The ratio of surface tensions of mercury and water is given to be 7.5 while the ratio of their densities is 13.6. Their contact angles with glass are close to 135° and 0°, respectively. It is observed that mercury gets depressed by an amount h in a capillary tube of radius , while water rises by the same amount h in a capillary tube of radius ½. The ratio (4 / ½ ), is then close to (a) 3/5 (b) 2/3 (c) 2/5 (d) 4/5
The ratio of surface tensions of mercury and water is given to be 7.5 while the ratio of their densities is 13.6. Their contact angles with glass are close to 135° and 0°, respectively. It is observed that mercury gets depressed by an amount h in a capillary tube of radius , while water rises by the same amount h in a capillary tube of radius ½. The ratio (4 / ½ ), is then close to (a) 3/5 (b) 2/3 (c) 2/5 (d) 4/5
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Transcribed Image Text:Objective Questions I (Only one correct option)
1 The ratio of surface tensions of mercury and water is given to
be 7.5 while the ratio of their densities is 13.6. Their contact
angles with glass are close to 135° and 0°, respectively. It is
observed that mercury gets depressed by an amount h in a
capillary tube of radius ½, while water rises by the same
amount h in a capillary tube of radius 2. The ratio (n / ½ ), is
then close to
12
(a) 3/5
(b) 2/3
(c) 2/5
(d) 4/5
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