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NEET UG PHYSICS MCQ: THERMODYNAMICS
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The internal energy of a system remains constant
when it undergoes
(A) a cycle process
(B) an isothermal process
(C) an adiabatic process
(D) any process in which the heat given out by the
system is equal to the work done on the system
Choose the correct statement
when it undergoes
(A) a cycle process
(B) an isothermal process
(C) an adiabatic process
(D) any process in which the heat given out by the
system is equal to the work done on the system
Choose the correct statement
View answer and explanation
Correct option: D
A, B, D
The correct answer is D (A, B, D) because internal energy remains constant in a cyclic process, an isothermal process, and any process where heat given out equals work done on the system.
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A Carnot engine has efficiency . Efficiency becomes when temperature of sink is decreased by 50 K (keeping source fixed). What is the original temperature of the sink? If sink and source temperature of a refrigerator are and respectively. Then efficiency of refrigerator is The unit of mechanical equivalent of heat is
