65) Guest′s theory of failure is applicable for following type of materials

66) Rankine′s theory of failure is applicable for following type of materials

67) If an unsupported uniform cross sectional elastic bar is subjected to a longitudinal impact from a rigid bob moving with velocity v, then a compressive wave of intensity sc is propagated through the bar as follows

68) Tensile strength of a mild steel specimen can be roughly predicted from following hardness test

69) Resilience of a material is important, when it is subjected to