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OAR Mechanical Reasoning Flashcards

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

Read the first 7 OAR Mechanical Reasoning flashcards as text

  1. A boat floats because the buoyant force equals its weight. If cargo is added until the boat sinks lower in the water, the buoyant force:

    Answer: Increases as more water is displaced

    Buoyant force equals the weight of displaced water, which increases as the boat sinks deeper.

  2. A screw with 20 threads per inch is turned 5 full rotations. How far does it advance into the material?

    Answer: 1/4 inch

    Each rotation advances the screw 1/20 inch; 5 rotations × (1/20 in) = 1/4 inch.

  3. A refrigerator removes heat from inside by using a refrigerant. The compressor's role in this cycle is to:

    Answer: Pressurize the refrigerant so it can release heat outside

    The compressor raises refrigerant pressure, causing it to condense and release absorbed heat at the condenser coils outside.

  4. A 60 kg person stands on a scale in an elevator accelerating upward at 2 m/s². What does the scale read? (g = 10 m/s²)

    Answer: 720 N

    Scale reads N = m(g + a) = 60 × (10 + 2) = 720 N.

  5. Three resistors of 6 Ω each are connected in parallel. What is the total resistance of the circuit?

    Answer: 2 Ω

    For N equal resistors in parallel: R_total = R/N = 6/3 = 2 Ω.

  6. A wheel and axle system has a wheel radius of 30 cm and an axle radius of 5 cm. What mechanical advantage does it provide?

    Answer: 6

    Mechanical advantage = wheel radius / axle radius = 30/5 = 6.

  7. When a gas in a sealed container is heated at constant volume, its pressure:

    Answer: Increases proportionally

    Gay-Lussac's Law: at constant volume, pressure is directly proportional to absolute temperature.