Q.1 (vii) In a cyclic process, if Δ U = internal energy, W = work done, Q = Heat supplied then A. Δ U = Q B. Q = 0 C. W = 0 D. W = Q

Answer: D. W = Q Answer: (d) W = Q In a cyclic process the system returns to its initial state, so the change in internal energy (a state function) is zero: Δ U = 0 . By the first law Q = Δ U + W , hence Q = W : the net heat supplied equals the net work done by the system.

Chapter: Thermodynamics· Physics

In a cyclic process, if \(\Delta U\) = internal energy, W = work done, Q = Heat supplied then

Q.1 (vii) In a cyclic process, if \(\Delta U\) = internal energy, W = work done, Q = Heat supplied then

A. \(\Delta U = Q\)

B. \(Q = 0\)

C. \(W = 0\)

D. \(W = Q\)

Doubtly Asked 29 Oct 2026 Board exam · March 2024 hsc 12th Save WhatsApp Report

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Answer: D. \(W = Q\)

Answer: (d) \(W = Q\)

In a cyclic process the system returns to its initial state, so the change in internal energy (a state function) is zero: \(\Delta U = 0\). By the first law \(Q = \Delta U + W\), hence \(Q = W\): the net heat supplied equals the net work done by the system.

Doubtly AI · 29 Oct 2026 AI-generated · not yet verified Report

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In a cyclic process, if \(\Delta U\) = internal energy, W = work done, Q = Heat supplied then

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