Isothermal and adiabatic processes
- An ideal gas undergoes four different processes from the same initial state as shown in the figure below. Those processes are adiabatic, isothermal, isobaric and isochoric. The curve which represents the adiabatic process among 1, 2, 3 and 4 is : Answer: 3. 2 On a P-V diagram, all processes start from the same point. Curve 1 is vertical (constant volume, isochoric) and curve 4 is hori... 1
- Two cylinders A and B of equal capacity are connected to each other via a stop cock. A contains an ideal gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stop cock is suddenly opened.… Answer: 2. adiabatic The system is thermally insulated, so no heat enters or leaves: Q=0 . That makes the process adiabatic. (This is a free... 1
- In which of the following processes, heat is neither absorbed nor released by a system ? Answer: 2. adiabatic In an adiabatic process Δ Q=0 by definition: no heat enters or leaves the system. In isothermal, isobaric and isochoric... 1
- Thermodynamic processes are indicated in the following diagram.Match the following :Column-1: P. Process I; Q. Process II; R. Process III; S. Process IVColumn-2: a. Adiabatic; b. Isobaric; c. Isochoric; d. Isothermal Answer: 1. P → c, Q → a, R → d, S → b Key idea: identify each process from the P-V diagram. I: vertical line, volume constant, isochoric (c)... 1
- A gas is compressed isothermally to half its initial volume. The same gas is compressed separately through an adiabatic process until its volume is again reduced to half. Then : Answer: 2. Compressing the gas through adiabatic process will require more work to be done. Key idea: compare areas under the P-V curves. Fo... 1