NEET Physics Heat Engines MCQ Question
Consider a heat engine where mechanical work is done by rotating a set of small paddles to churn water. If the temperature of the water increases from T_A to T_B, which of the following best describes the internal energy change (∆U) of the system?
∆U = U_B - U_A, where U_B is greater than U_A
∆U = U_A - U_B, where U_A is greater than U_B
∆U is zero because internal energy does not change
∆U is negative because the work is done on the system
Correct Answer
Detailed Explanation
The internal energy change (∆U) is calculated as U_B - U_A, where U_B is greater because the temperature increases (T_B > T_A).
Found an issue with this question?
Related Questions
More from
Which of the following statements about enthalpy changes in thermodynamics is correct?
What is the enthalpy change associated with the atomization of dihydrogen (H2)?
For a strongly endothermic reaction, what is the expected value of the equilibrium constant K?