Concepts of System and Surroundings — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Concepts of System and Surroundings.

Combined Boundary Properties and System Type

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NEET could present a scenario where a system has multiple boundary characteristics, requiring students to deduce the system type. For example, 'A reaction occurs in a rigid, impermeable, diathermic container.' Students would need to combine 'impermeable' (no matter exchange) and 'diathermic' (heat exchange) to correctly identify it as a closed system. This tests a deeper understanding of boundary definitions beyond just system types.

Application of First Law to System Types

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This is a classic and highly testable angle. Questions will provide a system type (e.g., 'an isolated system') and ask about the relationship between $Delta U$, $q$, and $w$. For instance, 'For an isolated system, which of the following is true?' with options like $Delta U=0$, $q=0$, $w=0$, or combinations. This directly links the system definition to a fundamental thermodynamic law, making it a crucial conceptual check for NEET aspirants.

Biological Systems as Open Systems

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While often focused on chemical reactions, NEET sometimes includes examples from biology to test fundamental principles. A question could describe a biological process (e.g., respiration, digestion) and ask to classify the living organism or a specific organ as an open system, emphasizing the continuous exchange of matter (nutrients, oxygen, waste) and energy (heat, chemical energy) with the environment. This tests the breadth of application of thermodynamic concepts.