When the heat is given to a gas in an Isothermal process, then there will be

Step-by-step solution

In an isothermal process, temperature remains constant ( T = 0 ). For an ideal gas, internal energy depends solely on temperature, so U = 0 . The First Law of Thermodynamics gives Q = U + W . Substituting U = 0 yields Q = W . Since heat is supplied ( Q > 0 ), the gas does positive work on its surroundings ( W > 0 ). Option analysis: A) External work done: consistent with derivation B) Rise in temperature: contradicts isothermal condition C) Increase in internal energy: contradicts U = 0 D) External work and tempera