Consider the following statements : A critical activity in a CPM network has 1. The longest duration of all activities 2. zero total float 3. zero for float 4. The shortest duration of all activities which one of the statements given above are correct ?
A round steel bar of overall length 40 cm consists of two equal portions of 29 cm each having diameters of 10 cm and 8 cm respectively. If the rod is subjected to a tensile load of 10 tones, the elongation will be given by :(E = 2 x 106 kg/cm2)