MHT CET 2026 11th April Evening Shift | Fluid Mechanics Question 43 | Physics

In a capillary tube of radius 'R', a straight thin metal wire of radius 'r' is inserted symmetrically and one end of the combination is dipped vertically in water such that lower end of the capillary and thin wire are at same level. If 'T' is the surface tension of water and '$\rho$' is the density of water then the rise of water in the capillary is

$\dfrac{T}{(R-r)\rho g}$

$\dfrac{2T}{(R-r)\rho g}$

$\dfrac{4T}{(R+r)\rho g}$

$\dfrac{T}{(R+r)\rho g}$

MHT CET 2026 11th April Evening Shift

MCQ (Single Correct Answer)

-0

Due to surface tension, the excess pressure inside a smaller drop is $9$ units. If $27$ smaller drops combine then excess pressure inside the bigger drop is

$3$ units

$9$ units

$18$ units

$6$ units

MHT CET 2026 11th April Morning Shift

MCQ (Single Correct Answer)

-0

Two rain drops of same radius '$r$' falling with same terminal velocity '$V$' merge and form bigger drop of radius '$R$'. The terminal velocity of big drop is

$\dfrac{VR^2}{r^2}$

$\dfrac{2VR}{r}$

$\dfrac{VR}{r}$

$Vr^2 / R^2$

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