CTET PAPER II 2019 · PYQ · Heat and Temperature · medium
Aman keeps a plastic bottle, a wooden spoon and a metallic spoon in a closed room overnight. The room temperature is 30 °C. In the morning he records the temperatures of the three objects as T1, T2 and T3. Which of the following most likely represents the relation between them?
A.T1 = T2 = T3✓ Correct
B.T3 > T2 > T1
C.T1 = T2 < T3
D.T1 > T2 > T3
Explanation
When objects are kept in a closed room overnight, they all attain thermal equilibrium with the surroundings. Regardless of the material (plastic, wood, or metal), after sufficient time all objects reach the same temperature as the room. Although metal feels colder to touch due to its higher thermal conductivity, the actual temperature of all three objects is equal to the room temperature of 30 °C. Hence T1 = T2 = T3.
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