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Q: Into how many types are hollow concrete bricks classified?
  • A. Two
  • B. Five
  • C. Three
  • D. Four
Correct Answer: Option C - Hollow concrete blocks (Open and closed cavity types)– These blocks are classified by I.S. into the following three grades– (i) Grade A– These blocks are used for load bearing walls. They should have a minimum density of 1500 kg/m³. (ii) Grade B– These are also used for load baring walls and its density below 1500 kg/m³ but not less than 1000 kg/m³. (iii) Grade C– These are used for non-load bearing walls and its density is not less than 1000 kg/m³.
C. Hollow concrete blocks (Open and closed cavity types)– These blocks are classified by I.S. into the following three grades– (i) Grade A– These blocks are used for load bearing walls. They should have a minimum density of 1500 kg/m³. (ii) Grade B– These are also used for load baring walls and its density below 1500 kg/m³ but not less than 1000 kg/m³. (iii) Grade C– These are used for non-load bearing walls and its density is not less than 1000 kg/m³.

Explanations:

Hollow concrete blocks (Open and closed cavity types)– These blocks are classified by I.S. into the following three grades– (i) Grade A– These blocks are used for load bearing walls. They should have a minimum density of 1500 kg/m³. (ii) Grade B– These are also used for load baring walls and its density below 1500 kg/m³ but not less than 1000 kg/m³. (iii) Grade C– These are used for non-load bearing walls and its density is not less than 1000 kg/m³.