Entropy and Second Law Practice
10 problems · instant feedback · full explanations
Entropy of an isolated system never decreases. The second law doesn't forbid order — it says order must be paid for with greater disorder elsewhere.
Q1.
The second law of thermodynamics states:
Multiple choice · Easy
Q2.
When ice melts, the entropy of the water:
Multiple choice · Easy
Q3.
Why does a refrigerator need electrical power?
Multiple choice · Medium
Q4.
In a perfectly reversible process, the total entropy change is:
Multiple choice · Medium
Q5.
3000 J of heat flows into a reservoir at 300 K. What is its entropy change?
Numerical answer (J/K) · Medium
Q6.
Heat Q flows from Th to Tc (Th > Tc). What is the net entropy change?
Multiple choice · Hard
Q7.
The total entropy of the universe is increasing.
True / False · Easy
Q8.
The existence of complex life violates the second law of thermodynamics.
True / False · Medium
Q9.
2 kg of ice melts at 273 K absorbing 668,000 J. What is the entropy change of the ice? (J/K)
Numerical answer (J/K) · Hard
Q10.
A reversible engine absorbs 1000 J at 500 K and rejects heat at 300 K. How much heat is rejected? (J)
Numerical answer (J) · Hard