Q1: The characteristic strength of concrete is defined as that compressive strength below which not more than

ANS:B - 5% of results fall

Compressive Strength.

The compressive strength of concrete is given in terms of the characteristic compressive strength of 150 mm size cubes tested at 28 days (fck). The characteristic strength is defined as the strength of the concrete below which not more than 5% of the test results are expected to fall.