Civil Engineering MCQJE Level Civil Engineering
In IS 456 Limit State Method, the characteristic compressive strength of concrete (fck) is defined as:
RCCRCCEASY
Choose the correct answer
A
Average cube strength at 7 days
B
The 5th percentile 28-day cube strength (5% of results may fall below it)
C
Minimum cylinder strength
D
Average cube strength at 28 days
Correct Answer
B. The 5th percentile 28-day cube strength (5% of results may fall below it)
Why is this the answer?
fck = compressive strength of 150 mm cubes at 28 days below which NOT MORE than 5% of test results are expected to fall. It is the 5th percentile strength. M20 means fck = 20 MPa. Design strength = fck/γm = fck/1.5 = 0.67fck.
Related RCC MCQs
More solved RCC questions for AE/JE Civil Engineering exams.
- The 'ductility' of RC structures is improved under earthquake loading by:
- For a circular RC water tank with rigid base, the hoop tension is maximum at:
- The 'end block' in a post-tensioned member is specially designed for:
- A 'shear wall' in a multi-storey RC building acts as:
- The 'minimum clear cover' for reinforcement in a RCC beam in severe exposure (IS 456) is:
- The 'torsion' in RC beams is resisted by:
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