MHT CET 2026 17th April Morning Shift | Fluid Mechanics Question 23 | Physics

In a capillary tube of area of cross-section '$a$' water rises to height '$h$'. To what height will water rise in a capillary tube of area of cross-section $4a$?

$\dfrac{h}{4}$

$\dfrac{h}{2}$

$2h$

$4h$

MHT CET 2026 17th April Morning Shift

MCQ (Single Correct Answer)

-0

A soap bubble of radius $\dfrac{1}{\sqrt{\pi}}$ cm is expanded to radius $\dfrac{3}{\sqrt{\pi}}$ cm. Surface tension of soap solution is 25 dyne/cm. The work done during expansion in erg is

$800$

$1200$

$1600$

$2400$

MHT CET 2026 16th April Evening Shift

MCQ (Single Correct Answer)

-0

One thousand small water drops of equal radii combine to form a big drop. The ratio of final surface energy to the total initial surface energy is

$1 : 1$

$1 : 10$

$1 : 100$

$1 : 1000$

MHT CET 2026 16th April Evening Shift

MCQ (Single Correct Answer)

-0

Under isothermal condition, two soap bubbles of radii $r_1$ and $r_2$ combine to form a single soap bubble of radius R. The surface tension of the soap solution is (P = outside pressure)

$\dfrac{P(R^3 - r_1^3 - r_2^3)}{4(r_1^2 + r_2^2 - R^2)}$

$\dfrac{P(R^3 + r_1^3 + r_2^3)}{2(r_1^2 - r_2^2 + R^2)}$

$\dfrac{P(r_1^3 - r_2^3 - R^3)}{(R^2 + r^2 + r^2)}$

$\dfrac{P(R^3 - r_1^3 + r_2^3)}{2(r_1^2 + r_2^2 - R^2)}$

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