During uniaxial compressive testing of a rock specimen of diameter 54 mm and length 120 mm, the axial strain was found to be 6.5 × 10^-4 mm/mm. If the Poisson's ratio of the rock is 0.3, the volumetric strain of the rock specimen in mm/mm is

A. rock strength B. RQD C. ground water condition D. layers thickness

A. 5 - 10 KN B. 15 - 20 KN C. 50 - 60 KN D. 120 - 130 KN

A. point load test B. servocontrolled test C. displacement test D. post peak test

A. 1.25 B. 1.50 C. 2.25 D. 1.00