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Thermodynamics and Heat Transfer Flashcards

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

Read the first 6 Thermodynamics and Heat Transfer flashcards as text

  1. What is the formula to convert a temperature from Celsius to Fahrenheit?

    Answer: °F = (°C × 9/5) + 32

    The standard conversion is °F = (°C × 9/5) + 32. For example, 100°C = (100 × 1.8) + 32 = 212°F (boiling point of water).

  2. What is absolute zero in Celsius?

    Answer: −273°C

    Absolute zero (0 K) is −273.15°C, commonly rounded to −273°C. At this temperature, all molecular motion theoretically stops.

  3. Which method of heat transfer requires no medium and can travel through a vacuum?

    Answer: Radiation

    Radiation transfers heat via electromagnetic waves (infrared) and requires no medium. This is how the Sun's heat reaches Earth through the vacuum of space.

  4. When a substance changes from liquid to gas, what happens to the temperature during the phase change (at constant pressure)?

    Answer: It remains constant

    During a phase change, energy input goes into breaking intermolecular bonds rather than raising temperature. Temperature stays constant until the phase change is complete.

  5. A metal rod expands when heated. This is an example of:

    Answer: Thermal expansion

    Thermal expansion is the tendency of matter to increase in volume when heated. Most solids, liquids, and gases expand as temperature rises due to increased molecular motion.

  6. If 500 J of heat is added to 1 kg of water (specific heat = 4,200 J/kg·°C), by approximately how much does the temperature rise?

    Answer: 0.12°C

    ΔT = Q / (m × c) = 500 / (1 × 4200) ≈ 0.119°C ≈ 0.12°C. Water has a high specific heat, meaning it requires a lot of energy to change temperature.