All BEST Informative Concrete MCQ Practice Test Questions
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Civil Engineering MCQs
What is the strength of m30 concrete After 7 day as per IS 456?
ANSWER = 20 N/mm2
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The characteristic strength of concrete is defined as that compressive strength below which is NOT more than
ANSWER = [C] 5% of results fall
Generally, Concrete cube tests measure concrete’s
ANSWER = [A] Compressive strength
The modulus of rupture of concrete gives (GATE 1995)
ANSWER = [C] the tensile strength of the concrete under bending
The cylinder strength of the concrete is less than the cube strength because of
ANSWER = [C] the friction between the concrete specimens and the steel plate of the testing machine
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The cylinder strength of the concrete is less than the cube strength because of the friction between the concrete specimens and the steel plate of the testing machine
The flexural strength of M30 concrete as per IS 456 : 2000 is [GATE 2005 : 2 Marks]
ANSWER = [A] 3.83 MPa
The flexural strength of M30 concrete as per IS 456:2000 is 3.83 MPa
As per IS 456:2000, the flexural strength of concrete at 28 days of ageing is related to compressive strength by the equation:
ANSWER = [A] 0.7√fck
Characteristic Strength of Concrete (fck)
The compressive strength of concrete is given in terms of the characteristic compressive strength of 150 mm size cubes tested after 28 days
The characteristics strength is defined as the strength of concrete below which not more than 55 of the test results are expected to fall
Flexural Strength of Concrete
The theoretical maximum flexural tensile stress occurring in the extreme fibers of RC beam, which causes cracking is referred to as the modulus of rupture (fcr)
Clause 6.2.2 of IS 456 gives the modulus of rupture of flexural tensile strength as 0.7√fck
What is the value of flexural strength of M25 concrete? [ESE : 2005]
ANSWER = [B] 3.5 MPa
At what stress does the first flexural crack appear in RCC beams made of M25 grade concrete? [ESE : 2009]
ANSWER = [B] 3.5 MPa
The modulus of rupture of concrete in terms of its characteristic cube compressive strength (fck) in MPa according to IS 456: 2000 is [GATE QnA 2009 : 1 Mark]
ANSWER = [D] 0.7 √fck
As per IS 456, splitting tensile strength (fcr) of concrete may be estimated from compressive strength as
ANSWER = [B] fcr = 0.7√fck
