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Q. No.

The angle of contact at the interface of the water glass is \(0^{\circ},\) ethyl-alcohol glass is \(0^{\circ},\) mercury-glass is \(140^{\circ}\) and methyl iodide-glass is \(30^{\circ}.\) A glass capillary is put in a trough containing one of these four liquids is observed that the meniscus is convex. The liquid in the trough is:
1. water
2. ethyl alcohol
3. mercury
4. methyl iodide

Subtopic:  Capillary Rise |
 82%
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The angles of contact between the capillary tubes and three liquids in three containers \(A\), \(B\), and \(C\) are \(30^\circ,\) \(90^\circ\) and \(120^\circ\) respectively. The level of liquid inside the capillary tubes in containers:
1. falls in \(B\) and rises in \(C\)
2. rises in \(A\) and neither rises nor falls in \(B\)
3. falls in \(C\) and rises in \(B\)
4. falls in \(A\) and neither rises nor falls in \(B\)
 
Subtopic:  Capillary Rise |
 69%
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In a vertical capillary of height \(3h,\) water rises upto height \(h.\) If the capillary is tilted at \(30^\circ\) with horizontal, then the height upto which water will rise becomes:
1. \(3h\)
2. \(2h\)
3.  \(h\)
4. \(\dfrac {3h} 2\)
Subtopic:  Capillary Rise |
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In a surface tension experiment with a capillary tube, the water rises upto height \(h.\) Choose the correct statement from the following options:
1. In a lift moving upward with acceleration, height is less than \(h.\)
2. In a lift moving downward with acceleration, height is more than \(h.\)
3. On the surface of the moon with acceleration \( (\leq g),\) the height is more than \(h.\)
4. All of the above are correct.
Subtopic:  Capillary Rise |
 85%
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A long capillary tube of radius \(1\) mm open at both ends is filled with water and placed vertically. What will be the height of the column of water left in capillary? The thickness of the capillary walls is negligible. Surface tension of water is \(70\) dyne/cm
1. \(2.5\) cm 2. \(2.8\) cm
3. \(3.0\) cm 4. \(3.2\) cm
Subtopic:  Capillary Rise |
 83%
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Given below are two statements: 
Assertion (A): The water rises higher in a capillary tube of small diameter than in a capillary tube of large diameter.
Reason (R): The height through which liquid rises in a capillary tube is inversely proportional to the diameter of the capillary tube.
 
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.
Subtopic:  Capillary Rise |
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A capillary tube of radius \(0.20\) mm is dipped vertically in the water. The height of the water column raised in the tube will be:
(Surface tension of water\(=0.075\) N/m and density of water \(=1000\) kg/m3. Take \(g=10\) m/s2 and contact angle \(0^\circ.\))
1. \(7.5\) cm
2. \(6\) cm
3. \(5\) cm 
4. \(3\) cm

Subtopic:  Capillary Rise |
 88%
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A \(\text{U}\text-\)tube with limbs of diameters \(5~\text{mm}\) and \(2~\text{mm}\) contains water of surface tension \({7}\times{10}^{{-}{2}}~\text{N/m}\), angle of contact \(0^{\circ}\) and density \(10^{3}~\text{kg/m}^3\). If \(g\) is \(10~\text{m/s}^2\), then the difference in levels in the two limbs is: (Given: Initially water level in both the limbs is the same and in metres)
1. \(8.4~\text{mm}\) 2. \(8.4~\text{cm}\)
3. \(8.4~\text{m}\) 4. \(0.84~\text{mm}\)
Subtopic:  Capillary Rise |
 73%
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A capillary tube of radius \(r\) is immersed in water and water rises in it to a height \(h.\) The mass of the water in the capillary is \(5\) g. Another capillary tube of radius \(2r\) is immersed in water. The mass of water that will rise in this tube is:

1. \(5.0\) g 2. \(10.0\) g
3. \(20.0\) g 4. \(2.5\) g
Subtopic:  Capillary Rise |
 62%
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