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Coarse threads bite into wood fibers, giving stronger holding power. Fine threads are better for metal. AO emphasizes real-world fastening logic.

Cross-braces prevent scaffolding from swaying or collapsing by stabilizing the frame. They are structural, not decorative or cost-related. AO often tests reinforcement and safety in construction assemblies.

Regular = 40 × 12 = 480.

Overtime = 8 × (12 × 1.5) = 8 × 18 = 144.

Total = 480 + 144 = 624. Correct = C. AR often tests pay and overtime problems.

Lock washers apply tension that resists loosening from vibration or movement. They don’t ease removal or serve decoration. AO problems test reasoning about reinforcement and fastening security.

A vernier caliper precisely measures inside, outside diameters, and depths. Tape measures (A) lack precision, handsaws (C) cut wood, pipe wrenches (D) grip round objects. SI questions emphasize correct tool identification for precision vs general use.