JEE Main 2025 (Online) 24th January Morning Shift | Properties of Matter Question 24 | Physics

An air bubble of radius 0.1 cm lies at a depth of 20 cm below the free surface of a liquid of density $1000 \mathrm{~kg} / \mathrm{m}^3$. If the pressure inside the bubble is $2100 \mathrm{~N} / \mathrm{m}^2$ greater than the atmospheric pressure, then the surface tension of the liquid in SI unit is (use $g=10 \mathrm{~m} / \mathrm{s}^2$ )

0.02

0.05

0.25

0.1

JEE Main 2025 (Online) 24th January Morning Shift

MCQ (Single Correct Answer)

-1

The amount of work done to break a big water drop of radius ' $R$ ' into 27 small drops of equal radius is 10 J . The work done required to break the same big drop into 64 small drops of equal radius will be

20 J

10 J

5 J

15 J

JEE Main 2025 (Online) 23rd January Evening Shift

MCQ (Single Correct Answer)

-1

A massless spring gets elongated by amount $x_1$ under a tension of 5 N . Its elongation is $x_2$ under the tension of 7 N . For the elongation of $\left(5 x_1-2 x_2\right)$, the tension in the spring will be,

20 N

39 N

11 N

15 N

JEE Main 2025 (Online) 23rd January Evening Shift

MCQ (Single Correct Answer)

-1

Water flows in a horizontal pipe whose one end is closed with a valve. The reading of the pressure gauge attached to the pipe is $P_1$. The reading of the pressure gauge falls to $P_2$ when the valve is opened. The speed of water flowing in the pipe is proportional to

$\left(P_1-P_2\right)^2$

$\sqrt{\mathrm{P}_1-\mathrm{P}_2}$

$P_1-P_2$

$\left(P_1-P_2\right)^4$

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