True or False: DC current tends to cause muscles to spasm or contract involuntarily upon contact.

• A. True
• B. False
• C. Only in high doses
• D. Only in low doses

Answer: (A)

The statement that DC current tends to cause muscles to spasm or contract involuntarily upon contact is true. This phenomenon occurs because direct current (DC) maintains a constant flow of electricity in one direction, which can affect the nervous system and muscle tissues. When there is contact with DC current, it can lead to sustained involuntary contractions, known as tetany, as the muscle fibers become activated repeatedly due to the ongoing electrical stimulation.

Unlike alternating current (AC), which can cause a different type of muscular response due to its changing direction, DC current's consistent flow means the body can have a more pronounced and persistent reaction. This is particularly important in safety protocols within mining and other industries, where awareness of electrical hazards is critical for protecting workers from electrical shocks and ensuring their overall safety.

The other choices introduced different conditions under which muscle contraction may occur, but they do not accurately describe the inherent nature of direct current's effect on muscle activity upon contact. Understanding this electrical behavior is crucial for anyone in the field, as it underscores the necessity for proper safety measures when working with or around electrical systems.