The surface tension of a liquid is \(5\) N m-1. If a film is held on a ring of area \(0.02\) , then its total surface energy is:
1. \(3\times\) J
2. \(2\times\) J
3. \(3\times\) J
4. J
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. | \(\theta=180^\circ\) |
The relative velocity of two adjacent layers of a liquid is 6 cm/s and the perpendicular distance between layers is 0.1 mm. The velocity gradient for liquid (in per second) is:
1. | 6 | 2. | 0.6 |
3. | 0.06 | 4. | 600 |
A large open tank with a square hole of side \(0.1\) cm in the wall at a depth of \(0.2\) m from the top is completely filled with a liquid. The rate of flow of liquid (in /s) through the hole will be:
1. | \(1\) | 2. | \(2\) |
3. | \(3\) | 4. | \(4\) |
The property of surface tension of the liquid is due to:
1. | the gravitational force of attraction between the molecules. |
2. | the cohesive forces between the molecules. |
3. | the adhesive force between the molecules. |
4. | the formation of ionic bonds between the molecules. |
When a man sits on a boat of length 2 m and breadth 1 m floating on a lake, the boat sinks by 2 cm. The mass of the man is:
1. 25 kg
2. 40 kg
3. 60 kg
4. 80 kg
If two iron balls when fully immersed in water experience thrust force in the ratio of 1:2, then the ratio of the masses of the balls will be:
1. 1: 1
2. 1: 2
3. 2: 1
4. 1: 4
There are four cylindrical vessels identical in dimensions. If these are filled with equal masses of four different liquids P, Q, R, and S such that their densities are , then pressure at the base of vessel will be:
1. | 2. | ||
3. | 4. | Data is insufficient to predict the relation |
The reading of a spring balance when a block is suspended from it in the air is 60 N. This reading is changed to 40 N when the block is submerged in water. The specific gravity of the block, therefore, must be:
1. 3
2. 2
3. 6
4. 3/2
A beaker full of water is placed on a spring balance. If we put our finger in water without touching the beaker, how will the reading of the balance change? [Take ]
1. Increase
2. Decrease
3. Remain the same
4. Will be halved