Archimedes’ Principle and Buoyancy MCQs

Prepare for Archimedes’ Principle and Buoyancy MCQs with verified questions, past-paper solutions, and conceptual explanations for CSS, PMS, FPSC, PPSC, and NTS examinations.

20 Solved Questions • 15 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 Archimedes’ Principle and Buoyancy 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 Fluid Mechanics (Physics).

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

Direct Definition & Conceptual Scope

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Archimedes’ Principle and Buoyancy 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.

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Topic Notes: Archimedes’ Principle and Buoyancy

Quick Revision 3 min read 12 key points
Section 1 of 3

1 1. Fundamental Concepts of Buoyancy

4 points
  • Definition
    Buoyant Force: An upward force exerted by a fluid that opposes the weight of an immersed object, resulting from the pressure difference between the top and bottom surfaces of the object.
  • Theory
    Archimedes' Principle: States that any object, wholly or partially immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object.
  • Fact
    SI Unit of Buoyancy: Since buoyant force is a force, its SI unit is the Newton (N), consistent with all other forces in mechanics.
  • Theory
    Equilibrium Condition: An object floats in a fluid if the buoyant force acting on it is exactly equal to the weight of the object, resulting in a net force of zero.
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1
What is the buoyant force on a 2 cubic meter object submerged in water (density = 1000 kg/m^3) with g = 9.8 m/s^2?
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2
Archimedes' principle applies to which state of matter?
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3
If an object is neutrally buoyant in a fluid, what is its acceleration?
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4
What is the primary reason an object appears lighter when submerged in a liquid?
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5
An object weighs 10N in air and 7N when submerged in water. What is the buoyant force acting on it?
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6
Which of the following fluids would provide the greatest buoyant force for a fully submerged object of fixed volume?
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7
A block of wood floats in water with half of its volume submerged. What is the ratio of the density of wood to the density of water?
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8
What happens to the buoyant force on a submarine as it descends deeper into the ocean at a constant volume?
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9
The center of buoyancy is located at the center of gravity of which of the following?
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10
A ship made of steel floats on water because of which factor?
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Pedagogical Syllabus Blueprint

Archimedes’ Principle and Buoyancy 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 Archimedes’ Principle and Buoyancy MCQs consistently constitute a decisive 10% to 25% weightage of the Fluid 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 Archimedes’ Principle and Buoyancy 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.