If s is the shear strength, c and Φ are shear strength parameters, and σ_{n} is the normal stress at failure, then Coulomb's equation for shear strength of the soil can be represented by

If all the dimensions of a prismatic bar of square cross-section suspended freely from the ceiling of a roof are doubled then the total elongation produced by its own weight will increase

Which of the following statements are true for the pile shown in the figure ? 1. Frictional resistance acts upwards through the length of the pile. 2. Negative skin friction acts over the length AB 3. Frictional resistance acts upwards over the length BC 4. There is point resistance at level C Select the correct answer using the codes given below :