AP EAPCET 2025 - 23rd May Morning Shift | Fluid Mechanics Question 7 | Physics

A mercury drop of radius 1 cm is divided into $10^6$ droplets of equal size. If surface tension of mercury is $35 \times 10^{-3} \mathrm{Nm}^{-1}$, then the change in surface energy in the process is

$8712 \mu \mathrm{~J}$

8712 erg

$4356 \mu \mathrm{~J}$

4356 erg

AP EAPCET 2025 - 22nd May Evening Shift

MCQ (Single Correct Answer)

-0

An aeroplane of mass $4.5 \times 10^4 \mathrm{~kg}$ and total wing area of $600 \mathrm{~m}^2$ is travelling at a constant height. The pressure difference between the upper and lower surfaces of its wings is (Acceleration due to gravity $=10 \mathrm{~ms}^{-2}$ )

$500 \mathrm{Nm}^{-2}$

$825 \mathrm{Nm}^{-2}$

$600 \mathrm{Nm}^{-2}$

$750 \mathrm{Nm}^{-2}$

AP EAPCET 2025 - 22nd May Morning Shift

MCQ (Single Correct Answer)

-0

In a hydraulic lift, if the radius of the smaller piston is 5 cm and the radius of the larger piston is 50 cm , then the weight that the larger piston can support when a force of 250 N is applied to the smaller piston is

50 kN

100 kN

40 kN

25 kN

AP EAPCET 2025 - 21st May Evening Shift

MCQ (Single Correct Answer)

-0

A liquid drop of diameter $D$ splits into 3375 small identical drops. If $S$ is the surface tension of the liquid, then the change in the surface energy in the process is

$44 D^2 S$

$44 \pi D^2 S$

$56 D^2 S$

$56 \pi D^2 S$

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