Surface Tension and Capillarity MCQs

Prepare for Surface Tension and Capillarity MCQs with verified questions, past-paper solutions, and conceptual explanations for CSS, PMS, FPSC, PPSC, and NTS examinations.

134 Solved Questions • 101 Mins Practice • Updated for 2026 Competitive Exams
MCQS
2026 Solved Edition · Updated October 2026 · Verified Editorial Standards

Welcome to the verified preparation module for Surface Tension and Capillarity 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 Properties of Matter (Physics).

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

Direct Definition & Conceptual Scope

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Surface Tension and Capillarity 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.

134 MCQs Page 1

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Topic Notes: Surface Tension and Capillarity

Quick Revision 3 min read 15 key points
Section 1 of 5

1 1. Fundamentals of Surface Tension

4 points
  • Definition
    Surface Tension: The property of a liquid surface that behaves like a stretched elastic membrane, caused by cohesive forces between molecules at the surface pulling them inward.
  • Fact
    Molecular Origin: Molecules in the bulk of a liquid experience equal forces in all directions, whereas surface molecules experience a net inward force, minimizing the surface area.
  • Fact
    Spherical Geometry: Liquids naturally form spherical droplets because a sphere has the minimum surface area for a given volume, representing the state of minimum potential energy.
  • Fact
    Floating Needle: A steel needle floats on water due to surface tension supporting its weight, provided the needle is placed gently so the surface film is not broken.
Section 1 / 5
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2
The following observations were taken for determining surface tension of water by capillary tube method: Diameter of capillary, D = 1.25 × 10⁻² m and rise of water in capillary, h = 1.45 × 10⁻² m. Taking g = 9.80 m s⁻² and using the relation T = (r g h / 2) × 10³ N m⁻¹, what is the possible error in surface tension T?
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3
It is desired to increase the frequency of a vibrating string from 50 hertz to 200 hertz. This can be done by increasing the tension of the string:
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4
On increasing the tension, frequency of vibration of a string:
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5
The SI unit of spring constant is identical with that of
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6
188. 64 small drops of mercury, each of radius r and charge q, coalesce to form a big drop of radius R. The ratio of the surface density of charge of each small drop with that of the big drop is:
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7
45 The capacity of a spherical conductor is numerically equal to its
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8
If the Earth's surface is treated as a conducting surface with some charge, what should be the charge per unit area so that a proton remains suspended in space near the Earth's surface? Take g = 10 m s^-2.
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9
152. In cosmic rays 0.15 proton/cm2·s are entering the earth's atmosphere. If the radius of the earth is 6400 km, the current received by the earth in the form of cosmic rays is nearly
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10
103. A point object is 24 cm above the surface of water. A fish inside water will observe the image to be at a distance
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Pedagogical Syllabus Blueprint

Surface Tension and Capillarity 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 Surface Tension and Capillarity MCQs consistently constitute a decisive 10% to 25% weightage of the Properties of Matter 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 Surface Tension and Capillarity 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.