The first law of thermodynamics can be stated as?
Correct answer: A. Q = ΔU + W
- A. Q = ΔU + W
- B. Q + ΔU = W
- C. Q = ΔU x W
- D. None of these
Explanation
The first law of thermodynamics states that the change in internal energy of a system equals the net heat transfer into the system minus the net work done by the system. In equation form, the first law of thermodynamics is ΔU = Q − W.Rearranging this gives: Q = ΔU + W
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About First Law of Thermodynamics
The first law relates heat supplied, work done and the change in internal energy through energy conservation. Problems use sign conventions and apply the law to isothermal, adiabatic, isobaric and isochoric processes. Internal energy is a state function, while heat and work depend on the path followed.
Practise Thermodynamics
714 free Thermodynamics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More First Law of Thermodynamics questions
Heat exchange between the system and surroundings at constant volume is shown by the relation:
When an ideal gas (γ=5/3) is heated under constant pressure, what percentage of given heat energy will be utilized in doing external work?
The internal energy of the system decreases in an adiabatic process. Which of the following must be true regarding this process?
If one mole of an ideal gas is heated at constant pressure, then the first law of thermodynamics can be written as:
The first law of thermodynamics is a special case of :
For an adiabatic process, the first law of thermodynamics can be written as: