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AAI Junior Executive (Engineering) Physics — practice questions

Explore 30 free Physics questions in AAI Junior Executive (Engineering) Thermodynamics. Open each question or exercise to read its content, reference answers and available explanation.

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Physics questions and exercises with answers

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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 →A system takes in 400 J of heat and does 100 J of work. Its internal energy therefore changes by:Read the answer and worked solution →That calculation follows one law relating heat, work and internal energy. It is the:Read the answer and worked solution →That law is described, at bottom, as a statement of energy:Read the answer and worked solution →One physicist summarised the same law humorously as: you cannot get more energy out of a system than you:Read the answer and worked solution →A gas expands and pushes the piston outward. The work done by the gas is counted as:Read the answer and worked solution →The piston is pushed back in and the gas is compressed. That same work is now counted as:Read the answer and worked solution →On a pressure-volume graph, the work done by a slowly expanding gas is read off as the:Read the answer and worked solution →Internal energy depends only on the current state, not on how the system got there. Quantities like this are called:Read the answer and worked solution →A system is taken round a cycle and returns to its starting state. The change in its internal energy over that loop is:Read the answer and worked solution →For an ideal gas specifically, internal energy is fixed by one variable alone. That variable is the:Read the answer and worked solution →A gas expands while its temperature is held constant throughout. That process is:Read the answer and worked solution →In an ideal gas that process leaves internal energy unchanged, so all the heat supplied goes into:Read the answer and worked solution →A gas is insulated so that no heat enters or leaves while its state changes. That process is:Read the answer and worked solution →A gas expands while the pressure is held constant. That process is described as:Read the answer and worked solution →The gas is then cooled in a rigid container so its volume cannot change. That process is:Read the answer and worked solution →A system is taken through several steps and ends in exactly the state it began in. That sequence is a:Read the answer and worked solution →Three different quasi-static routes connect the same two equilibrium states. Work generally differs between them because work depends on the:Read the answer and worked solution →A machinist calculates a temperature rise in a copper fitting and needs a property of copper. That property is its:Read the answer and worked solution →Catch the process namesRead the answer and worked solution →Pop the energy termsRead the answer and worked solution →Run the thermodynamics gatesRead the answer and worked solution →Slice the thermodynamics wordsRead the answer and worked solution →Fixed or freeRead the answer and worked solution →Sort the thermodynamics wordsRead the answer and worked solution →Type the numberRead the answer and worked solution →Thermodynamics bingoRead 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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More Thermodynamics topics

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