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51.	According to IRC:15-2011, Minimum cement content for 4.5 N/mm^2 characteristic flexural strength for OPC shall _____________(a) Shall not be less than 360 kg/m^3(b) Shall not be less than 425 kg/m^3(c) Shall not be less than 340 kg/m^3(d) Shall not be less than 500 kg/m^3I had been asked this question in exam.My question is taken from Road Method of Mix Design topic in chapter Concrete Mix Design of Concrete Technology
Answer» The correct option is (a) Shall not be less than 360 KG/m^3 The best EXPLANATION: According to IRC:15-2011, Minimum cement content for 4.5 N/mm^2 characteristic flexural strength for OPC shall not be less than 360 kg/ m^3 and for PCC it shouldn’t be less than 425 kg/m^3.

52.	Depending on the economical availability and dimensions of the structure determine the _____________(a) Slump value(b) The maximum size of aggregate(c) The amount of mixing water(d) The minimum water-cement ratioI have been asked this question in quiz.My question comes from American Concrete Method of Mix Design in section Concrete Mix Design of Concrete Technology
Answer» Correct OPTION is (b) The maximum size of aggregate To explain I would say: The value for the maximum size of aggregate depends on the ECONOMICAL availability and DIMENSIONS of the STRUCTURE DETERMINE.

53.	__________ has designated the concrete mixes into a number of grades as M10, M15.(a) IS 456-2000(b) IS 456-2010(c) IS 513-1999(d) IS 465-2000I have been asked this question during an online interview.My doubt is from Concept of Concrete Mix Design in section Concrete Mix Design of Concrete Technology
Answer» Correct choice is (a) IS 456-2000 The best explanation: IS 456-2000 has designated the concrete mixes into a NUMBER of GRADES as M10, M15, M20, M25, M30, M35 and M40.

54.	What is the approx. mix proportion for M25?(a) 1:3:6(b) 1:2:4(c) 1:1.5:3(d) 1:1:2The question was posed to me during an interview.The doubt is from Concept of Concrete Mix Design topic in chapter Concrete Mix Design of Concrete Technology
Answer» Correct option is (d) 1:1:2 To explain I would say: According to IS 456-2000 CODE, the APPROXIMATE value of MIX proportion for grade M25 is 1:1:2.