What is the function of roof bolts and other roof support systems?

• A. To monitor gas levels
• B. To stabilize the roof and prevent collapses by tying the rock mass together
• C. To collect dust
• D. To improve ventilation

Answer: (B)

The main concept being tested is that roof bolts and similar roof support systems are there to stabilize the overhead rock by tying the rock mass together so it behaves as a stronger, unified unit and resists movement that could lead to a collapse. In underground settings the roof is often fractured and under stress from the weight of rock above and mining activities. Roof bolts are driven into the rock and anchored, sometimes with resin or mechanical fittings, to hold blocks of rock in place and transfer load from the roof into more stable sections of rock. When used with other supports like rock bolts in patterns, mesh, and timber or steel sets, they create a continuous, reinforced roof that reduces spreading, chunking, and sudden falls. This stabilization is what protects workers as headings advance and supports are installed, making it the primary function of roof bolts.

Other choices describe different safety tasks not related to the structural purpose of roof support. Monitoring gas levels, collecting dust, and improving ventilation all address air quality and environmental safety rather than physically stabilizing the roof.