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Standard XII

Physics

1st Law of Thermodynamics

A system perf...

Question

A system perform work $△ W$ when an amount of heat $△ Q$ added to the system the corresponding change in the internal energy is $△ U$ . A unique function of the intial and final states (irrespective of the mode of change ) is

△ Q

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△ W

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△ U

and

△ Q

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△ U

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Solution

The correct option is C $△ U$
Change in internal energy $(Δ U)$ depends upon initial an find state of the function while $Δ Q$ and $Δ W$ are path depends also.

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Similar questions

Q. If

Q, U

and

W

denotes respectively the heat added. change in internal energy and work done in a closed cycle process, then:

amount of work done in changing the state of a system is -15j. if the change in the initial internal energy 60j of the system is +15j, thena) Q=30J, U=45Jb) Q=30J, U=75Jc) Q=0, U=75Jd) Q=0, U=45J

Q. Match the thermodynamic processes taking place in a system with the correct conditions.
In the table,

Δ Q

is the heat supplied,

Δ W

is the work done and

Δ U

is the change in internal energy of the system.

Process	Condition
(i) Adiabatic	(A) $Δ W = 0$
(ii) Isothermal	(B) $Δ Q = 0$
(iii) Isochoric	(C) $Δ U \neq 0$ , $Δ W \neq 0$ , $Δ Q \neq 0$
(iv) Isobaric	(D) $Δ U = 0$

if Q,E and W denote respectively the heat added, change in internal energy and the work done in a closed cycle process then :

a) Q = W= 0 b) E = 0 c) Q = 0 d) W = 0

Q. In changing the state of thermodynamics from A to B state, the heat required is

Q

and the work done by the system is

W

. The change in its internal energy is

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A system perform work △W when an amount of heat △Q added to the system the corresponding change in the internal energy is △U. A unique function of the intial and final states (irrespective of the mode of change ) is

The correct option is C △UChange in internal energy (ΔU) depends upon initial an find state of the function while ΔQ and ΔW are path depends also.

A system perform work $△ W$ when an amount of heat $△ Q$ added to the system the corresponding change in the internal energy is $△ U$ . A unique function of the intial and final states (irrespective of the mode of change ) is

The correct option is C $△ U$
Change in internal energy $(Δ U)$ depends upon initial an find state of the function while $Δ Q$ and $Δ W$ are path depends also.