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Practice questions · 310B A

Performs common occupational skills

2 questions from this exam area, each with the full explanation shown — not just the answer. Free, no account.

12% of the exam

1

I-CAR reported a rocker panel that exploded during a repair. What sequence error caused it?

  1. The weld-through primer was applied too thinly to the mating flanges, and the zinc burned off and ignited inside the rocker
  2. Corrosion protection was sprayed into the rocker before the welding was finished, and the propellant fumes ignitedAnswer
  3. The seam sealer was applied after refinishing instead of before, and its solvent vapours built up inside the rocker
  4. The battery was left connected

Why that is right

In the reported case corrosion protection was applied before welding was completed; the fumes from the propellant ignited inside the rocker and exploded. Cavity products go in only after all welding and heating are done.

Why the other options are wrong

  • A. A thin coat is the correct way to apply weld-through primer.
  • C. Some sealers are specified for use after refinishing; that causes no explosion.
  • D. That risks electronic damage, not ignition of fumes in a cavity.

2

A pail of wash-bay soap concentrate has a supplier label with the signal word Warning and a hazard statement, but no pictogram. What is the correct conclusion?

  1. The product is still hazardous; some hazard categories require no pictogram, so follow the label and the SDSAnswer
  2. The label is illegal; a supplier label without a pictogram is non-compliant, so the product must be returned to the supplier
  3. The product is not hazardous; without a pictogram the signal word is just general advice, so it needs no precautions
  4. The product is exempt from WHMIS and needs no SDS

Why that is right

Several hazard classes and categories, for example Category 2B eye irritants and Category 4 flammable liquids, have no pictogram. The label must still show the signal word and hazard statements, and the precautions apply in full.

Why the other options are wrong

  • B. A label without a pictogram can be fully compliant for these categories.
  • C. The signal word and hazard statement show that it is a hazardous product.
  • D. It is a hazardous product under WHMIS, so an SDS is required.

Exam-style practice written to the published Red Seal standard. These are not real exam questions — the official Red Seal sample questions are deliberately excluded from everything we publish.

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