The property that CANNOT be determined from uniaxial compressive strength test of a rock sample fitted with strain gauges is

Ward-Leonard system is provided in the winding system in order to restrict

The equipment NOT related to extraction of coal from longwall face operation is

The significance of ‘potentially explosive mixture’ in Coward flammability diagram is

The degree of the differential equation $\frac{d^2x}{dt^2} + 2x^3 = 0$ is ______.

The slope of the line connecting the points (20, 6) and (40, 8) is ______.

Two contours of RL 60 m and 70 m are separated by 34 m measured along dip of the seam. The dip of the seam in degree is ______.

Identify the pattern of surface blasting given in the figure. The values of delay time, in ms, are given against each blasthole.

A force $\vec{P} = 2\hat{i} - 5\hat{j} + 6\hat{k}$ acts on a particle. The particle is moved from point A to point B, where the position vectors of $\vec{A}$ and $\vec{B}$ are $6\hat{i} + \hat{j} - 3\hat{k}$ and $4\hat{i} - 3\hat{j} - 2\hat{k}$ respectively. The work done is ______

Out of the support categories given for an underground coal mine, identify the ‘active support’.