Q. No.Which of the following graphs best represents the variation of capillary rise of a liquid with the radius of the capillary tube?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
If the surface tension of water is \(0.06~\text{N/m}^2,\) then the capillary rise in a tube of diameter \(1~\text{mm}\) is:
\((\theta = 0^{\circ})\)
1. \(1.22~\text {m}\)
2. \(2.44~\text {cm}\)
3. \(3.12~\text {cm}\)
4. \(3.86~\text {cm}\)
The wettability of a surface by a liquid depends primarily on:
| 1. | viscosity |
| 2. | surface tension |
| 3. | density |
| 4. | angle of contact between the surface and the liquid |
Water rises to height h in a capillary tube. If the length of the capillary tube above the surface of water is made less than h, then:
| 1. | water does not rise at all. |
| 2. | water rises up to the top of the capillary tube, then starts overflowing like a fountain. |
| 3. | water rises up to the top of the capillary tube and stays there without overflowing. |
| 4. | water rises up to a point a little below the top and stays there. |
A liquid filled in a container has a plane meniscus. If is the angle of contact, then:
| 1. | \(\theta=0^\circ\) | 2. | \(\theta=90^\circ\) |
| 3. | \(\theta<0^\circ\) | 4. | \(\theta=180^\circ\) |
If a capillary tube is partially dipped vertically into liquid and the levels of the liquid inside and outside are the same, then the angle of contact is:
| 1. | \(90^\circ\) | 2. | \(30^\circ\) |
| 3. | \(45^\circ\) | 4. | \(0^\circ\) |
Water rises to a height \(\mathrm{h}\) in a capillary at the surface of earth. On the surface of the moon, the height of water column in the same capillary will be:
1. \(\mathrm{6h}\)
2.
3. \(\mathrm{h}\)
4. \(\mathrm{zero}\)
| Assertion (A): | When height of a tube is less than liquid rise in the capillary tube, the liquid does not overflow. |
| Reason (R): | Product of radius of meniscus and height of liquid in capillary tube always remains constant. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
If the capillary experiment is performed in a vacuum, then for a liquid the capillary will:
| 1. | rise | 2. | remain the same |
| 3. | fall | 4. | rise to the top |
Three liquids of densities (with ), having the same value of surface tension T, rise to the same height in three identical capillaries. The angles of contact obey:
| 1. | \(\frac{\pi}{2}>\theta_1>\theta_2>\theta_3 \geq 0\) |
| 2. | \(0 \leq \theta_1<\theta_2<\theta_3<\frac{\pi}{2}\) |
| 3. | \(\frac{\pi}{2}<\theta_1<\theta_2<\theta_3<\pi\) |
| 4. | \(\pi>\theta_1>\theta_2>\theta_3>\frac{\pi}{2}\) |
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