GATE 2025 Chemical Engineering, Q16 · Thermodynamics
The correct answer is A, Isolated.
Question
The boundary of a system does not allow exchange of either mass or energy (in the form of heat and/or work) with the surroundings. The system is termed
Official answer: Isolated
Why
GATE 2025 official key: (A). An isolated system exchanges neither mass nor energy with its surroundings, closed systems allow energy exchange, adiabatic systems allow work/mass but not heat, and open systems allow both.
Explanation cross-checked for consistency. Final answer matches the official IIT answer key.