A refrigerator operates for a certain time, and the work done by the electrical energy during this time is W = 1000 J. What can be said about the heat delivered to the room containing the refrigerator?
Correct answer: C. The heat delivered to the room is greater than 1000 J
- A. The heat delivered to the room is less than 1000 J
- B. The heat delivered to the room is equal to 1000 J
- C. The heat delivered to the room is greater than 1000 J
- D. No heat is delivered to the room
Explanation
The refrigerator uses electrical energy for cooling, however, since it is not ideal, efficiency will not be 100% and will create waste energy in the form of heat sound etc, therefore, "heat delivered to the room will be greater than 1000 J".
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
The 1st law of thermodynamics is the generalization of the law of conservation of:
In isochoric process:
The thermodynamic process during which the pressure is kept constant is called
Which statement is incorrect?
In an adiabatic process -----------------.
An ideal reversible heat engine is 100 efficient only if: