A block of ice floats on a liquid of density 1.2 in a beaker. The level of liquid when ice completely melts-
1. Remains same
2. Rises
3. Lowers
4. (1), (2) or (3)
In order to float a ring of area 0.04 in a liquid of surface tension 75 N/m, the required surface energy will be:
1. | 3 J | 2. | 6.5 J |
3. | 1.5 J | 4. | 4 J |
If pressure at half the depth of a lake is equal to 2/3rd the pressure at the bottom of the lake, then the depth of the lake is:
1. | 10 m | 2. | 20 m |
3. | 60 m | 4. | 30 m |
A spherical drop of water has a radius of 1 mm. If the surface tension of water is N/m, the difference in pressures inside and outside the spherical drop is:
1. | 35 N / m2 | 2. | 70 N / m2 |
3. | 140 N / m2 | 4. | Zero |
In a capillary tube, pressure below the curved surface of the water will be:
1. | equal to atmospheric pressure. |
2. | equal to upper side pressure. |
3. | more than upper side pressure. |
4. | lesser than upper side pressure. |
If the excess pressure inside a soap bubble is balanced by an oil column of height of \(2\) mm, then the surface tension of the soap solution will be: (radius of the soap bubble, \(r=1\) cm and density of oil, \(d=0.8\) gm/cm3)
1. \(3.9\) N/m
2.
3.
4. \(3.9\) dyne/m
If the surface tension of water is \(0.06\) N/m2, then the capillary rise in a tube of diameter \(1\) mm is: \((\theta = 0^{\circ})\)
1. \(1.22\)m
2. \(2.44\)cm
3. \(3.12\)cm
4. \(3.86\) cm
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 |
An ideal fluid is flowing in a steady-state from section \(A\) to \(B\) through a pipe in a vertical plane as shown. Select the incorrect statement.
1. | Total energy per unit volume is the same at both sections A and B. |
2. | The incoming flow rate at A is equal to the outgoing flow rate at B. |
3. | Loss in kinetic energy of the fluid is equal to gain in potential energy from section A to section B. |
4. | The flow of fluid from A to B is laminar flow. |
If a small drop of water falls from rest through a large height h in air, then the final velocity is:
1. | \(\propto \sqrt{\mathrm{h}}\) |
2. | \(\propto \mathrm{h} \) |
3. | \(\propto(1 / h)\) |
4. | Almost independent of h |