First Law of Thermodynamics MCQs

Prepare for First Law of Thermodynamics MCQs with verified questions, past-paper solutions, and conceptual explanations for CSS, PMS, FPSC, PPSC, and NTS examinations.

22 Solved Questions • 17 Mins Practice • Updated for 2026 Competitive Exams
MCQS
2026 Solved Edition · Updated October 2026 · Verified Editorial Standards

Welcome to the verified preparation module for Heat & Thermodynamics on McqsMind. This comprehensive set offers solved multiple-choice questions with answers, detailed explanations, and authentic past-paper style questions aligned with the latest syllabus of Heat & Thermodynamics (Physics).

100% Verified Answer Keys CSS, PMS, FPSC, PPSC, NTS Ready 2026/2027 Syllabus Guidelines

Direct Definition & Conceptual Scope

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First Law of Thermodynamics constitutes an essential examination topic within Physics, evaluating theoretical principles, historical context, and practical problem-solving applications. On MCQsMind, candidates practice verified past-paper solutions, conceptual breakdowns, and syllabus-aligned questions tailored for CSS, PMS, and competitive screening examinations.

Solved Questions

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Topic Notes: First Law of Thermodynamics

Quick Revision 3 min read 15 key points
Section 1 of 4

1 1. Fundamental Concept

4 points
  • Definition
    First Law of Thermodynamics: A statement of the Law of Conservation of Energy applied to thermodynamic systems, asserting that energy cannot be created or destroyed, only transferred or converted.
  • Theory
    Energy Balance: The total energy of an isolated system remains constant; the change in internal energy (ΔU) equals the net heat added to the system (Q) minus the work done by the system (W).
  • Definition
    Internal Energy (U): The sum of the kinetic and potential energies of the molecules within a system, which serves as a state function dependent only on the system's current state.
  • Fact
    State Function: Internal energy is a state function, meaning the change in internal energy between two states is independent of the path taken to reach the final state.
Section 1 / 4
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1
According to Kirchhoff's 1st rule
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2
In the periodic table, semi-conductors belong to:
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3
According to first law of thermodynamics which of the following is true
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4
Which equation describes the first law of thermodynamics?
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5
First law of thermodynamics when applied to an adiabatic process becomes:
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6
First law of thermodynamics is merely a statement of law of conservation of:
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7
The first law of thermodynamics is stated as ΔE = ΔQ + ΔW. Which of the quantities ΔU, ΔQ and ΔW are zero when the system is an ideal gas that undergoes a change at constant temperature?
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8
First law of thermodynamics is a special case of
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9
First law of thermodynamics corresponds to
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10
For the isothermal process shown, what is the mathematical form of the first law of thermodynamics for the system?
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Pedagogical Syllabus Blueprint

First Law of Thermodynamics MCQs: Preparation Strategy & Exam Blueprint

Examination Weightage & Commission Distribution

In Pakistan's premier competitive examinations—including the Federal Public Service Commission (FPSC General Recruitment & CSS MPT), Punjab Public Service Commission (PPSC Lecturer, Tehsildar & PMS Screening), KPPSC, SPSC, and BPSC—questions derived from First Law of Thermodynamics MCQs consistently constitute a decisive 10% to 25% weightage of the Heat & Thermodynamics paper. Testing agencies frequently evaluate both foundational factual recall and deeper analytical comprehension, requiring aspirants to master key dates, statutory articles, constitutional clauses, and thematic definitions.

High-Yield Conceptual Pillars & Distractor Analysis

Historical trend analysis across past five-year examination cycles demonstrates that examiner traps frequently involve closely matched numerical alternatives, chronologically contiguous treaties, and semantic subtleties in statutory phraseology. When preparing First Law of Thermodynamics MCQs, candidates must deliberately review the underlying rationale provided for every question rather than merely memorizing raw answer options. Understanding why incorrect distractors fail is the most reliable predictor of achieving top percentiles in computerized and optical mark recognition (OMR) screening tests.

Negative Marking Mitigation & Time Management Protocol

For examinations enforcing negative marking penalties (such as PPSC's 0.25-mark deduction per erroneous response or NTS gatekeeper quotas), an aggressive elimination technique must be deployed. Candidates should systematically rule out improbable options first to elevate probability thresholds from 25% to 50% or 100%. Allocating an average of 45 to 60 seconds per item during mock trials builds the psychological stamina and cognitive precision required to complete 100-question papers within official 90-minute time limits.

Recommended Reference Sources & Statutory Reading

To achieve definitive conceptual mastery in Physics, candidates are advised to cross-reference our solved explanations with primary gazettes, statutory texts, and canonical academic textbooks. Verifying controversial questions against authentic official repositories guarantees that prospective civil servants and professional candidates present incontestable answers during both optical paper evaluations and viva voce departmental interviews.