Discussion
Which of the following is not a hazard of lead acid battery work?
Electrocution at twelve volts
Explosion of hydrogen gas
Acid burns
Burns from a shorted tool
Answer: B
Twelve volts cannot drive a dangerous current through skin, so electrocution is not among the hazards. Hydrogen, acid and short circuit heating are all real. High voltage traction systems are an entirely different matter. The shared behaviour explains why these belong together and the differences explain why both exist. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Naming what changes and what stays the same is the reliable route through questions of this shape.
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