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Mechanical Reasoning Concepts Flashcards

7 cards from real GCAT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. A compound pulley system has 4 rope segments supporting a load. What is the ideal mechanical advantage?

    Answer: 4

    The mechanical advantage of a block-and-tackle equals the number of rope segments supporting the moving block.

  2. Which material property describes a material's ability to return to its original shape after a deforming force is removed?

    Answer: Elasticity

    Elasticity is the property by which a material recovers its original shape after deformation forces are removed.

  3. A flywheel stores kinetic energy in rotation. If its rotational speed doubles, its stored energy:

    Answer: Quadruples

    Rotational kinetic energy = ½Iω²; doubling ω increases energy by 2² = 4 times.

  4. In a belt-and-pulley system, a 10 cm driver pulley turns at 600 RPM driving a 30 cm driven pulley. What is the driven pulley's speed?

    Answer: 200 RPM

    Pulley speed ratio inversely follows diameter ratio: driven speed = 600 × (10/30) = 200 RPM.

  5. A metal beam fixed at one end (cantilever) deflects under a load at its free end. If the load is doubled, the deflection:

    Answer: Doubles

    Beam deflection is directly proportional to load for elastic deformation, so doubling the load doubles deflection.

  6. What does a manometer measure?

    Answer: Fluid pressure

    A manometer measures fluid (liquid or gas) pressure by the height difference of a fluid column.

  7. A piston in a cylinder compresses gas from 4 L to 1 L at constant temperature. If the initial pressure was 1 atm, what is the final pressure?

    Answer: 4 atm

    Boyle's Law: P₁V₁ = P₂V₂; P₂ = (1 atm × 4 L) / 1 L = 4 atm.