In column I some statements/phrases/terms are given and in column II are given some physical quantities. Match the entries of column I with the entries of column I with the entries of column II.
Column-I | Column-II |
(i) State variable | [A] Pressure |
(ii) Cannot be defined in non-equilibrium state | [B] internal energy |
(iii) Extensive state variable | [C] Temperature |
(iv) Intensive state variable | [D] Heat |
Text Solution
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Ans.
(i) [A], [B], [C]
(ii) [A], [B], [C], [D]
(iii) [B]
(iv) [A], [C]
Sol.
For A: heat is not s state variable as we cannot say that heat of a body is this much, heat is actually energy in transit. It is not used to characterize the state.
For B: In non-equilibrium state, we cannot assign any value to pressure, volume, temperature, internal energy etc. (i.e. state variables). But heat is the energy in transit which can be computed from the fact that how much energy is transferred, but from Q = ncdT. if temperature is not defined, then heat also cannot be defined.
For C: Extensive state variables indicate the size of the system
For D: Intensive state variables do not indicate the size of the system, like pressure and temperature.
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