The components of state of stress at a point in x - y plane are given as σ_xx = 5 MPa, σ_yy = 10MPA and $${\tau _{xy}}$$ = 2MPa. The sum of the principal stresses acting on the x - y plane in MPa 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