JEE PHYSICS MCQ: THERMODYNAMICS

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(A): Heat flows always from a hotter body to a colder body by itself.
(R): Without an external aid heat cannot flow from colder body to a hotter body.

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Correct option: B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

Option B is correct because heat naturally flows from a hotter to a colder body, and external assistance is required for the reverse process.

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The work done in which of the following process is zero? Water is used to cool the radiators of engines in cars because A gas expand

0.25\,\,{m^3}

at constant pressure

{10^3}N/{m^2},

the work done is A thermodynamic process in which temperature

T

of the system remains constant though other variable

P

and

V

may change, is called What is the slope for an isothermal process? For adiabatic processes

\left( {\gamma = \frac{{{C_p}}}{{{C_v}}}} \right)