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NEET-UG and JEE Main Physics · Class 12

Surface tension by capillary rise — NEET & JEE Questions

Surface tension by capillary rise is a topic in Experimental Skills, a Class 12 Physics chapter of the NEET-UG and JEE Main syllabus. TestBudy holds 14 published NEET-UG and JEE Main questions on Surface tension by capillary rise, each with the marking scheme of the real paper.

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Surface tension by capillary rise MCQs with solutions

10 of the 14 published questions on this topic, exactly as they appear in a test. Answers and worked solutions come with your result rather than on this page.

  1. Question 1 · difficulty L1 · recall

    Capillary rise in a narrow tube is caused by

    • A. surface tension together with wetting forces and pressure difference
    • B. gravity alone pulling liquid upward
    • C. magnetic attraction only
    • D. radioactive forces

  2. Question 2 · difficulty L1 · understanding

    For a liquid that wets the capillary with contact angle θ, the rise h is approximately

    • A. h=Tρgr
    • B. h=2T cosθ/(ρgr)
    • C. h=ρgr/(2T)
    • D. h=2Tr/(ρg)

  3. Question 3 · difficulty L2 · understanding

    Capillary rise is larger in a tube with

    • A. larger radius
    • B. the same radius but no surface tension
    • C. smaller radius
    • D. zero contact with liquid

  4. Question 4 · difficulty L2 · application

    For a wetting liquid with θ≈0, cosθ is approximately

    • A. 0
    • B. -1
    • C. 1/2 necessarily
    • D. 1

  5. Question 5 · difficulty L2 · understanding

    Capillary rise in a narrow tube is explained mainly by

    • A. surface tension together with wetting at the liquid-solid interface
    • B. viscosity alone
    • C. gravity alone pulling the liquid upward
    • D. zero atmospheric pressure

  6. Question 6 · difficulty L3 · application

    If capillary radius is doubled while other quantities stay fixed, rise becomes

    • A. one-half
    • B. twice
    • C. four times
    • D. unchanged

  7. Question 7 · difficulty L3 · application

    If liquid density increases at fixed T, r and θ, capillary rise

    • A. increases
    • B. decreases
    • C. stays fixed
    • D. changes sign automatically

  8. Question 8 · difficulty L3 · application

    For a wetting liquid, h=2Tcos⁡θ/(ρgr)h=2T\cos\theta/(\rho gr). If the capillary radius is halved while all other quantities remain unchanged, h becomes

    • A. twice as large
    • B. half as large
    • C. four times as large
    • D. unchanged

  9. Question 9 · difficulty L3 · application

    Water rises 3.0 cm in a capillary of radius 0.50 mm. Under the same conditions, what rise is expected in a tube of radius 1.0 mm?

    • A. 1.5 cm
    • B. 3.0 cm
    • C. 6.0 cm
    • D. 0.75 cm

  10. Question 10 · difficulty L4 · analysis

    A liquid depresses rather than rises in a capillary when

    • A. cosθ is positive
    • B. surface tension is zero only
    • C. cosθ is negative
    • D. density is zero

Common mistakes in Surface tension by capillary rise

Recorded against questions in this topic that are not shown above, so none of these points at an answer you can see on this page.

  • Forgets that $\cos\theta$ is in the denominator when solving for surface tension.

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