A hot work permit is necessary for which of the following activities?

A hot work permit is required for welding, brazing, cutting, and any use of flammable gas because these activities involve the potential ignition of combustible materials. The rationale behind this requirement is to ensure that all safety precautions are taken to prevent fires and explosions that can arise from sparks, heat, or open flames produced during these processes.

By requiring a hot work permit, the responsible parties can ensure that proper procedures are followed, such as assessing the work area for flammable or explosive materials, implementing safety measures, and preparing for emergency response if needed. This comprehensive approach underscores the importance of safety in environments where materials capable of burning are present.

Other activities, such as just welding or just cutting, do not encompass the full range of risks involved. Similarly, focusing only on flammable gas fails to account for the hazards associated with welding and cutting operations. Therefore, the correct answer highlights the full scope of activities that necessitate a hot work permit for effective safety management.