- 1(current)
Q. No.By the surface of a liquid, we mean:
| 1. | a geometrical plane like \(x = 0\) |
| 2. | all molecules exposed to the atmosphere |
| 3. | a layer of thickness of the order of \(10^{-8}~\text m\) |
| 4. | a layer of thickness of the order of \(10^{-4}~\text m\) |
An ice cube is suspended in a vacuum in a gravity-free hall. As the ice melts it,
| 1. | will retain its cubical shape. |
| 2. | will change its shape to spherical. |
| 3. | will fall down on the floor of the hall. |
| 4. | will fly up. |
When water droplets merge to form a bigger drop:
| 1. | energy is liberated. |
| 2. | energy is absorbed. |
| 3. | energy is neither liberated nor absorbed. |
| 4. | energy may either be liberated or absorbed depending on the nature of the liquid. |
Air is pushed into a soap bubble of radius r to double its radius. If the surface tension of the soap solution is S, the work done in the process is
1. 8 \(\pi\) r2 S
2. 12 \(\pi\) r2 S
3. 16 \(\pi\) r2 S
4. 24 \(\pi\) r2 S
If two soap bubbles of different radii are connected by a tube,
| 1. | air flows from bigger bubble to the smaller bubble till the sizes become equal. |
| 2. | air flows from bigger bubble to the smaller bubble till the sizes are interchanged. |
| 3. | air flows from the smaller bubble to the bigger. |
| 4. | there is no flow of air. |
The contact angle between a solid and a liquid is a property of:
| (a) | the material of the solid |
| (b) | the material of the liquid |
| (c) | the shape of the solid |
| (d) | the mass of the solid |
Choose the correct option from the given ones:
1. (a) and (b) only
2. (b) and (c) only
3. (c) and (d) only
4. All of these
A liquid is contained in a vertical tube of semicircular cross-section (figure). The contact angle is zero. The forces of surface tension on the curved part and on the flat part are in ratio:
1. \(1:1\)
2. \(1:2\)
3. \(\pi:2\)
4. \(2: \pi\)
- 1(current)
Q. No.
© 2025 GoodEd Technologies Pvt. Ltd.