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6. Fuel, oxygen and an ignition source must be present to start a fire.

7. Flash arrester

8. The location where a drill bit enters a workpiece.

9. Paper, oxygen and an ignition source.

10. Boom supported aerial lifts.

Explanation:

6. Fuel, air and an ignition source are included in “Fire Triangle”. These three conditions represent an essential prerequisite for starting a fire.

7. Flash arrester is a safety device used in welding torches to stop the reverse flow of the flame thereby protecting the user from any further damage.

8. Point of Operation refers to the place at which work is being performed. In the case of drill bit working, the workplace is the point where the drill bit enters the workpiece.

9. Class A fires are fire coming of from common materials such as paper, plastic, trash etc.  

10. Fall protection refers to the safety net for the workers working at height. In the case of Boom supported aerial lifts, workers work at certain heights. Hence, they are equipped with fall protection gears.

answer:

(b)

explanation: