A 10 m thick coal block is excavated by a contractor at a cost of Rs. 40 per m³. The excavated area, measured in the mine plan, is found to be50 cm². If the mine plan has been drawn to a scale of 1:1000, the payment to be made to the contractor, in lakhs of Rs., is _____

Identify the correct statement. $NONEL$ is used for surface connection of the blast holes in order to

Identify the initiation sequence which is NOT possible for surface blasting.

A rockmass is subjected to hydrostatic pressure of 6 MPa. If each of the measured strains $\varepsilon_{xx} = \varepsilon_{yy} = \varepsilon_{zz}$, is 2.0 mm/m, then the bulk modulus, in GPa, is ______

Identify the uniaxial compressive loading condition from the following four Mohr circles.

Out of the given stress-strain curves, identify the rock type that is most prone to rock burst.

For the critical path network shown, the slack for the activity 'b', in months, is

The value of x in the simultaneous equations is ______

$3x + y + 2z = 3$

$2x - 3y - z = -3$

$x + 2y + z = 4$

Data pertaining to a surface bench blast is given below:

Burden = 3.0 m

Sub-grade drilling = 1.0 m

Spacing = 4.0 m

Collar stemming = 4.0 m

Bench height = 10.0 m

Air decking length = 1.0 m

Density of rock = 2000 kg/m³

Linear charge concentration = 10 kg/m

The powder factor of the blast, in kg/tonne, is _____

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