NEET PYQs for Surface Tension with Solutions: Practice NEET Previous Year Questions

Updated 3+ months ago

Surface Tension is an important topic in the Physics section in NEET exam. Practising this topic will increase your score overall and make your conceptual grip on NEET exam stronger.

This article gives you a full set of NEET PYQs for Surface Tension with explanations for effective preparation. Practice of NEET Physics PYQs including Surface Tension questions regularly will improve accuracy, speed, and confidence in the NEET 2026 exam.

NEET PYQs for Surface Tension with Solutions

1.
A glass capillary tube of internal radius $r=0.25\, mm$ is immersed in water. The top end of the tube projected by $2\, cm$ above the surface of the water. At what angle does the liquid meet the tube? Surface tension of water $=0.7\, N / m$.
- $\theta = 90^{\circ}$
- $\theta = 70^{\circ}$
- $\theta = 45^{\circ}$
- $\theta = 35^{\circ}$
View Solution
2.
Three liquids of densities having the same value of surface tension $T$, rise to the same height in three identical capillaries. The angles of contact $\theta_{1}, \theta_{2}$ and $\theta_{3}$ obey-
- $\frac{\pi}{2} > \theta_1 > \theta_2 > \theta_3 \geq 0 $
- $0 \leq \theta_1 < \theta_2 < \theta_3 < \frac{\pi}{2}$
- $\frac{\pi}{2} < \theta_1 < \theta_2 < \theta_3 < \pi$
- $\pi > \theta_1 > \theta_2 > \theta_3 > \frac{\pi}{2}$
View Solution
3.
A thin flat circular disc of radius 4.5 cm is placed gently over the surface of water. If surface tension of water is 0.07 Nm^-1, then the excess force required to take it away from the surface is :
- 19.8 mN
- 198 N
- 1.98 mN
- 99 N
View Solution
4.
A certain number of spherical drops of a liquid of radius 'r' coalesce to form a single drop of radius 'R' and volume 'V'. If 'T' is the surface tension of the liquid, then:
- energy = 3VT($\frac{1}{r}+\frac{1}{R}$) is absorbed.
- energy = 3VT($\frac{1}{r}-\frac{1}{R}$) is released.
- energy is neither released nor absorbed.
- energy = 4VT($\frac{1}{r}-\frac{1}{R}$) is released.
View Solution
5.
A balloon is made of a material of surface tension S and has a small outlet. It is filled with air of density $ \rho $. Initially the balloon is a sphere of radius R. When the gas is allowed to flow out slowly at a constant rate, its radius shrinks as $ r(t) $. Assume that the pressure inside the balloon is $ P(r) $ and is more than the outside pressure ($ P_0 $) by an amount proportional to the surface tension and inversely proportional to the radius. The balloon bursts when its radius reaches $ r_0 $. Then the speed of gas coming out of the balloon at $ r = R $ is :
- $ \sqrt{\frac{S}{\rho R}} $
- $ \sqrt{\frac{2S}{\rho R}} $
- $ \sqrt{\frac{4S}{\rho R}} $
- $ \sqrt{\frac{S}{2\rho R}} $
View Solution
6.
The pair of quantities having same dimensions is
- Impulse and Surface Tension
- Angular momentum and Work
- Work and Torque
- Young's modulus and Energy
View Solution
7.
Consider a water tank shown in the figure. It has one wall at $x = L$ and can be taken to be very wide in the z direction. When filled with a liquid of surface tension $S$ and density $ \rho $, the liquid surface makes angle $ \theta_0 $ ($ \theta_0 < < 1 $) with the x-axis at $x = L$. If $y(x)$ is the height of the surface then the equation for $y(x)$ is: (take $g$ as the acceleration due to gravity)
- $ \frac{d^2 y}{dx^2} = \frac{\rho g}{S} y $
- $ \frac{d^2 y}{dx^2} = \sqrt{\frac{\rho g}{S}} y $
- $ \frac{d^2 y}{dx^2} = \sqrt{\frac{S}{\rho g}} y $
- $ \frac{d^2 y}{dx^2} = \frac{S}{\rho g} y $
View Solution
8.
The wettability of a surface by a liquid depends primarily on
- angle of contact between the surface and the liquid
- viscosity
- surface tension
- density
View Solution
9.
A soap bubble, having radius of $1 mm$, is blown from a detergent solution having a surface tension of $2.5 \times 10^{-2} $$\frac Nm$. The pressure inside the bubble equals at a point $Z_0$ below the free surface of water in a container. Taking $g=10 m/s^2,$ density of water-$103 kg/m^3$, the value of $Z_0$ is:
- $100 cm$
- $10 cm$
- $1 cm$
- $0.5 cm$
View Solution

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NEET PYQs for Surface Tension with Solutions

1.A glass capillary tube of internal radius $r=0.25\, mm$ is immersed in water. The top end of the tube projected by $2\, cm$ above the surface of the water. At what angle does the liquid meet the tube? Surface tension of water $=0.7\, N / m$.

2.Three liquids of densities having the same value of surface tension $T$, rise to the same height in three identical capillaries. The angles of contact $\theta_{1}, \theta_{2}$ and $\theta_{3}$ obey-

3.A thin flat circular disc of radius 4.5 cm is placed gently over the surface of water. If surface tension of water is 0.07 Nm-1, then the excess force required to take it away from the surface is :

4.A certain number of spherical drops of a liquid of radius 'r' coalesce to form a single drop of radius 'R' and volume 'V'. If 'T' is the surface tension of the liquid, then:

6.The pair of quantities having same dimensions is

8.The wettability of a surface by a liquid depends primarily on

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1.
A glass capillary tube of internal radius $r=0.25\, mm$ is immersed in water. The top end of the tube projected by $2\, cm$ above the surface of the water. At what angle does the liquid meet the tube? Surface tension of water $=0.7\, N / m$.

2.
Three liquids of densities having the same value of surface tension $T$, rise to the same height in three identical capillaries. The angles of contact $\theta_{1}, \theta_{2}$ and $\theta_{3}$ obey-

3.
A thin flat circular disc of radius 4.5 cm is placed gently over the surface of water. If surface tension of water is 0.07 Nm^-1, then the excess force required to take it away from the surface is :

4.
A certain number of spherical drops of a liquid of radius 'r' coalesce to form a single drop of radius 'R' and volume 'V'. If 'T' is the surface tension of the liquid, then:

6.
The pair of quantities having same dimensions is

8.
The wettability of a surface by a liquid depends primarily on