A thermally insulated rigid container contains an ideal gas. It is heated through a resistance coil of 100Ω by passing a current of 1 A for five minutes, then the change in internal energy of the gas is:
Correct answer: D. 30 kJ
- A. 0 kJ
- B. 10 kJ
- C. 20 kJ
- D. 30 kJ
Explanation
Heat energy supplied to the Ideal gas = I2RtHeat energy supplied to the Ideal gas = 12x100x5x60Heat energy supplied to the Ideal gas = 30,000JHeat energy supplied to the Ideal gas = 30 kJChange in Internal Energy = work done on the system + heat energy suppliedChange in Internal Energ = 0 + 30 kJChange in Internal Energ = 30 kJ
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
For an adiabatic process, the first law of thermodynamics can be written as:
The first law of thermodynamics is a special case of :
If one mole of an ideal gas is heated at constant pressure, then the first law of thermodynamics can be written as:
What will be the change in internal energy when work done by the system is 210 J and heat absorbed is 20 J?
What will be the change in internal energy when work done by the system is 50 kJ and heat absorbed is 140 kJ?
The first law of thermodynamics in terms of an adiabatic process is: