Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
AP EAMCET202119 Aug 2021Morning ShiftPhysicsThermodynamicsActual

A system is taken from state - A to state - B along two different paths. The heat absorbed and work done by the system along these two paths are Q 1 , Q 2 and W 1 , W 2 respectively, then

Options

  1. AQ 1 = Q 2
  2. BW 1 = W 2
  3. CQ 1 − W 1 = Q 2 − W 2
  4. DQ 1 + W 1 = Q 2 + W 2

Correct answer

C. Q 1 − W 1 = Q 2 − W 2

Step-by-step solution

Internal energy for a thermodynamic process is a point function, it does not depend upon the path or process it only depends upon the initial and final state of the process. Therefore, if two different processes have the same initial and final state then the internal energy of system will be same for both processes. Using the first law of thermodynamics for a finite process. Q = W + ∆ U For path 1   the first law can be written as, Q 1 = W 1 + ∆ U               &#

Practice Thermodynamics on Quantrex Academy →

More from Thermodynamics

Following graph shows four different processes, adiabatic, isothermal, isobaric and isochoric for an ideal gas, from the same initial state. Study the graph carefully and state whi 2026Two vessels A and B contain same mass of Oxygen and Hydrogen respectively at the same temperature. The volume of B is twice that of A. The ratio of gas pressure in A to that in B i 20261 kg of water at 100^ C is converted to steam at the same temperature. Volume of 1 cc of water changes to 1671 10^3 cc on boiling. The change in internal energy of the system is (L 2026The efficiency of a Carnot's heat engine is 1 3 . If the temperature of the source is decreased by 50^ C and the temperature of the sink is increased by 25^ C , the efficiency of t 2025The change in internal energy of given mass of a gas, when its volume changes from V to 3 V at constant pressure P is ( - Ratio of the specific heat capacities of the gas) 2025A monatomic gas at a pressure of 100 kPa expands adiabatically such that its final volume becomes 8 times its initial volume. If the work done during the process is 180 J, then the 2025The ratio of the efficiencies of two Carnot engines A and B is 1.25 and the temperature difference between the source and the sink is same in both the engines. The ratio of the abs 2025The heat supplied to a gas at a constant pressure of 5 10^5 ~Pa is 1000 kJ. If the volume of gas changes from 1 ~m ^3 to 2.5 ~m ^3 , then the change in internal energy of the gas i 2025 Full Thermodynamics list All AP EAMCET PYQs