Question

45. Work done in compression is least when the process is 1) Adiabatic

2) Isothermal

3) Isochoric

4) Isobaric​

Answer 1

Answer:

it's (1)

Explanation:

Adiabatic process

Answer 2

Work done will be least in isochoric process.

Reasons:

• First of all , work done as per 1st Law of Thermodynamics is calculated as P∆V.

• Here P refers to external pressure and ∆V refers to change in volume.

• Now , an isochoric process is an thermodynamic process where the volume remains constant.

• Hence , value of ∆V becomes zero.

• So, net work done also becomes zero.

Trick for similar questions:

If the question asked to find the minimum work in between isothermal, isobaric and adiabatic process, then what to do ??

• Simply draw the P - V diagram for adiabatic, isothermal and isobaric process with same initial state functions.

• Now , the curve with maximum steepness, will have least area under the curve.

• That curve will have minimum work done.

$\star$ Hope It Helps.