In addition to the environment, rock strength depends on the following :
Statement (i) : Size of the rock specimen
Statement (ii) : Rate of loading
Statement (iii) : Cycle of loading
Statement (iv) : Loading condition.

Mechanical properties which are of interest in rock mechanics are: Strength, Deformability, Elasticity and ___________

Mechanical properties of a rock mass depends on the following factors
Statement (i) : The mechanical properties of individual elements constituting the system.
Statement (ii) : The sliding friction along the planes of weakness.
Statement (iii) : The configuration of the system with respect to direction of loading
Statement (iv) : The induced stress condition inside the mass.
Out of the above statements :

Statement (i) : Rocks fail by splitting, shear or combination of these
Statement (ii) : Failure of rock is either ductile or brittle and it depends upon the amount of temperature
Statement (iii) : Fracture of rock is either ductile or brittle and it depends upon the amount of confining pressure
Statement (iv) : Shear failure occurs in a rock if confining pressures are sufficiently high to prevent splitting.
Out of above statements. which choice is correct.

Rocks fail by