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Work done in blowing a soap bubble to a larger size

This type of question, asked 6 times: 29 Jan 2023, 11 Apr 2023, 4 Apr 2024, 24 Jan 2026 S2, 2 Apr 2026 S2, 4 Apr 2026 S1. All 6 questions below, oldest first.

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  1. Question 1

    29 Jan 2023

    9
    Surface tension of a soap bubble is 2.0×10−2Nm−12.0 \times10^{- 2}Nm^{- 1}. Work done to increase the radius of soap bubble from 3.5 cmcm to 7 cm7\text{ }cm will be: Take [π=227]\left\lbrack \pi =\frac{22}{7} \right\rbrack

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  2. Question 2

    11 Apr 2023

    119
    The surface tension of soap solution is 3.5×10−23.5 \times10^{- 2} Nm−1Nm^{- 1}. The amount of work done required to increase the radius of soap bubble from 10 cm10\text{ }cm to 20 cm20\text{ }cm___ is x×10−4 Jx \times10^{- 4}\text{ }J.

  3. Question 3

    4 Apr 2024

    26
    A soap bubble is blown to a diameter of 7 cm7\text{ }cm. 36960 erg of work is done in blowing it further. If surface tension of soap solution is 40 dyne/cm then the new radius is ____ cmcm. Take :(π=227):\left( \pi =\frac{22}{7} \right).

  4. Question 4

    24 Jan 2026 S2

    25
    A soap bubble of surface tension 0.04 N/m0.04\text{ }N/m is blown to a diameter of 7 cm. If (15000−x)μJ(15000 - x)\mu J of work is done in blowing it further to make its diameter 14 cm, then the value of x is ____\_\_\_\_ . ( π=22/7\pi = 22/7 )

  5. Question 5

    2 Apr 2026 S2

    8
    The surface tension of a soap bubble is 0.03 N/m0.03\text{ }N/m. The work done in increasing the diameter of bubble from 2 cm to 6 cm is απ×10−4 J\alpha\pi\times10^{- 4}\text{ }J. The value of α\alpha is ____\_\_\_\_ . (Take π=3.14\pi= 3.14 )

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  6. Question 6

    4 Apr 2026 S1

    22
    The surface tension of a soap solution is 3.5×10−2 N/m3.5 \times 10^{- 2}\text{ }N/m. The work required to increase the radius of a soap bubble from 1 cm to 2 cm is α×10−6 J\alpha \times 10^{- 6}\text{ }J. The value of α\alpha is ____\_\_\_\_ . (π=22/7)(\pi = 22/7)