Second Law and Entropy MCQs

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

19 Solved Questions • 15 Mins Practice • Updated for 2026 Competitive Exams
MCQS
2026 Solved Edition · Updated October 2026 · Verified Editorial Standards

Welcome to the verified preparation module for Second Law and Entropy MCQs 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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Second Law and Entropy 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

Practice with answers, explanations, and exam-focused revision notes.

19 MCQs Page 1

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Topic Notes: Second Law and Entropy

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

1 1. Fundamental Concepts of Entropy

4 points
  • Definition
    Entropy: A thermodynamic state function that serves as a quantitative measure of the microscopic disorder or randomness within a system.
  • Definition
    Second Law of Thermodynamics: States that the total entropy of an isolated system can never decrease over time; it can only remain constant or increase.
  • Fact
    Entropy Change Formula: For a reversible process, the change in entropy (dS) is defined as the ratio of heat added (dQ) to the absolute temperature (T), or dS = dQ/T.
  • Fact
    Units of Entropy: Measured in Joules per Kelvin (J/K) in the SI system, representing the energy dispersal per unit of temperature.
Section 1 / 4
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1
Frequency of second pendulum is
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2
The frequency of an oscillating object is 0.2 Hz. Its time period will be
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3
The length of second's pendulum is approximately
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4
What is a second's pendulum ?
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6
A capacitor is charged from a 4 volt supply 50 times per second and discharged through a milliammeter 50 times per second by means of a vibrating switch. If the milliammeter reads 1 mA, the value of the capacitance is given by
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7
Which one of the following represents an ohm?
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8
15. A generator produces a voltage that is given by V = 240 sin 120t volt where t is in second. The frequency and r.m.s voltage are
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9
The change in entropy of the melting of 1 kg of ice at 0°C will be
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10
When all the systems taking part in a process are included, the entropy
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Pedagogical Syllabus Blueprint

Second Law and Entropy 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 Second Law and Entropy 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 Second Law and Entropy 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.