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AAI Junior Executive (Engineering) — free MCQ practice

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AAI Junior Executive (Engineering) subjects

Thermodynamics (30)

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An engineer adds up the mechanical energies of every molecule in a gas. That total is the system's:Read the answer and worked solution →The imagined wall separating a system from its surroundings, across which heat and work pass, is the:Read the answer and worked solution →A kettle exchanges both heat and steam with the room. Such a system is described as:Read the answer and worked solution →Gas sealed inside rigid, thermally insulating walls exchanges nothing at all. Such a system is called isolated and:Read the answer and worked solution →

Worked practice questions

An engineer adds up the mechanical energies of every molecule in a gas. That total is the system's:

  1. Internal energy
  2. Interval energy
  3. Interior pressure
  4. Inertial energy
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Correct answer: A. Internal energy

1. Each molecule carries kinetic and potential energy of its own. 2. Summing them across the whole system gives one quantity. 3. That total is the internal energy. _Source: OpenStax University Physics Volume 2, Chapter 3, The First Law of Thermodynamics._

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The imagined wall separating a system from its surroundings, across which heat and work pass, is the:

  1. Bulkhead
  2. Boundary
  3. Barrier film
  4. Baseline
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Correct answer: B. Boundary

1. The system has to end somewhere for bookkeeping. 2. Energy exchanges are counted as they cross that line. 3. That line is the boundary. _Source: OpenStax University Physics Volume 2, Chapter 3, The First Law of Thermodynamics._

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A kettle exchanges both heat and steam with the room. Such a system is described as:

  1. Open system
  2. Closed system
  3. Isolated one
  4. Frozen one
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Correct answer: A. Open system

1. Energy crosses the boundary, and so does matter. 2. Only systems that exchange neither are isolated. 3. A system exchanging energy or matter is the open system. _Source: OpenStax University Physics Volume 2, Chapter 3, The First Law of Thermodynamics._

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