279) The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is given by

280) The approximate value of the ratio between direct tensile strength and flexural strength is

281) Strength of concrete increases with

282) The relation between modulus of rupturefcr and characteristic strength of concrete fck is given by [where fcr and fck are in N/mm2']

283) The compressive strength of 100 mm cube as compared to 150 mm cube is always