CMSP Fundamental Knowledge of Science 3

Question 1

In the context of mine explosions, what is the Lower Explosive Limit (LEL) of methane in air?

Accepted Answer

5%

Answer

Methane's LEL is 5% by volume in air; below this concentration the mixture is too lean to ignite.

Question 2

Which type of radiation can be stopped by a sheet of paper and poses the least penetrating hazard in mining?

Accepted Answer

Alpha radiation

Answer

Alpha particles have very low penetrating power and are stopped by a sheet of paper or a few centimeters of air, though they are hazardous if inhaled.

Question 3

What chemical property makes hydrogen sulfide (H₂S) particularly insidious as a mine hazard?

Accepted Answer

High concentrations paralyze the olfactory nerve, removing the warning smell

Answer

At high concentrations H₂S rapidly paralyzes the olfactory nerve so workers can no longer smell it, eliminating the natural warning of its rotten-egg odor.

Question 4

Which Newton's law is most directly applied when calculating the force required to move a loaded mine cart?

Accepted Answer

Newton's Second Law (F = ma)

Answer

Newton's Second Law (F = ma) directly relates the net force needed to accelerate a mass, making it the basis for calculating haulage forces.

Question 5

When coal dust is suspended in mine air, it becomes explosive primarily because:

Accepted Answer

Suspended particles dramatically increase the surface area available for rapid oxidation

Answer

Suspending dust creates an enormous surface area-to-mass ratio, allowing very rapid oxidation (combustion) when an ignition source is present.

(CMSP) Certified Mine Safety Professional Practice Test

(CMSP) Certified Mine Safety Professional Practice Test

CMSP Fundamental Knowledge of Science 3