The amount of energy required to form a soap bubble of radius $$2~\text{cm}$$ from a soap solution is nearly:
$$($$surface tension of soap solution $$0.03~\text{Nm}^{-1})$$
1. $$50.1 \times 10^{-4}~\text{J}$$
2. $$30.16 \times 10^{-4}~ \text{J}$$
3. $$5.06 \times 10^{-4} ~\text{J}$$
4. $$3.01\times 10^{-4} ~\text{J}$$
Subtopic:  Surface Tension |
58%
From NCERT
NEET - 2023
Hints

If a soap bubble expands, the pressure inside the bubble:
 1 is equal to the atmospheric pressure 2 decreases 3 increases 4 remains the same
Subtopic:  Surface Tension |
68%
From NCERT
NEET - 2022
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

Air is pushed carefully into a soap bubble of radius $$r$$ to double its radius. If the surface tension of the soap solution is $$T,$$ then work done in the process is:

 1 $$12\pi r^2T$$ 2 $$24\pi r^2T$$ 3 $$4\pi r^2T$$ 4 $$8\pi r^2T$$
Subtopic:  Surface Tension |
60%
From NCERT
NEET - 2022
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NEET 2023 - Target Batch - Aryan Raj Singh

A liquid does not wet the solid surface if the angle of contact is:
1. equal to $$45^{\circ}$$
2. equal to $$60^{\circ}$$
3. greater then $$90^{\circ}$$
4. zero

Subtopic:  Surface Tension |
77%
From NCERT
NEET - 2020
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

A soap bubble, having a radius of $$1~\text{mm}$$, is blown from a detergent solution having a surface tension of$$2.5\times 10^{-2}~\text{N/m}$$. The pressure inside the bubble equals at a point $$Z_0$$ below the free surface of the water in a container. Taking $$g = 10~\text{m/s}^{2}$$${}^{}$, the density of water $$= 10^{3}~\text{kg/m}^3$$${}^{}$, the value of $$Z_0$$ is:

 1 $$0.5~\text{cm}$$ 2 $$100~\text{cm}$$ 3 $$10~\text{cm}$$ 4 $$1~\text{cm}$$
Subtopic:  Surface Tension |
55%
From NCERT
NEET - 2019
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

A rectangular film of liquid is extended from $$(4~\text{cm} \times 2~\text{cm})$$ to $$(5~\text{cm} \times 4~\text{cm}).$$ If the work done is $$3\times 10^{-4}$$ J, the value of the surface tension of the liquid is:
1. $$0.250$$ Nm–1
2. $$0.125$$ Nm–1
3. $$0.2$$ Nm–1
4. $$8.0$$ Nm–1

Subtopic:  Surface Tension |
70%
From NCERT
NEET - 2016
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

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:

 1 energy $$= 4{VT}\left( \frac{1}{{r}} - \frac{1}{{R}}\right)$$ is released. 2 energy $$={ 3{VT}\left( \frac{1}{{r}} + \frac{1}{{R}}\right)}$$ is released. 3 energy $$={ 3{VT}\left( \frac{1}{{r}} - \frac{1}{{R}}\right)}$$ is released. 4 energy is neither released nor absorbed.

Subtopic:  Surface Tension |
72%
From NCERT
AIPMT - 2014
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NEET 2023 - Target Batch - Aryan Raj Singh

The wettability of a surface by a liquid depends primarily on:
 1 surface tension. 2 density. 3 angle of contact between the surface and the liquid. 4 viscosity.
Subtopic:  Surface Tension |
85%
From NCERT
AIPMT - 2013
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NEET 2023 - Target Batch - Aryan Raj Singh
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