The equation ΔU = ΔQ refers to:
Correct answer: C. Isochoric process
- A. Isothermal process
- B. Adiabatic process
- C. Isochoric process
- D. Isobaric process
- E. Carnot cycle
Explanation
For equation ΔU = ΔQ + W to be ΔU = ΔQ, the work done should be equal to 0. Work done is equal to P*ΔV, so for work done to be zero, change in volume should be zero (there should be constant volume). Processes with constant volume are called isochoric processes.
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
A system absorbs 1000 Joules of heat and delivers 600 Joules of work, while losing 100 Joules of heat by conduction to the atmosphere, the change in the internal energy of the system will be:
The efficiency of the Carnot's Engine working between 150°C and 50°C is:
According to the first law of thermodynamics, ΔU = Q + W, where ΔU Is the increase in internal energy of the system, Q is the heat transferred to the system and W is the external work done by the system.Which of the following is NOT a correct expression?
The amount of heat at constant volume is called as:
A gas is enclosed in a container fitted with a piston of cross-sectional area of 0.10 m2. The pressure of the gas is maintained at 8000 N/m2. When heat is slowly transferred, the piston is pushed up through a distance of 4.0 cm. If 42 J heat is transferred to the system during the expansion, what is the change in the internal energy of the system?
A fixed mass of gas in a thermally insulated container is compressed. After compression, the temperature of the gas will have: