Physics - Heat & Thermo Question with Solution | TestHub
A sample A of liquid water and a sample B of ice of identical mass are kept in 2 nearby containers so that they can exchange heat with each other but are thermally insulated from the surroundings. The graphs in column-II show the sketch of temperature of samples versus time . Match with appropriate description in column-I.
Column I | Column II |
|---|---|
(A) Equilibrium temperature is above melting point of ice. | (P)
|
(B) At least some of water freezes. | (Q)
|
(C) The graph is impossible. | (R)
|
| (S)
|
Options:
Answer:
Solution:
Q: ice warms, melts at constant temperature, then warms as liquid. Final temperature exceeds the melting point.
P and R: water has a freezing plateau, so at least some water freezes. R ends below the melting point after freezing is complete.
S: after temperatures meet, they diverge without external heat exchange, which is impossible.
