- 1(current)
Q. No.With a rise in temperature:
| 1. | surface tension of water decreases. |
| 2. | viscosity of water decreases. |
| 3. | viscosity of air decreases. |
| 4. | viscosity of air increases. |
Subtopic: Â Surface Tension |
 58%
Level 3: 35%-60%
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The surface tension of soapy water is \(S.\) When bubbles are blown with soapy water, one bubble of radius \(r\) is formed within another of radius \(3r.\) The excess pressure within the smaller bubble, relative to the atmospheric pressure is:
| 1. | \(\dfrac{4S}{r}\) | 2. | \(\dfrac{8S}{3r}\) |
| 3. | \(\dfrac{8S}{r}\) | 4. | \(\dfrac{16S}{3r}\) |
Subtopic: Â Surface Tension |
Level 3: 35%-60%
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When two drops of water coalesce:
| I: | total surface area decreases. |
| II: | there is some rise in the temperature. |
Which of the following is correct?
| 1. | Both (I) and (II) are wrong statements. |
| 2. | (I) is True but (II) is False. |
| 3. | Both (I) and (II) are True and the two statements are independent of each other. |
| 4. | Both (I) and (II) are True and (I) is the cause of (II). |
Subtopic: Â Surface Tension |
 57%
Level 3: 35%-60%
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A pair of soap bubbles cling together to form a double-bubble as shown: their respective radii are \(3R,R.\) The radius of their interface \((PQ)\) is:
| 1. | \(2R\) | 2. | \(5R\) |
| 3. | \(\dfrac{3R}{4}\) | 4. | \(\dfrac{3R}{2}\) |
Subtopic: Â Surface Tension |
 62%
Level 2: 60%+
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- 1(current)
Q. No.
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