ERB Professional Registration (UG) Thermodynamics — practice questions
22 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice ERB Professional Registration (UG) Thermodynamics in the app →An engineer adds up the mechanical energies of every molecule in a gas. That total is the system's:The imagined wall separating a system from its surroundings, across which heat and work pass, is the:A kettle exchanges both heat and steam with the room. Such a system is described as:Gas sealed inside rigid, thermally insulating walls exchanges nothing at all. Such a system is called isolatedA system takes in 400 J of heat and does 100 J of work. Its internal energy therefore changes by:That calculation follows one law relating heat, work and internal energy. It is the:That law is described, at bottom, as a statement of energy:One physicist summarised the same law humorously as: you cannot get more energy out of a system than you:A gas expands and pushes the piston outward. The work done by the gas is counted as:The piston is pushed back in and the gas is compressed. That same work is now counted as:On a pressure-volume graph, the work done by a slowly expanding gas is read off as the:Internal energy depends only on the current state, not on how the system got there. Quantities like this are cA system is taken round a cycle and returns to its starting state. The change in its internal energy over thatFor an ideal gas specifically, internal energy is fixed by one variable alone. That variable is the:A gas expands while its temperature is held constant throughout. That process is:In an ideal gas that process leaves internal energy unchanged, so all the heat supplied goes into:A gas is insulated so that no heat enters or leaves while its state changes. That process is:A gas expands while the pressure is held constant. That process is described as:The gas is then cooled in a rigid container so its volume cannot change. That process is:A system is taken through several steps and ends in exactly the state it began in. That sequence is a:Three different quasi-static routes connect the same two equilibrium states. Work generally differs between thA machinist calculates a temperature rise in a copper fitting and needs a property of copper. That property is