MHT CET 2025 23rd April Morning Shift | Fluid Mechanics Question 6 | Physics

A wind with speed $50 \mathrm{~m} / \mathrm{s}$ blows parallel to the roof of a house. The area of the roof is $300 \mathrm{~m}^2$. Assume that the pressure inside the house is atmospheric pressure. Density of air is $1.2 \mathrm{~kg} / \mathrm{m}^3$. The magnitude of the force exerted by the wind on the roof will be

$1.5 \times 10^5 \mathrm{~N}$

$3.0 \times 10^5 \mathrm{~N}$

$4.5 \times 10^5 \mathrm{~N}$

$9.0 \times 10^5 \mathrm{~N}$

MHT CET 2025 22nd April Evening Shift

MCQ (Single Correct Answer)

-0

The energy needed for breaking a liquid drop of radius ' $R$ ' into ' $n$ ' droplets each of radius ' $r$ ' is $[\mathrm{T}=$ surface tension of the liquid]

$\quad 4 \pi \mathrm{TR}^2\left[\frac{\mathrm{R}}{\mathrm{r}}+1\right]$

$\quad 4 \pi \mathrm{TR}^2\left[\frac{\mathrm{R}}{\mathrm{r}}-1\right]$

$\quad 4 \pi \mathrm{TR}^2\left[\frac{\mathrm{r}}{\mathrm{R}}+1\right]$

$\quad 4 \pi \operatorname{Tr}^2\left[\frac{\mathrm{R}}{\mathrm{r}}-1\right]$

MHT CET 2025 22nd April Evening Shift

MCQ (Single Correct Answer)

-0

The excess pressure inside a soap bubble is 1.5 times the excess pressure inside a second soap bubble. The volume of the second bubble is ' $x$ ' times the volume of the first bubble. The value of ' x ' is

$\frac{3}{2}$

$\frac{9}{4}$

$\frac{8}{27}$

$\frac{27}{8}$

MHT CET 2025 22nd April Evening Shift

MCQ (Single Correct Answer)

-0

Water rises in a capillary tube of radius r upto ${ }^2$ height h . The mass of water in a capillary is m. The mass of water that will rise in capillary of radius $\frac{\mathrm{r}}{5}$ will be

$\frac{\mathrm{m}}{5}$

$\frac{\mathrm{m}}{2}$

$\frac{111}{25}$

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