should not be less than 7.0 N/mm² or 70 kg/cm². • The crushing strength of IIIrd class brick – 3.5 N/mm² or 35 kg/cm².
B. The crushing strength of the first classes brick should not be less than 10.5 N/mm² or 105 kg/cm². • The crushing strength of the second class brick should not be less than 7.0 N/mm² or 70 kg/cm². • The crushing strength of IIIrd class brick – 3.5 N/mm² or 35 kg/cm².

Explanations:

The crushing strength of the first classes brick should not be less than 10.5 N/mm² or 105 kg/cm². • The crushing strength of the second class brick should not be less than 7.0 N/mm² or 70 kg/cm². • The crushing strength of IIIrd class brick – 3.5 N/mm² or 35 kg/cm².