Question
Physics Question on Laws of thermodynamics
For a system undergoing isothermal process, heat energy is supplied to the system. Choose the option showing correct statements
(a) Internal energy will increase
(b) Internal energy will decrease
(c) Work done by system is positive
(d) Work done by system is negative
(e) Internal energy remains constant
A
(a), (c), (e)
B
(b), (d)
C
(c), (e)
D
(a), (d), (e)
Answer
(c), (e)
Explanation
Solution
For isothermal process,
dT = 0
so, dU = 0 ⇒ Internal energy remains same
dQ = dW
as dQ is positive,
so, dW is positive.
Hence, the correct answer is (C) : (c), (e)