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Q: The minimum number of cores to be taken for core test, in connection with inspection and safety of concrete structures is:
  • A. 2
  • B. 4
  • C. 5
  • D. 3
Correct Answer: Option D - As per IS 456 : 2000 - Clause. 17.4 Core test– The points from which cores are to be taken and the number of cores required shall be at the discretion of the whole of concrete concerned in no case however shall fewer than three cores be tested. • Cores shall be prepared and tested as described in IS 516.
D. As per IS 456 : 2000 - Clause. 17.4 Core test– The points from which cores are to be taken and the number of cores required shall be at the discretion of the whole of concrete concerned in no case however shall fewer than three cores be tested. • Cores shall be prepared and tested as described in IS 516.

Explanations:

As per IS 456 : 2000 - Clause. 17.4 Core test– The points from which cores are to be taken and the number of cores required shall be at the discretion of the whole of concrete concerned in no case however shall fewer than three cores be tested. • Cores shall be prepared and tested as described in IS 516.