Moment of Inertia MCQs

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

36 Solved Questions • 27 Mins Practice • Updated for 2026 Competitive Exams
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2026 Solved Edition · Updated October 2026 · Verified Editorial Standards

Welcome to the verified preparation module for Moment of Inertia 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 Rotational Mechanics (Physics).

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

Direct Definition & Conceptual Scope

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Moment of Inertia 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.

36 MCQs Page 1

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Topic Notes: Moment of Inertia

Quick Revision 3 min read 16 key points
Section 1 of 5

1 1. Definition and Fundamental Concept

4 points
  • Definition
    Moment of Inertia (I): Represents the rotational analogue of mass, quantifying a body's resistance to angular acceleration about a specific axis of rotation.
  • Theory
    Mathematical Definition: For a point mass, I = mr², where 'm' is mass and 'r' is the perpendicular distance from the axis of rotation.
  • Theory
    Summation Form: For a system of discrete particles, I = Σ(m_i * r_i²). It is a scalar quantity, not a vector, despite its directional dependence.
  • Fact
    Axis Dependence: The moment of inertia is not an intrinsic property of an object; it changes depending on the location and orientation of the rotation axis.
Section 1 / 5
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1
The sensitivity of a moving coil galvanometer depends on
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2
188. Moment of inertia of a circular wire of mass M and radius R about its diameter is
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3
A fly-wheel rotating about a fixed axis has a kinetic energy of 380 Joule when its angular speed is 30 rad/s. The moment of inertia of the fly-wheel about the axis of rotation is
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4
The moment of inertia of a circular ring about an axis passing through its centre and normal to its plane is 200 gm·cm^2. Then its moment of inertia about a diameter is
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5
The moment of inertia of a uniform semi-circular wire of mass M and radius R about a line perpendicular to the plane of the wire and passing through the centre is
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6
The root mean square distance of 5 identical particles of masses, 1 g each, and distributed along OX is 6 cm (from O). The total moment of inertia about OY is
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7
Five masses each of 2 kg are placed on a horizontal circular disc, which can be rotated about a vertical axis passing through its centre and all the masses be equidistant from the axis and at a distance of 10 cm from it. The moment of inertia of the whole system (in g·cm^2) is (Assume disc is of negligible mass)
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8
Ratio of moment of inertia of two objects 'A' and 'B' is 2:3. Which one of the following is the ratio of torques of 'A' and 'B' respectively, if both are being rotated with constant angular acceleration?
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9
The moment of inertia depends upon
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10
The moment of inertia of a solid sphere about a diameter is 8000 gm·cm^2 (mass of sphere = 50 gm, radius = 20 cm). The moment of inertia about a tangent will be
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Pedagogical Syllabus Blueprint

Moment of Inertia 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 Moment of Inertia MCQs consistently constitute a decisive 10% to 25% weightage of the Rotational Mechanics 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 Moment of Inertia 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.