The following steps are necessary to obtain sufficient accuracy with the tape : 1. Keeping uniform tension on tape for each measurement: 2. "Breaking" tape on slopes are necessary to keep the tape level. 3. Keeping accurate count of the stations. 4. Keeping the tape on the line being measured. The correct sequence of these steps is

A bar of length l is uniformly tapering from a diameter d_{1} at one and to a diameter d_{2} at the other end. The bar is subjected to an axial tensile loads. What is the total elongation (where E = Young's modulus of elasticity. )

ABCD is a beam of length 5l which is supported at B and C (having supported length BC = 'l') and having two equal overhangs AB and CD of length 2l each. It carries a u.d.l. of intensity p per unit length throughout the beam as shown in the given figure. The points of contraflexure will occur